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Optoelectronics system for measuring environmental properties having plural feedback detectors

  • US 4,760,250 A
  • Filed: 09/29/1986
  • Issued: 07/26/1988
  • Est. Priority Date: 09/29/1986
  • Status: Expired due to Term
First Claim
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1. A system for measuring at least one property of an environment comprising:

  • a first light source for generating light at a first wavelength;

    first feedback means coupled to the first light source for maintaining the light from the first light source at a substantially constant level even as components age and thermal conditions vary;

    a second light source for generating light at a second wavelength;

    second feedback means coupled to the second light source for maintaining the light from the second light source at a substantially constant level even as components age and thermal conditions vary;

    a sensor to be placed in an environment, the sensor being responsive to a change in a property of the environment, the sensor generating first and second optical output signals representing a change in the light from the first and second light sources, respectively, due to a property of the environment;

    means for transmitting light from the first and second light sources to the sensor;

    a detector for detecting the first and second optical output signals;

    means for transmitting the first and second optical output signals from the sensor to the detector; and

    computation means coupled to the detector for determining the value of the property of the environment from the first and second optical output signals.

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