Entries |
Document | Title | Date |
20080204706 | System For Distributed Measurement of the Curves of a Structure - The invention relates to a system for distributed or dispersed measurement of axial and bending deformations of a structure including at least one threadlike device ( | 08-28-2008 |
20080225267 | Optical Measurement Apparatus and Method - An optical measurement apparatus and method a method for performing modulation spectroscopy measurement of a sample comprising: delivering an incident probe beam to a sample at a known spot; modulating reflectance of the probe beam with a pump beam which periodically forms a pump beam spot on the sample coincident with the probe beam spot; and monitoring a reflected probe beam with a detector: wherein the incident probe and pump beams are collinear; and wherein the incident beams are directed to be collinear by reflecting a beam from a facet of an optical waveguide transmitting the other beam. | 09-18-2008 |
20080239282 | Method and system for simultaneous measurement of strain and temperature - A method and system for simultaneously measuring strain and temperature characteristics of an object involves the attachment to the object of a pair of optical fibers having different refractive indices, the fibers being connected together at least one end thereof, and directing laser light into at least one end of the fibers. The Brillouin frequency of each of the fibers is measure and the strain and temperature characteristics are calculated based on the coefficients of strain and temperature and the measured Brillouin frequencies of the fibers. | 10-02-2008 |
20080246945 | APPARATUS FOR QUANTIFYING SHEAR STRESS ON A FORMULATION COMPRISING BIOMOLECULES - The present invention relates to an apparatus for determining the shear sensitivity of particles in solutions and methods of determining the respective shear velocities or the respective shear stress. | 10-09-2008 |
20080291423 | OPTICAL FRINGE GENERATION MEMBER CONTROL APPARATUS AND METHOD THEREFOR - An optical fringe generation member control apparatus includes a detection unit configured to detect an optical fringe, and a control unit configured to control operation of a member on which the optical fringe is generated, based on a detection result by the detection unit. | 11-27-2008 |
20090066933 | SURFACE INSPECTION APPARATUS AND SURFACE INSPECTION METHOD FOR STRAINED SILICON WAFER - An image pickup device disposed in a predetermined position relative to a surface of a strained silicon wafer photographs the surface of the strained silicon wafer in a plurality of rotation angle positions on photographing conditions under which bright lines appearing on the surface of the strained silicon wafer can be photographed, in an environment where a light source device illuminates the surface of the strained silicon wafer which is rotating. A composite image in a predetermined angle position is generated from surface images of the strained silicon wafer in a plurality of rotation angle positions obtained by the image pickup device. | 03-12-2009 |
20090128801 | MEASUREMENT OF CONSTITUTIVE PROPERTIES OF A POWDER SUBJECT TO COMPRESSIVE AXIAL AND RADIAL LOADING, USING OPTICAL SENSING - A method and system for measuring radial strain on powder or other granular material while the powder is subject to compressive axial and radial loading. The powder is contained within a pliable sleeve. As pressure is applied to the powder, the sleeve changes diameter. An optical emitter emits a beam of light, which is intersected by the entire diameter of the sleeve. An optical sensor receives the intersected beam, and generates a response signal that indicates the diameter of the sleeve. This change in diameter can be related to a constitutive property such as strain. | 05-21-2009 |
20090168048 | Evaluation Method and Manufacturing Method of Light-Emitting Element Material, Manufacturing Method of Light-Emitting Element, and Light-Emitting Device And Electric Appliance Having Light-Emitting Element - The present invention provides an evaluation method for evaluating whether a light-emitting element material to be evaluated is suitable for a host material or a guest material. By carrying out a first step of measuring absorption intensity of a light-emitting element material and a second step of irradiating the light-emitting element material with light for a predetermined period of time, repeatedly; thereby a change in absorption intensity with time is evaluated so that whether the light-emitting material is suitable for a host material or a guest material can be distinguished. The light emitted to the light-emitting element material preferably has a wavelength component which is absorbed by a skeleton which contributes to excitation of the light-emitting element material. | 07-02-2009 |
20090219508 | SYSTEM AND METHOD FOR DETECTING LOCAL MECHANICAL STRESS IN INTEGREATED DEVICES - A method of detecting local mechanical stress in integrated devices is provided, the method comprising: enabling the detection of a photovoltage difference between a scan probe device and a surface portion of an integrated device, the scan probe device being configured to deflect in response to the photovoltage difference; measuring the deflection of the scan probe device in response to the photovoltage difference between the scan probe device and the surface portion of the integrated device; and calculating a local stress level within the integrated device by determining a local work function of the surface portion of the integrated device based upon the deflection of the scan probe device. | 09-03-2009 |
20090262331 | Crack detection system - A crack detection system and a method for detecting cracks in a loaded engineering structure are provided. The system and method include a light source coupled and optical fibres that are led through the structure. The optical fibres have diameters below 75 μm. The light source is coupled to the optical fibres. | 10-22-2009 |
