Application of fractal masks with spiral phase distribution for the determination phase discontinuities in transparent objects

摘要

In this paper we propose the new method of nondestructive checking, based on application of the complex fractal masks with fractal amplitude part and spiral phase distribution photographed through the objects under study. Coherent optical image processing of the fractal masks allow to receive the separate information about components of the refractive index gradient and phase discontinuities. The power of high spatial frequencies of the fractal mask spectrum is ten times greater in comparison with spectrum of regular mask. The analysis of results of the inverse Fourier transform of the distorted spectrum of regular and fractal masks shows that the fractal mask with spiral phase distribution is more sensitive and allows obtain more precisely the value of distortion of the initial object.