A Fast Convergent Stack Imaging Device for Simultaneously Acquiring Dual Defocus Diffraction Patterns

Abstract

The invention discloses a fast convergent layered imaging device for synchronously collecting double defocus diffraction patterns, comprising a light source, a focusing lens, a sample and a beam splitting prism arranged in sequence. , divided into two parts of transmission and reflection by the beam splitting prism, the first CCD and the second CCD are respectively placed in the positions where the transmission and reflection optical paths are different from the focus of the focused beam, wherein the first CCD is placed in front of the focusing point, and the second CCD is placed behind the focal point. The invention utilizes a focusing lens, a beam splitting prism and two CCDs to achieve synchronous acquisition of multiple images with multiple defocus amounts, and substitutes the acquired image information into the light intensity transmission equation to obtain the complex amplitude information of the CCD surface, and utilizes the information Constructing a reasonable initial guess value of the test object and substituting it into the stack imaging algorithm can greatly shorten the iteration time.

Description

technical field [0001] The invention relates to a fast convergence lamination imaging device, in particular to a rapid convergence lamination imaging device for synchronously collecting double defocus diffraction patterns. Background technique [0002] In order to obtain the phase information of the object and expand the application of coherent diffraction imaging technology, the Rodenburg team at the University of Sheffield proposed the stacked imaging method (PIE) in 2004. This method uses a two-dimensional moving illumination probe to overlap and scan the sample. Redundancy of adjacent scans and alternate projection iterations enable large field of view imaging of the sample. Compared with the traditional coherent diffraction imaging technology, this method has faster convergence speed, larger imaging field of view, and stronger robustness. [0003] In order to further improve the convergence speed of stack imaging and shorten its iterative calculation time, domestic and...

AI Technical Summary

Problems solved by technology

Another category is to construct reasonable initial guesses and probes. For example, in the article Single-shot ptychographic iterative engine based on chromatic aberrations published by Jiantai Dou et al. in 2019, the spectral synthesis method was used to construct reasonable initial guesses to achieve Fast convergence of the algorithm, but this method is only suitable for RGB and multi-wavelength lighting

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