Method for realizing large-phase reconstruction of single digital hologram by adopting intensity transmission equation

A technology of digital hologram and transmission equation is applied in the field of realizing large phase reconstruction of a single digital hologram by using the intensity transmission equation, which can solve problems such as reducing the amount of collected data, avoid human error or mechanical system error, and simplify the measurement process. , the effect of avoiding noise error

Active Publication Date: 2016-10-26
SHANGHAI UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for realizing large phase reconstruction of a single digital hologram by using the intensity transfer equation to solve the shortcomings of the existing phase reconstruction technology. The main advantage of this method is to overcome the depth of phase reconstruction in digital holography technology. It is limited to the micron range and the phase needs to be unwrapped. It also simplifies the data acquisition method of the traditional phase reconstruction measurement process, reduces the amount of collected data, and reduces the amount of introduced errors.
After the intensity information reconstruction is completed, the three intensity reconstruction maps are substituted into the intensity transfer equation as input data to complete the phase reconstruction

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  • Method for realizing large-phase reconstruction of single digital hologram by adopting intensity transmission equation
  • Method for realizing large-phase reconstruction of single digital hologram by adopting intensity transmission equation
  • Method for realizing large-phase reconstruction of single digital hologram by adopting intensity transmission equation

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Embodiment 1

[0019] join Figure 1 ~ Figure 3 , this paper uses the intensity transfer equation to realize a large phase reconstruction system for a single digital hologram, and uses a single-beam coaxial or double-beam off-axis holographic recording system to obtain a single digital hologram of the measured object; the obtained single digital hologram The hologram is used as the input data source, and the reconstruction algorithm is used to reconstruct the focused and positive and negative defocus intensity images; finally, the obtained focus and positive and negative defocus intensity images are substituted into the intensity transfer equation, and the phase of the measured object can be obtained by solving the intensity transfer equation information.

Embodiment 2

[0021] This embodiment is basically the same as Embodiment 1, and it is characterized by the introduction of digital holography technology, which quantitatively restores a larger range of object phases through a single image acquisition and avoids the cumbersome and complicated unwrapping steps in the traditional holographic phase reconstruction process; secondly, due to The whole process does not require any mechanical movement and adjustment, so the human error or mechanical system error caused by mechanical movement is avoided, and a simple, high-speed, effective, stable and practical new method idea is provided for large-scale phase reconstruction and recovery.

Embodiment 3

[0023] This embodiment is basically the same as Embodiment 1, and is characterized in that in order to reduce the noise in the reconstructed intensity image of a single digital hologram and improve the phase reconstruction quality, a dual-beam off-axis holographic system is selected: the light emitted by the laser light source (1) is beam-expanded L1, filtering and collimation system L2 form a plane wave, the plane wave is divided into two beams of light waves by the beam splitter BS3, one beam is used as a reference beam reflected by the mirrors M2 and M4 to the beam splitter BS4, and then reflected into the CCD; the other beam of light waves After mirrors M2 and M3, the measured sample is directly irradiated to form an object light wave, which is transmitted into the CCD plane through the beam splitter BS4, and merges and interferes with the reference light wave to form an off-axis hologram.

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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 large phase reconstruction method for a single digital hologram by using 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 solution of ...

Claims

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Application Information

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Patent Type & Authority Applications(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
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