基于菲涅耳波带板扫描全息术的光学层析成像

基于光学扫描全息术原理和编码孔径层析成像技术，提出了一种三维物体层析成像技术——菲涅耳波带板扫描全息术。该技术通过将物体的光强分布函数与菲涅耳波带板的光强分布函数进行卷积运算来得到物体的扫描全息图，通过相关解卷积的方法来进行扫描全息图的数字重建。依据该技术原理设计了实验系统，系统结构简单紧凑，具有三维物体层析成像功能。提出用数字高通滤波器来减少重建图像的背景噪声。计算机仿真及对实物的扫描记录和重建实验结果表明，该技术原理正确，用于三维物体层析成像是可行的，用数字高通滤波的方法提高重建图像的对比度是有效的。

Optical Tomography Based on Fresnel Zone Plate Scanning Holography

An imaging technique for three-dimensional objects termed Fresnel zone plate scanning holography based on the principle of optical scanning holography and the tomographic technique of coded aperture imaging is proposed. The scanning hologram of an object is the convolution of the transmittance of the object with the intensity distribution of the Fresnel zone plate and the reconstruction of the hologram is obtained by correlation operation. The system based on Fresnel zone plate scanning holography is simple and compact. Especially,it can realize optical tomograms of an object. A method of high-pass filtering is proposed to reduce the background noise of the reconstruction. Both the computer simulations and the experiments demonstrate that the principle of the technique is right,the tomograms of an object is obtained using the technique,and the contrast of the reconstruction is improved with high-pass filtering.