Infrared defocus plane polarization correction method based on polarizer reflection polarization characteristics

By adding correction coefficients and nonlinear fitting to the radiative transfer model of the infrared focal plane polarization imaging system, and combining it with temperature-controlled adjustable infrared polarization radiation source for calibration, the overcorrection problem of the infrared focal plane polarization imaging system is solved, and the system's calibration accuracy and polarization information calculation accuracy are improved.

CN116642596BActive Publication Date: 2025-12-05BEIJING INST OF TECH
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Patent Information

Application Number
CN202310368701.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-10
Publication Date
2025-12-05
Estimated Expiration
2043-04-10

AI Technical Summary

Technical Problem

Infrared focal plane polarization imaging systems suffer from parameter overcorrection and reduced system resolution due to the failure to consider the polarization characteristics of polarizer reflection and radiation.

Method used

By adding a correction coefficient to the radiative transfer model of the infrared focal plane polarization imaging system to adjust the additional radiation, using a nonlinear method to fit the relationship between image grayscale and incident radiation, and calibrating using a temperature-controlled adjustable infrared polarization radiation source, a radiative transfer model of the infrared focal plane polarization imaging system is constructed to achieve response and polarization correction.

Benefits of technology

This improves the correction accuracy of the infrared focal plane polarization imaging system, reduces the measurement and calculation errors of the micro polarizer array parameters, and ensures the accurate calculation of polarization information of the external scene.

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Abstract

The application discloses an infrared focal plane polarization correction method based on the reflection polarization characteristics of a polarizer and belongs to the technical field of polarization imaging and test measurement. The method of the application is as follows: a correction coefficient is added to adjust additional radiation to obtain a radiation transmission correction model of an infrared polarization imaging system with a front polarizer; a nonlinear method is used to fit the relationship between image gray scale and incident radiation to realize response correction of the infrared polarization imaging system with the front polarizer; the infrared polarization imaging system with the front polarizer is used to calibrate a temperature-controllable adjustable infrared polarization radiation source; a radiation transmission model of an infrared focal plane polarization imaging system is constructed; and the temperature-controllable adjustable infrared polarization radiation source is used to perform response correction and polarization correction on the infrared focal plane polarization imaging system. Compared with placing a high-extinction-ratio polarizer in front of a black body, the application can avoid over-correction of the parameters of a micro-polarizer array and improve the correction accuracy of the infrared focal plane polarization imaging system.
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