Phys.org  September 26, 2018 Man-made objects emit thermal radiation that is partially polarized while natural objects tend to emit thermal radiation that exhibits very little polarization. Researchers at the Army Research Laboratory and their industry partner are developing a special type of thermal camera that can record imagery that is based solely on the polarization state of the light rather than the intensity. This additional polarimetric information will allow soldiers to see hidden objects that were previously not visible when using conventional thermal cameras. The camera can detect and identify specific human subjects during complete darkness…read more.