Class 73/514.27 - Frequency or phase shift

Subclass of Class 73 - Measuring and testing
Definition: Subject matter wherein the modification of the light beam
No. of patents: 33
Last issue date: 09/14/2010

Number	Title	Issue Date
7793543	Method of measuring borehole gravitational acceleration A sensor adapted for measuring acceleration, the sensor including a light source for illuminating an optical cavity; the optical cavity oriented for receiving light from the source, the optical cavity comprising a quality factor greater than or equal to about 10,000...	09/14/2010
7369248	Device for measuring an optical path length difference In measuring an optical path length difference, light from a light source is guided through a first and a second path. A three-way coupler combines light from the first and the second path in at least three combination, with at least three mutually different added r...	05/06/2008
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
7137299	Fiber optic accelerometer A proof mass is suspended in a cavity in a housing. The proof mass moves along a sensing axis in response to linear acceleration. Elastic support members are connected between the proof mass and the housing and are arranged to exert a reaction force on the proof mas...	11/21/2006
7139446	Compact fiber optic geometry for a counter-chirp FMCW coherent laser radar This disclosure presents a non-contact precision optical device, including methods for measuring distances to an arbitrary target and various configuration geometries, for using polarization maintaining (PM) optical fiber components in a polarization diplexing schem...	11/21/2006
7021146	Attitude sensor The present invention provides an attitude sensing device and method for determining an attitude of a reference axis of a package containing a fiber optic sensor sensor. The attitude sensing device comprises an electro-mechanical attitude sensor for generating an el...	04/04/2006
6891621	Highly sensitive cross axis accelerometer A highly sensitive accelerometer for determining the acceleration of a structure includes a mass within a housing rotationally supported by a hinge and opposing support members. The support members are alternately wound around a fixed mandrel and the mass in a pendu...	05/10/2005
6886404	Fiber optic accelerometer An acceleration transducer for use in an accelerometer includes a proof mass that comprises a transmissive optics device arranged to receive an optical signal such that the optical signal propagates through the transmissive optics device along a first optical path h...	05/03/2005
6779402	Method and apparatus for measuring acceleration using a fiber optic accelerometer A system and method for measuring acceleration using a fiber optic accelerometer having a pair of fiber optic coils positioned around a deformable support structure. The support structure possesses a nominally cylindrical shape with the fiber optic coils being wound...	08/24/2004
6567174	Optical accelerometer and its use to measure acceleration A method for measuring acceleration uses an accelerometer apparatus having an optically transparent, stress-birefringent material, a source of polarized light positioned to direct a polarized beam of light into the optically transparent, stress-birefringe...	05/20/2003
6422077	Ultrananocrystalline diamond cantilever wide dynamic range acceleration/vibration/pressure sensor An ultrananocrystalline diamond (UNCD) element formed in a cantilever configuration is used in a highly sensitive, ultra-small sensor for measuring acceleration, shock, vibration and static pressure over a wide dynamic range. The cantilever UNCD element m...	07/23/2002
6175108	Accelerometer featuring fiber optic bragg grating sensor for providing multiplexed multi-axis acceleration sensing An accelerometer has a main body in combination with one or more Bragg grating sensors respectively arranged along one or more axes. The main body has a mass that responds to an acceleration, for providing a force having a component in one or more axes. T...	01/16/2001
4900918	Resonant fiber optic accelerometer with noise reduction using a closed loop feedback to vary pathlength A pair of resonant optical cavities are used to measure shifts in length of a beam which deflects under acceleration. One end of each optical cavity is highly reflective and the other end partially reflective, thus permitting resonating light to exit the ...	02/13/1990
4900919	Wide bandwidth fiber optic accelerometer A vibration sensor 24 is disclosed which uses a piezoelectric crystal 26 to electrically modulate the phase of a laser beam using a phase modulator 28 producing a linearly phase modulated light beam. A DC bias can be provided by a battery 60 while a photo...	02/13/1990
4874942	Rotation, acceleration, and gravity sensors using quantum-mechanical matter-wave interferometry with neutral atoms and molecules The invention is a neutral atom (and/or molecule) matter-wave interferometer (and/or set of interferometers) that can be used as an inertial sensor with a sensitivity exceeding that of conventional mechanical sensors and multiple circuit optical interfero...	10/17/1989
4841774	Laser accelerometer The apparatus of this invention uses a two-branched linear gas laser having two end mirrors and a third mirror positioned at a bend in the two-branched laser cavity. The laser cavity is bent through an angle, θ, usually ninety degrees. With a bent cavity...	06/27/1989
