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

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.