H500型红外遥感定标高精度真空黑体辐射源的研制

对中国计量科学研究院研制的温度范围覆盖-93~220℃的H500型红外遥感定标高精度真空黑体辐射源进行了介绍。采用圆柱圆锥黑体腔和双层4段PID控温,在真空低背景(液氮冷却)环境下对该黑体进行了性能测试,在大气室温环境下,利用控制环境辐射反射比发射率测量方法测量了黑体空腔发射率和利用红外标准辐射温度计测量空腔底部温度均匀性等指标。实验结果表明,该黑体辐射源升温速率为1℃/min下,控制到温度点的稳定时间优于50 min,并且10 min内的温度稳定性在0.01℃以内;黑体温度设置在20℃、30℃和50℃下空腔发射率的测量结果分别为0.9965、0.9966和0.9963;其黑体底部温度均匀性优于0.03℃;在整个温度区域内扩展不确定度优于0.1℃(k=2)。

Development of H500 Type High Precision Vacuum Blackbody Used as a Calibration Standard for Infrared Remote Sensing

A high precision vacuum blackbody(H500 type)with the temperature range between-93 ℃ to 220 ℃ is developed at the National Institute Metrology of China.The performances are tested under the vacuum and low background condition (liquid-nitrogen-cooled shroud).The major technical parameters of the blackbody, such as the emissivity and uniformity are measured at room temperature and atmospheric environment.When the heating rate is 1 ℃/min, the time is shorter than 50 minutes and the temperature stability is better than 0.01 ℃ during 10 minutes.The emissivity of the blackbody at 20 ℃, 30 ℃ and 50 ℃ are 0.9965, 0.9966 and 0.9963, respectively.The temperature uniformity at the bottom of the blackbody cavity is better than 0.03 ℃.The expanded uncertainty is better than 0.1 ℃(k=2) over the entire temperature range.