Calibration technology of infrared standard transfer radiometer based on stimulated parametric down-conversion

Based on the correlation properties of photons generated during the process of the stimulated parametric down-conversion, a system for infrared standard transfer radiation measurement was constructed, which required no refrigeration and only used visible light detector. Firstly, the operating principle of the infrared standard transfer radiometer system was described in detail. Then, the calibration coefficient of the system was acquired by using the standard blackbody fitting, and the relationship between the temperature of the infrared standard transfer radiometer and the response value of the blackbody to be measured was obtained. Finally, the uncertainty of the infrared standard transfer radiometer system was further evaluated and verified by being compared with the radiation temperature retrieved from the response value of water-bath blackbody at the same temperature. The experimental results show that the joint uncertainty of the infrared standard transfer radiometer for measuring the radiation brightness of the water-bath blackbody is 1.64%, indicating that the infrared standard transfer radiometer can be used as the transfer standard of the blackbody to the user sensor.