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Optical scanning holographic self-focusing method based on average gradient function

A gradient function and optical scanning technology, applied in the field of optical scanning holography, can solve the problems of self-focusing of overlapping objects, self-focusing of overlapping objects, complicated operation process, etc. Effect

Inactive Publication Date: 2018-06-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the operation process is too cumbersome, the calculation is complicated, and it cannot solve the self-focusing problem of overlapping objects
[0007] Based on the above problems, the present invention proposes an optical scanning holographic self-focusing method based on a mean gradient function, and can solve the self-focusing problem of overlapping objects in a holographic image

Method used

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  • Optical scanning holographic self-focusing method based on average gradient function
  • Optical scanning holographic self-focusing method based on average gradient function
  • Optical scanning holographic self-focusing method based on average gradient function

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Embodiment 1

[0045] The process of the embodiment of the present invention is as follows figure 1 As shown, the basic structure adopted is as follows figure 2 Shown, wherein the wavelength λ=632.8nm of He-Ne laser Laser Laser, the focal length of two convex lenses (L1, L2) is all 400mm, the object to be measured of embodiment one is as image 3 As shown, the cross-section matrix size of the sliced ​​object is 300×300. The reconstruction range of Embodiment 1 is [7mm, 9mm], n=400, and the self-focusing process of the holographic image can be realized according to the following steps:

[0046] Step 1: Acquire Holographic Image

[0047] Such as figure 2 As shown, the angular frequency emitted by the He-Ne laser source is ω 0 The light is split into two beams by the first polarizing beam splitter BS1, wherein the first beam passes through the first pupil function to form a spherical wave; the second beam passes through the acousto-optic modulator to produce a frequency shift of Ω and the...

Embodiment 2

[0057] The wavelength λ=632.8nm of the He-Ne laser Laser in embodiment two, the focal length of two convex lenses (L1, L2) is all 400mm, and the object to be measured of embodiment two is as Figure 7 As shown, the cross-section matrix size of the sliced ​​object is 300×300. The reconstruction range of the second embodiment is [7mm, 9mm1, n=400;

[0058] Figure 8 It is the hologram obtained by the object to be measured in Example 2; Figure 9 It is the self-focusing process of Embodiment 2 of the present invention; Figure 10 Among them, (a) is the reconstructed image of the first layer slice in the second embodiment, and (b) is the reconstructed image of the second layer slice in the second embodiment. The mean gradient function can also achieve precise self-focusing on overlapping objects in the hologram, and the reconstructed image also has high definition.

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Abstract

The invention provides a self-focusing method for obtaining a holographic image through an average gradient function, and belongs to the field of optical scanning holography and self-focusing. The self-focusing problem of the holographic image is mainly solved. Self-focusing is realized by calculating the average gradient function value of the reconstructed image; the self-focusing problem of theholographic image can be effectively solved; meanwhile, the self-focusing problem of other types of images can be solved by means of the average gradient function.

Description

technical field [0001] The invention relates to the fields of optical scanning holography and self-focusing, in particular to an optical scanning holographic self-focusing method based on a mean gradient function. Background technique [0002] Optical scanning holographic technology is an important branch of digital holographic technology. This technology uses optical heterodyne technology and scanning holographic technology to greatly improve the resolution of scanning holographic images. In 1979, Poon and Korpel first proposed this concept . So far, this technology has been widely used in fields such as holographic image encryption, scanning holographic microscopy, and image recognition. [0003] In the field of holographic technology, the reconstruction of hologram has always been a research hotspot, and for holographic reconstruction technology, it is very important to obtain the axial reconstruction distance of the object. Therefore, in recent years, people have done ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/00G03H1/04G03H1/08
CPCG03H1/0005G03H1/0406G03H1/0443G03H1/0866
Inventor 欧海燕刘柯邵维王秉中
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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