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Methods and apparatus for measuring multiple Fabry-Perot gaps

  • US 8,115,937 B2
  • Filed: 08/16/2007
  • Issued: 02/14/2012
  • Est. Priority Date: 08/16/2006
  • Status: Active Grant
First Claim
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1. A system for measuring environmental parameters comprising:

  • an optical fiber;

    a first reflective surface positioned proximate to a first end of the optical fiber;

    a space between the first end of the optical fiber and the first reflective surface;

    a second reflective surface spaced apart from the first reflective surface;

    a solid substrate having a thermally sensitive refractive index positioned between the first reflective surface and the second reflective surface to form a first temperature sensitive Fabry-Perot gap between the first reflective surface and the second reflective surface;

    a diaphragm;

    a third reflective surface connected to a surface of the diaphragm to form a second pressure sensitive Fabry-Perot gap between the second reflective surface and third reflective surface; and

    a first light source providing light to the optical fiber, wherein the optical fiber delivers light from the first light source to the first Fabry-Perot gap and the second Fabry-Perot gap and the optical fiber receives reflected light from the first Fabry-Perot gap and the second Fabry-Perot gap.

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