Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 8149417 | Synchronous radiation hardened fiber optic gyroscope A synchronous fiber optic gyroscope includes a light source, an optical coupler in optical communication with the light source, an optical modulator in optical communication with the coupler, and a fiber optic coil in optical communication with the modulator. A dete... | 04/03/2012 |
| 7889351 | Systems and methods for monitoring angle random walk A gyroscope for determining an angular rate output. The gyroscope includes a first demodulator configured to demodulate an angular rate measurement at a first bias modulation frequency to determine the angular rate signal and a second demodulator configured to demod... | 02/15/2011 |
| 7859678 | Automatic gain control for fiber optic gyroscope deterministic control loops An automatic gain control system for a fiber optic gyroscope control loop includes an adjustable gain applied to the gyro output signal. A pilot signal is injected into the fiber optic gyroscope control loop. A compensation loop receives signals output from the cont... | 12/28/2010 |
| 7777890 | Method and power-assisted optic-fiber measuring device and gyro The invention relates to a method and an optical-fiber measuring device including a light source with a light power P, a Sagnac ring interferometer in which propagate two counter-propagating waves, a detector receiving a light flux from the interferometer and conver... | 08/17/2010 |
| 7715014 | Methods and systems for fiber optic gyroscopes vibration error suppression Systems and methods for performing vibration error suppression in a fiber optic gyro sensor. An example system includes a light source, a sensing loop assembly, a photo detector, and a processing component. The light source generates a light signal that is then modu... | 05/11/2010 |
| 7633626 | Fiber optic gyroscope deadband circumvention apparatus and method A fiber optic gyroscope signal process dither system permits application of a low amplitude dither signal for many sampling periods without increasing the noise in the sampled outputs due to residual dither signals. A dither loop and an accumulator are added to a cl... | 12/15/2009 |
| 7583384 | High resolution IOC drive and method for driving fiber optic gyroscopes Methods and system are provided for driving light through a sensing coil of an optical gyro. The system includes a photodetection circuit having an input for receiving an optical output from the sensing coil and having an output, and a signal processing circuit havi... | 09/01/2009 |
| 7515272 | Digital feedback systems and methods for optical gyroscopes A digital feedback system for an optical gyroscope include a fiber optic sensing coil, an optical phase modulator, a photo detector and a processor. The sensing coil induces a phase differential between light waves traveling though the coil. The optical phase modula... | 04/07/2009 |
| 7505139 | Signal processing for a Sagnac interferometer Disclosed is a method and apparatus for modulating the phase difference between a pair of optical waves that exit a Sagnac interferometer, and, more particularly, one that is commonly employed as a fiber gyro, and includes a detector responsive to phase difference b... | 03/17/2009 |
| 7372278 | Electric potential measuring apparatus electrostatic capacitance measuring apparatus, electric potential measuring method, electrostatic capacitance measuring method, and image forming apparatus An electric potential measuring apparatus includes a detecting electrode, a modulator for changing an electrostatic capacitance between a measurement object and the detecting electrode by mechanical vibration, a charge detector for detecting the amount of charges el... | 05/13/2008 |
| 7359061 | Method and apparatus for providing polarization insensitive signal processing for interferometric sensors 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 eli... | 04/15/2008 |
| 7336364 | Minimal bias switching for fiber optic gyroscopes A system and method is provided for reducing the sensitivity of the rotation rate measurement to the frequency dependence of the feedback modulator. Specifically, the system and method uses a minimal bias switching technique to reduce rate errors associated with the... | 02/26/2008 |
| 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 |
| 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 |
| 7315671 | Display illumination system and manufacturing method thereof An illumination system (8) comprises an optical waveguide (18) which is made from optically transparent components and has four end faces (10, 10′). A light source (12) whose light is coupled into the optical waveguide (18) via o... | 01/01/2008 |
| 7295323 | Adhesive system and method for forming a fiber optic gyroscope sensing coil Adhesive system and method are provided for affixing a fiber optic coil to a hub with an adhesive in a fiber optic gyroscope. The adhesive system comprises a fiber optic coil, a substantially cylindrical hub configured to couple with the fiber optic coil, and an arr... | 11/13/2007 |
| 7295322 | Optical power measurement of a closed loop fiber optic gyroscope This disclosure describes fiber optic gyroscopes that have integrated power measurement capabilities, and related methods and apparatus. More particularly, it describes determining the optical power of a fiber optic gyroscope (FOG) by temporarily adjusting the phase... | 11/13/2007 |
| 7283246 | Method for regulating the operating frequency and multifunctional integrated circuit chip for a fiber-optic gyroscope A method for regulating the operating frequency of a closed loop fiber optic gyroscope. The demodulated output signal of a detector, as actual signal, is applied to the input of a main controller and, via a gating filter, to a VCO that determines the system clock of... | 10/16/2007 |
| 7277603 | Integrated optical waveform modulation A method of modulating an optical carrier. A target carrier modulation is computed based on an input data signal. An effective length of an optical modulator is then controlled based on the target carrier modulation. ... | 10/02/2007 |
| 7274460 | Stimulated rate optical power measurement in a fiber optic gyroscope Fiber optic gyroscopes having integrated power measurement capabilities and related methods and apparatus. More particularly, fiber optic gyroscopes having an integrated method for determining the optical power by applying an electronic stimulated rate internal to t... | 09/25/2007 |
| 7268342 | Determination of optical properties of a device under test in both directions in transmission and in reflection A method and a measurement setup for determination of optical properties of a device under test in both directions in transmission and in reflection, includes a coding device distinguishably coding at least two parts of a provided measurement signal, feeding element... | 09/11/2007 |
