塔式太阳能热发电站的定日镜场向塔顶吸热器聚光，在吸热器采光面形成高强度非均匀能流密度，且能流密度分布随时间不断变化。针对大面积吸热器采光面聚光能流密度分布的动态测量问题，本项目提出基于实时边界能流信息的通用边界插值重建成像方法。大量实验证明，当定日镜场单目标点跟踪聚光时，聚光能流密度分布总接近某个椭圆形高斯分布；吸热器采光面上的能流密度分布，可由矩形区域边界上实测的能流密度值直接边界插值重建。若定日镜场多目标点跟踪聚光，或聚光能流密度分布与椭圆形高斯分布偏差较大时，可用多个适合边界插值重建的二元函数的混合形式最佳拟合，再间接地边界插值重建聚光能流密度分布，即分别直接插值重建，再叠加合成。本项目依托八达岭塔式太阳能热发电站，通过多工况的先验月光聚光实验，间接获得一些典型的定日镜场聚光能流密度分布；在对典型聚光能流密度分布分工况拟合的基础上，实现基于实时边界能流信息的边界插值重建成像方法。

When a solar tower power plant is in the normal working state, the concentrated solar flux density over the receiver aperture by the heliostat field is high, non-uniform and changing with time. Thus, the project applicant has proposed a general dynamic imaging method of concentrated solar flux density over the large-are receiver aperture from the measured flux density values from the sensors on the aperture boundaries by the boundary interpolation reconstruction technique. As experiments show, when the heliostat field concentrates the sun lights onto the receiver aperture with one aiming point only, the concentrated solar flux density distribution is always close to an elliptical-Gaussian distribution. In this case, the concentrated solar flux density on the receiver aperture of a rectangular area can be fully mapped from the measured solar flux density values on the region border by the boundary interpolation reconstruction technique. When the heliostats in the field track the sun with multiple aim points on the receiver aperture, or the concentrated solar flux density distribution much a bit deviates from an elliptical-Gaussian distribution, the flux density distribution can be best fitted with a mixture of several bivariate functions which are suitable for interpolation reconstruction. Thus, the flux density distribution for each component function can be reconstructed separately, and then the sum of the reconstructed flux density distributions gives the total flux density distribution on the receiver aperture. This project will use the test plant of Badaling solar thermal tower. The moonlight concentrating tests of the heliostat field will be carried out in some clear nights, following the working modes of the solar tower in daytime. Then some typical concentrated solar flux density distributions are indirectly measured (or estimated). Based on the fitting expressions and knowledge of the typical solar flux density distribution of the receiver aperture on the tower, the dynamic solar flux density distribution on the receiver aperture can be mapped from the real-time flux density readings on the rectangular region borders using the boundary interpolation reconstruction technique.