Fiber optic pH sensor having low drift rate
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United States of America Patent
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Jan 31, 1989
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N/A
app pub date -
Aug 20, 1987
filing date -
Jun 21, 1985
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Expired
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Abstract
A hydrolyzed dye/gel polymer for use in a pH-based sensor is characterized by its chemical and optical stability with respect to dye loss with time. Preferably, the dye/gel polymer is hydrolyzed by heating in a dilute base solution for a period of time sufficient to remove weakly bonded dye molecules from the polymer, then washed to remove the base solution and loose dye.
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