光学扫描全息术的推广

给出了光学扫描全息术的基本原理。记录时用实时 FZP与物体强度透射率发生卷积从而产生扫描全息图 ;再现时用与记录时相对应的 FZP与全息图信号发生卷积即可再现出物体的信息。推广了光学扫描全息术 ,提出只要某一实时的光场强度分布函数具有如下性质 :(l)该函数中含有 x,y,z参量且相对于 z参量具有圆对称性 ;(2 )对于某一确定的 z参量 ,该函数的自相关是δ函数 ,就可以把该光场作为光学扫描全息术中的照明光场对物体进行扫描记录以得到扫描全息图。

Generalization of the optical scanning holography

The optical scanning holography is given as the following: at the recording sta ge, a real time Fresnel Zone Plate (FZP) is used to scan an object to make the i ntensity distribution of the FZP convolute with the intensity transmissivity of the object, then a photodetector detects the convolution and converts it to dig ital data, the holographic information, to be stored in the computer. At the re co nstruction stage, another FZP signal generated by the computer convolutes with t he stored holographic data resulting in the reconstructed information of the obj ect at a particular crosssection corresponding to the parameters of the second F ZP. A generalizing optical scanning holography is proposed, which says that any real-time optical intensity distribution function can be acted as the optical field to scan the object for obtaining the holographie information, if it has t he following characterics:(1) it is the function of x,y, z with circle symme try of z;(2) for a given z, its autocorrelation is a δ function.