20090303460 | Reinforcement Element With Sensor Fiber, Monitoring System, And Monitoring Method - A reinforcement element, comprises at least one sensor fiber adapted for strain measurements based on stimulated Brillouin scattering within said sensor fiber. Furthermore, a system for monitoring strain within a structure comprises a reinforcement element comprising at least one sensor fiber adapted for strain measurements based on stimulated Brillouin scattering within said sensor fiber, a pump laser for coupling in laser radiation of a pump frequency into said at least one sensor fiber, a Stokes laser for coupling in laser radiation of a Stokes laser radiation into said at least one sensor fiber, wherein the pump frequency and the Stokes frequency are different from one another and wherein the frequency difference between the pump and Stokes frequencies is within the range of acoustical phonons within said sensor fiber, a sensor adapted to obtain a stimulated Brillouin backscattering signal, and a network analyzer adapted for determining the complex transfer function of the sensor fiber to determine a spatially resolved strain measurement. | 12-10-2009 |
20100053598 | SURFACE DEFORMATION DETECTION - A method of detecting deformation in a substrate includes detecting one or more changes in one or more emission characteristics of at least one pair of plasmon-coupled nanoparticles associated with a substrate, where the substrate includes at least one pair of plasmon-coupled nanoparticles. An apparatus for deformation detection includes a detection unit for detecting one or more changes in one or more emission characteristics of at least one pair of plasmon-coupled nanoparticles associated with a substrate. | 03-04-2010 |
20100134782 | ELONGATE STRUCTURE CURVATURE SENSING DEVICE - A curvature sensing device | 06-03-2010 |
20110019178 | Method for post processing fiber optic strain measurement data - Distributed Strain Sensing (DSS) systems are used to measure strain using optical fibers functioning as linear sensors. Strain is measured along the fiber optic cable over large distances using a BOTDR (Brillouin Optical Time Domain Reflectometer) which is a Fiber Optic Strain Analyzer based on Brillouin technology. This measurement is popular in the Geotechnical field to monitor structural integrity of bridges, tunnels, mines etc. It is also popular in many industries including the Oil and Gas industry. The procedure involves recording strain data traces periodically to compare structural changes that may have developed over time. However, it is difficult to observe small changes from the raw data traces. This is due to the large number of data points and strain irregularities inherited in the fiber cable. This invention provides a simple and economical way to observe clearly very small strain changes acting on a structure. This is done by post processing the data traces with a low pass filter. The data traces are smoothed out and small strain differences can be easily observed and analyzed. | 01-27-2011 |
20110019179 | Self-Referenced Optical Fiber Sensor and Related Sensor Network - The general field of the invention is that of fiber-optic sensors comprising at least one measurement optical fiber having an optically pumped doped amplifying medium, the optical characteristics of which are sensitive to a physical quantity, the fiber having at least one Bragg grating. The fiber is designed so as to generate, in the amplifying medium, two optical waves having different optical frequencies that propagate in the same direction after reflection on the Bragg grating and are emitted by the amplifying medium, the two optical frequencies depending on the physical quantity. The two waves may be generated using either a birefringent polarization-maintaining fiber or a DBR (Distributed Bragg Reflector) laser cavity. Notably, this sensor may be used as a hydrophone. | 01-27-2011 |
20110051123 | OPTICAL FIBER SENSOR, PRESSURE SENSOR, END EFFECTOR AND SENSOR SIGNAL PROCESSOR - An FBG (Fiber Bragg Grating) sensor is equipped with a plurality of stress detection sensors made up from optical fibers in which gratings that reflect light of a specified wavelength are arrayed, and a stress direction converter that converts stresses applied from the exterior into stresses of a direction in which the gratings are arrayed, and which transmits the stresses to each of the gratings. Consequently, the stress direction converter can transmit stresses, which are applied from a body, to a plurality of gratings. | 03-03-2011 |
20110096321 | PRESSURE SENSOR - A pressure sensor ( | 04-28-2011 |
20110102765 | FIBER-OPTIC BASED THRUST LOAD MEASUREMENT SYSTEM - A fiber-optic based thrust load measurement system is coupled to a bearing housing. The measurement system includes at least one fiber optic sensor configured to detect one or more parameters related to the bearing housing. An optical coupler is configured to regulate light signals emitted from a light source and light signals reflected from the fiber optic sensor. A detector system is configured to receive light signals from the optical coupler. A processor is configured to receive an output from the detector system and to determine a thrust load on a thrust bearing based on the detected one or more parameters related to the bearing housing. | 05-05-2011 |
20110102766 | OPTICAL FIBER SENSOR, PRESSURE SENSOR, END EFFECTOR AND STRESS DETECTING METHOD USING THE SAME - In an FBG (Fiber Bragg Grating) sensor, a stress direction converter includes a flat portion to which stresses are applied from the exterior, and stress transmitting sections that are bridged from the flat portion to an optical fiber cable. An inclined portion of the optical fiber cable, through which reflected light reflected by gratings is transmitted, is disposed along an inclined section that makes up one of the stress transmitting sections. | 05-05-2011 |
20110102767 | LIGHTNING DETECTION - A device for detecting lightning currents in a wind turbine comprises an inductive loop ( | 05-05-2011 |
