Mid-IR spectroscopy using silver halide planar waveguide sensors for the chemical sensing of hazardous substances

B. Dekel; A. Katzir

doi:10.1117/12.864905

12 October 2010 Mid-IR spectroscopy using silver halide planar waveguide sensors for the chemical sensing of hazardous substances

B. Dekel, A. Katzir

Author Affiliations +

Proceedings Volume 7838, Optics and Photonics for Counterterrorism and Crime Fighting VI and Optical Materials in Defence Systems Technology VII; 783806 (2010) https://doi.org/10.1117/12.864905
Event: SPIE Security + Defence, 2010, Toulouse, France

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.

Citation Download Citation

B. Dekel and A. Katzir "Mid-IR spectroscopy using silver halide planar waveguide sensors for the chemical sensing of hazardous substances", Proc. SPIE 7838, Optics and Photonics for Counterterrorism and Crime Fighting VI and Optical Materials in Defence Systems Technology VII, 783806 (12 October 2010); https://doi.org/10.1117/12.864905

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