Passive IR polarization measurements applied to rough surfaces consisting of ceno-sphere particles covered with gold.

Details Passive IR polarization measurements applied to rough surfaces consisting of ceno-sphere particles covered with gold. Passive IR polarization measurements applied to rough surfaces consisting of ceno-sphere particles covered with gold.

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002spie.4819..145f&link_type=abstract

Polarization Measurement, Analysis, and Applications V. Edited by Goldstein, Dennis H.; Chenault, David B. Proceedings of th

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Using passive IR polarization enhances the possibility to detect man made objects. Usually, man made objects consist of flat surfaces which polarize the emitted and reflected radiation, thereby increasing the contrast relative to an almost completely depolarized background. This makes reconnaissance and surveillance sensors and warners more efficient. In order to protect an object from being detected by a polarization sensitive sensor the surface of the object should be less sensitive to polarization. This is achieved by increasing the surface roughness. In this paper describes the use of cenosphere particles to increase the surface roughness and hence reducing the polarization. At the same time it is important to decide the value of the emissivity due to the need of contrast reduction. Evaporating gold with different coverage on the surface does this. The equipment used here consist of two IR Thermovision cameras, one for the wavelength region 3-5 μm and the other for the region 8-12μm. By applying linear polarizing filters in front of the cameras, it is possible to measure the emissivity curves. The emissivity of the used cenosphere samples varies between about 0.90 and 0.23. For all samples the radiation is close to Lambertian and they all depolarize the radiation completely.

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