Enhanced target detection and identification using multispectral and hyperspectral polarimetric thermal measurements

Daniel A. Lavigne; Jean-Marc Thériault; Denis Dion; Gilles Fortin; Mélanie Breton

doi:10.1117/12.2323617

9 October 2018 Enhanced target detection and identification using multispectral and hyperspectral polarimetric thermal measurements

Daniel A. Lavigne, Jean-Marc Thériault, Denis Dion, Gilles Fortin, Mélanie Breton

Author Affiliations +

Proceedings Volume 10795, Electro-Optical and Infrared Systems: Technology and Applications XV; 107950C (2018) https://doi.org/10.1117/12.2323617
Event: SPIE Security + Defence, 2018, Berlin, Germany

Abstract

The performance of thermal electro-optic infrared sensors (EO/IR) may be limited in certain specific circumstances, particularly for the detection and identification of targets embedded in an isothermal scene, i.e. when there is insufficient thermal contrast between the targets against their surrounding background. Such situations generally occur at the beginning and end of the day, but can also happen at any time during the day. One way to cope with this limitation is to employ EO/IR sensors that are sensitive to the polarization states of light. With this intention, Defence Research and Development Canada (DRDC) has developed thermal infrared multispectral and hyperspectral polarimetric imaging systems and spectral algorithms to extract the polarized radiance components of targets of interest, and use this additional information to enhance detection and identification while reducing false alarm rate. This paper presents experimental results from measurements using ground-based multispectral and hyperspectral polarimetric imaging sensors to acquire the polarized radiance of targets set up at multiple orientation angles with respect to the sensors lineof-sight (LOS). The objectives of the experiments were to study the phenomenology of polarized surface radiance in the Long-Wave Infrared (LWIR) and assess the effect of different materials on the resulting s-polarized and p-polarized spectral components. Experimental results show the advantages of thermal multispectral and hyperspectral polarimetric imaging sensors over conventional unpolarized ones to discriminate targets against their background, particularly during thermal cross-over periods.

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Daniel A. Lavigne, Jean-Marc Thériault, Denis Dion, Gilles Fortin, and Mélanie Breton "Enhanced target detection and identification using multispectral and hyperspectral polarimetric thermal measurements", Proc. SPIE 10795, Electro-Optical and Infrared Systems: Technology and Applications XV, 107950C (9 October 2018); https://doi.org/10.1117/12.2323617

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KEYWORDS

Sensors

Polarimetry

Long wavelength infrared

Polarization

Target detection

Liquids

Reflectivity

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