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Title: Electro-optic voltage sensor head

Abstract

The invention is an electro-optic voltage sensor head designed for integration with existing types of high voltage transmission and distribution apparatus. The sensor head contains a transducer, which comprises a transducing material in which the Pockels electro-optic effect is observed. In the practice of the invention at least one beam of electromagnetic radiation is routed into the transducing material of the transducer in the sensor head. The beam undergoes an electro-optic effect in the sensor head when the transducing material is subjected to an E-field. The electro-optic effect is observed as a differential phase a shift, also called differential phase modulation, of the beam components in orthogonal planes of the electromagnetic radiation. In the preferred embodiment the beam is routed through the transducer along an initial axis and then reflected by a retro-reflector back substantially parallel to the initial axis, making a double pass through the transducer for increased measurement sensitivity. The preferred embodiment of the sensor head also includes a polarization state rotator and at least one beam splitter for orienting the beam along major and minor axes and for splitting the beam components into two signals which are independent converse amplitude-modulated signals carrying E-field magnitude and hence voltagemore » information from the sensor head by way of optic fibers.« less

Inventors:
 [1];  [1];  [2]
  1. Idaho Falls, ID
  2. Cornelius, OR
Issue Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
OSTI Identifier:
872457
Patent Number(s):
5939711
Assignee:
Lockheed Martin Idaho Technologies Company (Idaho Falls, ID)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01R - MEASURING ELECTRIC VARIABLES
G - PHYSICS G02 - OPTICS G02F - DEVICES 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
DOE Contract Number:  
AC07-94ID13223
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
electro-optic; voltage; sensor; head; designed; integration; existing; types; transmission; distribution; apparatus; contains; transducer; comprises; transducing; material; pockels; effect; observed; practice; beam; electromagnetic; radiation; routed; undergoes; subjected; e-field; differential; phase; shift; called; modulation; components; orthogonal; planes; preferred; embodiment; initial; axis; reflected; retro-reflector; substantially; parallel; double; pass; increased; measurement; sensitivity; polarization; rotator; splitter; orienting; major; minor; axes; splitting; signals; independent; converse; amplitude-modulated; carrying; magnitude; hence; information; optic; fibers; electro-optic voltage; voltage sensor; modulated signal; optic fiber; beam splitter; electromagnetic radiation; preferred embodiment; substantially parallel; electro-optic effect; optic fibers; phase modulation; sensor head; voltage transmission; orthogonal planes; differential phase; beam components; beam undergoes; pockels electro-optic; field magnitude; optic voltage; distribution apparatus; /250/324/385/

Citation Formats

Crawford, Thomas M, Davidson, James R, and Woods, Gregory K. Electro-optic voltage sensor head. United States: N. p., 1999. Web.
Crawford, Thomas M, Davidson, James R, & Woods, Gregory K. Electro-optic voltage sensor head. United States.
Crawford, Thomas M, Davidson, James R, and Woods, Gregory K. Fri . "Electro-optic voltage sensor head". United States. https://www.osti.gov/servlets/purl/872457.
@article{osti_872457,
title = {Electro-optic voltage sensor head},
author = {Crawford, Thomas M and Davidson, James R and Woods, Gregory K},
abstractNote = {The invention is an electro-optic voltage sensor head designed for integration with existing types of high voltage transmission and distribution apparatus. The sensor head contains a transducer, which comprises a transducing material in which the Pockels electro-optic effect is observed. In the practice of the invention at least one beam of electromagnetic radiation is routed into the transducing material of the transducer in the sensor head. The beam undergoes an electro-optic effect in the sensor head when the transducing material is subjected to an E-field. The electro-optic effect is observed as a differential phase a shift, also called differential phase modulation, of the beam components in orthogonal planes of the electromagnetic radiation. In the preferred embodiment the beam is routed through the transducer along an initial axis and then reflected by a retro-reflector back substantially parallel to the initial axis, making a double pass through the transducer for increased measurement sensitivity. The preferred embodiment of the sensor head also includes a polarization state rotator and at least one beam splitter for orienting the beam along major and minor axes and for splitting the beam components into two signals which are independent converse amplitude-modulated signals carrying E-field magnitude and hence voltage information from the sensor head by way of optic fibers.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {1}
}

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Works referenced in this record:

Modifications of optical fiber voltage sensor
conference, January 1990