A new infrared radiation calibration method based on lens cover deduction of internal stray radiation

•A new infrared radiation calibration method based on lens cover deduction of internal stray radiation is proposed. This method does not rely on the empirical relationship between internal stray radiation of equipment and environmental temperature as existing methods, but cleverly transforms the influence of internal stray radiation of optical systems into the influence of lens cover radiation.•For the high attenuation attenuator, the relative error of the traditional calibration method is too large, and their calibration coefficients can no longer be used normally; The relative error level of calibration under any transmittance attenuator in this article's calibration method is consistent, and the calibration coefficients can still be used normally.•For the 100% transmittance attenuator, the mean relative error of our method is also about two times smaller than that of traditional methods. A new infrared radiation calibration method based on lens cover deduction of internal stray radiation is proposed to address the issue of grayscale deviation of infrared radiation measurement systems caused by environmental temperature changes, which leads to the failure of the traditional infrared radiation calibration method. Firstly, the influence of environmental temperature on the traditional radiation calibration was analyzed. Then, a mathematical model for infrared radiation calibration based on lens cover deducting internal stray radiation was established, and compared the environmental adaptability with the traditional radiation calibration. Finally, the experimental results show that this method has the ability to enhance the environmental adaptability of infrared radiation measurement systems, improve the accuracy of infrared radiation measurement, and especially for the optical system with high attenuation attenuator, the calibration coefficient can achieve the same environmental adaptability as that for the 100% transmittance attenuator. The environmental adaptability of the calibration coefficient is also greatly better than the traditional calibration for the 100% transmittance attenuator.