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| Number | Title | Issue Date |
| 8102535 | Fiber optic gyroscope using a low-polarization and polarization-maintaining hybrid light path A fiber optic gyroscope using a low-polarization and polarization-maintaining hybrid light path comprises an optical meter head and a circuit signal processing part, The optical meter head comprises: a light source, a multi-functional integrated optic chip, a detect... | 01/24/2012 |
| 8102536 | Determining and compensating for modulator dynamics in interferometric fiber-optic gyroscopes Determining linear modulator dynamics in an interferometric fiber-optic gyroscope may be accomplished by applying a stimulus at a point within the gyroscope, observing a response in an output of the gyroscope, and determining, from the observed response, the linear ... | 01/24/2012 |
| 8077321 | System to reduce gyroscopic errors with limited power supply quality in a fiber optic gyroscope One embodiment is directed to a power supply for a fiber optic gyroscope that comprises at least one main power supply, at least one demodulator local power supply to operatively couple the main power supply to a demodulator included in the fiber optic gyroscope, an... | 12/13/2011 |
| 8068231 | Fiber optic sensor using a Bragg fiber An optical sensor includes an optical coupler configured to receive a first optical signal and to split the first optical signal into a second optical signal and a third optical signal. The optical sensor further includes a Bragg fiber in optical communication with ... | 11/29/2011 |
| 8040522 | Method and assembly for an interferometric fiber optic gyro A method for determining an accurate phase difference between a phase of a light beam in each of two light paths, the two light paths being in a rotating interferometric fiber optic gyro, by measuring a first phase difference due to angular velocity of the rotating ... | 10/18/2011 |
| 7978334 | Matter-wave rate gyro integrated onto an atom chip and associated Accelerometer The general field of the invention is that of rate gyros, of the matter-wave type, allowing the measurement of a speed of rotation in a given direction of measurement. This type of rate gyro works by the Sagnac effect and uses ultracold atoms to perform the measurem... | 07/12/2011 |
| 7973938 | Bias-reduced fiber optic gyroscope with polarizing fibers A fiber optic gyroscope includes a light source, a coupler coupled to the light source, a photodetector coupled to the coupler, an integrated optic circuit (IOC) coupled to the coupler by a first element, and a sensing loop coupled to the IOC by second and third ele... | 07/05/2011 |
| 7929143 | Integrated resonating gyro accelerometer in a semiconductor substrate An integrated interferometric gyroscope and accelerometer device. An example device includes a cantilever beam, a package having a post connected to one end of the beam, a piezoresistor driver, a piezoresistor sensor, and a semiconductor interferometric optical gyro... | 04/19/2011 |
| 7924427 | Photonic crystal based rotation sensor A gyroscope having photonic crystals for sensing rotation uses the Sagnac effect to determine angular motion. The gyroscope comprises a photonic crystal capable of guiding counter-propagating light beams in a closed path. A light source, coupling, and detection appa... | 04/12/2011 |
| 7911619 | Low-noise fiber optic sensor utilizing a laser source A fiber-optic sensor includes an optical fiber coil and a laser source optically coupled to the coil. Light from the source is transmitted to the coil as a first signal propagating along the coil in a first direction and a second signal propagating along the coil in... | 03/22/2011 |
| 7911620 | Optical sensor utilizing hollow-core photonic bandgap fiber with low phase thermal constant An optical sensor includes an optical coupler. The optical sensor further includes a photonic bandgap fiber having a hollow core and an inner cladding generally surrounding the core. The photonic bandgap fiber is in optical communication with the optical coupler. Li... | 03/22/2011 |
| 7903255 | Sagnac sensor with nested waveguides Proposed optical device is based on counter-propagating optical fields within at least one nested waveguide-cavity loop, where the part of the waveguide loop is fold into the external waveguide loop. The nesting is performed using at least one waveguide crossing sec... | 03/08/2011 |
| 7894073 | Bias-instability reduction in fiber optic gyroscopes Apparatus for providing Bias-Instability reduction in Fiber Optic Gyroscopes are provided. In one embodiment, an optical circuit for a fiber optic gyroscope having a broadband light source and an optical fiber loop comprises: a PM fiber of length v; an IOC coupled t... | 02/22/2011 |
