Patent application number | Description | Published |
20080212216 | Optical multipass cell for repeated passing of light through the same point - The present invention is a multipass unipoint optical cell used for the improved analysis of samples by transmission, reflection, Raman or fluorescence spectroscopy by the multiple reimaging of light through the same analysis point. The cell comprises two or more identical optical reimaging elements each consisting of two symmetrically opposing, identical, confocal, and coaxial parabolic reflective surfaces with the property to refocus any ray of light coming from the common focal point onto one of the parabolic surfaces, back to the same focal point by the other parabolic surface at an angle to the incoming ray. Two or more of these reimaging optical elements can be configured around the common focal point to form different multipass unipoint optical cell configurations, all the passes crossing in the analysis point where a sample is brought to interact with light, the effect of said interaction being enhanced in proportion to the number of passes. | 09-04-2008 |
20100201977 | OPTICAL MULTIPASS CELL FOR REPEATED PASSING OF LIGHT THROUGH THE SAME POINT - An optical reimaging element comprising: a first off-axis parabolic mirror having only the portion of the mirror surface below the first plane that passes through its focal point and is perpendicular to the axis of the first parabola associated with the first mirror, the portion of the first mirror being on the same side of the first plane as the vertex of the first parabola; a second off axis parabolic mirror identical to the first mirror also having only the portion of the mirror surface below the second plane that passes through its focal point and is perpendicular to the axis of the second parabola associated with the second mirror, the portion of the second mirror being on the same side of the second plane as the vertex of the second parabola; and the first and second mirrors being in optical communication with each other so that their first and second planes coincide and so that their parabolic mirror surfaces are symmetrically opposing, confocal, and coaxial thereby having the property that a ray of light coming from the common focal point of the parabolic mirrors and incident onto one of the parabolic mirrors reflects to the other parabolic mirror wherein it reflects back to the focal point, but at an angle with the direction in which it left the focal point. An optical reimaging element comprising: a material, the material comprising: a top face; a bottom face; a first side face; a second side face; a third side face; and where the first and second of the side faces are in the shape of two symmetrically opposing, confocal, and coaxial parabolic surfaces so that the common axis of the parabolic surfaces is parallel and midway between the top and bottom faces and the third side face is spherical with the center of curvature coincident with the common focal point of the parabolic surfaces so that any ray of light originating from the common focal point and directed to the element is incident normal to the third face, transmits into the element without changing direction, is incident on one of the parabolic surfaces, reflects by total internal reflection to the other of the two parabolic surfaces, is reflected again by total internal reflection to come at normal incidence to the third face, transmits out of the element without changing direction and returns to the common focal point at an angle to the direction in which it left the focal point. | 08-12-2010 |
Patent application number | Description | Published |
20140152456 | Failure Point Diagnostics in Cable Telemetry - Methods and systems for failure point diagnostics in cable telemetry at a wellsite. The methods involve providing a system includes a cable operatively coupling between a surface modem and a downhole modem that is operatively coupled to a downhole toolstring of one or more downhole tools via a toolbus. The methods further involve generating a plurality of test signals, sequentially applying the test signals across one or more test loops in the cable telemetry system, and generating a failure point alert when at least one of the test signals fails in at least one of the test loops. The failure point alert identifies which component of the cable telemetry system caused the test signal to fail. | 06-05-2014 |
20140152457 | Toolstring Communication in Cable Telemetry - Systems and methods for toolstring communication in cable telemetry. The methods involve positioning a cable telemetry system in a wellbore. The cable telemetry system can include a surface modem, a downhole toolstring of downhole tools, a downhole modem operatively coupled to the downhole toolstring, a cable operatively coupling between the surface modem and the downhole modem, and a surface data routing module that polls and trains the cable telemetry system. The methods also involve performing a pre-transmission poll of a rate requirement for the downhole toolstring and a telemetry type for the downhole modem, applying a training phase to establish a transmission link between the surface modem and the downhole modem, configuring data obtained by the downhole toolstring for an uplink via the transmission link, and transmitting the uplink via the transmission link. | 06-05-2014 |
