Effect and correction of environmental temperature on infrared radiation measurement precision

In order to enhance the radiation characteristic measurement precision of infrared system,the influence of the complex temperature change at field condition on the measurement precision is found out and corrected correspondingly. Firstly,the model for infrared radiation calibration is constructed,which includes influences of stray radiation noise and inner dark current,and the effect of temperature variety on the parameters of infrared radiation calibration is found out through the experiment carried in the high / low temperature test chamber. Experimental results show that the stray radiation variety caused by environmental temperature variety is the dominant factor for infrared radiation measurement precision,and at the same experiment,it is found that the gray variety caused by stay radiation is equal to the whole infrared system's gray variety when the environmental temperature changes,and based on this conclusion,a simple means for field infrared calibration data correction is put forward. Adopting this method,the blackbody at 70℃ is measured,the RMS error of blackbody temperature measurement is able to reduce from 0. 8℃ to 0. 095℃ within the temperature range of 0 ~ 50℃,which enhances the measurement precision greatly without increasing the operational difficulty.