Increasing the sensitivity of computer-integrated thermal imagers in the study of thermoelectric phenomena and remote observations
Keywords:
: polarimetric thermal imagers, Stokes vectors, polarizer, quarter-wave plateAbstract
The work is devoted to the substantiation of the choice of optical polarizing elements for thermal imaging remote observations and measurements. A comparative analysis of the main methods of obtaining polarization images was performed, namely using polarizer rotation, phase plate rotation, and using combined infrared matrix receivers with micro polarizers. Simplified mathematical models of signal transformation in the main optical elements of polarimetric thermal imagers – linear polarizers and phase (quarter-wave) plates - were used for the analysis. The advantage of wire polarizers compared to polarizers based on reflection is shown. It is also substantiated that among the various physical effects causing phase delays – birefringence, total internal reflection and reflection of radiation at the air-metal interface, diffraction on a wire diffraction grating – the use of the latter effect is most acceptable.
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