对物体进行傅里叶变换,取其实部或虚部进行编码。由于位相只有0°和180°两个值,在频谱抽样单元中只处在两个位置上。取各单元透光孔的高度相同,宽度与该单元的振幅值成正比。由各单元透光孔组成的衍射物便称为二元位相计算全息图。在平行光照明下其再现像为原物体及其厄米共轭像。用成像光路可对这种全息图进行复制,有以下要 The object of Fourier transform, take the real or imaginary part of the coding. Since the phase has only two values ​​of 0 ° and 180 °, there are only two positions in the spectral sampling unit. Take the same height of the light transmission hole of each unit, and the width is proportional to the amplitude value of the unit. The diffractive objects composed of light-transmitting holes of each unit are called binary phase-calculated holograms. Under the illumination of parallel light, its reproduction looks like the original object and its Hermitian conjugate image. This hologram can be copied using the imaging light path, as described below