4F傅里叶变换透镜系统对粒子场全息记录的影响

 4F傅里叶变换透镜系统在空间滤波和光学信息处理中,被广泛用来处理二维透光物体。但在实际应用中,4F系统也被用于三维场的研究。例如三维粒子场的全息记录。由于全息记录的特点,要求了解经4F系统转换后的粒子物光场,以确定粒子场的空间分布。而目前4F系统在粒子场全息记录的应用基础均借助对二维物场的研究理论。本文讨论了经4F系统转换后的三维粒子物光场的特点以及对全息记录的影响。

THE EFFECT OF 4F FOURIER LENS SYSTEM ON THE HOLOGRAPHIC MEASUREMENT OF PARTICLES FIELD

4F Fourier lens system is often used in holography. The transforming process of particle field in the system was examined in particle diffraction instead of geometric imaging in this paper. The imaging field of particles can be found in space of back lens. If recording plane is located among the image field, particle image and diffraction fringe from both side of the plane will be recorded. The resolution of the image and diffraction fringe is very high. However, the feature of double directional conjugate diffraction in the image field will confuse the real location of the particles in the process of reappearance.