Nondispersive optical monitor for nitrogen-oxygen compounds
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United States of America Patent
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Oct 6, 1998
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N/A
app pub date -
Dec 20, 1996
filing date -
Dec 20, 1996
priority date (Note) -
Expired
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Abstract
A gas-correlation filter spectroscopy-based method and apparatus for determining the concentration of gas species having significant average broadband absorption incorporates a compensating filter having an absorption spectrum that varies with wavelength similarly to the spectrum of the gas species. The compensating filter eliminates interference due to differential absorption. The invention is especially suited to detecting nitrogen dioxide.
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