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Method and apparatus for enhanced evanescent field exposure in an optical fiber resonator for spectroscopic detection and measurement of trace species

  • US 7,318,909 B2
  • Filed: 05/29/2002
  • Issued: 01/15/2008
  • Est. Priority Date: 12/12/2001
  • Status: Expired due to Fees
First Claim
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1. An apparatus for detection and measurement of trace species in at least one of a sample gas and a sample liquid comprising:

  • a closed passive optical fiber ring;

    at least one sensor in line with the optical fiber ring, the at least one sensor having a portion thereof exposed to the sample gas or sample liquid;

    a coherent source of radiation;

    coupling means for i) introducing a portion of the radiation emitted by the coherent source to the passive fiber optic ring and ii) receiving a portion of the radiation resonant in the passive fiber optic ring;

    a detector for detecting a level of the radiation received by the coupling means and generating a signal responsive thereto; and

    a processor coupled to the detector for determining a level of the trace species in the gas sample or liquid sample based on the signal generated by the detector.

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