4829821	Optical fiber accelerometer A first optical fiber coil (A) is disposed adjacent one end of a housing (40). The housing defines an interior reservoir (44) which contains a material (B) having substantial mass, preferably a dense fluid. A second optical fiber coil (C) is mounted to th...	05/16/1989
4815321	Movement sensing An alternative form of accelerometer is described herein in which an acceleration sensitive element (68, 69) is coupled to a deformable reflector (60) in a lasing cavity (58) to vary the radius of curvature of the reflector in response to experienced acce...	03/28/1989
4739661	Fiber-optic accelerometer having cantilevered acceleration-sensitive mass An optical fiber accelerometer with a rectilinear actuator, such as a push rod, acting on a middle region of an optical fiber pass tautly strung between two supports so that linear actuator motion during sensed acceleration causes lateral displacement of ...	04/26/1988
4671113	Fiber optic accelerometer First and second coils (A, B) of optical fibers are disposed adjacent opposite ends of a housing (40). The housing defines an interior reservoir which contains a material (C) having substantial mass. Preferably, the material is a dense fluid such as mercu...	06/09/1987
4648274	Photoelastic measuring transducer and accelerometer based thereon A photoelastic transducer is constructed with a photoelastic element receiving a 45° polarized light beam with a wave plate providing a 90° phase displacement in its orthogonal components. The element has reflective surface coatings to produce multiple ...	03/10/1987
4637255	Non-planar ring laser accelerometer An instrument for measuring acceleration as a function of reciprocal mode splitting within a non-planar rising cavity. A glass block includes an internal non-planar cavity. The block includes orthogonal bending axes. A proofmass atop the block causes flex...	01/20/1987
4635482	Sagnac phase detection passive laser accelerometer In a Sagnac-type of laser accelerometer, a common waveguide transducing element has oppositely rotating optical beams therein which are subsequently combined in a detection circuit to provide an output indicative of acceleration perpendicular to the plane...	01/13/1987
4613752	Fiber optic force measuring device A force measuring device generally comprising a hollow, three-dimensional container defining interiorly thereof at least one chamber is disclosed. The device includes at least a pair of optical fiber coils with the length of the optical fiber on each of t...	09/23/1986
4454418	Integrated optics transducer A transducer utilizes a laser source, photoelastic waveguides, two optical beam paths and detectors for processing optical energy from the laser through a stress transfer medium and thereby detects stress forces present on the transducer. This allows forc...	06/12/1984
4452531	Method and means of determining acceleration A method and apparatus having a frequency transmitter, a frequency receiver, an oscillator tuned to the same frequency as the frequency transmitter, and a frequency differential measuring unit to measure frequency changes between emitted signals to determ...	06/05/1984
4429573	Common resonator passive laser accelerometer and gyro A dual function device measures both inertial acceleration and rotation rate using a common birefringent ring resonator. A beam from a laser source is split, forming two orthogonally polarized beams which are coupled through respective Bragg cells and int...	02/07/1984
4428234	Phase detection laser accelerometer An accelerometer utilizes a laser source, a photoelastic waveguide, a plurality of optical beam paths and detectors for processing optical output energy from the laser along two or more paths for providing phase detection for measuring acceleration. An el...	01/31/1984
4422331	Phase modulator laser accelerometer A laser accelerometer produces an output, phase modulated beam which is polarized in a direction perpendicular to the direction from which acceleration forces are applied. In the accelerometer a laser beam is directed through a resonant cavity toward a de...	12/27/1983
4315693	Optical strapdown inertia system An optical strapdown inertial system using passive laser gyros and passive laser accelerometers and a computer. These components may be disposed on "chips" in integrated optics format to provide an all solid-state system having no moving parts....	02/16/1982
4233847	Passive laser accelerometer An accelerometer utilizing a laser source and a resonant cavity formed by a pair of spaced mirrors. A birefringent isotropic material is disposed in the resonant cavity. Light generated by the laser is reflected back and forth between the mirrors and thro...	11/18/1980
4155251	Laser force-measuring system biasing A biasing element for use in a force-measuring system employing a circularly polarized ring laser. The biasing element is a pre-stressed photoelastic element placed in the path of the laser beam to generate a steadystate frequency difference at the output...	05/22/1979
4048859	Laser accelerometer An optical element formed of birefringent material is placed in the resonant optical beam path of a gas laser. A proof mass is fixedly attached to the birefringent element to form an integral unit therewith, this unit being contained within the same chamb...	09/20/1977

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Class 73/514.27 - Frequency or phase shift