Method and apparatus for accurate remote monitoring of gases

Details Method and apparatus for accurate remote monitoring of gases Method and apparatus for accurate remote monitoring of gases

1983-09-06

1985-05-28

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250339, 250343, G01J 100

Patent

active

045202656

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.

REFERENCES:
patent: 3976884 (1976-08-01), Acton et al.
patent: 4157470 (1979-06-01), Kotaka et al.
Herget, W. et al., "Infrared Gas-Filter Correlation Instru. for In Situ Means of Gaseous Pollutant Con.", Applied Optics, vol. 15, No. 5, (1976), p. 1222.

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