| 7236654 | Polymer phase modulator An optical phase modulator comprising a polarizing waveguide having two ends and 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 waveguide includes a m... | 06/26/2007 |
| 7233724 | Long period bragg grating optical signal attenuation An apparatus in one example comprises one or more light sources, one or more long period Bragg gratings that are optically coupled with the one or more light sources, and one or more amplification fibers that are optically coupled with the one or more long period Br... | 06/19/2007 |
| 7231103 | Variable lightwave functional circuit and variable lightwave functional apparatus The system of a variable lightwave functional apparatus comprising: an acousto-optical modulator for outputting wavelength multiplexed light containing a plurality of pulses having a first wavelength interval; a coupler arranged at an output of said acousto-optical ... | 06/12/2007 |
| 7231104 | Variable lightwave functional circuit and variable lightwave functional apparatus The system of a variable lightwave functional apparatus comprising: an optical amplifier for outputting wavelength multiplexed light containing a plurality of pulses having a first wavelength interval; a polarization branching/coupling device having a first port to ... | 06/12/2007 |
| 7228024 | Optical return loss detecting device An optical return loss detecting device is provided for measuring the optical return loss (ORL) of a device under test (DUT). The detecting device comprises a light source, an optical isolator connected to the light source for preventing reflected light by the DUT e... | 06/05/2007 |
| 7190463 | Method for preventing bias-errors as a result of synchronous interference in fiber-optic gyroscopes The method according to the invention for preventing bias errors as a result of synchronous interference in fiber-optic gyroscopes (FOGs) provides for an additional signal φE, which is periodical at the sampling clock rate and corresponds, for example, t... | 03/13/2007 |
| 7187448 | Nonreciprocal phase shift fiber-optic gyrometer The present invention relates to a fiber-optic gyrometer including a Sagnac interferometer using two light waves propagating in opposite directions in a interferometer loop including a photodetector which delivers an electrical signal Ud representing the light inten... | 03/06/2007 |
| 7173712 | Method and device for increasing the long-term operational reliability of a fiber optic interferometer A method for increasing the long-term operational reliability of a fiber optic interferometer. Noise in a detector output signal is set to a desired value by correcting the detector light power. Detector light power is corrected by varying a light source current of ... | 02/06/2007 |
| 7167250 | System and method for reducing fiber optic gyroscope color noise A phase jump amplitude and timing controller is used in a fiber optic gyroscope for suppressing color noise. The phase jump amplitude and timing controller inserts a phase/voltage jump into the feedback signal of the loop closure electronics of the fiber optic gyros... | 01/23/2007 |
| 7130495 | Variable lightwave function circuit and variable lightwave function device Characteristics are rendered variable and high-functional by using the side-pressure inductive polarization mode coupling of a PMF to thereby change the position and magnitude of a side pressure. An input light is incident via a polarizer (2), and an outgoing... | 10/31/2006 |
| 7073384 | Method and apparatus for remote measurement of vibration and properties of objects A method and apparatus (10) is provided which employs phase or amplitude modulated electromagnetic probing waves (20) (in optical or microwave frequency ranges or both) emitted toward a vibrating object (8). The optical and/or microwave probing ... | 07/11/2006 |
| 7038783 | Eigen frequency detector for Sagnac interferometers A system for detecting the eigen frequency of a sensing coil in a fiber optic gyro (FOG) that includes a fiber coupler connected to the light source, an integrated optics chip (IOC) capable of modulating light received from the light source via the fiber coupler, a ... | 05/02/2006 |
| 7034946 | Fiber optic gyroscope sensing loop doubler A fiber optic ring interferometer, such as an interferometric fiber optic gyro (IFOG), with a sensing loop doubler. The IFOG device includes a light source, a circulator in optical communication with the light source and a photo diode, an integrated optical chip (IO... | 04/25/2006 |
| 6969968 | Control device and controlling method of inverter A carrier wave frequency generating unit 9 modulates a frequency f of a carrier wave in a triangular shape. Occurrence of drawbacks due to the frequency f of the carrier wave can thereby be prevented. Because the frequency f of the carrier wave can be easily ... | 11/29/2005 |
| 6943871 | Optical dispersion measurement apparatus and measurement method using same An optical dispersion measurement apparatus includes a device for generating a light beam; wiring for inputting the light beam to a first terminal of an optical distributor; wiring for outputting the input light beam as a plurality of light beams; an optical modulat... | 09/13/2005 |
| 6856751 | Method and system for obtaining variable optical attenuation with very low polarization dependent loss over an ultra wide dynamic range A method and system of operating a variable optical attenuator to provide a required total attenuation in a planar lightwave circuit. The method comprises providing a first Mach-Zehnder interferometer having a first and a second arm carrying signals in an arbitrary ... | 02/15/2005 |
| 6778720 | Dual slope fiber optic array interrogator An apparatus and method is presented presented to provide wide dynamic range measurements of the input phase to a time domain multiplex interferometer array using a dual slope modulation method for interrogation. Features of the present invention include a topology ... | 08/17/2004 |
| 6760111 | Digital phase modulator Apparatus and a method for compensating production or operationally-induced inaccuracies in the binary-weighted electrodes of a high-resolution digital phase modulator of, for example, a fiber optic gyroscope. Programmable correction values are employed to increase ... | 07/06/2004 |
| 6744519 | Methods and apparatus for fiber optic gyroscope dead band error suppression modulation According to the preferred exemplary embodiments of the present invention, there is provided a phase jump amplitude and timing controller for suppressing the voltage-dependent errors responsible for the dead band. The phase jump amplitude and timing controller inser... | 06/01/2004 |