20110116075 | DEVICE FOR MONITORING THE CORRECT OPERATION OF A PLURALITY OF DEVICES, NOTABLY ACTUATORS - A monitoring device for monitoring a plurality of microactuators includes an optical fibre with a plurality of sensors, each sensor being placed close to a microactuator and having optical properties varying as a function of at least one environmental parameter, the monitoring device also including a polling device with at least one transmitter/receiver for a fibre optic network, and processing means capable of modulating the frequency of the optical signal transmitted by the transmitter to select the sensor close to a given microactuator, and of comparing the received optical signal with a template characteristic of the correct operation of the microactuator, and of generating a resultant signal, representative of the correct operation of the monitored microactuator. The invention has applications in the field of health monitoring of vehicles, notably of aircraft. | 05-19-2011 |
20110176125 | SYSTEM AND METHOD FOR MONITORING BENDING OF A FLEXIBLE RISER - A system and method for monitoring bending curvature of a flexible pipe structure, including at least one conduit configured to conform to a profile of a bend stiffener of a flexible pipe structure, and the at least one conduit including one or more sensors, wherein each sensor is configured for measuring a bending curvature of the bend stiffener. | 07-21-2011 |
20110205526 | FLEXIBLE FIBRE OPTIC DEFORMATION SENSOR SYSTEM AND METHOD - A cable for distributed fibre optic sensing comprising a flexible tape, an optical fibre suitable for Brillouin scattering measurement forming at least two lengths, and at least one free end of at least one length being connectable to a reading unit, wherein at least a section of the longitudinal length of the flexible tape is situated between at least a section of the two lengths such that the two lengths are in close proximity such that a temperature gradient between the two lengths is minimized, and wherein the section of the tape and the section of lengths can flex together. | 08-25-2011 |
20110249252 | FIBER OPTIC SECURITY MAT SYSTEM - A sensing device includes a first layer, a second layer, and an optical sensor. The first layer includes a first surface for supporting an associated load. The first layer transmits a strain to a second surface due to the associated load located on the first surface. The second layer is formed of a compliant material and provides substantially uniform support to the first layer and deflects due to the associated load. The optical sensor is positioned between the first and second layers and senses the strain due to the associated load. | 10-13-2011 |
20110267598 | OPTICAL SENSOR SYSTEM AND DETECTING METHOD FOR AN ENCLOSED SEMICONDUCTOR DEVICE MODULE - A sensor system and method for a power electronics module is discussed. The system comprises a optical fibre | 11-03-2011 |
20110292372 | WIND TURBINE BLADES STRAIN MEASURING SYSTEM DURING STATIC TESTS - A current transformer ( | 12-01-2011 |
20120002190 | ARRANGEMENT AND A METHOD FOR CONTROLLING A MEASUREMENT HEAD OF AN OPTICAL MEASUREMENT INSTRUMENT - An optical measurement instrument includes a measurement head and mechanical support elements arranged to support a sample well plate. The measurement head is moved towards the sample well plate and, after the measurement head has touched the sample well plate, the measurement head is moved backwards away from the sample well plate so as to provide a desired distance between the measurement head and the sample well plate. A sensor device is attached to the mechanical support elements and arranged detect a mechanical effect occurring in the mechanical support elements due to force directed by the measurement head to the sample well plate. Hence, the situation in which the measurement head touches the sample well plate can be detected without a need to provide the measurement head with a force sensor. This is advantageous because the measurement head can be a changeable module of the optical measurement instrument. | 01-05-2012 |
20120069324 | HIGH RESOLUTION LARGE DISPLACEMENT/CRACK SENSOR - A structural displacement sensor that includes an arched member having two ends, where each end is attached to a fastening member. In an embodiment of the invention, the fastening members are configured to be attached to a structure. Further, a strain gauge is attached to the arched member, and the strain gauge is operatively connected to a signal processing device. In an embodiment, the arched member and strain gauge are configured to measure a displacement of the structure based on the amount of strain detected on the strain gauge. | 03-22-2012 |
20120086934 | SLOW-LIGHT FIBER BRAGG GRATING SENSOR - In certain embodiments, an optical device and a method of use is provided. The optical device can include a fiber Bragg grating and a narrowband optical source. The narrowband optical source can be configured to generate light. A first portion of light can be transmitted along a first optical path extending along and through the length of the fiber Bragg grating at a group velocity. The light can have a wavelength at or in the vicinity of a wavelength at which one or more of the following quantities is at a maximum value: (a) the product of the group index spectrum and a square root of the power transmission spectrum, (b) the slope of a product of the group index spectrum and one minus the power transmission spectrum, and (c) the slope of a product of the group index spectrum and the power transmission spectrum. | 04-12-2012 |
