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Class 356/482 - For distance or displacement measurement


Subclass of Class 356 - Optics: measuring and testing
Definition: Fiber or waveguide interferometer wherein the fiber interferometer
No. of patents: 132
Last issue date: 05/07/2013


1        
NumberTitleIssue Date
8437006Displacement sensor with embedded coherent electromagnetic radiation interferometer for micro scale proximity measurements
The present invention is an interferometer sensor which uses frequency modulated coherent electromagnetic radiation to noncontact measure the displacement of moving targets with high precision. The sensor has an embedded interferometer comprised of an electromagneti...
05/07/2013
8194253Fiber optic sensor head and interferometric measuring system
A fiber optic sensor head for detecting the shape or the distance of a test object has an optical fiber, in particular a glass fiber, for conducting and returning partial beams to and from the test object, and an injection/extraction lens on the test object side. Fo...
06/05/2012
8144334Fiber-optic, digital system for laser Doppler vibrometers (LDVs)
An apparatus and method for non-determination of the surface velocity of a target using optical interference and Doppler shifting of the light reflected from the target are disclosed. It may be used to measure small-amplitude, acoustic frequency surface vibrations a...
03/27/2012
8120780Laser-based coordinate measuring device and laser-based method for measuring coordinates
A laser based coordinate measuring device measures a position of a remote target. The laser based coordinate measuring device includes a stationary portion, a rotatable portion, and at least a first optical fiber. The stationary portion has at least a first laser ra...
02/21/2012
8102537Optical displacement gage
An optical displacement gage includes the phase determining unit includes a relative phase deciding unit to decide a relative phase of the frequency component within a range of 360 degrees, an absolute phase computing unit to compute an absolute phase by combining t...
01/24/2012
8040525Laser tracker including a locator camera
A laser tracker includes a first optical system located on a structure and that launches a beam from the structure. The laser tracker also includes a locator camera having a second optical system that includes a lens having a center and a clear aperture through whic...
10/18/2011
7859681Pressure transmitter for detection of a variable relative to a process fluid
A pressure transmitter for detection of a physical variable relative to a process fluid, comprising: a first and a second pressure-sensitive membrane suitable for interfacing with said process fluid; a pressure sensor having a supporting body provided with a cavity ...
12/28/2010
7800758Laser-based coordinate measuring device and laser-based method for measuring coordinates
A laser based coordinate measuring device measures a position of a remote target. The laser based coordinate measuring device includes a stationary portion, a rotatable portion, and at least a first optical fiber. The stationary portion has at least a first laser ra...
09/21/2010
7738110Displacement sensor based on photonic crystal waveguides
A displacement sensor comprising at least one pair of co-planar photonic crystal waveguide (PCWG) sections aligned along or parallel to a common axis and separated by a gap, one PCWG section of a pair operative to perform a displacement relative to the other section...
06/15/2010
7719690Optical inclination sensor
An optical inclination sensor is provided having at least one reflective surface and at least two separate optical fibers having ends spaced from a reflective surface. As the reflective surface tilts with respect to a pre-determined reference position the gap length...
05/18/2010
7532329Fiber optic interferometric position sensor and measurement method thereof
A fiber optic interferometric position sensor and measurement method thereof suitable for determining the moving direction of a measurement object in an environment of high electric or magnetic field strengths are disclosed. The fiber optic interferometric position ...
05/12/2009
7518731Interferometric MOEMS sensor
The present invention relates to an optical interferometric apparatus and method for measuring acceleration, pressure, and pressure of fluids during flow using micro-opto-electro-mechanical-systems (MOEMS). The high-sensitivity and high-resolution apparatus includes...
04/14/2009
7515275Optical apparatus and method for distance measuring
An optical sensor for determining a distance between a target and a probe head is described. The optical sensor comprises a light source delivering a broadband spectrum; a fiber-optic Michelson interferometer (FOMI) for creating an interferogram; and an analyzer uni...
04/07/2009
7466424Displacement sensor based on photonic crystal waveguides
A displacement sensor comprising at least one pair of co-planar photonic crystal waveguide (PCWG) sections aligned along or parallel to a common axis and separated by a gap, one PCWG section of a pair operative to perform a displacement relative to the other section...
12/16/2008
7411171Circuit for analyzing a signal reflected from an object
In a circuit arrangement for analyzing a clocked signal reflected from an object, particularly an optical signal, wherein at least one radiation emitter which, for providing the clocked signal, is connected to a clocking signal generator, and at least one radiation ...
08/12/2008
7403288Method and apparatus for measuring thickness of thin article
An apparatus (100) for measuring a thickness of a thin article according to an embodiment of the present apparatus is provided. The apparatus includes an optical fiber interferometer (101), a signal processor module (102) and a measuring module ...
07/22/2008
7400410Optical coherence tomography for eye-length measurement
An accurate measure of eye length can be obtained using concurrent OCT measurements. A position OCT device can be used to continually monitor the position of the front surface of the cornea, while a distance OCT device can determine the apparent distance between the...
07/15/2008
7365860System capable of determining applied and anodized coating thickness of a coated-anodized product
A system for forming an anodized coating on at least a portion of a substrate thereby creating an anodized substrate is disclosed. The system includes a bath, a coating thickness monitor, at least one probe and at least one controller. The coating thickness monitor ...
04/29/2008
7349099Fiber optic interferometric position sensor and measurement method thereof
A fiber optic interferometric position sensor and measurement method thereof suitable for determining the moving direction of a measurement object in an environment of high electric or magnetic field strengths are disclosed. The fiber optic interferometric position ...
