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1. CA2348274 - ELECTRO-OPTIC VOLTAGE SENSOR

Office Canada
Application Number 2348274
Application Date 31.08.1999
Publication Number 2348274
Publication Date 09.03.2000
Grant Number
Grant Date 12.07.2005
Publication Kind C
IPC
G01R 31/00
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
31Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
G01R 1/07
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
1Details of instruments or arrangements of the types covered by groups G01R5/-G01R13/122
02General constructional details
06Measuring leads; Measuring probes
067Measuring probes
07Non contact-making probes
G01R 15/24
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
15Details of measuring arrangements of the types provided for in groups G01R17/-G01R29/, G01R33/-G01R33/26176
14Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
24using light-modulating devices
G02F 1/01
GPHYSICS
02OPTICS
FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
01for the control of the intensity, phase, polarisation or colour
CPC
G01R 15/242
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
15Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00 and G01R33/00 - G01R35/00
14Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
24using light-modulating devices
241using electro-optical modulators, e.g. electro-absorption
242based on the Pockels effect, i.e. linear electro-optic effect
G01R 1/071
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
1Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
02General constructional details
06Measuring leads; Measuring probes
067Measuring probes
07Non-contact-making probes
071containing electro-optic elements
Applicants LOCKHEED MARTIN IDAHO TECHNOLOGIES COMPANY
Inventors DAVIDSON, JAMES R.
CRAWFORD, THOMAS M.
SEIFERT, GARY D.
Priority Data 60/098,794 01.09.1998 US
Title
(EN) ELECTRO-OPTIC VOLTAGE SENSOR
(FR) CAPTEUR DE TENSION ELECTRO-OPTIQUE
Abstract
(EN)
An electro-optic voltage sensor system includes a sensor (40) disposed in an E- field, a transmitter (34) for producing the electro-magnetic beam, detectors (162, 164) for converting the two beams into electrical signals and a signal processor (174) for determining the voltage. The sensor (40) receives a source beam (38) and includes a polarization beam displacer (80) for separating the source light beam (38) into two beams with orthogonal linear polarizations, a wave plate (104) for rotating the linear polarization to rotated polarization, a transducer (114) utilizing pockels electro-optic effect for inducing a differential phase shift on the major and minor axes of the rotated polarization in response to the E-field, a prism (130) for redirecting the beam back through the transducer (114) and also converts the rotated polarization to circular or elliptical polarization.