Abstract
Operating in a wide temperature interval controlled liquid crystal optical filter for the visible and near infrared spectral ranges, combining with video surveillance devices, is described. The configurations of the filter using liquid crystal cells with a twist, homeotropic and planar orientations are considered. It is shown that the change in the transmission depending on the attached control voltage, typical for a neutral filter, is shown by the twist cell. The effect of the filter on the angular resolution of the video camera is evaluated.
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