How to select the main parameters of the lenses of modern thermal viewers

摘要

This paper proposes an engineering technique for selecting the diameter and focal length of the lenses of modern high-sensitivity thermal viewers in order to provide the devices with a specified acquisition range and threshold sensitivity. The technique can be implemented by accumulating signals with very low values of the noiseequivalent temperature difference, at which the efficiency of these devices is no longer limited by the singal-to-noise ratio but by the contrast sensitivity of the operator's visual analyzer. (C) 2017 Optical Society of America