中温区真空标准黑体辐射源研制

Development of Vacuum Standard Blackbody Radiation Source in Middle Temperature Zone

介绍了中国计量科学研究院研制的中温区真空标准黑体辐射源的结构设计,工作原理,测试结果和不确定度评定。黑体辐射源工作温度范围为320~500 K,黑体空腔开口直径为50 mm,空腔深度为260 mm,表面喷涂了耐高温漆,空腔发射率优于0.999。真空环境下测试了黑体在335~500 K温度范围内的轴向温度均匀性,温度稳定性及黑体辐射源亮度温度等性能指标,结果显示黑体温度均匀性优于0.15 K,40 min内温度稳定性优于0.03 K。分析了黑体辐射源的不确定度来源,黑体辐射源的合成标准不确定度优于0.04 K。

The structure design,working principle,test results and uncertainty evaluation of the medium temperature vacuum standard blackbody radiation source developed by National Institution of Metrology in China are introduced.The black body radiation source has a working temperature range of 320~500 K,the black body cavity aperture diameter is 50 mm,the cavity depth is 260 mm,the surface is sprayed with high temperature paint,and the cavity emissivity is better than 0.999.The blackbody's axial temperature uniformity,temperature stability and blackbody radiation source brightness temperature were tested in vacuum,and the blackbody temperature uniformity is better than 0.15 K,and the temperature stability within 40 min is better than 0.03 K.The uncertainty sources of black body radiation source are analyzed,and the combined standard uncertainty of the black body radiation source is better than 0.04 K.