Study on the calibration method for the measurement of low-temperature radiation responsivity of IR camera

Abstract

Along with the popular application of focal-plane array IR camera, the field of IR detection and measurement is extended from qualitative to quantitative measurement. In the area of low-temperature radiation quantitative measurement for small targets in low temperature background, one of the most important techniques for IR radiation in low-temperature measurement is IR radiation calibration in the low-temperature. With the need of measuring small weak target with IR camera in our research, we developed a special large aperture low-temperature blackbody which is different from vacuum blackbody for low-temperature calibration, and presented an effective method for low-temperature calibration of IR camera to the lowest temperature at -100ºC. The key technology in the camera’s calibration includes anti-frosting in low-temperature, correcting calibration results. In the calibration, adopts end to end way to make the infrared rays full of the FOV of camera. This method minimizes the influence of CO₂, H₂O in the air, and improves the accuracy of calibration.