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Voltage detector using electro-optic material and interference of light beams

  • US 4,864,220 A
  • Filed: 07/12/1988
  • Issued: 09/05/1989
  • Est. Priority Date: 07/13/1987
  • Status: Expired due to Fees
First Claim
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1. A voltage detector for detecting a voltage developing in a selected area of an object to be measured, comprising:

  • a light source for emitting a light beam;

    a first optical path including first reflection means and a first electro-optic material for sensing said voltage developing in said object as a change in a refractive index thereof;

    a second optical path including second reflection means;

    splitting means for splitting said light beam introduced from said light source into a first light beam going along said first optical path and a second light beam going along said second optical path, causing return first and second light beams reflected from said respective first and second reflection means to interfere with each other, and extracting an output interference light beam; and

    detection means for determining said voltage developing in said selected area of said object on the basis of intensity of said received output interference light beam.

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