| 7872758 | Determining and compensating for modulator dynamics in interferometric fiber-optic gyroscopes Determining linear modulator dynamics in an interferometric fiber-optic gyroscope may be accomplished by applying a stimulus at a point within the gyroscope, observing a response in an output of the gyroscope, and determining, from the observed response, the linear ... | 01/18/2011 |
| 7835008 | Gyro employing semiconductor laser A semiconductor laser gyro including a photodetector and a semiconductor laser 10 that emits first and second laser lights. The photodetector is disposed in a position where interference fringes are formed by the first and second laser lights. The semiconduct... | 11/16/2010 |
| 7817284 | Interferometric fiber optic gyroscope with off-frequency modulation signals Interference in a rotation rate detector signal of an interferometric fiber-optic gyroscope from a bias phase modulator signal may be reduced or substantially avoided by transmitting one or more off-frequency signals having a frequency other than the eigenfrequency ... | 10/19/2010 |
| 7777889 | Bias-instability reduction in fiber optic gyroscopes A computer-implementable method of reducing bias instability in a fiber optic gyroscope includes receiving, with a computer, a first data set enabling the computer to generate a model of the gyroscope, including a light source, a photodetector, and a plurality of op... | 08/17/2010 |
| 7746475 | Microgyroscope A new high-performance, compact microgyroscope is implemented using a microlaser such as a microsphere laser or a microdisc laser that can be easily reduced in size. The microgyroscope includes a pumping unit for inputting pumping light for optical pumping, at least... | 06/29/2010 |
| 7738109 | Fiber optic sensor using a Bragg fiber An optical sensor includes a directional coupler comprising at least a first port, a second port, and a third port. The first port is in optical communication with the second port and with the third port such that a first optical signal received by the first port is... | 06/15/2010 |
| 7710576 | Method and apparatus for monitoring angle random walk of a fiber optic gyroscope A system for determining a level of angle random walk (ARW) associated with a fiber optic gyroscope (FOG) includes first and second photodiodes. The first photodiode is configured to receive a first light signal from a light source associated with the FOG. The secon... | 05/04/2010 |
| 7697143 | Reliable low loss hollow core fiber resonator An optical coupling device for connecting hollow core optical fiber coils in a fiber optic gyro system. An example fiber optic gyro system includes a recirculator or an integrated optics chip, a fiber coil of hollow core optical fiber with first and second ends, and... | 04/13/2010 |
| 7630082 | Systems and methods for high precision feedback control in closed loop sensors Improved methods and systems for feedback signals in a sensor system. An example method demodulates a sense signal using an analog demodulator and also demodulates the sense signal using a digital demodulator. The difference between the result of the analog demodula... | 12/08/2009 |
| 7619743 | Optical sensor utilizing hollow-core photonic bandgap fiber with low phase thermal constant An optical sensor includes a directional coupler comprising at least a first port, a second port, and a third port. The first port is in optical communication with the second port and with the third port such that a first optical signal received by the first port is... | 11/17/2009 |
| 7586619 | Spectral balancing system and method for reducing noise in fiber optic gyroscopes Methods and apparatus are provided for reducing output noise of optical gyros. The apparatus includes a sensing system for circulating counter-propagating light beams and producing an output light beam, a coupler having multiple ports and supplying an input light be... | 09/08/2009 |
| 7489404 | Fiber-optic interferometric rotation speed sensor including a non-linear mirror An fiber-optic interferometric rotation sensor device has a laser source combined with an optical fiber. These are configured to cause interference between a beam from the laser source and a beam coming from the optical fiber. The laser source includes an optical ca... | 02/10/2009 |
| 7453576 | Method and system for calibrating a fiber optic gyroscope According to one aspect of the present invention, a method for calibrating a fiber optic gyroscope is provided. A method is provided for calibrating a fiber optic gyroscope. First and second portions of light from a first light source are propagated through a fiber ... | 11/18/2008 |
