Starting from a few targets and backgrounds with known spectral reflectivity or emissivity, the contrast was used to show its influence on the signal strength reaching the surface of the video detector (imager) in similar environment conditions. Finally, the authors seek certain characteristics of the electro-optical system itself that can influence most the strength and quality of the optical signal with respect to influences on observation distances of the target. The possibility of using an active technology instead of a passive one, by introducing a pulsed laser illuminator, is also analyzed. The use of some polarizing filters is also considered but in this stage only in laboratory conditions, in order to improve the observability of an object in some special environmental circumstances.
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Octavia Borcan, Danut Ursu, Constantin Marin, Alexandru Toma, Anca Beldiceanu, "Attempt to find optimal selections of EO systems for good results of imaging in real environment surveillance process," Proc. SPIE 10433, Electro-Optical and Infrared Systems: Technology and Applications XIV, 104330F (6 October 2017);