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Use of Room Temperature Infrared Diodes for Determining Methane Concentration in Air.

Authors
Gerritsen-H; Crisman-E; Taylor-CD; Et Al
Source
NTIS: PB/262-649 Available for Reference At Bureau Libraries :96 pages
Link
NIOSHTIC No.
10000368
Abstract
A device for detecting methane at levels above 0.1 pct in the air is described. It is based on the measurement of infrared absorption at 3.3 Micrometers by methane. The infrared light source is an in.97Ga.03As pn junction and the detector is an inas photovoltaic cell. The optical system was a three-mirror, folded-path cell. Various temperature compensation methods in the 0 to 5 deg c range were investigated. The primary temperature sensitivity is in the inas detector rather than in the emitters. The best system, which was demonstrated in a breadboard device, consisted of two emitters and one detector, one emitter being of a composition or distance from the detector so that it responded very little to methane while the other responded strongly to methane. The ratio then gives the desired methane concentration. Interference with water vapor was negligible and the device draws little power.
Publication Date
19760101
Document Type
CP; Final Contract Report;
Fiscal Year
1976
NTIS Accession No.
PB-262649
NTIS Price
A06
Identifying No.
OFR 13-77
NIOSH Division
PRC;
Source Name
NTIS: PB/262-649 Available for Reference At Bureau Libraries
Performing Organization
Brown University
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