Active standoff chemical identification detector

Jay P. Giblin; Julia R. Dupuis; John P. Dixon; Joel M. Hensley; David J. Mansur; William J. Marinelli

doi:10.1117/12.2302718

23 May 2018 Active standoff chemical identification detector

Jay P. Giblin, Julia R. Dupuis, John P. Dixon, Joel M. Hensley, David J. Mansur, William J. Marinelli

Proceedings Volume 10629, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIX; 1062919 (2018) https://doi.org/10.1117/12.2302718
Event: SPIE Defense + Security, 2018, Orlando, FL, United States

Abstract

An active, standoff, all-phase chemical detection capability has been developed under IARPA’s SILMARILS program. The detection platform utilizes reflectance spectroscopy in the longwave infrared coupled with an automated detection algorithm that implements physics-based reflectance models for planar chemical films, particulate in the solid and liquid phase, and vapors. Target chemicals include chemical warfare agents, toxic industrial chemicals, and explosives. The platform employs broadband Fabry-Perot quantum cascade lasers with a spectrally selective detector to interrogate target surfaces at tens of meter standoff. A statistical F-test in a noise whitened space is used for detection and discrimination over a large target spectral library in high clutter environments.

The capability is described with an emphasis on the physical reflectance models used to predict spectral reflectivity signatures as a function of surface contaminant presentation and loading. Developmental test results from a breadboard version of the detector platform are presented. Specifically, solid and liquid surface contaminants were detected and identified from a library of 325 compounds down to 30 μg/cm² surface loading at a 5 m standoff. Vapor detection was demonstrated via topographic backscatter.

Conference Presentation

Citation Download Citation

Jay P. Giblin, Julia R. Dupuis, John P. Dixon, Joel M. Hensley, David J. Mansur, and William J. Marinelli "Active standoff chemical identification detector", Proc. SPIE 10629, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIX, 1062919 (23 May 2018); https://doi.org/10.1117/12.2302718

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