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Stable fiber-optic hydrophone

  • US 4,525,818 A
  • Filed: 07/28/1982
  • Issued: 06/25/1985
  • Est. Priority Date: 08/09/1979
  • Status: Expired due to Fees
First Claim
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1. An optical fiber hydrophone system adapted to process variations in local acoustical pressure in a fluid body and provide an identifiable output signal, comprising:

  • signal source and detecting means for providing an optical signal in a selected form, and for detecting and extracting said indentifiable output signal;

    a single optical fiber connected at one end to said source and detecting means and operable for conducting optical signals from said source and to said detecting means;

    a sensing means in said optical fiber remote from said source and detecting means, said sensing means being adapted for immersion in said body and including two optical reflector means incorporated into said fiber and spaced one from the other by a predetermined length of said optical fiber, at least one of said reflector means being partially reflective and partially transmissive, said variations in acoustical pressure incident on said sensing portion causing a change in said predetermined length thereof and thus a phase and intensity modulation in the portion of said optical signal reflected back and forth between said two optical reflector means and,means connected to said source and detecting means for processing the intensity modulated optical signal transmitted back to said source and detecting means in said optical fiber for extraction therefrom of said identifiable output signal.

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