激光与光电子学进展, 2018, 55 (5): 051204, 网络出版: 2018-09-11
大型槽式太阳能反射镜面摄影测量方法 下载: 1318次
Photogrammetric Method for Large Trough Solar Reflector
测量 槽式太阳能反射镜 面形检测 大尺寸摄影测量 相对定向 光束平差 measurement trough solar reflector shape detection large scale photogrammetry relative orientation bundle adjustment
摘要
大型槽式太阳能反射镜面尺寸大,对测量精度要求高,需要高精度的测量方法完成对其面形的三维重构。为了提高反射镜面形检测的精度和效率,提出并实现了一种基于大尺寸摄影测量技术的大型槽式太阳能反射镜面检测方法。针对大型槽式太阳能反射镜面,该方法首先利用凸包检测法筛选不共线的像点对,然后利用五点相对定向方法求解相机相对外参数以及利用光束平差方法对测量点的三维坐标进行优化迭代,最后将测量点拟合的抛物曲面的信息和反射镜的设计参数进行对比分析,从而完成大型槽式太阳能反射镜面的面形检测。利用该方法在尺寸为12.0 m×5.7 m×1.4 m的槽式太阳能反射镜上进行测量实验,结果表明反射镜上的测量点的均方根误差不超过0.033 mm,拟合曲面的z 轴误差平均值和标准差分别为1.050 mm和1.466 mm,这些数据可以满足大型太阳能反射镜面形检测精度的要求,验证了摄影测量方法的可行性。
Abstract
Large trough solar reflector surface has large size and high measurement accuracy requirements, which needs high precision measurement method to reconstruct its 3D shape. In order to improve the detection accuracy and efficiency of the large trough solar reflector surface, a large trough solar reflector shape detection method is proposed and implemented based on large scale photogrammetry technology. In the view of the large trough solar reflector surface, at first the convex envelope detection method is used to select non-collinear image points, then the five points relative orientation method is used to solve the relative external parameters of the cameras and the bundle adjustment method is implemented for the optimization iteration of 3D coordinates of measuring points. Finally, the information of the parabolic surface fitted by the measuring points and the design parameters of the reflector are compared and analyzed, then the shape detection of large trough solar reflector surface is completed. Using the proposed method, a measurement experiment is conducted on the trough solar reflector with the size of 12.0 m×5.7 m×1.4 m, the results show that the root mean square error of the measuring points on the reflector is less than 0.033 mm, the average z-axis error and the standard deviation of the fitted parabolic surface are 1.050 mm and 1.466 mm, respectively. These data can meet the surface shape detection accuracy requirements of large trough solar reflector, and the feasibility of the photogrammetry method is verified.
王君, 董明利, 李巍, 孙鹏. 大型槽式太阳能反射镜面摄影测量方法[J]. 激光与光电子学进展, 2018, 55(5): 051204. Jun Wang, Mingli Dong, Wei Li, Peng Sun. Photogrammetric Method for Large Trough Solar Reflector[J]. Laser & Optoelectronics Progress, 2018, 55(5): 051204.