根据线性空间不变系统理论和标量衍射理论，用杂光点扩散函数讨论了在光学系统中多次反射和衍射所产生的杂光分布。在此基础上，用物和接收器互相关函数系统地分析了黑斑尺寸、接收小孔光阑尺寸以及黑斑照度对杂光测量的影响 According to the theory of linear space invariant system and scalar diffraction theory, the distribution of stray light caused by multiple reflection and diffraction in optical system is discussed by the stray light scattering function. On this basis, the correlation between the object and the receiver is used to systematically analyze the influence of the size of the black spot, the size of the aperture of the receiving aperture and the illuminance of the black spot on the stray light measurement