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Diode-Laser-Based Spectrometer for Sensing GasesA diode-laser-based spectrometer has been developed for measuring concentrations of gases and is intended particularly for use in analyzing and monitoring combustion processes under microgravitational conditions in a drop tower or a spacecraft. This instrument is also well suited for use on Earth in combustion experiments and for such related purposes as fire-safety monitoring and monitoring toxic and flammable gases in industrial settings. Of the gas-sensing spectrometers available prior to the development of this instrument, those that were sensitive enough for measuring the combustion gases of interest were too large, required critical optical alignments, used far too much electrical power, and were insufficiently rugged for use under the severe conditions of spacecraft launch and space flight. In contrast, the present instrument is compact, consumes relatively little power, and is rugged enough to withstand launch vibrations and space flight. In addition, this instrument is characterized by long-term stability, accuracy, and reliability. The diode laser in this spectrometer is operated in a wavelength-modulation mode. Different gases to be measured can be selected by changing modular laser units. The operation of the laser is controlled by customized, low-power electronic circuitry built around a digital signal-processor board. This customized circuitry also performs acquisition and analysis of data, controls communications, and manages errors.
Document ID
20110014678
Acquisition Source
Glenn Research Center
Document Type
Other - NASA Tech Brief
External Source(s)
http://www.techbriefs.com/component/content/article/166
Authors
Silver, Joel A. (Southwest Sciences, Inc. Cincinnati, OH, United States)
Date Acquired
August 25, 2013
Publication Date
January 1, 2005
Publication Information
Publication: NASA Tech Briefs, January 2005
Subject Category
Man/System Technology And Life Support
Report/Patent Number
LEW-17546-1
Distribution Limits
Public
Copyright
Public Use Permitted.

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IDRelationTitle20110014676Collected WorksNASA Tech Briefs, January 2005
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