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Edmund Koch, Bernd v.d. Smissen

Measurement of Medium Sized Molecules with Tunable Diode Lasers

Tunable diode lasers are increasingly used for the sensitive and selective measurement of many gaseous pollutants. Up to now their application to larger molecules as alcohol and benzene has failed, as these molecules do not feature sharp absorption lines. We investigated the requirements of a selective detection of the model substances benzene, toluene, and xylene on the laser sources. As external cavity lasers meeting these demands are not available commercially, we modified one to facilitate the measurement of these pollutants. It was found that the stability of the system is not sufficient for the sensitive detection of benzene due to subtle properties of the components.

tm – Technisches Messen, Oldenbourg Wissenschaftsverlag

Print ISSN: 0171-8096
Volume: 68, 10/2001
Pages: 431

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