本文发现在三维粒子场全息测量中,经4F傅里叶变换,位于系统前焦平面前、后的粒子,在后焦平面的光场分布呈共轭关系.对记录景深和确定粒子空间位置不利.当4F系统采用放大形式,可提高粒子的衍射环可辨变和再现边缘的对比度.但放大倍数大于4,会使粒子记录和再现质量下降.

It has been found that the field distribution of the particles located between the back and front positions of the front fooal plane of the 4 F system has conjugate relationship with the back fooal plane of the system through transformation of 4 F Fourier lens system. This relationship has unfavourable effect on depth of field and determination of the particle position. The fringe visibility and edge contrast of the particles are improved by the amplifying of the lens system. However, the quality of the particle recording and reconstruction will be reduced if the amplifying of the system is beyond 4 times.