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| Number | Title | Issue Date |
| 7385177 | Light guide rotation rate detector with coupled optical resonators A method and device are presented for use in determining a rate of rotation of an object. The device comprises a light guide comprising an arrangement of a plurality of coupled optical resonators arranged along a curvilinear optical path. This allows for determining... | 06/10/2008 |
| 7372576 | System and method for generating beams of light using an anisotropic acousto-optic modulator A light source system includes a beam source generating a first input beam of light with first and second beam components. The first component has a first linear polarization and a first frequency. The second component has a second linear polarization and a second f... | 05/13/2008 |
| 7365856 | Method of motion correction in optical coherence tomography imaging An image data set acquired by an optical coherence tomography (OCT) system is corrected for effects due to motion of the sample. A first set of A-scans is acquired within a time short enough to avoid any significant motion of the sample. A second more extensive set ... | 04/29/2008 |
| 7339678 | Method and system of using odd harmonics for phase generated carrier homodyne A method and system for providing fast interrogation of a signal received from a fiber optic sensor array using a low drive voltage, by modulating the array signal with a phase generated carrier optical signal having an odd harmonic modulation frequency, sending it ... | 03/04/2008 |
| 7333698 | Optical scanning device An optical scanning device including a bundle of optical fibers adapted for delivering optical energy beams therethrough, and an actuator coupled to the bundle of optical fibers adapted to bend the bundle of optical fibers in a scanning motion. ... | 02/19/2008 |
| 7327462 | Method and apparatus for direct detection of signals from a differential delay heterodyne interferometric system A direct detection method and apparatus for a fiber optic acoustic sensor array systems using an in-line Michelson sensor TDM array and an interferometric section having two acousto-optic modulators that produce optical pulses that are frequency shifted with respect... | 02/05/2008 |
| 7327465 | Compensation for effects of beam misalignments in interferometer metrology systems In general, in a first aspect, the invention features methods that include deriving a first beam and a second beam from an input beam and directing the first and second beams along different paths, where the path of the first beam contacts a measurement object, prod... | 02/05/2008 |
| 7286237 | Fiber optic sensor 3-Mirror fiber optic sensor for simultaneous measurement of dual parameters such as hydrogen concentration and temperature, is formed from 2 optical leads comprising 3 reflective surfaces, and defining 2 optical cavities. The effect of temperature on each of the cav... | 10/23/2007 |
| 7282698 | System and method for monitoring a well An optical fiber extends down hole from an OFDR. A first set of sensors with a centrally-located reference reflector is disposed over a first fiber length, and a second set of sensors with a centrally-located reference reflector is disposed over a second fiber lengt... | 10/16/2007 |
| 7277180 | Optical connection for interferometry A method including: (i) directing a beam to an interferometer head using an optical connection, the beam including a first beam component having a first polarization and a first frequency and a second beam component having a second polarization different from the fi... | 10/02/2007 |
| 7265837 | Sensitive polarization monitoring and controlling Techniques and devices for monitoring polarization of light using at least two polarization elements where the difference between the outputs of the two polarization elements are used to monitor a change in polarization. ... | 09/04/2007 |
| 7262902 | High gain resonant modulator system and method An optical resonant modulator includes an optical ring resonator and an optical loop that is coupled to the optical ring resonator by two couplers. The optical ring resonator can have a hybrid design in which the ring resonator is formed on an electro-optically pass... | 08/28/2007 |
| 7245382 | Downhole optical sensor system with reference Embodiments of the present invention generally provide methods, apparatus, and systems for compensating for frequency fluctuations in source light used to interrogate an optical sensor. The optical sensor may be interrogated to generate a sensor signal. A reference ... | 07/17/2007 |
