Search academic texts

Information × Registration Number 0223U002256, 0121U109554 , R & D reports Title Development of polarization methods for masked objects detecting by aerospace and ground-based thermal imagers popup.stage_title Head Kolobrodov Valentyn H, Registration Date 14-02-2023 Organization National Technscal University of Ukraine "Kiev Polytechnic Institute". popup.description2  The work is devoted to increasing thermal imagers detection capabilities for terrestrial and aerospace remote monitoring by using the polarization properties of targets and backgrounds infrared (IR) radiation. Analysis of polarization state of reflected and intrinsic objects IR radiation in a number of cases makes it possible to clearly distinguish masked targets even when other modern detection methods do not work, or the temperature contrast of the object against the background is absent. For this purpose, in the work, an attempt was made to combine several areas of optical-electronic instrumentation - thermography, polarimetry, visual perception in the tasks of searching and detecting objects - in order to create an adequate and sufficiently complete calculation toolkit for designing polarimetric channels of survey optical-electronic systems. As a result of the work, the following was developed: mathematical model of visual contrasts in the final image formation due to the polarization of its own and reflected IR radiation during observations on natural anisotropic backgrounds; a complex method of evaluation the thermal imagers with a polarimetric channel effectiveness; computer-integrated methods of detecting low-contrast objects by polarization-thermographic features; method of determining the detection and recognition probability of the target using polarization thermal imagers. Also peculiarities of the use of polarizing elements in computer-integrated thermal imagers were investigated and simple method of polarization degree measuring using a germanium plate was developed. The studies showed that the probability of detecting objects with low energy contrast is determined mainly by the target's radiation polarization degree in case that the object is located on a background that emits incoherently. Even in the case of a complete absence of energy contrast, the probability of target recognition by polarization unmasking feature is 90%. Product Description popup.authors Vasylkovska Inna O. Kolobrodov Mykyta Kravchenko Igor Mykytenko Volodymyr Tymchyk Gregory Tsybulsky Leonid Shevchenko Vadym popup.nrat_date 2023-02-14 Close