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Microbend optic sensor with fiber being sewn thereto in a sinuously looped disposition

  • US 5,134,281 A
  • Filed: 12/21/1990
  • Issued: 07/28/1992
  • Est. Priority Date: 01/31/1990
  • Status: Expired due to Fees
First Claim
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1. An optical sensor comprising an optical fiber having a core covered by a cladding, the cladding having an index of refraction different from that of the core, means for retaining the fiber in a sinuously looped disposition, means for fixing the fiber and retaining means to an object to be sensed whereby movement to be sensed results in one or both of accordion expansion and contraction of loops of the fiber and microbending of the fiber, the retaining means being comprised of an elastic cloth strip, the fiber being sewn thereto in said sinuously looped disposition, means for applying a first optical signal into one end of the fiber, means for detecting a resulting optical signal from he other end of the fiber, means for comparing the first and resulting optical signals to obtain an indication of said movement, the fiber being loped back upon itself so as to form a first portion and a looped-back portion, both portions of the fiber being disposed so as to follow the same path.

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