基于偏折法的碟式聚光器抛物镜面法向误差快速检测方法  

FAST DETECTION METHOD FOR NORMAL ERROR OFPARABOLIC DISH CONCENTRATOR BASED ON DEFLECTOMETRY

作　　者：刘繁茂[1] 张原愿 廖灿灿 莫寒 Liu Fanmao;Zhang Yuanyuan;Liao Cancan;Mo Han(College of Mechanical Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学机电工程学院,湘潭411201

出　　处：《太阳能学报》2023年第8期367-378,共12页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51576061)。

摘　　要：为实现碟式聚光器抛物镜面的法向误差快速检测,针对单目偏折法缺少深度信息的不足,拟构建一种迭代拟合算法,通过拟合计算得到二次曲面系数,修正镜面坐标系与相机坐标系之间的转换误差,实现对称碟式聚光器抛物镜面的快速定位与法向误差计算。搭建实验平台,进行5次不同位姿的抛物镜面测量实验,获得被测抛物镜面单元的实际法线方向数据,与镜面设计面形的标准法线方向相比,其平均误差为7.3591 mrad;5次测量的抛物镜面法向误差结果相近,其整体标准差为5.0278 mrad;与镜面面形基准数据相比较,验证了该方法测得的法向误差低于20 mrad。实验结果表明该方法可行,且具有快速性和稳定性。To achieve fast detection for normal error of the parabolic mirror of the dish concentrator,for the lack of depth information in the monocular deflectometry method,an iterative fitting algorithm is proposed to correct the conversion error between the mirror coordinate system and the camera coordinate system by fitting the calculated quadratic surface coefficients to realize the fast positioning and normal error calculation of the parabolic mirror of the symmetric dish concentrator.The experimental platform is built and five parabolic mirror measurement experiments with different positions and orientations are conducted to obtain the actual normal direction data of the measured parabolic mirror.Compared with the standard normal direction of the design surface of parabolic mirror,the average error is 7.3591 mrad.Furthermore,the normal error measured in the five measurements is similar,and its overall standard deviation is 5.0278 mrad;The normal error measured by this method is verified to be less than 20 mrad through compared with the reference data of parabolic mirror surface shape.Finally,the experimental results show that the method is feasible,fast and stable.

关 键 词：太阳能热发电 聚光器 碟式 误差检测 相位变换 偏折法 

分 类 号：TH741[机械工程—光学工程]