Zhou Jingjing, Hao Xiaopeng, Song Jian, Xie Chenyu, Liu Yang, Wang Xia
Opt Express. 2021 Apr 12;29(8):12344-12356. doi: 10.1364/OE.420272.
The vacuum radiance temperature standard facility (VRTSF) is used to determine the temperature traceability of calibration blackbodies accurately for infrared remote sensing. However, the internal surfaces of the VRTSF can emit thermal radiation, which introduces stray light and reduces measurement accuracy. Previously, background subtraction was used to eliminate stray light, without considering dynamic changes in the environment. Therefore, we propose a changeable veiling glare index (CVGI) to evaluate stray light performance based on the concept of the veiling glare index. We analyze the radiation model of the VRTSF system and simulate the attribution of stray light. CVGI can be improved considerably by cooling and by using suitable stop sizes. Experiments performed in the VRTSF show that the CVGI is suitable for analyzing stray light. Using the CVGI, we simulate a method that can significantly reduce stray light in the VRTSF.
真空辐射温度标准装置（VRTSF）用于精确确定用于红外遥感的校准黑体的温度溯源性。然而，VRTSF的内表面会发射热辐射，这会引入杂散光并降低测量精度。以前，采用背景减法来消除杂散光，但未考虑环境的动态变化。因此，我们基于杂光指数的概念提出了一种可变杂光指数（CVGI）来评估杂光性能。我们分析了VRTSF系统的辐射模型并模拟了杂散光的来源。通过冷却和使用合适的光阑尺寸可以显著提高CVGI。在VRTSF中进行的实验表明，CVGI适用于分析杂散光。使用CVGI，我们模拟了一种可以显著降低VRTSF中杂散光的方法。
