Self-compensating focs and other chemical sensors

Details Self-compensating focs and other chemical sensors Self-compensating focs and other chemical sensors

G - Physics

01

N

G01N 21/76 (2006.01) G01N 21/64 (2006.01) G01J 3/427 (2006.01)

Patent

CA 2089649

2089649 9204618 PCTABS00011 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 phosphorence, 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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