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Imaging-view-field-increase-oriented lamination scanning digital holography

A digital holography and stacking technology, applied in the field of digital holography, can solve the problems of difficult field of view stitching and increased difficulty of two-dimensional image fusion, etc.

Inactive Publication Date: 2014-06-04
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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Problems solved by technology

However, in these methods, because the holograms of different sample regions are recorded, field stitching becomes a more prominent and difficult problem.
Especially when there are some movement errors in the system, the difficulty of 2D image fusion will be further increased

Method used

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0048] Such as figure 1 As shown, the present invention includes the following steps: (1) moving the sample to be tested in a stacked scanning manner; (2) recording the hologram at each scanning position with an image sensor; (3) processing the hologram in a computer; (4) Iterative reconstruction to complete large field of view complex amplitude imaging.

[0049] Figure 2a and Figure 2b They are the optical path structure diagrams of two typical implementations of the imaging method of the present invention in transmission and reflection coaxial phase-shift digital holography respectively. The structure includes a laser 1 , a collimating beam expander system 2 , a beam splitter 3 , a mirror 4 , a piezoelectric ceramic mirror 5 , a two-dimensional translation platform 6 , an image sensor 7 and a computer 8 . The distance from the translation platfo...

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Abstract

The invention discloses an imaging-view-field-increase-oriented lamination scanning digital holography. According to the imaging-view-field-increase-oriented lamination scanning digital holography, samples to be measured are sequentially moved transversely in a measuring plane in a lamination scanning mode, and corresponding holograms are recorded with an image sensor. The recorded series holograms are processed with a digital holography reconstruction algorithm based on lamination scanning, and complex amplitude images of increased view fields of the samples to be measured can be obtained. Information redundancy constraints of adjacent view fields are provided through lamination scanning, so that the problems of view field splicing and image fusing in large-view-field digital holography imaging are solved. Meanwhile, the convergence rate and the noise jamming resisting capacity of lamination iteration are substantially improved through the holographic record data processing mode. The imaging-view-field-increase-oriented lamination scanning digital holography is high in imaging efficiency, good in transportability and suitable for phase position quantitative measurement and microimaging of various transmission type or reflection type objects.

Description

technical field [0001] The invention relates to a digital holography for expanding the field of view, in particular to a digital holography for expanding the field of view by translating a sample to be measured in the manner of stacked scanning (Ptychographic scanning) within the object plane. Background technique [0002] Digital holography (Digital Holography) uses a digital camera (such as a CCD) instead of a photographic dry plate to take a hologram of an object, eliminating the need for chemical wet processing. Its biggest advantage is that it can directly quantitatively analyze the amplitude and phase of the sample to be measured on the computer, and it can also conveniently suppress some error information in the detection process, which has aroused great research interest of scholars in the industry and obtained With rapid development, it has broad application prospects in the fields of three-dimensional shape measurement, biological microscopic imaging and particle f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/08G03H1/22G03H1/26
Inventor 史祎诗高乾坤王雅丽李拓
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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