| 7232485 | Method of determining crystallization The present invention relates to a method for determining crystallization in a very small amount of a material of interest (eg a chemical or biological material of interest). ... | 06/19/2007 |
| 7180601 | Optical system featuring chirped Bragg grating etalon for providing precise reference wavelengths An optical system has a broadband source and a chirped Bragg grating etalon. In operation, the broadband source provides a broadband optical signal. The chirped Bragg grating etalon responds to the broadband optical signal, for providing a chirped Bragg grating etal... | 02/20/2007 |
| 7174037 | Imaging apparatus and method An apparatus and method for imaging a sample, the apparatus including a source for irradiating a sample with a beam of substantially continuous electromagnetic radiation having a frequency in the range 25 GHz to 100 THz; means for subdividing an area of the sample w... | 02/06/2007 |
| 7159653 | Spacer sub The present invention involves a method and apparatus for communicating from within a wellbore to the surface of the wellbore, as well as communicating from the surface of the wellbore to downhole within the wellbore. More specifically, the present invention involve... | 01/09/2007 |
| 7142736 | Distributed fiber sensor with interference detection and polarization state management Polarization effects are managed to provide differential timing information for localizing disturbances affecting two or more counter-propagating light signals on one or more optical waveguides passing through a detection zone. Activity can be localized to a point f... | 11/28/2006 |
| 7123364 | Acoustic imaging microscope An imaging system includes: an object wavefront source and an optical microscope objective all positioned to direct an object wavefront onto an area of a vibrating subject surface encompassed by a field of view of the microscope objective, and to direct a modulated ... | 10/17/2006 |
| 7119347 | Ion implantation apparatus and method An ion implantation apparatus includes a laser beam irradiation unit which irradiates the surface of a target substrate with laser beam. The angle of an optical axis of the laser beam relative to the surface is adjustable. A reference line defining unit is adapted t... | 10/10/2006 |
| 7116421 | Device and method for differential sensing of hydrogen gas using thermoabsorptance or thermoreflectance A hydrogen sensor, useful for trace hydrogen gas detection. The sensor involves providing a gas sample, generating modulated optical excitation sources, bringing the optical excitation source to the side of a metalized thin pyroelectric film, and detecting via a loc... | 10/03/2006 |
| 7097973 | Method for monitoring molecular species within a medium Apparatus and methods for monitoring, analyzing, and/or discriminating molecular species, preferably a biomolecule, within a medium using a multisensor array (MSA) and multivariate processing. Biological compounds such as nucleotides and polynucleotides can be detec... | 08/29/2006 |
| 7076127 | Optical switch and safety apparatus using the same Provided are optical switches applicable to various safety apparatuses which can control an operation of a circuit by detecting a switching signal such as pathogens and toxic substances, and safety apparatuses using the optical switches. The optical switch comprises... | 07/11/2006 |
| 7076122 | Patch-type extrinsic Fabry-Perot interferometric fiber optic sensor and real-time structural vibration monitoring method using the same A patch-type extrinsic Fabry-Perot interferometric fiber optic sensor and a real-time structural vibration monitoring method using the same are disclosed. The patch-type extrinsic Fabry-Perot interferometric fiber optic sensor is provided by combining the existing E... | 07/11/2006 |
| 7064329 | Amplifier-enhanced optical analysis system and method An amplifier-enhanced optical analysis system and method to optically analyze a molecular component of a gas, liquid, or solid. The amplifier-enhanced optical system comprises a laser, a light amplifier, and an optical analysis means, all optically coupled so that l... | 06/20/2006 |
| 7061617 | Method of determining the capacity of a cosmetic to diffuse and/or absorb light Methods and apparatus for determining the optical characteristics of cosmetic substances are disclosed. The method includes illuminating the surface of the substance with an incident light beam so as to form a back-scatter spot, obtaining an image of the back-scatte... | 06/13/2006 |
| 7057742 | Frequency-scanning interferometer with non-specular reference surface A frequency-scanning interferometer is modified to include a diffuse reference surface. An illuminating system produces an expanding measuring beam, portions of which reflect from a test object surface and the diffuse reference surface on converging paths to an imag... | 06/06/2006 |
