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Fiber optic sensors for simultaneously detecting different parameters in a single sensing tip

  • US 4,523,092 A
  • Filed: 07/29/1982
  • Issued: 06/11/1985
  • Est. Priority Date: 07/29/1982
  • Status: Expired due to Fees
First Claim
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1. A sensor system for simultaneously sensing at least two different parameters and utilizing selective absorption of a plurality of frequencies by different optical layers comprising:

  • an optical fiber;

    means for applying radiation of a plurality of optical frequencies to said fiber;

    said optical fiber having a termination operative to reflect said radiation of plural frequencies back through said optical fiber;

    said termination including at least two contiguous and sequential semiconductor layers each having an optical absorption curve at a distinct wavelength wherein the absorption is a function of a parameter being sensed; and

    means responsive to reflected radiation in said fiber for analyzing the reflected radiation at said plurality of frequencies to provide an indication of the value of the respective parameters.

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