Application of FM spectroscopy in atmospheric trace gas monitoring: a study of some factors influencing the instrument design

Peter W. Werle; K. Josek; Franz Slemr

doi:10.1117/12.46159

1 May 1991 Application of FM spectroscopy in atmospheric trace gas monitoring: a study of some factors influencing the instrument design

Peter W. Werle, K. Josek, Franz Slemr

Author Affiliations +

Proceedings Volume 1433, Measurement of Atmospheric Gases; (1991) https://doi.org/10.1117/12.46159
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States

Abstract

Absorption spectroscopy with tunable diode lasers (TDLAS) is increasingly being used to monitor atmospheric trace gases down to high pptv-levels. These sensitivities have been achieved with low frequency wavelength modulation (WM). A sensitivity improvement by about two orders of magnitude was demonstrated with a high frequency modulation (FM) technique in experiments with single pass absorption cells. In practical TDLAS instruments however, the achievable sensitivity improvement is limited by several factors. In this paper, limitations due to the use of multipass absorption cells and due to the stability of the instrument are discussed.

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Peter W. Werle, K. Josek, and Franz Slemr "Application of FM spectroscopy in atmospheric trace gas monitoring: a study of some factors influencing the instrument design", Proc. SPIE 1433, Measurement of Atmospheric Gases, (1 May 1991); https://doi.org/10.1117/12.46159

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