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Proceedings Paper

Application of FM spectroscopy in atmospheric trace gas monitoring: a study of some factors influencing the instrument design
Author(s): Peter W. Werle; K. Josek; Franz Slemr
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Paper 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.

Paper Details

Date Published: 1 May 1991
PDF: 8 pages
Proc. SPIE 1433, Measurement of Atmospheric Gases, (1 May 1991); doi: 10.1117/12.46159
Show Author Affiliations
Peter W. Werle, Fraunhofer Institute for Atmospheric Environmental Research (Germany)
K. Josek, Fraunhofer Institute for Atmospheric Environmental Research (Germany)
Franz Slemr, Fraunhofer Institute for Atmospheric Environmental Research (Germany)

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

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