对于实际光学系统，由于光的衍射和像差，使所成的点像为一弥散斑。
However, for the actual optical system, its point image become a speckle because of diffraction of light and aberration.
通过对CCD上弥散斑中心位移的测量，就可精确计算出火车车轮的磨损量。
By measurement the displacement of the defocused spots center on CCD, the abrasion of the train wheel train wheel is calculated.
实验发现，随电压的升高，六边形斑图是由弥散放电模式演化而成。
It is found that the hexagon pattern is transformed from diffuse mode by increasing the applied voltage.
应用推荐