20120099097 | SYSTEM AND METHOD FOR UNIFORM AND LOCALIZED WALL THICKNESS MEASUREMENT USING FIBER OPTIC SENSORS - A system and method are provided for determining wall thickness of a structure such as a metallic pressurized pipe. The system includes an optical fiber having a plurality of Fiber Bragg Gratings (FBGs), and a mounting for securing the FBGs over discrete portions of the exterior surface of the pipe such that strain in the pressurized pipe wall is transmitted to the FBGs. The system further includes a light source and a light sensor coupled to an end of the optical fiber. The light sensor converts light reflected back from the FBGs into electrical signals that a digital processor converts into strain measurements. The FBGs are mounted around portions of the pipe expected to have significant metal loss as well as portions of the pipe expected to have negligible metal loss. The method includes at least one of comparing relative strains at locations with negligible metal loss to those with significant metal loss to accurately determine the thickness of the wall with metal loss; compensating for temperature effects by considering relative strains at areas of the pipe with and without metal loss; and measuring axial strain on the pipe with one or more of the FBGs to correct for at least one of bending and torsion effects on hoop strain. | 04-26-2012 |
20120162635 | FIBER OPTIC MEASURING DEVICE AND METHOD - A measuring device including at least one optical fiber which contains a series of Bragg gratings distributed between first and second ends of the fiber. A light source is arranged to emit a luminous flux at multiple wavelengths incident on the first end of the fiber, and an instrument connected to the second end of the fiber measures the power of the light transmitted at each emitted wavelength, enabling implementation of the method. In the method the power of the light transmitted by the optical fiber in a spectrum including wavelengths is measured. | 06-28-2012 |
20120176597 | Strain and Temperature Discrimination Using Fiber Bragg Gratings in a Cross-Wire Configuration - A fiber Bragg grating cross-wire sensor may be used to independently determine strain and temperature variation. An example fiber Bragg grating cross-wire sensor comprises a first fiber Bragg grating (FBG) that reflects a first percentage, R | 07-12-2012 |
20120229793 | OPTICAL FIBER SENSORS HAVING LONG ACTIVE LENGTHS, SYSTEMS, AND METHODS - Optical fiber sensors adapted to measure strain or pressure are disclosed. The optical fiber sensor has a lead-in optical fiber having an end surface at a forward end, and a first optical element having a body with an outer dimension, Do, a front end surface coupled to the lead-in optical fiber, a pedestal including a retracted surface that is spaced from the front end surface, the retracted surface at least partially defining an optical cavity, a gutter surrounding the pedestal, the gutter having a gutter depth defining an active region of length, L, the first optical element further exhibiting L/Do≧0.5. Also provided are systems including the optical fiber sensor, and methods for manufacturing and using the optical fiber sensor. Numerous other aspects are provided. | 09-13-2012 |
20120229794 | Thin Film Stress Measurement 3D Anisotropic Volume - A system for measuring thin film stress (anisotropic or isotropic), such as from thin film deposition onto semiconductor substrates found in semiconductor manufacturing. The system uses resettled volume difference (V | 09-13-2012 |
20120250001 | STRESS MEASUREMENT DEVICE AND STRESS MEASUREMENT METHOD - A stress measurement device is arranged such that image processing is carried out with respect to each of a plurality of particles dispersed in an RP model to which light is emitted, movement directions and movement amounts of the respective plurality of particles in the RP model are found, and a three-dimensional stress occurring in the RP model is measured by use of a result of the finding. The stress measurement device includes: a retaining section which retains the RP model while soaking the RP model in a refractive index matching solution having a refractive index that matches a refractive index of the RP model; and a load application mechanism and a load application mechanism which apply a load to the RP model retained by the retaining section. | 10-04-2012 |
20120262702 | OPTICAL STRAIN GAUGE COMPRISING A FIBER BRAGG GRATING - The invention relates to an optical strain gauge using a glass fiber ( | 10-18-2012 |
20120274923 | OPTICAL STRAIN GAUGE - The invention relates to an optical strain gauge ( | 11-01-2012 |
20120314201 | TESTING METHODS FOR WIND TURBINE BLADES - Testing method for determining the distribution of a physical property along a wind turbine blade comprising the following steps: a) installing inside the blade a first optical fibre cable ( | 12-13-2012 |
20120327392 | SYSTEM AND METHOD FOR SENSING SHAPE OF ELONGATED INSTRUMENT - An instrument system that includes an elongate body and an optical fiber is provided. The elongate body includes a first elongate portion having a hollow lumen and a second elongate portion adjacent to the first elongate portion. The optical fiber is located in the lumen of the first elongate portion and in the second elongate portion. The optical fiber has a strain sensor provided thereon. The lumen is adapted to allow the optical fiber to move in the lumen relative to the elongate body, and the second elongate portion is adapted to prohibit all movement of the optical fiber relative to the elongate body. | 12-27-2012 |
20130083310 | FIBER OPTIC INSTRUMENT ORIENTATION SENSING SYSTEM AND METHOD - An instrument system that includes an image capture device, an elongate body, an optical fiber and a controller is provided. The elongate body is operatively coupled to the image capture device. The optical fiber is operatively coupled to the elongate body and has a strain sensor provided on the optical fiber. The controller is operatively coupled to the optical fiber and adapted to receive a signal from the strain sensor and to determine a position or orientation of the image capture device based on the signal. | 04-04-2013 |
