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Temperature measurement and compensation in a fiber-optic sensor

  • US 5,115,811 A
  • Filed: 04/30/1990
  • Issued: 05/26/1992
  • Est. Priority Date: 04/30/1990
  • Status: Expired due to Term
First Claim
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1. Apparatus for measuring a parameter of a test fluid comprising:

  • a catheter including a sensor incorporating a dye which displays changes in light absorption properties correlated to changes in the parameter to be measured and in correlation to changes in temperature;

    means for applying first, second and third wavelengths of light to said sensor, said first wavelength chosen such that said absorptive characteristics of said sensor at said first wavelength do not change significantly with changes in said parameter to be measured, said second and third wavelengths chosen such that the absorptive characteristics of said sensor at both said second and third wavelengths do change in response to both changes in temperature and changes in said parameter to be measured; and

    means for measuring light reflected from said sensor at said first, second and third wavelengths to provide a temperature corrected measurement of said parameter to be measured.

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