| 4 K低温辐射计的吸收腔吸收率测试技术研究 |
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| 引用本文： | 俞兵,范纪红,袁林光,李燕,郭磊,王啸,储隽伟,秦艳,孙宇楠,张灯,尤越,金伟其. 4 K低温辐射计的吸收腔吸收率测试技术研究[J]. 红外与激光工程, 2022, 51(9): 20210984-1-20210984-8. DOI: 10.3788/IRLA20210984 |
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| 作者姓名： | 俞兵 范纪红 袁林光 李燕 郭磊 王啸 储隽伟 秦艳 孙宇楠 张灯 尤越 金伟其 |
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| 作者单位： | 1.北京理工大学 光电成像技术与系统教育部重点实验室，北京 100081 |
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| 基金项目： | 国防科工局技术基础项目（JSJL2018208A001） |
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| 摘 要： | 为了实现低温辐射计工作温度4 K条件下吸收腔吸收率的测量，研究了变温条件下吸收腔吸收率的测量方法。通过在低温辐射计布儒斯特窗口前设计反射监测组件，并控制低温辐射计工作在10?6 Pa的真空环境下，调节低温辐射计制冷温度，分别测量室温条件和不同温度条件下低温辐射计吸收腔在632.8 nm处的反射信号，结合利用传统积分球法在室温条件下低温辐射计吸收腔632.8 nm处反射率的测量结果，通过计算可精确得到不同温度条件下低温辐射计吸收腔的吸收率。实验测量吸收腔在室温条件和4 K温度条件下的吸收率，分别为0.99976和0.99971，对4 K条件下低温辐射计吸收腔吸收率的测量不确定度进行评定，得到的结果显示其相对扩展不确定度为0.005%（k=2）。
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| 关 键 词： | 低温辐射计 吸收腔 反射率 吸收率 |
| 收稿时间： | 2021-12-17 |
Measurement technique research for the absorptivity of cryogenic radiometer absorbing cavity at the 4 K temperature |
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| Affiliation: | 1.MOE Key Laboratory of Optoelectronic Imaging Technology and System, Beijing Institute of Technology, Beijing 100081, China2.Xi′an Institute of Applied Optics, Xi′an 710065, China3.Chongqing Institute of Green Intelligent Technology, Chinese Academy of Sciences, Chongqing 710699, China |
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| Abstract: | In order to realize measuring the absorptivity of cryogenic radiometer absorbing cavity at the 4 K temperature, a method of measuring the absorptivity with variable temperature is researched. By designing reflection monitoring components in front of the Brewster window of the cryogenic radiometer, and controlling the cryogenic radiometer to work in a vacuum environment of 10?6 Pa, then adjusting the refrigeration temperature of the cryogenic radiometer, the reflection signals of the cryogenic radiometer absorbing cavity are measured at 632.8 nm under room temperature and different temperature conditions. Combined with the measurement results of the reflectance at 632.8 nm of the cryogenic radiometer absorbing cavity at room temperature using the traditional integrating sphere method, the absorptivity of the cryogenic radiometer absorption cavity can accurately obtain under different temperature conditions through calculations. The experimental measuring the absorptivity of the absorbing cavity at room temperature and 4 K temperature, the absorptivity is 0.99976 and 0.999 71, respectively. The measurement uncertainty of the absorptivity of the cryogenic radiometer absorption cavity at the 4 K condition is evaluated, and the results obtained show that the relative expanded uncertainty is 0.005%(k=2). |
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