真空式高温黑体辐射源性能评价

Performance evaluation of vacuum high⁃temperature blackbody radiation source

为解决真空环境下辐射热流传感器的校准问题,采用热解石墨作为加热元件,通过标准光电高温计测量并控制温度,研建了50 mm大口径真空式高温黑体辐射源装置。开展了装置性能指标的测试试验和评价,结果显示装置10 min内的温度稳定性不超过0.5℃,径向温度均匀性不超过0.1%t(t为设定温度点),符合相应标准要求。最后计算分析了热流校准过程中真空式高温黑体辐射源装置性能指标引入的不确定度分量,为推动该装置在热流校准、辐射温度校准等领域中的应用提供了重要支撑。

In order to solve the calibration problem of radiation heat flux sensors in vacuum environments,a 50 mm large⁃diameter vacuum high⁃temperature blackbody radiation source device was developed by using pyrolytic graphite as the heating element,and measuring and controlling the temperature using a standard photoelectric pyrometer,and the performance indexes of the device were tested and evaluated.The temperature stability of the device within 10 min was not more than 0.5℃,and the radial temperature uniformity was not more than 0.1%t(t is the set temperature),which met the requirements of relevant regulations.Finally,the uncertainty components introduced by the performance indexes of the vacuum high⁃temperature blackbody radiation source in the process of heat flow calibration were calculated and analyzed.The research results provide strong support for promoting the application of the device in the calibrations of heat flow,ra⁃diation temperature and other fields.