| Patent Number |
Title Of Patent |
Date Issued |
| 7558155 |
Optical sensor interrogation with wavelength grouping in time slots |
July 7, 2009 |
| Seismic sensor systems and sensor station topologies, as well as corresponding cable and sensor station components, manufacturing and deployment techniques are provided. For some embodiments, networks of optical ocean bottom seismic (OBS) stations are provided, in which sensor statio |
| 7551517 |
Seabed seismic station packaging |
June 23, 2009 |
| A seismic sensor station includes a housing containing a fiber optic hydrophone and a fiber optic accelerometer that can both be made from a single length of optical fiber arranged inside the housing. The fiber optic accelerometer is arranged in a liquid/oil filled compartment of the |
| 7480056 |
Multi-pulse heterodyne sub-carrier interrogation of interferometric sensors |
January 20, 2009 |
| A method for interrogating time-multiplexed interferometric sensors using multiple interrogation pulses so as to increases the allowable interrogation pulse duty-cycle and improve the signal-to-noise ratio. In each TDM repetition period a sequence of multiple interrogation pulses are |
| 7466422 |
Method and apparatus for suppression of crosstalk and noise in time-division multiplexed interfe |
December 16, 2008 |
| Unwanted signal components in time-division multiplexed (TDM) systems may lead to crosstalk and noise if these pulses overlap with signal pulses from an interrogated sensor. The crosstalk and noise are dominated by interference between the signal pulses from the interrogated sensor and |
| 7366055 |
Ocean bottom seismic sensing system |
April 29, 2008 |
| Seismic sensor systems and sensor station topologies, as well as corresponding cable and sensor station components, manufacturing and deployment techniques are provided. For some embodiments, networks of optical ocean bottom seismic (OBS) stations are provided, in which sensor statio |
| 7359061 |
Method and apparatus for providing polarization insensitive signal processing for interferometri |
April 15, 2008 |
| A method and apparatus that uses specific source modulation and detectors to detect a response that carries information about a system response matrix associated with each sensor in a interferometric sensor array and extracting a sensor response in a manner that eliminates polarizati |
| 7336365 |
Method and apparatus for suppression of crosstalk and noise in time-division multiplexed interfe |
February 26, 2008 |
| Unwanted signal components in time-division multiplexed (TDM) systems may lead to crosstalk and noise if these pulses overlap with signal pulses from an interrogated sensor. The crosstalk and noise are dominated by interference between the signal pulses from the interrogated sensor and |
| 7206075 |
Method and apparatus for reducing crosstalk interference in an inline Fabry-Perot sensor array |
April 17, 2007 |
| A method and apparatus for reducing crosstalk between sensors in an inline Fabry-Perot (FP) sensor array. The inline FP sensor array comprises a plurality of fiber Bragg gratings arranged periodically along an optical fiber. The sensors are formed between each of the Bragg gratings. A li |
| 7113287 |
Method and apparatus for reducing crosstalk interference in an inline Fabry-Perot sensor array |
September 26, 2006 |
| A method and apparatus for reducing crosstalk between sensors in an inline Fabry-Perot (FP) sensor array. The inline FP sensor array comprises a plurality of fiber Bragg gratings arranged periodically along an optical fiber. The sensors are formed between each of the Bragg gratings. A li |
| 7088878 |
Method and apparatus for producing depolarized light |
August 8, 2006 |
| A method and apparatus for producing depolarized light that is useful in forming interrogation signals for an optical sensor array and demodulator having reduced polarization-induced fading and phase noise. The depolarized light is produced by splitting a light beam, delaying a first |
| 7081959 |
Method and apparatus for providing polarization insensitive signal processing for interferometri |
July 25, 2006 |
| A method and apparatus that uses specific source modulation and detectors to detect a response that carries information about a system response matrix associated with each sensor in a interferometric sensor array and extracting a sensor response in a manner that eliminates polarizati |
| 7019837 |
Method and apparatus for reducing crosstalk interference in an inline Fabry-Perot sensor array |
March 28, 2006 |
| A method and apparatus for reducing crosstalk between sensors in an inline Fabry-Perot (FP) sensor array. The inline FP sensor array comprises a plurality of fiber Bragg gratings arranged periodically along an optical fiber. The sensors are formed between each of the Bragg gratings. A li |
