Temperature-control polarization-degree-adjustable medium-wave infrared polarization radiation source and polarization degree measurement method

Abstract

The invention discloses a temperature control polarization degree adjustable medium wave infrared polarization radiation source and a polarization degree measuring method, and belongs to the field of photoelectric detection. The medium-wave infrared polarizer is arranged in the variable-temperature transmission support, the variable-temperature transmission support and the medium-wave infrared polarizer in the variable-temperature transmission support are cooled by liquid inert gas, and the proportion of complete polarization radiation components in the total radiation of the polarization radiation source is modulated by changing the temperature of the black body source and the variable-temperature transmission support. Therefore, the polarization degree of the medium-wave infrared polarization radiation source can be adjusted. Meanwhile, the temperature of the variable-temperature cabin of the variable-temperature transmission bracket is reduced, the negative interference of spontaneous radiation of the medium-wave infrared polarizer and stray light of the variable-temperature transmission bracket can be effectively reduced, and the modulation precision of the polarization degree of emergent light of the radiation source is improved. According to a polarization degree measurement result, calibrating a function relationship between the polarization degree of an emergent light field of the polarization radiation source and the temperature of the blackbody source and the temperature of the variable-temperature transmission bracket; and predicting the polarization degree of the temperature-controlled polarization-degree-adjustable medium-wave infrared polarization radiation source according to the calibrated function relationship.

Description

technical field [0001] The invention relates to a design of a temperature-controlled polarization degree adjustable mid-wave infrared polarization radiation source and a polarization degree measurement method, and belongs to the technical field of photoelectric detection. Background technique [0002] Infrared thermal polarization imaging technology is a new type of infrared imaging technology that has developed rapidly in recent years. It can detect and identify targets through the difference in infrared radiation and polarization characteristics of the scene, and can obtain more scene information than traditional intensity imaging, showing a wide range of application prospects. However, due to the non-ideality of the system itself (non-ideal polarization and nonlinear effects), false polarization information is often generated in the process of polarization thermal imaging, which affects the inversion accuracy of polarization information. Therefore, it is necessary to use c...

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Problems solved by technology

At the same time, the self-radiation of the polarizing system is easily affected by ambient temperature, air disturbance, etc., and the angle of the glass stack inside the polarizing system is difficult to adjust accurately, which causes the uncertainty of the polarization degree of the above-mentioned adjustable polarization radiation source. Accuracy is difficult to guarantee

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