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Data processing and calibration for tunable diode laser harmonic absorption spectrometersData processing and calibration methods are described for tunable diode laser absorption spectrometers which produce harmonic absorption spectra as raw data for measuring gas mixing ratios down to parts-per-trillion levels at a variety of pressures. The methods, which take advantage of modern computer speed, memory, and data storage capabilities, are applicable to the detection of weakly absorbing gases in quantitative industrial monitoring, in addition to aircraft and balloon atmospheric measurements for which they were designed. Algorithms for calibration and data analysis, including rejection of erroneous spectra, variation of effective integration time, spectral alignment prior to averaging, and plotting and archiving of results, have been tested on actual stratospheric laser spectra recorded by the Aircraft Laser Infrared Absorption Spectrometer (ALIAS) spectrometer in numerous flights of NASA's ER-2 aircraft.
Document ID
19930050813
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
May, Randy D.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Webster, Christopher R.
(JPL Pasadena, CA, United States)
Date Acquired
August 16, 2013
Publication Date
April 1, 1993
Publication Information
Publication: Journal of Quantitative Spectroscopy and Radiative Transfer
Volume: 49
Issue: 4
ISSN: 0022-4073
Subject Category
Instrumentation And Photography
Accession Number
93A34810
Distribution Limits
Public
Copyright
Other

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