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11 September 2003 Passive IR polarization measurements applied to covered surface landmines
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Polarization measurements in the IR region, especially in the 8-12 μm wavelength region (LW), are useful to detect man-made object in a natural environment. An example is surface laid mines partly covered by grass, dirt or sand. It has been shown that polarization measurements have improved the possibility to detect partly covered objects. This makes reconnaissance and surveillance sensors and warners more efficient. The equipment used in the measurements reported here is a IR Thermovision camera, in the region 8-12 μm. By applying a linear polarizing filter in front of the camera, it is possible to measure the Stokes parameters, “Degree of Linear Polarization” (DoLP) and “Theta”. The circular polarization component is regarded as small and is being neglected in these measurements. This article reports the results of surface scattering properties measurements on personal mines by using polarization. Measurements and simple model calculations performed on covered surface landmines in natural environment have been reported earlier. A more systematic investigation is reported here. The results indicate that IR polarization is a powerful tool to detect mines. Further, the emissivity as a function of emission angle has been measured for different coverage of the mine, and the DoLP has been calculated for different emission angle.
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Goran Forssell "Passive IR polarization measurements applied to covered surface landmines", Proc. SPIE 5089, Detection and Remediation Technologies for Mines and Minelike Targets VIII, (11 September 2003);

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