03/25/2008
7339679Interferometric measuring device utilizing a slanted probe filter
An interferometric measuring device for recording shape, roughness or separation distance of the surface of a measuring object, having a modulating interferometer, to which is supplied short coherent radiation by a radiation source, having a measuring probe that is ...
03/04/2008
7315380Laser interferometer for repeatable mounting on the wall of a vacuum chamber
A laser interferometer is disclosed comprising a housing capable of being substantially repeatably mounted to a wall of an environmental chamber, the housing including a laser source, a reflector attached to an object located within the environmental chamber, and a ...
01/01/2008
7292347Dual laser high precision interferometer
An absolute distance measuring device based on laser interferometry may combine coarse, intermediate, and highest resolution measurement techniques to find the absolute distance to a sample surface with high resolution. The device may provide at least two laser wave...
11/06/2007
7281428Diagnostic system for monitoring structural health conditions
Interrogation systems for monitoring structural health conditions. An interrogation system includes at least one wave generator for generating a wave signal and optical fiber sensors applied to a structure. The interrogation system also includes at least one electro...
10/16/2007
7281413Acoustic method for determining the viscosity and/or surface tension of a liquid
The present invention comprises a noncontact method for measuring viscosity and/or surface tension information of a liquid in a liquid containment structure. The steps of the method include exciting a surface of the liquid with an excitation burst of acoustic energy...
10/16/2007
7280216Method and apparatus for determining the wavelength of an input light beam
A method and apparatus for measuring the wavelength of an input light beam whereby the input light beam is split into two light beams which are directed through two paths of different optical length. The light beams are interfered with each other in order to form a ...
10/09/2007
7262834Sensor for measuring velocity of vibration using light waveguide
This invention provides a device or method for measuring vibration with high sensitivity and over a wide bandwidth. A curved section is formed in an optical fiber. The curved section is disposed on a place to be measured. Light is input in the optical fiber, ...
08/28/2007
7259863Grating interference type optical encoder
A grating interference type optical encoder has a scale board, a diffraction grating located on the scale board, a light receiving element, an illumination optical system for emitting a coherent light fluxes to the diffraction grating on the scale board that relativ...
08/21/2007
7251040Single metal nanoparticle scattering interferometer
An interferometer and a method for generating scattered light interference are provided. A beam splitter is provided by a single metal nanoparticle to split an incoming excitation light. Scattered light from the single metal nanoparticle and its mirror image shows i...
07/31/2007
7215457Apparatus and methods for modulating refractive index
An iono-refractive structure that includes one or more ion insertion layers having a real portion and an imaginary portion of the dielectric constant is provided. While both the real portion and the imaginary portion of the dielectric constant change, the change in ...
05/08/2007
7206076Thickness measurement of moving webs and seal integrity system using dual interferometer
A system and method for measuring the thickness of materials and coatings across a moving length of material such as sheet, film, or web by the use of non-contact optical interferometry is provided. Also, a system and method for evaluating the seal integrity in flex...
04/17/2007
7197931Sensors for monitoring structural health conditions
Sensors and systems for monitoring structural health conditions. The present invention provides a device for monitoring structural health conditions including a dielectric substrate, a piezoelectric device for actuating and/or sensing Lamb waves, a molding layer dep...
04/03/2007
7187178Method for determining the voltage sensitivity of the distance between the mirrors of a fabry-perot interferometer
A method for determining the voltage sensitivity of the distance between the mirrors of a Fabry-Perot interferometer in a measuring device, which is intended to measure a predefined gas (CO2), of which at least one absorption maximum or minimum is known. At least tw...
03/06/2007
7158240Measurement device and method
Apparatus for determining the thickness of a configuration having flat, parallel surfaces that are transparent, or nearly so, to pre-specified types of energy. Embodiments comprise a mechanism for illuminating a front surface with an energy source and mechanisms for...
01/02/2007
7145709Apparatus and methods for modulating refractive index
An iono-refractive structure that includes one or more ion insertion layers having a real portion and an imaginary portion of the dielectric constant is provided. While both the real portion and the imaginary portion of the dielectric constant change, the change in ...
12/05/2006
7122818Optical displacement sensor using optical fiber, and external force detecting device
An optical displacement sensor is provided, in which an optical fiber is disposed between a light source and a light receiving means so that light emitted from the light source is conducted therethrough so as to be duly received by the light receiving means whereby ...
10/17/2006
7116430Highly-sensitive displacement-measuring optical device
The present invention relates to micron-scale displacement measurement devices. A first embodiment is a device that includes a substrate and a rigid structure suspended above the substrate to form a backside cavity. Formed in the rigid structure is a reflective diff...
10/03/2006
7068377System and method for surface profiling a target object
The present invention relates to microinterferometers and the application of such to profile surface geometries. A representative method for profiling a target surface of an object includes: illuminating the target surface with an incident light beam through a phase...
06/27/2006
7038793Sensor device for performing rapid optical measurement of distances according to the confocal optical imaging principle
A sensor device is for performing rapid optical measurement of distances according to the confocal optical imaging principle in order to determine distance values and/or height values of a surface. The sensor device includes a point-shaped light-emitting element tha...
05/02/2006
7030994Method and apparatus to measure fiber optic pickup errors in interferometry systems
Methods and apparatus for characterizing and compensating non-cyclic errors in fiber optic pickups in interferometry systems are disclosed. ...
04/18/2006
7016128Method of making a high reflectivity micro mirror and a micro mirror
A method of making a high reflectivity micro mirror. A first step involves providing a monolithic bulk crystal silicon having an anisotropic body with a crystalline plane. A second step involves applying chemical agents to selectively remove a portion of the body ov...
03/21/2006
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