Airborne nondispersive infrared monitor for atmospheric trace gases

Details Airborne nondispersive infrared monitor for atmospheric trace gases Airborne nondispersive infrared monitor for atmospheric trace gases

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978rsci...49.1520s&link_type=abstract

Review of Scientific Instruments, Volume 49, Issue 11, pp. 1520-1525 (1978).

Physics

2

Air Quality And Air Pollution

Scientific paper

An airborne gas-filter correlation analyzer was designed and assembled to monitor atmospheric trace gases. Flight tests indicated that a methane version of this nondispersive infrared instrument performed properly while measuring CH4 concentration profiles as small as 1 ppm from altitudes of 0.15 up to 1.2 km. A unique multiple chopping scheme was developed to simplify the gas-filter technique and to provide an easy mechanical nulling procedure. The single-beam rotating-cell optical system integrated with a multipass sampling cell and the signal processing circuit are described in detail.

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