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High accuracy and high sensitivity environmental fiber optic sensor with corrugations

  • US 5,324,933 A
  • Filed: 06/21/1993
  • Issued: 06/28/1994
  • Est. Priority Date: 06/21/1993
  • Status: Expired due to Fees
First Claim
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1. An apparatus for detecting presence of a measurand, comprising:

  • a fiber field access block;

    a corrugated measurand sensitive layer over said fiber field access block; and

    means for detecting changes in a parameter selected from the group of thickness and index of refraction of said measurand sensitive layer caused by interaction with said measurand; and

    wherein said fiber field access block has a clad fiber positioned such that a portion of said clad fiber is exposed to said measurand sensitive layer and any cladding on said portion of said clad fiber is thinner than required to prevent an evanescent wave from escaping said clad fiber.

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