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| Number | Title | Issue Date |
| 5777737 | Apparatus and method for processing signals output from fiber optic rate gyroscope having 3×3 coupler A fiber optic rotation sensor includes a 3×3 optical coupler formed of first, second and third optical waveguides. The first, second and third optical waveguides are formed such that the fractions of light coupled from any one of the first, second and th... | 07/07/1998 |
| 5576534 | Error reduction by quasi non-multiplexed signal processing in a multiplexed fiber optic rotation sensor loop A digital controller produces control data signals for application to each of three fiber optic rotation sensors in a triaxial rotation sensing system. The digital controller also produces strobe signals corresponding to each fiber optic rotation sensor. ... | 11/19/1996 |
| 5513039 | Ultraviolet resistive coated mirror and method of fabrication A mirror for reflecting a selected frequency of light includes a plurality of alternating quarter wavelength thick layers of two dielectric materials that are resistive to physical and chemical changes upon exposure to ultraviolet radiation coated upon a ... | 04/30/1996 |
| 5504720 | Fiber optic planar hydrophone A plurality of air-backed elongate mandrels are arranged in an planar array such that their longitudinal axes are parallel. A length of a first optical fiber is wound around portions of each mandrel in a first group of the mandrels for exposure to the par... | 04/02/1996 |
| 4807170 | Drug dose rate calculator A drug dosage calculation system includes a hand held, battery operated computing device for use by nurses and other clinical personnel to make calculations pertaining to the drug administration rate and the corresponding flow rate settings of IV systems ... | 02/21/1989 |
| 4802363 | Apparatus and method for measuring liquid depth A flotation device inside an elongate frame rises to the level of a liquid whose depth is being measured. The flotation device is locked in the frame while the apparatus is withdrawn from the liquid. The liquid level may then read from a scale on the fram... | 02/07/1989 |
| 4801206 | Simplified ring laser gyroscope dither control and method A dither flexure is mounted between a ring laser gyroscope body and a support such that the ring laser gyroscope may be dithered to have angular oscillations about a sensing axis. A sensor provides signals indicative of the amplitude of the oscillations o... | 01/31/1989 |
| 4799752 | Fiber optic gradient hydrophone and method of using same The apparatus according to the invention is all-fiber optic device that produces an output indicative of the gradient of an acoustic wave in water. The device comprises a neutrally buoyant body having a relatively rigid outer case. When it is submerged in... | 01/24/1989 |
| 4797031 | Caisson sinking method A caisson sinking method comprises the steps of excavating the ground to make a support ditch having the same plan-view shape as a caisson to be sunk, casting into the excavated ditch a bearing material that can carry the caisson as supported in the ditch... | 01/10/1989 |
| 4792956 | Laser diode intensity and wavelength control The actual values of intensity and wavelength of the optical signal output from a laser diode are compared to desired values thereof to generate intensity and wavelength error signals. The rates of change of the wavelength and intensity as functions of te... | 12/20/1988 |
| 4790657 | Ring laser gyroscope curved blade flexure and support ring assembly and method A dither flexure for a ring laser gyroscope includes a central portion and a plurality of curved vanes extending therefrom to connect to a flexure ring. The flexure ring includes a boss in a central portion thereof. A glass ceramic ring having a pair of e... | 12/13/1988 |
| 4789240 | Wavelength switched passive interferometric sensor system This invention includes a fiber optic interferometer having a reference arm isolated from a physical parameter being monitored and a sensing arm exposed to the physical parameter being monitored. The sensing arm produces changes in the relative phase of t... | 12/06/1988 |
| 4784453 | Backward-flow ladder architecture and method A ladder architecture comprises an input optical fiber bus and an output optical fiber bus. A plurality of input optical couplers couple light between the input bus and a plurality of branching fibers. A plurality of output couplers couple light from the ... | 11/15/1988 |
| 4779985 | Dither suspension for ring laser gyroscope and method A dither suspension for a ring laser gyroscope includes a central hub and a plurality of blades extending therefrom. One half of the blades are connected to a support ring, and the other half are connected to a support base that is fixed to the case. The ... | 10/25/1988 |
| 4778239 | Feed-backward lattice architecture and method A lattice includes a transmit bus formed of a single mode optical fiber and a return bus formed of a multimode optical fiber. An optical transmitter applies input signals to the transmit bus, and an optical receiver receives the signals guided by the retu... | 10/18/1988 |
| 4775216 | Fiber optic sensor array and method A fiber optic sensor array comprises a single transmit optical fiber for guiding an incident optical signal through a plurality of sensing segments in the transmit optical fiber arranged in a series array. The sensor array may includes a single return opt... | 10/04/1988 |
| 4755057 | Path length control method for ring laser gyroscope The present invention provides for initializing the particular intensity peak selected to operate about, based upon the initial temperature of the gyroscope in order to maintain a selected integer number of wavelengths as the initial cavity path length fr... | 07/05/1988 |
| 4753507 | Piezoelectric loading housing and method A fiber squeezer includes a frame that applies a preload to an optical fiber to permit variation of the birefringence thereof by either increasing or decreasing the preload. The optical fiber and a piezoelectric transducer are retained in the frame, and a... | 06/28/1988 |
| 4753529 | Apparatus and method for precision adjustment of interferometer pathlength difference Intensity modulated incoherent light is input to an interferometer. The interferometer is preferably formed to have a first arm comprising a first optical fiber and a second arm comprising a second optical fiber. The fibers have an initial optical pathlen... | 06/28/1988 |