20130094013 | Nested Binary Code Symbol - A non-linear strain gage includes a target for association with an object for which at least one of strain and fatigue damage is to be measured, a sensor, and a computer. The target incorporates a nested binary code symbol for perimeter-based deformation and strain analysis and emits a detectable physical quantity. The binary code symbol includes a boundary binary code symbol having a perimeter constructed of line segments and at least a core code symbol that provides encoded data. The core code symbol is nested within and concentric with the boundary binary code symbol. A method of measuring strain on an object directly using the non-linear strain gage is also provided. | 04-18-2013 |
20130188168 | FIBER OPTIC FORMATION DIMENSIONAL CHANGE MONITORING - Fiber optic monitoring of dimensional changes within a subterranean formation includes deploying a fiber optic cable assembly in a wellbore and attaching the cable assembly to first and second attachment points on either side of the formation. A surface fiber optic measurement system measures changes in the optical path length between the attachment points of the fiber optic cable assembly. The changes in optical path length are directly indicative of dimensional changes within the formation. | 07-25-2013 |
20130208259 | PARAMETER SENSING AND MONITORING - Apparatus and method for monitoring at least one parameter associated with an elongate structure are disclosed. The apparatus may include at least one elongate support body element arranged along a longitudinal structure axis associated with an elongate target structure; and at least one optic fibre element arranged substantially helically along a longitudinal body element axis associated with the at least one support body element. A method of manufacturing flexible pipe body is also disclosed. | 08-15-2013 |
20130265564 | OPTICAL STRAIN GAUGE - The invention relates to an optical strain gauge ( | 10-10-2013 |
20130278918 | LONG FIBRE OPTIC SENSOR SYSTEM IN A WIND TURBINE COMPONENT - A sensor system for measuring an operating parameter of a wind turbine component is described. The fibre optic sensor system comprises a light source for outputting light in a predetermined range of wavelengths, and an optical fibre comprising a long Fibre Bragg Grating, extending continuously over a length of the optical fibre to provide a continuous measurement region in the optical fibre. The optical fibre is coupled to the wind turbine component such that the continuous measurement region is located at a region of the wind turbine component to be sensed, and such that the grating period at each location in the continuous measurement period is dependent upon the value of the operating parameter at that location. A light detector receives light from the optical fibre, and provides an output signal to the controller indicating the intensity of the received light; based on the detected light, a value for the operating parameter is determined. | 10-24-2013 |
20130286378 | Strain Sensor Apparatus and Method of Strain Sensing - According to the present invention there is provided a strain sensor apparatus comprising, two or more strain sensors each of which is capable of measuring strain and each of which is configured such that it can be arranged to cooperate with a structure to be monitored so that strain in the structure can be detected by a strain sensor, and one or more position references which is/are arranged in a predetermined position relative to the two or more strain sensors and wherein the one or more position references are each configured such that they are suitable for cooperating with a measuring means; one or more measuring means which is configured to cooperate with the one or more position references so that the angular orientation of the one or more position references can be determined. There is further provided a corresponding method for sensing strain in a structure. | 10-31-2013 |
20130301031 | TEMPLATES FOR OPTICAL SHAPE SENSING CALIBRATION DURING CLINICAL USE - A medical device calibration apparatus, system and method include a calibration template ( | 11-14-2013 |
20130335727 | System And Method For Post-Tensioned Tendon Monitoring - A system and method for post-tensioned tendon monitoring includes at least one optical sensor arranged in monitoring proximity to a post-tensioned tendon, a test instrument in communication with the optical sensor, and a processor capable of managing operation of the test instrument, a storage device and a display. The system and method further include a database adapted to contain sensor baseline information and sensor measurement data. The test instrument is capable of sending a first wavelength to the optical sensor and receiving a second wavelength from the optical sensor, wherein at least one of the instrument or the processor is configured to analyze the second wavelength and output sensor measurement data for storage in the database. The processor is configured to calculate an amount of tensile loading which exists in the post-tensioned tendon, based on the sensor measurement data and the sensor baseline data, and to provide an output. | 12-19-2013 |
20140022529 | STRUCTURAL MATERIAL WITH EMBEDDED SENSORS - The structural material with embedded sensors provides of diagnostics and measurement of static and/or dynamic strains in structures and structural elements formed from the structural material. The structural material includes an array of fiber Bragg grating sensors or the like embedded therein for strain measurement and monitoring. An array of linear channels is formed in the structural element, and the plurality of fiber Bragg grating sensors are respectively disposed therein. The plurality of fiber Bragg grating sensors communicate with a signal analyzer, which receives the signals generated by the fiber Bragg grating sensors, the signals being representative of a magnitude of a strain placed on the to structural element. The signal analyzer may, in turn, transmit a conditioned signal to a computer or the like for presentation of strain data to the user. | 01-23-2014 |
