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Use of Room Temperature Diodes in Monitoring Specific Gases in Air, Particularly Methane and Carbon Monoxide.

Authors
Gerritsen-H; Reuman-S; Taylor-CD; Et Al
Source
NTIS: PB/245-912 Available for Reference At Bureau Libraries :69 pages
Link
NIOSHTIC No.
10000293
Abstract
Light-emitting diodes of in8ga1-8as have been prepared that produce room temperature infrared (ir) radiation at the 3.32-micrometer peak of the methane absorption band. Photovoltaic inas detectors have also been produced using similar techniques. The detectors and light-emitting diodes have been combined with commercial electronics equipment to produce a system capable of sensing the presence of methane gas at concentrations of 0.1 percent (balance: dry n2). Development has been done on the optics and on balancing the second- order effects of water vapor, temperature changes, and dust accumulations, which can reach the same magnitude as the signal change produced by 0.5 percent methane. Prototype circuits have been developed and tested.
Publication Date
19740101
Document Type
CP; Final Contract Report;
Fiscal Year
1974
NTIS Accession No.
PB-245912
NTIS Price
A05
Identifying No.
OFR 78-75
NIOSH Division
PRC;
Source Name
NTIS: PB/245-912 Available for Reference At Bureau Libraries
Performing Organization
Brown University
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