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Fiber-optic gyro

  • US 4,621,925 A
  • Filed: 09/20/1983
  • Issued: 11/11/1986
  • Est. Priority Date: 11/11/1982
  • Status: Expired due to Fees
First Claim
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1. A fiber-optic gyro comprisinga laser diode,a light detector,a half-mirror,first and second lenses arranged on both sides of said half-mirror, andfirst and second optical fibers each having two ends, a respective first of said ends of each of said fibers being aligned with a respective end of the other fiber, and said half-mirror being interposed between said aligned ends,a third optical fiber having two ends, said third optical fiber being arranged in a coil and so that said two ends are arranged to be parallel to respective portions of said first ends of the first and second optical fibers,wherein light from the laser diode is incident on the half-mirror through the first lens to produce two light beams, the first of said light beam being reflected from the half-mirror and incident on a first one of said ends of the third optical fiber through the first lens, and the second light beam being transmitted through the half-mirror and incident on the other end of the third optical fiber through the second lens, so that said light beams are propagated through the third optical fiber in opposite directions, andmeans for synthesizing the light beams from the third optical fiber into a combined beam that is incident on the light detector,wherein the speed of the rotation angle is detector by the output of the light detector.

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