20140092375 | MONITORING AND MANAGEMENT FOR ENERGY STORAGE DEVICES - A monitoring and management system (MMS) includes one or more fiber optic cables arranged within or on portions of an energy storage device. Each fiber optic cable includes multiple optical sensors. At least one of the optical sensors is configured to sense a parameter of the energy storage device that is different from a parameter of the energy storage device sensed by at least another optical sensor of the multiple optical sensors. The MMS includes a light source configured to provide light to the one or more fiber optic cables and a detector configured to detect light reflected by the optical sensors. The detector generates an electrical signal based on the reflected light. A processor is coupled to receive the electrical signal, to analyze the electrical signal, and to determine state of the energy storage device based on analysis of the electrical signal. | 04-03-2014 |
20140218716 | FLEXIBLE FIBRE OPTIC DEFORMATION SENSOR SYSTEM AND METHOD - A cable for distributed fibre optic sensing comprising a flexible tape, an optical fibre suitable for Brillouin scattering measurement forming at least two lengths, and at least one free end of at least one length being connectable to a reading unit, wherein at least a section of the longitudinal length of the flexible tape is situated between at least a section of the two lengths such that the two lengths are in close proximity such that a temperature gradient between the two lengths is minimized, and wherein the section of the tape and the section of lengths can flex together. | 08-07-2014 |
20140218717 | BOTDA System that Combined Optical Pulse Coding Techniques and Coherent Detection - A BOTDA system that combined optical pulse coding techniques and coherent detection includes a narrow linewidth laser, two polarization-maintaining couplers, microwave generator, two electro-optic modulators (EOMs), fiber under test, an optical circulator, a 3 dB coupler, a polarization scrambler, a pulse generator, a balance photodetector, an electrical spectrum analyzer, digital signal processing unit and a frequency shifter. The optical pulse coding techniques and coherent detection are simultaneously used in the invented system, which can be enhance the signal-to-noise ration (SNR), the measuring accuracy and the sensing distance of BOTDA. Moreover, the proposed system has the capacity of break interrogation. | 08-07-2014 |
20140268099 | Movement and Expression Sensor - A movement and expression sensor has a plurality of fiber Bragg gratings (FBG) disposed along the length of an optical fiber, and the optical fiber is placed in contact with a subject's skin surface. The sensors are interrogated for reflected wavelength, which is converted into a temperature or a strain. A series of such measurements can be made to determine the movement or position of the sensor location. A garment may be formed using the sensors and an elastomeric material, such that the sensors may be worn and removed, and the movements of the elastomer in the areas of sensors measured as a wavelength shift to characterize movement or estimate location. The elastomeric garment may be formed as a mask, or a sock, such as for use with a face, or foot. | 09-18-2014 |
20140268100 | Multiple Laser Time of Arrival Probe - A system and method for performing stress measurement on rotating parts is disclosed. The system may include a laser assembly configured to emit a plurality of laser beams having different wavelengths, and a probe assembly mounted proximal to a rotatable part in a device. The probe assembly may be configured to output a reflected laser beam onto a first target on the rotatable part. The probe assembly may be configured to output another reflected laser beam onto a second target on the rotatable part. The probe assembly may include a redirector, and a lens assembly mounted proximal to the redirector and configured to converge the laser beams. The redirector may be configured to change the direction of each emitted laser beam. | 09-18-2014 |
20140285793 | DISTRIBUTED STRAIN AND TEMPERATURE SENSING SYSTEM - A downhole optical sensing system can include an optical fiber positioned in the well, the optical fiber including multiple cores, and one of the cores having a Brillouin scattering coefficient which is different from another one of the cores. A method of sensing strain and temperature as distributed along an optical fiber can include measuring Brillouin scattering in a core of the optical fiber disposed in a well, and measuring Brillouin scattering in another core of the optical fiber disposed in the well, the optical fiber cores being exposed to a same strain and temperature distribution in the well. | 09-25-2014 |
20140354973 | Structural health monitoring method and apparatus based on optical fiber bend loss measurement - A fiber optic strain sensor, an optical pulse generator generates an initial optical pulse, and launches it into an optical fiber-optical strain probe chain through an optical circulator. The scattered optical power in the optical fiber and optical strain probe chain is sent to an optical receiver, also via the optical circulator. The optical strain probes are attached to a structure whose strain is to be measured. Strain in the structure causes the fiber bend loss to change in the strain probe, and causes the scattered optical power received by the optical receiver to change accordingly. From the change of the output of the optical receiver and the time required for the scattered optical power to travel from the probe, the strain at each of the probes is calculated. | 12-04-2014 |