| 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 |
| 7372574 | System and method for stabilizing light sources in resonator gyro Methods and apparatus are provided for stabilizing laser light sources of a resonator gyro. A resonator gyro comprises a first light source configured to produce a first input light, a second light source configured to produce a second input light, a resonator coupl... | 05/13/2008 |
| 7352471 | Embedded interferometric fiber optic gyroscope systems and methods In accordance with at least one embodiment of the present invention, a system includes a gyroscope and a flight vehicle operatively connected to the gyroscope. The gyroscope includes a length of fiber optic cable arranged in loop and configured to surround an interi... | 04/01/2008 |
| 7349589 | Photonic crystal fibers and medical systems including photonic crystal fibers In general, in one aspect, the invention features apparatus that include an assembly including a radiation input port configured to receive radiation from a radiation source and an output port configured to couple the radiation to a photonic crystal fiber, the assem... | 03/25/2008 |
| 7338774 | Method for determining activity of cell cycle regulatory factor and method for diagnosing cancer using the same A method for determining the activity of a cell cycle regulatory factor comprising the steps of: preparing a sample for measuring a cyclin-dependent kinase/cyclin complex from living cells; reacting adenosine 5′-... | 03/04/2008 |
| 7333209 | Fiber optic gyroscope asynchronous demodulation A clock system for a fiber optic gyroscope is provided that includes a highly-tunable clock for the bias modulation and a separate asynchronous high-speed clock for the photodetector sampling. By separating the two clocks rather than using two derivatives of the sam... | 02/19/2008 |
| 7327460 | Transmission mode RFOG and method for detecting rotation with RFOG Methods and apparatus are provided for sensing a rotation rate of a ring resonator in a transmission mode. A ring resonator for circulating light beams in counter-propagating directions comprises an optical fiber coil having a hollow core and first and second ends. ... | 02/05/2008 |
| 7324205 | Optical accelerometer, gravitometer, and gradiometer An optical accelerometer, gravitometer, and gradiometer have a light source, a beam splitter, a light medium, and a plurality of mirrors. The light beam from the light source is split into two beams that counter-propagate through the accelerometer. The acceleration ... | 01/29/2008 |
| 7324206 | Method for determination/compensation of bias errors/random walk errors induced by the light source in fiber-optic Sagnac interferometers A method for determination of/compensation for the bias/random walk errors induced by the light source in fiber-optic Sagnac interferometers employing a modulation method for stochastically independent shifting of the operating point to the points of highest sensiti... | 01/29/2008 |
| 7317537 | System and method for recovering lost data in a gyroscope sensor system A system and method for recovering lost data in an electronic gyroscope sensor system are disclosed, which use a linear adaptive predictive technique for determining what data was lost by the gyroscope sensor system during a disruptive interval involved. More precis... | 01/08/2008 |
| 7302119 | Polymer phase modulator An optical phase modulator comprising a plurality of non-polarizing waveguides having a layered stack including a core between at least one layer of cladding material, wherein the core is constructed of electro-optic material(s), wherein the layers of cladding mater... | 11/27/2007 |
| 7298491 | Magnetic compensators for fiber optic gyroscopes A fiber optic gyroscope (FOG) includes a sensing coil with a particular magnetic sensitivity magnitude and direction with respect to the geometric axis of the sensing coil. The FOG also includes a plurality of magnetic compensators. Each magnetic compensator is fabr... | 11/20/2007 |
| 7290737 | Nonsurvivable momentum exchange system A demiseable momentum exchange system includes a base and a flywheel rotatably supported on the base. The flywheel includes a web portion defining a plurality of web openings and a rim portion. The momentum exchange system further includes a motor for driving the fl... | 11/06/2007 |
| 7289687 | Polarization-maintaining optical fiber A polarization-maintaining optical fiber which exhibits an excellent polarization-maintaining performance and significantly low splice loss when spliced with a polarization-maintaining optical fiber having a cladding 125 μm in diameter even if the polarization-main... | 10/30/2007 |
