In-situ trace gas analysis using high-frequency modulation spectroscopy with tunable diode lasers

Peter W. Werle; Robert Josef Muecke

doi:10.1117/12.221075

20 September 1995 In-situ trace gas analysis using high-frequency modulation spectroscopy with tunable diode lasers

Peter W. Werle, Robert Josef Muecke

Proceedings Volume 2506, Air Pollution and Visibility Measurements; (1995) https://doi.org/10.1117/12.221075
Event: European Symposium on Optics for Environmental and Public Safety, 1995, Munich, Germany

Abstract

The main requirements for in situ trace gas analysis, process and air pollution monitoring are specifity, high time resolution, and high sensitivity. Tunable diode lasers absorption spectroscopy is increasingly being used to measure trace gas concentrations down to low ppbv- levels (10^-9 volume mixing ratio). The applications of high frequency modulation (FM) schemes can further improve sensitivity and detection speed of modern instrumentation. In this paper the FM technique will be reviewed with respect to current limitations of tunable diode laser spectroscopy. Recent investigations and findings will be described with emphasis on the work done in our laboratory and novel approaches will be discussed. Some applications related to quality control and ISO calibration as well as fast and high sensitivity measurement challenges will be discussed.

Citation Download Citation

Peter W. Werle and Robert Josef Muecke "In-situ trace gas analysis using high-frequency modulation spectroscopy with tunable diode lasers", Proc. SPIE 2506, Air Pollution and Visibility Measurements, (20 September 1995); https://doi.org/10.1117/12.221075

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