摘要
为实现对样品的双向反射分布函数(Bidirectional Reflectance Distribution Function,BRDF)的测量,设计了一种少光线遮拦、大回转半径和高定位精度的测量装置。根据测量空间和角度需要,设计了大回转半径(1.3 m)的方位圆环轨道和天顶弧形轨道。轨道外侧安装同步齿形带,采用伺服电机驱动带轮分别实现两个方向的运动。安装在天顶弧形轨道的探测器对位于装置中心的样品在方位角±180°,天顶角±75°范围内进行探测。为避免在大尺寸结构下的运动卡滞,设计了基于弹簧预紧的防卡死机构,并对机构引入的指向精度进行误差分析,最后对测量装置的指向精度进行了测量。实验结果表明:BRDF测量装置方位轨道指向精度优于0.147°,天顶轨道指向精度优于0.358°,测量结果与分析结果相符,验证了所设计的BRDF测量装置能够满足指标要求。
To measure the bidirectional reflectance distribution function(BRDF) of the sample, measuring device with less light obscuration, large gyration radius and high positioning accuracy was designed.According to the requirement of measurement space and angle, the azimuth circle rail(Radius 1.3 m) and the zenith arc rail were designed to provide rotary orbit. Synchronous toothed belt were attached to the rails. Servo motors were assembled to realize the motion in two directions. The detector was installed on the zenith arc rail to achieve the sample detection in the range of ±180° azimuth angle and ±75° zenith angle. To avoid motion lag in the large size structure, the anti-jamming mechanism based on preloaded springs were designed, and the error analysis of introduced pointing accuracy was carried out. Finally, the pointing accuracy of the measuring device was measured. The experimental results show that the azimuth and zenith pointing accuracy of the measuring device is better than 0.147° and 0.358° separately. The measurement results are in agreement with the analysis results, which verifies that the designed BRDF measuring device meets the requirements of the indicators.
作者
马磊
张子昂
Ma Lei;Zhang Zi′ang(Changchun Observatory, National Astronomical Observatories, Chinese Academy of Sciences, Changchun 130017, China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2019年第5期167-172,共6页
Infrared and Laser Engineering
基金
国家自然科学基金(11673082)
关键词
双向反射分布函数
指向精度
误差分析
大尺寸结构设计
bidirectional reflectance distribution function
pointing accuracy
error analysis
large size mechanism design
