Method of self-compensating a fiber optic chemical sensor
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United States of America Patent
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Mar 10, 1992
Grant Date -
N/A
app pub date -
Aug 30, 1990
filing date -
Aug 30, 1990
priority date (Note) -
Expired
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Abstract
A chemical sensor, such as a fiber optic chemical sensor, is self-calibrated by measuring two output values which behave differently in response to an analyte, and forming a ratio between the two measured output values to cancel out effects of variations in external factors such as temperature variations, differences between coatings, light (illuminator) variations, fouling, bleaching, leaching or the like. An indicator material may be used which produces both fluorescence and phosphorescence, both monomer and aggregate emission or absorption bands, emission or absorption bands with or without an isosbestic point, emission peaks at one wavelength at two different excitation bands, or emission peaks at two wavelengths for excitation at two wavelengths.
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