Method and apparatus for accurate remote monitoring of gases
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United States of America Patent
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May 28, 1985
Grant Date -
N/A
app pub date -
Sep 6, 1983
filing date -
Sep 6, 1983
priority date (Note) -
Expired
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Abstract
Apparatus is provided which permits highly accurate remote measurement of methane gas concentrations even in daylight through the use of an extremely narrow spectral filter centered on the Q-branch of the methane absorption band at 3.3 microns and through the use of cooperating comparison channels with digital processing for real time correction of data to compensate for surface temperature, atmospheric temperature and atmospheric water absorption factors.
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