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

B. Dekel, A. Katzir

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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.

Original languageEnglish
Title of host publicationOptics and Photonics for Counterterrorism and Crime Fighting VI and Optical Materials in Defence Systems Technology VII
DOIs
StatePublished - 2010
EventOptics and Photonics for Counterterrorism and Crime Fighting VI and Optical Materials in Defence Systems Technology VII - Toulouse, France
Duration: 20 Sep 201023 Sep 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7838
ISSN (Print)0277-786X

Conference

ConferenceOptics and Photonics for Counterterrorism and Crime Fighting VI and Optical Materials in Defence Systems Technology VII
Country/TerritoryFrance
CityToulouse
Period20/09/1023/09/10

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