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Fluid detection system

  • US 5,452,076 A
  • Filed: 09/29/1993
  • Issued: 09/19/1995
  • Est. Priority Date: 09/29/1993
  • Status: Expired due to Fees
First Claim
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1. A fluid sensor system for identifying fluids having different refractive indices, comprising:

  • (a) a light source for producing light pulses;

    (b) a light detector having a predetermined threshold intensity, the detector further having an indication of whether a detected light pulse has an intensity below or above the threshold intensity;

    (c) a light transmitting probe for transmitting light pulses from the source to the detector, the probe having a first end in optical communication with the source to receive light pulses therefrom, an intermediate region in contact with a fluid to be identified, and a second end in optical communication with the detector to transmit light pulses thereto, the intermediate region having a property responsive to the index of refraction of the contacting fluid so that light pulses transmitted through the intermediate region are attenuated in proportion to the index of refraction of the fluid;

    (d) means for varying the intensity of light pulses produced by the light source to adjust the intensity of the emitted light pulses to an intensity level corresponding to the detector threshold intensity.

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