Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Larger Phase Reconstruction Method of Single Digital Hologram Based on Intensity Transfer Equation

A technology of digital hologram and transmission equation, which is applied in the field of large phase reconstruction, and can solve problems such as the influence of defocus error and the complexity of unwrapping algorithm

Active Publication Date: 2019-06-25
SHANGHAI UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Digital holography technology, as an optical non-destructive testing technology with rapidity, globality and digital focusing function, is a very effective microscopic quantitative detection method, but the disadvantage is that the traditional reconstruction algorithm is essentially based on the plane diffraction theory. What is obtained is the wrapped phase, and the unwrapped algorithm is usually very complicated and needs to compensate for the error, and the phase that can be reconstructed corresponds to the measured axial depth only in the micron range
However, the existing intensity transfer equations need to move the measured object or the image collector multiple times during the experiment to complete the information acquisition, so the phase reconstruction results are affected by the defocus error.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Larger Phase Reconstruction Method of Single Digital Hologram Based on Intensity Transfer Equation
  • Larger Phase Reconstruction Method of Single Digital Hologram Based on Intensity Transfer Equation
  • Larger Phase Reconstruction Method of Single Digital Hologram Based on Intensity Transfer Equation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] The intensity transmission equation realizes a larger phase reconstruction system of a single digital hologram, and different optical path systems of a single digital hologram can be selected according to the characteristics of the object to be reconstructed. The specific implementation flow chart of this invention is as attached image 3 shown.

[0017] When the phase information of the object to be reconstructed is relatively simple, a single-beam coaxial holographic recording system can be used. The monochromatic laser light emitted by the He-Ne laser source forms a plane wave after beam expansion, filtering and collimation system (i.e. mirror M1, lens L1 and L2). When the diffracted wave meets the direct light wave and interferes, a coaxial hologram is formed, and the image recording system records a single coaxial hologram.

[0018] When the phase information of the object to be reconstructed is complex, sensitive to interference such as noise, or has high requir...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for realizing large-phase reconstruction of a single digital hologram by adopting an intensity transmission equation. The method comprises the steps of building a single-beam or dual-beam plane wave hologram recording system, taking d as the recording distance, and acquiring a digital hologram containing intensity and phase information of a measured objected; realizing numerical reconstruction of the digital hologram by respectively using three different reconstruction distances (d'-deltad), d' and (d'+deltad), and acquiring intensity images of the measured object on three planes; taking the three intensity images as a data source, substituting the three intensity images into the intensity transmission equation, solving the intensity transmission equation by using a Green function model, and acquiring phase distribution of the measured object on an imaging plane. According to the invention, phase reconstruction in the single hologram is realized by using the intensity transmission equation, and a step of unwrapping in the traditional holographic phase reconstruction process is avoided, thereby being not restricted by the depth of traditional holographic phase reconstruction, and thus being capable of realizing large-phase reconstruction.

Description

technical field [0001] The invention relates to a large phase reconstruction method, in particular to a method for realizing large phase reconstruction of a single digital hologram by an intensity transmission equation. Background technique [0002] Digital holography technology, as an optical non-destructive testing technology with rapidity, globality and digital focusing function, is a very effective microscopic quantitative detection method, but the disadvantage is that the traditional reconstruction algorithm is essentially based on the plane diffraction theory. What is obtained is the wrapping phase, and the unwrapping algorithm is usually very complicated and needs to compensate for the error, and the reconstructed phase corresponding to the measured axial depth is only in the micron range. [0003] The intensity transfer equation phase reconstruction technique is a non-interference quantitative phase recovery method gradually formed on the basis of the imaginary solut...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G03H1/04G03H1/08
CPCG03H1/0443G03H1/0866
Inventor 周文静彭克琴吴煜郑财富张伟
Owner SHANGHAI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products