20140354974 | Apparatus and Method for Monitoring the Mechanical Properties of Subsea Longitudinal Vertical Components in Offshore Drilling and Production Applications - An apparatus to monitor the loads and mechanical behavior of subsea longitudinal vertical components of off shore drilling and production platforms (SLVCs) uses sensors attached directly to the tendons by adhesive or by friction mount. The sensors are typically in a sensor ring assembly which is placed around the perimeter of the SLVC. Ruggedized cables carry the sensor reading from the ring assembly to the SLVC working platform and to a control center for monitoring the action and stresses on the tension legs. The system may be deployed on existing SLVCs or may be installed on new construction during initial assembly and installation. | 12-04-2014 |
20140354975 | Apparatus and Method for Measuring Mechanical Properties of Tendons in Tension Leg Platforms - An apparatus to monitor the loads and mechanical behavior of tendons for a tension leg platform (TLP) uses sensors attached directly to the tendons by adhesive of by friction mount. The sensors are typically in a sensor ring assembly which is placed around the perimeter of the tension leg. Ruggedized cables carry the sensor reading from the ring assembly to the TLP working platform and to a control center for monitoring the action and stresses on the tension legs. The system may be deployed on existing TLPs or may be installed on new construction before while on land. | 12-04-2014 |
20140368808 | Prism Coupling Methods With Improved Mode Spectrum Contrast for Double Ion-Exchanged Glass - Methods of capturing improved-contrast mode spectra of a double ion-exchanged (DIOX) glass sample using prism coupling of index n | 12-18-2014 |
20140375980 | FIBER SENSING SYSTEM BASED ON A BRAGG GRATING AND OPTICAL TIME DOMAIN REFLECTOMETRY - Optic fiber sensor characterized in that the sensing fiber is provided with a continuous Bragg grating covering the entire fiber length which is dedicated to sensing and along which spatially resolved measurements are performed. | 12-25-2014 |
20150077736 | SENSOR FOR COMBINED TEMPERATURE, PRESSURE, AND REFRACTIVE INDEX DETECTION | 03-19-2015 |
20150103332 | FRAME TRANSFER DEVICE FOR AN OPTICAL STRAIN GAUGE STRUCTURE - An optical strain gauge, a transfer device for an optical strain gauge, and a test system are described. One instance of the disclosed transfer device includes a first and second gauge coupler that facilitate attachment to an optical strain gauge. The disclosed transfer device enables an optical strain gauge to be easily moved from one location to another; for example from a location of manufacture, testing, or calibration, to an object to be tested with the strain gauge or from one object to another object. | 04-16-2015 |
20150103333 | APPARATUS FOR QUANTITATIVE MEASUREMENTS OF STRESS DISTRIBUTIONS FROM MECHANOLUMINESCENCE MATERIALS - An apparatus for measuring mechanoluminescent light includes a chamber defining an enclosure for a portion of a structure to be monitored and providing an opening fitted onto the structure. The structure has a mechanoluminescent material thereon. The apparatus further includes an imaging sensor positioned and configured to take images of the mechanoluminescent material and an electronic controller in wired or wireless communication with the imaging sensor, the electronic controller being capable of controlling the properties of the imaging sensor and processing the images of the mechanoluminescent material. | 04-16-2015 |
20150109607 | MULTI POINT, HIGH SENSITIVE TACTILE SENSING MODULE FOR ROBOTS AND DEVICES - The features of the system are: fiber optic cables (instead of human sensory receptor) and low cost CMOS or CCD image sensor (which can be found in a conventional webcam, camcorder, digital camera etc.) are used by pairing each pixel of the image sensor with corresponding fiber optic cable, which is assured to transfer all light beams to the processor on a single photo frame where the coordinates and the level of displacements are detected precisely by the aid of image processing techniques, in order to provide tactile sensing. The system can work with a computer or it can work individually with an electronically circuit that contains an independent processor. | 04-23-2015 |
20150116697 | FIBRE OPTIC TAUT WIRE - A taut cable with a fiber optic cable with Bragg diffusion gratings allows a suitable driver circuit to determine the shape of the taut cable at a large number of points along its length. This enables the total 3-dimensional shape of the taut cable to be estimated and from which the position of the vessel relative to a seabed weight attached to the taut cable can be inferred. | 04-30-2015 |
20150138531 | PULSE LASER GENERATOR AND OPTICAL FIBER SENSOR SYSTEM USING SAME - Disclosed are a pulse laser generator and an optical fiber sensor system using the same. The optical fiber sensor system includes a main optical coupler that receives pulse laser light generated from a pulse laser generator from a first input terminal, branches the light to first and second output terminals to output, and outputs, through a third output terminal, light input reversely from the first and second output terminals, a reference optical fiber that is connected to the first output terminal, a multi-point sensing optical fiber unit that is connected to the second output terminal, and in which optical fibers are connected in series or in parallel corresponding to a plurality of sensing points, an optical detection unit that is connected to the third output terminal, and a diagnosis processing unit that detects a change of the physical quantity for the sensing points from signals from the optical detection unit. | 05-21-2015 |
20150308908 | PRISM COUPLING METHODS WITH IMPROVED MODE SPECTRUM CONTRAST FOR DOUBLE ION-EXCHANGED GLASS - Methods of capturing improved-contrast mode spectra of a double ion-exchanged (DIOX) glass sample using prism coupling of index n | 10-29-2015 |
