连续光谱地表反射特性自动观测辐射计的光机设计

介绍了连续光谱地表反射特性自动观测辐射计(SCR)的光机系统设计.SCR辐射计的光谱范围为400~2 400 nm, 能够实现地表反射率的长期自动观测.所设计的SCR辐射计使用经过定标的漫反射参考板作为反射率标准, 漫反射参考板通过转臂自动切入、切出测量光路.为保证参考板在野外的长期适用性, 设计了参考板清洁机构.对易发生失效的转臂进行静力学分析.结果表明：转轴位置会发生应力集中, 且距离转轴位置越远, 变形量越大, 变形引起的参考板水平误差在0.3°以内, 满足应用需求.为验证SCR辐射计测量数据的准确性和仪器的可靠性, 设计了SCR辐射计和SVC光谱仪的比对试验.试验结果表明：两台仪器所测量的反射率具有相同的变化趋势, 二者偏差普遍在±1%以内, 最大偏差在±3.5%以内.SCR辐射计能够实现较高精度的反射率数据自动测量, 在卫星遥感器外场自动化定标和高频次定标方面具有重要应用前景.

Abstract

The opt-mechanical design of a Spectrally-Continuous Radiometer (SCR) for surface reflectance automation observation was described. Operating in 400~2 400 nm, the SCR can automatically measure the surface reflectance of radiometric calibration site to get continuous and hyperspectral reflectance data. A calibrated white diffused panel was used as the reflectance standard, and the panel was cut into and out of the optical measurement path through a rotatable mechanical arm. An air-cleaning mechanism was designed to keep the panel clean which is very important for the long-term applicability of the SCR in the field. The static analysis was carried out for the rotating arm using the static structural module of ANSYS WORKBENCH, because the roating arm is prone to failure. The results showed that some stress concentrations located at the rotating shaft position, the deformation was larger as farther away from the rotating shaft, and the maximum deformation can caused a inclination within 0.3°. To verify the accuracy and reliability of the SCR, experiment was carried out with SCR and SVC. The results showed that the reflectance measured with two devices had the same trend, the deviation was generally within ±1%, and the maximum deviation was within ±3.5%, which demonstrated that the SCR could achieve highly accurate reflectance data in automation manners and have broad application prospects in field-based automation calibration and high-frequency calibration for satellite-based remote sensors.

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潘琰, 李新, 翟文超, 刘恩超, 张艳娜, 陈媛, 乔延利, 郑小兵. 连续光谱地表反射特性自动观测辐射计的光机设计[J]. 光子学报, 2018, 47(6): 0623002. PAN Yan, LI Xin, ZHAI Wen-chao, LIU En-chao, ZHANG Yan-na, CHEN Yuan, QIAO Yan-li, ZHENG Xiao-bing. Opto-mechanical Design of a Spectrally-continuous Radiometer for Surface Reflectance Automation Observation[J]. ACTA PHOTONICA SINICA, 2018, 47(6): 0623002.

连续光谱地表反射特性自动观测辐射计的光机设计

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