Coquand Mathieu, Henault François, Caliot Cyril
Appl Opt. 2017 Mar 1;56(7):2029-2037. doi: 10.1364/AO.56.002029.
This paper describes a backward-gazing method for measuring the optomechanical errors of solar concentrating surfaces. It makes use of four cameras placed near the solar receiver and simultaneously recording images of the sun reflected by the optical surfaces. Simple data processing then allows reconstructing the slope and shape errors of the surfaces. The originality of the method is enforced by the use of generalized quad-cell formulas and approximate mathematical relations between the slope errors of the mirrors and their reflected wavefront in the case of sun-tracking heliostats at high-incidence angles. Numerical simulations demonstrate that the measurement accuracy is compliant with standard requirements of solar concentrating optics in the presence of noise or calibration errors. The method is suited to fine characterization of the optical and mechanical errors of heliostats and their facets, or to provide better control for real-time sun tracking.
本文描述了一种用于测量太阳能聚光表面光机误差的后视方法。该方法利用放置在太阳能接收器附近的四个摄像头，同时记录光学表面反射的太阳图像。然后，通过简单的数据处理即可重建表面的斜率和形状误差。在高入射角的太阳跟踪定日镜的情况下，使用广义四象限探测器公式以及镜子的斜率误差与其反射波前之间的近似数学关系，增强了该方法的创新性。数值模拟表明，在存在噪声或校准误差的情况下，测量精度符合太阳能聚光光学的标准要求。该方法适用于精细表征定日镜及其小平面的光学和机械误差，或为实时太阳跟踪提供更好的控制。
