Resources Contact Us Home
Browse by Category: Main > Electrical & Energy
Class Information
Number: 250/227.17
Name: Radiant energy > Photocells; circuits and apparatus > Optical or pre-photocell system > Light conductor > Condition responsive light guide (e.g., light guide is physically affected by parameter sensed which results in light conveyed to the photocell) > Causing polarization change in fiber
Description: Subject matter in which the condition sensed changes the polarization of the light passing through the fiber due to some parameter affecting the fiber so that light of a different polarization reaches the photodetector than was incident on the fiber.

Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8624579 Fiber optic current sensor Jan. 7, 2014
8461822 Temperature compensated fiber optic current or magnetic field sensor with insensitivity to variations in sensor parameters Jun. 11, 2013
8395372 Method for measuring current in an electric power distribution system Mar. 12, 2013
8373852 Optical waveguide rotator mechanism, birefringence-inducing element and polarization control devices employing either or both and methods of using same Feb. 12, 2013
8350211 Quantum entity state processing system and method having heterogeneously influenceable quantum entity secondary states and conditioned quantum entity tertiary states Jan. 8, 2013
8290316 Self-referenced optical fiber sensor and related sensor network Oct. 16, 2012
8260093 Component monitoring arrangement Sep. 4, 2012
8031988 Apparatus for pressure sensing Oct. 4, 2011
8027584 Sensing a disturbance Sep. 27, 2011
7973914 Physical quantity measuring apparatus utilizing optical frequency domain reflectometry and method for temperature and strain measurement using the apparatus Jul. 5, 2011
7889332 Physical quantity measuring apparatus utilizing optical frequency domain reflectometry, and method for simultaneous measurement of temperature and strain using the apparatus Feb. 15, 2011
7745778 Elliptical polarizers, tags and identification systems using frequency selective surfaces Jun. 29, 2010
7655900 Intensity modulation type optical sensor and optical current/voltage sensor Feb. 2, 2010
7642504 System and method for measuring forces Jan. 5, 2010
7629569 Elliptical polarizers, tags and identification systems using frequency selective surfaces Dec. 8, 2009
7526147 Sensor array for perimeter defense Apr. 28, 2009
7466929 Method and system for superheterodyne detection of an optical input signal Dec. 16, 2008
7376298 Optical rotating data transmission device with an unobstructed diameter May. 20, 2008
7373056 High-voltage component with optical fiber and method for producing it May. 13, 2008
7358858 Road-ice detecting sensor, method for installing same, and road-ice detecting method Apr. 15, 2008
7158275 Polarization modulator Jan. 2, 2007
7076122 Patch-type extrinsic Fabry-Perot interferometric fiber optic sensor and real-time structural vibration monitoring method using the same Jul. 11, 2006
6973223 Device for providing polarized light Dec. 6, 2005
6946646 Method of evaluating fiber PMD using polarization optical time domain reflectometry Sep. 20, 2005
6920411 Method for configuring an operational characteristic of a proximity sensor Jul. 19, 2005
6897434 All-fiber photon-pair source for quantum communications May. 24, 2005
6898339 Multiple mode pre-loadable fiber optic pressure and temperature sensor May. 24, 2005
6885782 Feedback polarization controller Apr. 26, 2005
6738145 Micromachined, etalon-based optical fiber pressure sensor May. 18, 2004
6727491 Sensor and method for detecting changes in distance Apr. 27, 2004
6703821 Faraday-effect current sensor with improved vibration response Mar. 9, 2004
6683447 Electro-optic apparatus for measuring signal potentials Jan. 27, 2004
6683297 Fiber grating moisture and chemical sensing system Jan. 27, 2004
6630658 Fiber laser pressure sensor Oct. 7, 2003
6521884 Distance measuring device with magneto-optical effect and measuring chain incorporating same Feb. 18, 2003
6515467 Method and system for optically detecting an electric current by means of light signals having different wavelengths Feb. 4, 2003
6507012 Method and apparatus for detecting malfunctions in communication systems Jan. 14, 2003
6498654 Optical proximity detector Dec. 24, 2002
6462856 Method and apparatus for modulating an optical signal using polarization Oct. 8, 2002
6456419 Frequency modulated liquid crystal beamsteering device Sep. 24, 2002
6388434 Electro-optic high voltage sensor May. 14, 2002
6380533 Method for measurement of first-and second-order polarization mode dispersion vectors in optical fibers Apr. 30, 2002
6307666 Voltage sensing systems and methods for passive compensation of temperature related intrinsic phase shift Oct. 23, 2001
6194706 Methods and systems for locating buried fiber optic cables Feb. 27, 2001
6188811 Fiber optic current sensor Feb. 13, 2001
6166372 Polarization detection device and method for producing the same Dec. 26, 2000
6147341 Temperature compensating device for fiber gratings Nov. 14, 2000
6144450 Apparatus and method for improving the accuracy of polarization mode dispersion measurements Nov. 7, 2000
6134281 Method and apparatus for calibration of a signal processing system utilizing digital down converters Oct. 17, 2000
6133721 Glass fiber current sensor and method of use therefor Oct. 17, 2000

1 2 3 4

  Recently Added Patents
Fixing device and image forming apparatus
Native NAD-dependent GAPDH replaced with NADP-dependent GAPDH plus NADK
Active constant power supply apparatus
Systems and methods for programming an RFID reader
Integrated monitoring in problem management in service desk
Methods and systems for sending messages regarding an emergency that occurred at a facility
Location estimation of wireless terminals through pattern matching of deduced signal strengths
  Randomly Featured Patents
Hydrocarbon composition
Object-based graphics system for displaying an image using explicit quadratic polynomial fragments
System and method for regulating cathode ray tube beam current using autobias
Water softener drain adaptor system
Process for sugar-coating solid preparation
Video and audio signal recording and/or reproducing apparatus
Semiconductor device employing grid array electrodes and compact chip-size package
Information processing apparatus and information processing program
Arrangement for performing position determination
Liver assist device employing transformed cell lines