Coherent diffraction imaging method and its processing equipment

Abstract

The invention discloses a coherent diffraction imaging method and processing device thereof. The object wave passes through a rotary multi-pinhole plate. The Fraunhofer diffraction intensity distribution pattern of the object wave passing through the multi-pinhole plate is recorded by an image sensor. The diffraction intensity distribution is subjected to inverse Fourier transformation to obtain the correlation function pattern of the recorded object wave, the amplitude and phase information of the object wave to be measured are directly extracted from the points corresponding with each measurement pinhole center position coordinate in the correlation function pattern and the diffraction imaging of the complex amplitude object is realized in the computer. The coherent diffraction imaging method has no need of any iterative process and greatly reduces the requirement of the scanning recording process and positioning accuracy and increases the diffraction imaging speed, with other features of simple processing device, convenient adjustment, lower cost, suitable of various different light source, and the imaging of the complex object or three-dimensional object can be realized without imaging lens, especially suitable for the situation that it is difficult to prepare high-quality X-ray using the imaging lens.

Description

technical field [0001] The invention relates to a coherent diffraction imaging technology, in particular to a coherent diffraction imaging method and a processing device for realizing the recording and reproduction of general complex amplitude objects by using a multi-pinhole plate. Background technique [0002] Coherent diffraction imaging is a technology that utilizes the far field of object waves or the intensity distribution of Fraunhofer diffraction to realize imaging of complex or three-dimensional objects. Because it can avoid the limitations of imaging lens aperture and aberration on resolution, this technology is especially suitable for fields such as x-rays and electron beams that lack or are difficult to produce high-quality imaging lenses. The key problem of coherent diffraction imaging technology is how to accurately and quickly recover the amplitude and phase information of the measured object wave from one or more diffraction intensity patterns. At present, o...

AI Technical Summary

Problems solved by technology

But none of the above techniques can fundamentally avoid the uncertainty of iterative algorithms and iterative results

Its phase recovery process still needs to involve a large number of iterative processes; this means that it is still relatively difficult to achieve dynamic or real-time imaging with these methods

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