Differential absorption radiometry for stand-off chemical detection

Gabriel Laufer

doi:10.1117/12.438186

22 August 2001 Differential absorption radiometry for stand-off chemical detection

Gabriel Laufer

Proceedings Volume 4378, Chemical and Biological Sensing II; (2001) https://doi.org/10.1117/12.438186
Event: Aerospace/Defense Sensing, Simulation, and Controls, 2001, Orlando, FL, United States

Abstract

A passive infrared (IR) sensor of chemical weapon agents (CWA) is being developed using a new approach (patent pending) for differential absorption radiometry (DAR). The sensor can be packaged as a handheld device, unattended sensor, remote imager and more. An agent is detected by its IR absorption (or emission) viewed through a bandpass filter centered at one of its strong spectral lines. A second detector is equipped with a filter centered at a frequency that was optimized to provide near perfect correction for background absorption by at least one atmospheric species, e.g., water vapor. The net absorption by the CWA is obtained by subtracting the reference signal of the background detector from that of the CWA-dedicated detector and normalized by dividing it by the total signal. A simple electronic circuit provides normalized differences to within 1:10⁶. This new approach replaces spectral scanning wiht detection at strong pre-selected spectral bands of chosen species and provides near perfect correction of absorption by pre-selected background species. The DAR is more efficient and thus more sensitive than alternative passive remote sensors. Specificity can be enhanced by integrating multiple DARs into a a single system using detector-filter arrays.

Citation Download Citation

Gabriel Laufer "Differential absorption radiometry for stand-off chemical detection", Proc. SPIE 4378, Chemical and Biological Sensing II, (22 August 2001); https://doi.org/10.1117/12.438186

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KEYWORDS

Sensors

Absorption

Signal detection

Optical filters

Infrared sensors

Bandpass filters

Atmospheric sensing

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