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Proceedings Paper

Mid-IR spectroscopy using silver halide planar waveguide sensors for the chemical sensing of hazardous substances
Author(s): B. Dekel; A. Katzir
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Paper Abstract

There is a worldwide interest in developing a sensing system for the online detection and chemical identification of hazardous substances, especially in water and in air. Towards this goal we have developed an evanescent wave spectroscopy system based on a tunable CO2 on an IR detector and on thin AgBr flat waveguides, which were transparent in the mid-IR and served as sensing elements. Aqueous solutions of common pesticides (e.g. DDVP, Parathion, Diazinon) were placed on the waveguide and spectral absorption measurements were performed in the mid-IR. Using the results, we were able to detect these pesticides at concentrations as low as few ppm and distinguish between them. Such a system would be invaluable for homeland security applications.

Paper Details

Date Published: 12 October 2010
PDF: 13 pages
Proc. SPIE 7838, Optics and Photonics for Counterterrorism and Crime Fighting VI and Optical Materials in Defence Systems Technology VII, 783806 (12 October 2010); doi: 10.1117/12.864905
Show Author Affiliations
B. Dekel, Ruppin Academic Ctr. (Israel)
A. Katzir, Tel Aviv Univ. (Israel)


Published in SPIE Proceedings Vol. 7838:
Optics and Photonics for Counterterrorism and Crime Fighting VI and Optical Materials in Defence Systems Technology VII
Colin Lewis; Roberto Zamboni; François Kajzar; Doug Burgess; Emily M. Heckman, Editor(s)

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