| 4740083 | Pathlength controller for ring laser gyroscope The present invention provides for initializing the particular intensity peak selected to operate about, based upon the initial temperature of the gyroscope in order to maintain a selected integer number of wavelengths as the initial cavity path length fr... | 04/26/1988 |
| 4738511 | Molecular bonded fiber optic couplers and method of fabrication A fiber optic coupler is formed by heating juxtaposed optically flat surfaces formed on two lengths of optical fiber to the glass transition temperature. The fibers bond together while preserving the molecular composition of the fibers at bonded region. D... | 04/19/1988 |
| 4729620 | Fiber optic frequency shifter This invention relates to fiber optic frequency shifters for producing optical signals of a desired frequency range for input to a device such as an optical rotation sensing system. The rotating birefringence is created in a length of fiber optic material... | 03/08/1988 |
| 4729622 | Fiber optic polarizer with error signal feedback This invention provides apparatus and methods for converting a lightwave of an arbitrary polarization propagating in a single mode optical fiber into a wave having a single linear polarization state. A polarization couples light of an undesired polarizati... | 03/08/1988 |
| 4725113 | Form birefringent cutoff polarizer and method The cladding and a portion of the core of a length of optical fiber are removed to form an interaction region. A form birefringent stack is positioned on the exposed core. The refractive index of the stack for polarizations parallel to the plane of the in... | 02/16/1988 |
| 4708014 | Device for testing of containers as to leakage or defects A device for testing containers as to leakage and defects is comprised of a container sealing portion (4), a pressure exerting portion, and a pressure gauge (8). Said pressure exerting portion is provided in the shape of a piston/cylinder system (2, 3) th... | 11/24/1987 |
| 4701607 | Temperature control laser detection apparatus Laser detection apparatus comprising a laser defining an active region and providing a double beam of coherent radiation, a sample to be tested located in a first part of the double beam of coherent radiation, a radiation detector arranged to receive radi... | 10/20/1987 |
| 4679894 | Electrically switched fiber optic directional coupler This invention relates to an electrically switchable fiber optic directional coupler. Two oppositely oriented blocks of an interaction material are placed adjacent the fibers in an evanescent field coupler. Application of an electromagnetic field to the i... | 07/14/1987 |
| 4666235 | Stable fiber optic polarizer This invention relates to fiber optic apparatus and methods for polarizing light for use in fiber optic devices, such as rotation sensors. A phase grating formed of alternating layers of dielectrics having different indices of refraction is placed adjacen... | 05/19/1987 |
| 4658447 | Toilette seat lock A locking shaft extends through passages in a mounting bracket, a seat bracket and a seat cover bracket to prevent small children from raising the seat and seat cover. The locking shaft and a plunger are mounted to an end cap with the plunger being slidab... | 04/21/1987 |
| 4638934 | Slitting and dicing machine for fiberglass mat and mats of other brittle abrasive fibers A machine for slicing matting of brittle fiber material comprising an elastomeric coated anvil roller and a slicer roller having a plurality of cutting discs mounted on an axis parallel to the longitudinal axis of the anvil roller, which depress the matti... | 01/27/1987 |
| 4632551 | Passive sampling interferometric sensor arrays This invention provides a sensor array using a plurality of fiber optic sensors connected between transmit fibers and receive fibers. The laser transmitter supplies pulses to the transmit fiber and fiber optic couplers couple the pulses from the transmit ... | 12/30/1986 |
| 4607889 | Shield tunnel boring machine A shield tunnel boring machine having at its boring head a pressure-resisting mud kneading chamber defined by a bulkhead, wherein the bulkhead is divided into outer peripheral and central bulkhead parts. The outer peripheral bulkhead part is fixed to the ... | 08/26/1986 |
| 4584106 | Chlorinator and method A chlorination system for distributing chlorine in a hot tub or spa. The system regulates the flow of water through a mixing chamber with a valve or stopcock to control the rate of chlorine distribution. An assembly of venturis and baffles also regulates ... | 04/22/1986 |
| 4576301 | Wheel protector A wheel protector is formed as a tray to fit inside a dish-type truck wheel to collect lubricants and other material as an axle is removed from the truck without demounting the wheel from the truck.... | 03/18/1986 |
| 4553474 | Aircraft cabin pressurization system This invention controls the air pressure in an aircraft cabin in response to a selected landing field altitude and to a selected maximum permissible cabin pressure rate.... | 11/19/1985 |
| 4543757 | Post support and protector A post support and protector includes a pair of members having first portions for attachment to a post and second portion for anchoring within the earth.... | 10/01/1985 |
| 4435664 | Magnetic interpole apparatus for improving commutation characteristics of a dynamoelectric machine An interpole for a direct current dynamoelectric machine is provided at the tip thereof with a flux shift winding, or windings, to effect a shifted magnetic flux strength to counteract induced voltages of the commutated armature coils moving through the c... | 03/06/1984 |
| 4414631 | Brake control system The discharge of a capacitor energizes a relay to actuate the dump valve of a braking system to interrupt braking action upon the occurrence of wheel slide.... | 11/08/1983 |
| 4357655 | Three-phase inverter A pulse width modulated three-phase inverter has notches in the output waveforms to control the harmonic content thereof.... | 11/02/1982 |
| 4337615 | Gas turbine fuel control system An electronic fuel control system for varying the fuel flow to a gas turbine engine during the engine's acceleration. The reference speed set point of the engine's fuel controlling governor is increased as a function of the elapsed time from engine start-... | 07/06/1982 |
