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低温红外目标源是测试和标定低温红外传感器的响应线性度和非均匀性的关键测试设备。对所研制的低温红外目标源设备的工作原理进行了论述,同时基于有限元分析方法,以ANSYS软件为载体对黑体面源控温方式及温度场分布进行模拟分析,并进行了测温实验。结果表明:所研制的低温红外目标源结构设计合理,仿真温度场与实测温度场分布规律一致,控温精度不大于0.5 K,黑体面源温度分布均匀,表面温差不大于0.2 K,稳定性好(≤0.1 K/min),可以满足低温红外系统的测试和检定要求。
Low Temperature Infrared Target Sources are the key test equipment for testing and calibrating the response linearity and inhomogeneity of cryogenic infrared sensors. The working principle of the low temperature infrared target source equipment was discussed. At the same time, based on the finite element analysis method, ANSYS software was used to simulate the temperature control mode and temperature distribution of the blackbody surface source. The temperature measurement experiment was carried out. The results show that the designed structure of low temperature infrared target is reasonable. The simulation temperature distribution is consistent with the measured temperature distribution. The accuracy of temperature control is not more than 0.5 K, and the surface temperature distribution of black body is uniform, the surface temperature difference is less than 0.2 K, and the stability is good (≤ 0.1 K / min) to meet the testing and verification requirements of cryogenic infrared systems.