20150322769 | Well Conductor Strain Monitoring - A well conductor strain monitoring system is provided which includes a plurality of fiber optic Bragg grating sensors written onto a single optical fiber. Cable strands are wound around the optical fiber to form an armored cable protecting the fiber. The armored cable is further integrated into a strength cable to provide robustness. This strength cable is then wrapped around the conductor under tension and anchored at both ends. The cable is wound at a prescribed angle so as to have multiple wraps around the conductor. Once tensioned, the cable remains stationary against the conductor and holds a position. The strain gages are spaced along the optical fiber, such that the strain gages are oriented 90 degrees apart when the cable is wrapped about the conductor. This orientation supports the estimation of bending in any direction. | 11-12-2015 |
20150323312 | METHOD AND SYSTEM FOR SIMULTANEOUS MEASUREMENT OF STRAIN AND TEMPERATURE UTILIZING DUAL CORE FIBER - There is provided a system for measuring temperature and strain simultaneously utilizing Brillouin Scattering within an optical fiber. The system has a cladding, a first optical core within the cladding and a second optical core within the cladding and having a different refractive index profile and/or composition than the first core. Means to couple light into and out of said individual optical cores and/or from one optical core to the other within the fiber is provided along with means for calculating strain and temperature characteristics based on measured Brillouin frequencies for said optical cores. | 11-12-2015 |
20150323405 | A Method for Locally Resolved Pressure Measurement - A method and an apparatus for the locally resolved pressure measurement along a pressure region ( | 11-12-2015 |
20150338308 | PRISM-COUPLING SYSTEMS AND METHODS FOR CHARACTERIZING LARGE DEPTH-OF-LAYER WAVEGUIDES - Prism-coupling systems and methods for characterizing large depth-of-layer waveguides are disclosed. The systems and methods utilize a coupling prism having a coupling angle α having a maximum coupling angle α | 11-26-2015 |
20150362385 | OPTICAL MONITORING SYSTEM - A monitoring system ( | 12-17-2015 |
20160018286 | METHOD FOR MONITORING DEFORMATION OF A ROTATING ELEMENT VIA A MONITORING DEVICE EMPLOYING OPTICAL FIBRE, AND WIND TURBINE EQUIPPED WITH SUCH A DEVICE - In the field of monitoring the aging of parts subjected to a rotary movement and, more precisely, of monitoring the deformation to which a peripheral surface of a rotating part is possibly subject, an improved method is provided. The method includes: a step of emitting a light signal at a first end of an optical fibre at least one section of which runs between two points of the surface of the part; a step of measuring a characteristic of the light signal received at a second end of the optical fibre, the characteristic varying as a function of the length of the optical fibre between its ends; and a step of comparing the characteristic of the light signal to a reference signal. | 01-21-2016 |
20160025483 | PRE-FORMED OPTICAL MEANDER STRUCTURES FOR USE IN AN OPTICAL STRAIN GAUGE SYSTEM FOR MEASUING STRAIN, AND A METHOD - An optical fiber strain sensor system and method are provided that use pre-formed optical structures instead of optical fibers for measuring the strain, or stress, placed on a subject object. The use of pre-formed optical structures in the optical strain gauge system eliminates many of the limitations associated with the use of optical fibers. Because the optical structures are pre-formed structures, they can be made with very tight tolerances to ensure high measurement accuracy and repeatability. The pre-formed structures can be made in low to high volume at low cost and can be made of a variety of materials to ensure that the structures are suitable for use with the material of which the subject object is made. Also, the pre-formed structures can be made very compact while achieving higher sensitivity and exhibiting less optical loss than fiber. | 01-28-2016 |
20160033358 | Focused Focused Optical Configuration for NSMS Probes - A method for configuring a sensor of a non-interference stress management system is disclosed. The method may include determining a focal distance between a light transmitting fiber and a transmit lens, the focal distance configured to focus light from the transmit fiber to form a focused transmit beam, the transmit beam targeting a reflective structure. The method may further include positioning the light transmitting fiber and the transmit lens, wherein the light transmitting fiber and the transmit lens are separated by a transmit gap based on the focal distance and positioning a light receptive fiber and a receive lens to receive a focused reflected beam from the reflective structure, wherein the light receptive fiber is separated from the receive lens by a receive gap based on the focal distance. | 02-04-2016 |
20160061671 | SYSTEM AND METHOD FOR SELECTING PATH ACCORDING TO SELECTION CONDITIONS - An optical element stress aberration calculation system and method, where a stress distribution is obtained through a stress analysis and a light tracking technologies, and then a stress distribution generated by incident lights with different viewing angles is calculated, so that a stress aberration error is reduced. | 03-03-2016 |
20160102968 | APPARATUS AND METHOD FOR CURVATURE AND THIN FILM STRESS MEASUREMENT - Apparatus and method for curvature and thin film stress measurement are disclosed. The apparatus comprises two light sources and a detector. Two light beams from the two light sources with an angle are not parallel. The two light beams are collimated and projected onto a specimen with a pitch. The detector receives the light beams reflected from the specimen. The curvature of the specimen is calculated via a distance between spots of the light beams on the detector or a size variation of one of the spots. | 04-14-2016 |
20160178477 | PRISM-COUPLING SYSTEMS AND METHODS FOR CHARACTERIZING ION-EXCHANGED WAVEGUIDES WITH LARGE DEPTH-OF-LAYER | 06-23-2016 |
20160202044 | SOUND CONTROLLER FOR OPTICAL SHAPE SENSOR | 07-14-2016 |
20160252414 | SYSTEM AND METHOD FOR DYNAMIC EVENT BASED IP ADDRESSING | 09-01-2016 |