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Fiber optics gas sensor

  • US 5,436,167 A
  • Filed: 04/13/1993
  • Issued: 07/25/1995
  • Est. Priority Date: 04/13/1993
  • Status: Expired due to Fees
First Claim
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1. An apparatus for detecting the presence of a gas for use with a source of elliptically polarized light, comprising:

  • an optical waveguide having a circumference; and

    a transparent variable index means deposited in a layer over at least a portion of the circumference of said optical waveguide for exchanging electrons with a gas to be detected at reactive sites on the surface of said variable index means by the process of adsorption, thereby varying the refractive index of said variable index means and altering the ellipticity of a light transmitted through the optical waveguide as a function of the presence of said gas.

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