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Tracking and shape errors measurement of concentrating heliostats

机译：集中定日镜的跟踪和形状误差测量

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In solar tower power plants, factors such as tracking accuracy, facets misalignment and surface shape errors of concentrating heliostats are of prime importance on the efficiency of the system. At industrial scale, one critical issue is the time and effort required to adjust the different mirrors of the faceted heliostats, which could take several months using current techniques. Thus, methods enabling quick adjustment of a field with a huge number of heliostats are essential for the rise of solar tower technology. In this communication is described a new method for heliostat characterization that makes use of four cameras located near the solar receiver and simultaneously recording images of the sun reflected by the optical surfaces. From knowledge of a measured sun profile, data processing of the acquired images allows reconstructing the slope and shape errors of the heliostats, including tracking and canting errors. The mathematical basis of this shape reconstruction process is explained comprehensively. Numerical simulations demonstrate that the measurement accuracy of this "backward-gazing method" is compliant with the requirements of solar concentrating optics. Finally, we present our first experimental results obtained at the THEMIS experimental solar tower plant in Targasonne, France.
机译：在太阳能塔式发电厂中，诸如定日镜的跟踪精度，刻面未对准和表面形状误差等因素对系统效率至关重要。在工业规模上，一个关键问题是调整多面定日镜的不同反射镜所需的时间和精力，使用当前技术可能要花费数月的时间。因此，能够快速调节具有大量定日镜的场的方法对于太阳能塔技术的兴起至关重要。在此通信中，描述了一种定日镜特性的新方法，该方法利用位于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。根据所测太阳轮廓的知识，对获取的图像进行数据处理可以重建定日镜的坡度和形状误差，包括跟踪误差和倾斜误差。全面解释了此形状重构过程的数学基础。数值模拟表明，这种“向后凝视法”的测量精度符合太阳能聚光光学系统的要求。最后，我们展示了在法国塔加索纳的THEMIS实验太阳能塔工厂获得的第一个实验结果。

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