| 7053359 | Optical multi-gate device and method A logical element including an optical junction coupled to at least two optical inlets and to at least one optical outlet. Incoming light beams of coherent monochromatic light beams and the same uniform frequency are applied to the optical inlets, and their super-po... | 05/30/2006 |
| 7054521 | Architecture for large optical fiber array using standard 1×2 couplers Sensor arrays utilizing standard 1×2 couplers reduce the differences in the returned optical power levels by appropriate selection of the coupling ratios. Preferred embodiments are described that comprise 6 distribution fiber lines and 16 return fiber lines. One em... | 05/30/2006 |
| 7031560 | Resonant sensor with optical excitation and monitoring device using this sensor Resonant sensor with optical excitation and monitoring device using this sensor. This sensor comprises a doped silicon resonator (4) to absorb radiation (Re) with wavelength longer than 1100 nm and may be used for example to monitor the pressure in an oil wel... | 04/18/2006 |
| 7012696 | Optical heterodyne detection in optical cavity ringdown spectroscopy The disclosure relates to optical heterodyne detection cavity ringdown spectroscopy. In one aspect the disclosure relates to an optical system comprising a ringdown cavity cell defining a resonant optical cavity, means for directing coherent light selected from the ... | 03/14/2006 |
| 7012245 | Calculation of sensor array induced phase angle A sensor array employs a parameter to induce a time-varying phase angle φ on an optical signal that comprises a phase generated carrier. The phase angle φ is calculated through employment of only four samples, where all the four samples are based on the optical si... | 03/14/2006 |
| 7009378 | Time division multiplexed optical measuring system A time division multiplexed optical voltage measuring system includes an optical voltage sensing system module including, (i) a plurality of optical sensors where each sensor is responsive to an input interrogation light wave, and (ii) one or more optical outputs af... | 03/07/2006 |
| 6989903 | Polarization diversity detector mask selection algorithm A method for selecting a cell from each member of a tri-cell photodetector array used to detect optical signals output from a multichannel sensor array to indicate interference between two optical signals of unknown polarization incident upon the tri-cell photodetec... | 01/24/2006 |
| 6973223 | Device for providing polarized light In a device (100) for continuously varying the extinction ratio, ER, a laser diode (102) is connected to a first end of a PZ fiber (108). At a second end, the PZ fiber is connected to a connector (110). At the other end of the connector a... | 12/06/2005 |
| 6970396 | Fiber-optic seismic array telemetry, system, and method A method for attaching seismic sensors in a seismic cable that includes a strength member inside a cable jacket with a fiber tube wound around the strength member and a sensor station base attached around the cable wherein the jacket is removed, at least one fiber t... | 11/29/2005 |
| 6958816 | Microrheology methods and systems using low-coherence dynamic light scattering Methods and systems for using dynamic light scattering, for investigating local rheological responses of complex fluids over a frequency range larger than that provided by standard instrumentation. A low-coherence radiation source is used with fiber optics to allow ... | 10/25/2005 |
| 6947637 | Measurement of fiber strain during processing A method and system for determining strain impressed on an optical fiber at a possibly indeterminate temperature. The fiber (14) is formed with at least two sensors having different strain and temperature characteristics, preferably a Bragg Fabry-Perot sensor... | 09/20/2005 |
| 6934035 | System and method for measuring optical distance The methods of the present invention are directed at an accurate phase-based technique for measuring arbitrarily long optical distances with sub-nanometer precision. A preferred embodiment of the present invention method employs a interferometer, for example, a Mich... | 08/23/2005 |
| 6915686 | Downhole sub for instrumentation A downhole sub for instrumentation, such as a fiber optic sensor. The sub is configured to be connected to a string of pipe, such as a string of tubing. The sub first comprises an essentially concentric tubular body. The tubular body has an inner diameter that gener... | 07/12/2005 |
