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Correction of cavity absorptance measure method for cryogenic radiometer

机译：低温辐射计腔吸收率测量方法的校正

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摘要

As the reference detector of absolute radiance calibration primary radiometer (ARCPR) for space remote sensing, total solar irradiance (TSI) cavity is investigated to ensure the measurement accuracy. TSI cavity adopts a sloping bottom cavity. The geometrical parameters and paint material of sloping bottom cavity are both optimised to improve the invariance of absorptance in the environment of ground and space. The optimisation of substitution method is proposed to measure the average absorptance by two-dimensional scan. The uniformity is evaluated by absorptance map. Experimental results illustrate that sloping bottom cavity has a super-high absorptance of 0.999928 (wavelength is 632 nm), and the relative measure uncertainty is approximated to 6 ppm. Meanwhile, compared with the absorptance map of conical cavity, the sloping bottom design improves the uniformity of absorptance. Therefore, the sloping bottom cavity can be adopted as the reference detector of ARCPR. Furthermore, the optimised substitution method is suitable for the investigation of the blackbody cavity with super-high absorptance.
机译：作为用于空间遥感的绝对辐射定标一次辐射计（ARCPR）的参考检测器，研究了总太阳辐射（TSI）腔以确保测量精度。 TSI腔体采用倾斜的底部腔体。倾斜底腔的几何参数和涂料都经过优化，以改善地面和空间环境下的吸收率不变性。提出了替代方法的优化方法，以二维扫描法测量平均吸收率。通过吸收率图评估均匀性。实验结果表明，倾斜的底部腔体具有0.999928（波长为632 nm）的超高吸收率，相对测量不确定度约为6 ppm。同时，与锥形腔的吸收率图相比，倾斜底部设计提高了吸收率的均匀性。因此，倾斜的底腔可以用作ARCPR的参考检测器。此外，优化的置换方法适用于研究超高吸收率的黑体腔。

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