Passive LWIR hyperspectral imaging of surfaces contaminated by CWA droplets

L. Landström; F. Kullander; P. Wästerby; B. T. Røen

doi:10.1117/12.2520420

17 May 2019 Passive LWIR hyperspectral imaging of surfaces contaminated by CWA droplets

L. Landström, F. Kullander, P. Wästerby, B. T. Røen

Proceedings Volume 11010, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XX; 1101013 (2019) https://doi.org/10.1117/12.2520420
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States

Abstract

A passive LWIR camera based on a focal plane array detector was used to capture hyperspectral images of different scenes where low volatile chemical warfare agent (CWA) and simulant droplets were deposited on a variety of substrates. Four different CWA; mustard gas (HD), cyclosarin (GF), VX, VR, and two simulant liquids; dimethyl methylphosphonate (DMMP) and triethyl phosphate (TEP) were used as surface contaminants and applied to the substrates as 5 μl droplets. The trials were performed outdoors with the scene close to the ground and the camera imaging at an angle of approximately 35° and a stand-off distance of about 2 m, i.e., mainly the reflected radiation from the cold sky in combination with the thermal emission from the scene was observed. Brightness temperature spectra were extracted from the hyperspectral data cubes and compared to results from a thin film model as well as reference LWIR spectra of the liquids.

Citation Download Citation

L. Landström, F. Kullander, P. Wästerby, and B. T. Røen "Passive LWIR hyperspectral imaging of surfaces contaminated by CWA droplets", Proc. SPIE 11010, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XX, 1101013 (17 May 2019); https://doi.org/10.1117/12.2520420

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