Selective detection of hydrocarbon vapors by ATR-leaky mode spectroscopy

R. P. Podgorsek; Hilmar Franke; John G. Woods; Roger A. Lessard

doi:10.1117/12.379576

15 March 2000 Selective detection of hydrocarbon vapors by ATR-leaky mode spectroscopy

R. P. Podgorsek, Hilmar Franke, John G. Woods, Roger A. Lessard

Proceedings Volume 3912, Micro- and Nanotechnology for Biomedical and Environmental Applications; (2000) https://doi.org/10.1117/12.379576
Event: BiOS 2000 The International Symposium on Biomedical Optics, 2000, San Jose, CA, United States

Abstract

The technique of dynamic ATR-leaky mode spectroscopy is demonstrated for polymer films on 50 nm Ag layers. For the vapor series R OH with R equals H,CH₃, C₂ H₅ and the BTX compounds benzene, toluene and the 3 xylene isomers two different ways of obtaining selective sensor detection are described. The first approach uses the specific sensitivity. Each vapor has a specific molecular polarizability which causes a specific sensitivity. The second approach takes advantage of the dynamic method. The specific diffusion of the particular molecule in the polymer matrix can be evaluated. In this context the characteristic diffusion of the 3 isomers of xylene are investigated.

Citation Download Citation

R. P. Podgorsek, Hilmar Franke, John G. Woods, and Roger A. Lessard "Selective detection of hydrocarbon vapors by ATR-leaky mode spectroscopy", Proc. SPIE 3912, Micro- and Nanotechnology for Biomedical and Environmental Applications, (15 March 2000); https://doi.org/10.1117/12.379576

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