采用单透镜型的传像系统研究分析了在同轴粒子场全息诊断中4f透镜组的特有作用(即4f光学透镜组的放大率对每个位置的粒子均为同一常数)是否为4f透镜组特有。实验结果表明,在记录面与透镜的位置相对固定的前提下,采用单透镜型光学系统记录的全息图同样可以用平面波进行高精度再现,而且其放大率与记录对象的物距无关。故在粒子场同轴全息诊断中4f的上述优势并非4f特有,即采用单透镜型成像系统进行粒子场记录时无须使用不同的再现或粒子尺寸标定方法。

We use single-lens imaging system to analyze whether the specific function of 4f lenses system in the particle field in-line holographic diagnosis (ie, the magnification of 4f lenses system is the same constant for each position of the particles) is unique or not to 4f lenses system. The experimental results show that when the positions of the recording surface and the lens are relatively fixed, the hologram recorded by the single-lens optical system can also be precisely reproduced by the plane wave, and its magnification has nothing to do with the object distance of the object. So we can see that the above advantages of 4f in particle field in-line holographic diagnosis are not unique to the 4f. That is to say, we record the particle field by a single-lens imaging system without different reproduction or particle size calibration methods.