Tunable diode laser spectrometer for high-precision concentration and ratio measurements of long-lived atmospheric gases

Alan Fried; James R. Drummond; Bruce E. Henry; Jack Fox

doi:10.1117/12.46161

1 May 1991 Tunable diode laser spectrometer for high-precision concentration and ratio measurements of long-lived atmospheric gases

Alan Fried, James R. Drummond, Bruce E. Henry, Jack Fox

Author Affiliations +

Proceedings Volume 1433, Measurement of Atmospheric Gases; (1991) https://doi.org/10.1117/12.46161
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States

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.

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Alan Fried, James R. Drummond, Bruce E. Henry, and Jack Fox "Tunable diode laser spectrometer for high-precision concentration and ratio measurements of long-lived atmospheric gases", Proc. SPIE 1433, Measurement of Atmospheric Gases, (1 May 1991); https://doi.org/10.1117/12.46161

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