20140152459 | Wellsite System and Method for Multiple Carrier Frequency, Half Duplex Cable Telemetry - Methods and systems for multiple carrier frequency, half duplex cable telemetry for a wellsite. The methods involve generating a first type of bi-directional message in a first propagation mode, generating a second type of bi-directional message in the first propagation mode and in a second propagation mode, transmitting over a cable operatively coupling a surface modem and a downhole modem the first and second types of bi-directional message sequentially in a plurality of time periods across a single frequency bandwidth, and separating each of the first and second types of bi-directional message from a most subsequently transmitted one of the first and second types of bi-directional message by a quiet time sample during which no message is transmitted. | 06-05-2014 |
20140152460 | Toolstring Topology Mapping in Cable Telemetry - Toolstring topology mapping systems having a downhole toolstring including a master node controller and a plurality of nodes and related methods. The methods involve querying each of the plurality of nodes in the downhole toolstring for actual topology information, receiving actual topology information from each of the plurality of nodes in the downhole toolstring in response to querying, and generating a topology map of the downhole toolstring based on the actual topology information from each of the plurality of nodes in the downhole toolstring. The methods can also involve comparing the topology map with the input topology information to identify topology mismatch and then take remedial actions if needed. | 06-05-2014 |
20140354446 | Cable Telemetry Synchronization System and Method - Cable telemetry synchronization systems and methods. The synchronization can involve positioning downhole equipment into a wellbore via a cable operatively coupled to a surface module that can include a telemetry system master clock. The downhole equipment can include a toolbus master node and at least one slave node module having a node clock operatively coupled to the toolbus master node. The synchronization can also involve sending a frame start command to the at least one slave node module from the toolbus master node at predetermined intervals, receiving a clock value from each of the at least one slave node module, calculating a clock offset for each of the at least one slave node module, and sending an absolute clock value and the calculated clock offset for each of the at least one slave node module via a downlink synchronization command to the at least one slave node module. | 12-04-2014 |
Patent application number | Description | Published |
20080212216 | Optical multipass cell for repeated passing of light through the same point - The present invention is a multipass unipoint optical cell used for the improved analysis of samples by transmission, reflection, Raman or fluorescence spectroscopy by the multiple reimaging of light through the same analysis point. The cell comprises two or more identical optical reimaging elements each consisting of two symmetrically opposing, identical, confocal, and coaxial parabolic reflective surfaces with the property to refocus any ray of light coming from the common focal point onto one of the parabolic surfaces, back to the same focal point by the other parabolic surface at an angle to the incoming ray. Two or more of these reimaging optical elements can be configured around the common focal point to form different multipass unipoint optical cell configurations, all the passes crossing in the analysis point where a sample is brought to interact with light, the effect of said interaction being enhanced in proportion to the number of passes. | 09-04-2008 |
20100201977 | OPTICAL MULTIPASS CELL FOR REPEATED PASSING OF LIGHT THROUGH THE SAME POINT - An optical reimaging element comprising: a first off-axis parabolic mirror having only the portion of the mirror surface below the first plane that passes through its focal point and is perpendicular to the axis of the first parabola associated with the first mirror, the portion of the first mirror being on the same side of the first plane as the vertex of the first parabola; a second off axis parabolic mirror identical to the first mirror also having only the portion of the mirror surface below the second plane that passes through its focal point and is perpendicular to the axis of the second parabola associated with the second mirror, the portion of the second mirror being on the same side of the second plane as the vertex of the second parabola; and the first and second mirrors being in optical communication with each other so that their first and second planes coincide and so that their parabolic mirror surfaces are symmetrically opposing, confocal, and coaxial thereby having the property that a ray of light coming from the common focal point of the parabolic mirrors and incident onto one of the parabolic mirrors reflects to the other parabolic mirror wherein it reflects back to the focal point, but at an angle with the direction in which it left the focal point. An optical reimaging element comprising: a material, the material comprising: a top face; a bottom face; a first side face; a second side face; a third side face; and where the first and second of the side faces are in the shape of two symmetrically opposing, confocal, and coaxial parabolic surfaces so that the common axis of the parabolic surfaces is parallel and midway between the top and bottom faces and the third side face is spherical with the center of curvature coincident with the common focal point of the parabolic surfaces so that any ray of light originating from the common focal point and directed to the element is incident normal to the third face, transmits into the element without changing direction, is incident on one of the parabolic surfaces, reflects by total internal reflection to the other of the two parabolic surfaces, is reflected again by total internal reflection to come at normal incidence to the third face, transmits out of the element without changing direction and returns to the common focal point at an angle to the direction in which it left the focal point. | 08-12-2010 |