关键词: 宽温度范围, 变温, 大口径, 标准黑体辐射源, 计量

Abstract: 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.

Key words: Wide temperature range, Variable-temperature, Large aperture, Standard blackbody radiation source, Metrology