采用基于CCD相机和朗伯靶的间接测量方法，对旋转抛物面聚光器焦平面和多个离焦面的能流密度分布进行了测量。研究了系统的标定方法，并对每个面内的光斑特性进行分析。结果表明：通过对各个接收面光斑特性的比较，可以判断聚光器真实焦点的位置；随着接收面离焦量的增大，光斑直径变大，能流密度峰值减小，形状越来越不规则。这项研究为聚光系统的热利用和接收器的设计提供了依据。

The flux density distributions on focal plane and other defocused planes of parabolic concentrator were measured with an indirect method based on a CCD camera and a Lambert target. The systematic calibration method was investigated and the characteristics of the spot on every plane were analyzed. The experiment results show that the position of real focus can be obtained by comparing the spot characteristics on each plane; the diameter of the spot is increased, the peak value of flux density is reduced and the shape of the spot becomes more irregular when the amount of defocusing on the receiving plane is increased. The research result can be used for the thermal utilization of the concentrator system and the design of the receiver.