Use of Room Temperature Diodes in Monitoring Specific Gases in Air, Particularly Methane and Carbon Monoxide.
Gerritsen-H; Reuman-S; Taylor-CD; Et Al
NTIS: PB/245-912 Available for Reference At Bureau Libraries :69 pages
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.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/245-912 Available for Reference At Bureau Libraries