宽温度范围大口径高精度变温标准黑体辐射源研制

红外成像探测系统的应用环境越来越复杂，工作适应温度范围低温可达到-50 ℃以下，高温可达到70 ℃以上。为满足相应要求，研制宽温度范围大口径高精度变温标准黑体辐射源，采用细分均匀加热、模糊PID自整定控制算法、双路配气保护等技术，满足高低温需求，同时开展腔型设计、超黑高发射率涂层等相应研究，保证了黑体辐射源的整体性能，确保完成相应功能。研制完成后，在高低温环境下进行了验证试验，可达到以下指标：有效发射率≥0.999，空腔开口直径≥60 mm，温度测量不确定度10 mK（k=2）。经验证，可满足宽温度范围条件红外探测系统的计量要求。

Development of Wide Temperature Range Large-diameter High-precision Variable-Temperature Standard Blackbody Radiation Source

The application environment of the infrared imaging detection system is becoming more and more complex.Its working temperature range is getting wider and wider,the low temperature can reach below -50 ℃,and the high temperature can reach above 70 ℃.In order to meeting the requirements above,a large-diameter high-precision variable-temperature standard blackbody source is developed in this paper.Subdivision uniform Heating and fuzzy PID control algorithm with adaptive parameter and dual gas protection are adopted to meet high and low temperatuer requirements.Furthermore,the research on cavity design and super black high emissivity coating is carried out to ensure the completion of corresponding functions.After the development is finished,the verification test is carried out in the high and low temperature environment.The following specifications are achieved:effective emissivity≥0.999,cavity diameter≥60 mm,temperature measurement uncertainty:10 mK（k=2).It is proven to meet metrological requirements for infrared detection systems in wide temperature environment.