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Optical fibre sensing arrangements

  • US 4,638,153 A
  • Filed: 05/18/1984
  • Issued: 01/20/1987
  • Est. Priority Date: 05/26/1983
  • Status: Expired due to Fees
First Claim
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1. An optical arrangement suitable for the detection of acoustic waves and/or temperature or magnetic field changes, comprising means for producing polarised light which in operation of the arrangement will be applied for detection purposes to the input end of an optical sensor for transmission therethrough, whereby a relative phase delay is produced between orthogonal components of the polarised light at the output end of the optical sensor, and relative phase delay compensation means optically coupled to and so orientated with respect to one end of the sensor, that the relative phase delay between the orthogonally polarised components transmitted through the compensation means and the corresponding relative phase delay in the optical sensor are mutually opposite, thereby reducing the noise content of an output signal derived from the arrangement and fed to polarisation analyser means for producing an indication of structural changes which have occurred in the optical sensor.

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