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Proceedings Paper

Tunable diode laser spectrometer for high-precision concentration and ratio measurements of long-lived atmospheric gases
Author(s): Alan Fried; James R. Drummond; Bruce E. Henry; Jack Fox
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Paper Abstract

The ambient fluctuations of long-lived atmospheric gases such as carbon dioxide, methane, and carbonyl sulfide, to name a few, contain important information about sources, sinks and potential secular trends. Since such fluctuations can be quite small, typically less than a few percent, high precision instruments are required. In the present study, we describe a versatile tunable diode laser system for this purpose. This system employs a number of novel features for increased system control and versatility. In addition to high precision, such versatility enables us to acquire the ratio of 2 spectral features with high precision, even when the signal amplitudes are a factor of 26 different and when the spectral features are separated by as much as 0.424 cm-1. This capability can be used to address many important applications in atmospheric studies.

Paper Details

Date Published: 1 May 1991
PDF: 12 pages
Proc. SPIE 1433, Measurement of Atmospheric Gases, (1 May 1991); doi: 10.1117/12.46161
Show Author Affiliations
Alan Fried, National Ctr. for Atmospheric Research (United States)
James R. Drummond, Univ. of Toronto (Canada)
Bruce E. Henry, National Ctr. for Atmospheric Research (United States)
Jack Fox, National Ctr. for Atmospheric Research (United States)

Published in SPIE Proceedings Vol. 1433:
Measurement of Atmospheric Gases
Harold I. Schiff, Editor(s)

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