黑体腔底真实温度及均匀性是影响空腔发射率评价的关键因素,然而,现有研究对于温度均匀性的表征多基于亮度温度。应用一种能够免发射率进行温度测量的主动式激光辐射测温技术,开展针对973K的黑体辐射源腔底的表面真实温度及均匀性测量研究;同时基于实测温场数据,采用蒙特卡洛法对空腔有效发射率分布进行数值模拟,获取典型位置的模拟结果,结合亮度温度数据得到腔底真实温场。与主动式激光辐射测温法的表面真实温度直接测量结果进行对比,结果表明:对于所选的9个测量点,两者的相对偏差在0.04%～0.77%之间,良好的一致性验证了主动式激光辐射测温技术在黑体辐射源腔底的真实温度测量中的可行性。
Abstract
The true temperature and uniformity of the blackbody cavity bottom are the key factors affecting the evaluation of the cavity emissivity, but the existing studies for the temperature uniformity characterization are mostly based on the brightness temperature. An active laser radiation thermometry technique, which is capable of emissivity-free temperature measurement, is applied to carry out a study on the real surface temperature and uniformity measurement of the cavity bottom of a blackbody radiation source in 973K. Meanwhile, based on the measured temperature field data, the Monte-Carlo method was used to numerically simulate the effective emissivity distribution of the cavity, obtaining the simulation results at typical positions and combining with the bright temperature data to obtain the true temperature field at the bottom of the cavity. And compared with the direct measurement results of the surface real temperature by active laser radiation thermometry, the results show that for the nine selected measurement points, the relative deviations of the two are between 0.04% and 0.77%. The good agreement verifies the feasibility of the active laser radiometric thermometry technique for true temperature measurements at the bottom of the cavity of a blackbody radiation source.
关键词
辐射测温 /
黑体辐射源 /
温场 /
红外激光 /
蒙特卡洛法
Key words
radiation thermometry /
blackbody radiation source /
temperature field /
infrared laser /
Monte-Carlo method
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基金
国家重点研发计划(2022YFF0610804);财政部公益性科研项目(AKYZZ2105)
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