Apparatus for monitoring a chemical concentration
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United States of America Patent
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Apr 7, 1992
Grant Date -
N/A
app pub date -
Feb 16, 1990
filing date -
Feb 16, 1990
priority date (Note) -
Expired
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Abstract
A sensor for monitoring a condition such as a chemical concentration includes two luminescent materials having differing absorption bands and differing sensitivities to the condition to be monitored. Light in the two absorption bands is applied in alternating sequence so as to elicit emissions from the two luminescent materials in alternating sequence. These emissions are compared to one another and the relationship between them, such as the ratio of their intensities, indicates the condition. The luminescent materials may be porphyrins or derivatives thereof.
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