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Three-wavelength digital holographic imaging light path and method based on constraint underdetermined equation

A technology of digital holography and imaging method, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of difficult to realize dynamic measurement, unchangeable measurement range, unchangeable measurement range, etc., achieve good imaging effect and improve accuracy , the effect of error reduction

Active Publication Date: 2021-03-02
XIAN UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The optical path and method improve the timeliness and operability of the system, improve the need to find two lasers with a small frequency difference or tunable lasers as light sources, overcome the problem that the measurement range cannot be changed, and reduce the impact of noise on the experiment. It avoids the problem that the measurement range cannot be changed and it is difficult to realize dynamic measurement, and makes the specific experimental operation simple and easy to implement

Method used

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  • Three-wavelength digital holographic imaging light path and method based on constraint underdetermined equation
  • Three-wavelength digital holographic imaging light path and method based on constraint underdetermined equation
  • Three-wavelength digital holographic imaging light path and method based on constraint underdetermined equation

Examples

Experimental program
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Effect test

Embodiment 1

[0106] The sample model of the slope is as image 3 shown in image 3In the series of figures, the light source adopts 474nm, 570nm and 632nm, the maximum thickness of the object is 0.03mm, the recording distance and reproduction distance are both 1000mm, 3(a) is the constructed slope model, 3(b) is the dual-wavelength digital holography technology The 3D reconstruction pattern restored when the noise is 50, 3(c) is the 3D reconstruction pattern restored by the new three-wavelength digital holography technology when the noise is 50, the comparison results can show that the three-wavelength digital holography technology is better than the two-wavelength digital holography technology Has good noise immunity.

Embodiment 2

[0108] A sample model of a Gaussian surface such as Figure 4 shown in Figure 4 In the series of figures, the light sources are 474nm, 570nm and 632nm, the maximum thickness of the object is 0.03mm, the recording distance and reproduction distance are both 1000mm, 4(a) is the constructed Gaussian surface model, 4(b) is the dual-wavelength digital holography The three-dimensional reconstruction pattern restored by the technology when the signal-to-noise ratio is 60, and 4(c) is the three-dimensional reconstruction pattern restored by the new three-wavelength digital holography technology when the signal-to-noise ratio is 60. The comparison results can show that the three-wavelength digital holography technology is compared with Dual-wavelength digital holography technology has good noise immunity.

Embodiment 3

[0110] A sample model of a double Gaussian surface such as Figure 5 shown in Figure 5 In the series of figures, the light sources are 474nm, 570nm and 632nm, the maximum thickness of the object is 0.03mm, the recording distance and reproduction distance are both 1000mm, 5(a) is the double Gaussian surface model constructed, 5(b) is the double wavelength digital The three-dimensional reconstruction pattern restored by holographic technology when the signal-to-noise ratio is 60, and 5(c) is the three-dimensional reconstruction pattern restored by the new three-wavelength digital holography technology when the signal-to-noise ratio is 60. Due to the dual-wavelength digital holography technology, it has good noise immunity.

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Abstract

The invention discloses a three-wavelength digital holographic imaging light path and method based on a constraint underdetermined equation. The three-wavelength digital holographic imaging light pathbased on the constraint underdetermined equation comprises a first laser 11, a second laser 12, a third laser 13, a first reflecting mirror 2, a second reflecting mirror 4, a third reflecting mirror7, a fourth reflecting mirror 8, a first beam splitter prism 3, a second beam splitter prism 5, a third beam splitter prism 9, a collimation and beam expansion system 6 and a CCD image sensor 10. By using the three-wavelength digital holographic imaging method based on the constraint underdetermined equation provided by the invention, the anti-noise performance of the traditional digital holographic technology is obviously improved. The method is simple and fast in experimental operation and high in operability, the Fresnel algorithm and the search underdetermined equation set unique solutionsolving algorithm are effectively fused, the measurement range is expanded, and the influence of noise on experiments and the recovery effect of samples are reduced.

Description

technical field [0001] The invention relates to the technical field of optical interference imaging, in particular to a three-wavelength digital holographic optical path and a method, which are realized based on searching for an underdetermined equation group. Background technique [0002] Dual-wavelength digital holography has developed a lot in recent years. It synthesizes an equivalent wavelength by using two beams of different wavelengths. The equivalent wavelength is greater than the maximum optical path difference produced by the beam passing through the object. At this time, the object The obtained phase map is the real phase map of the object, and then the three-dimensional shape of the object can be recovered through the relationship between the phase and the shape of the object, which has been widely used in the detection of biological cells and the volume measurement of the surface shape of objects. [0003] See (Optics express, 27 (22) (2019); Optics and Lasers i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B9/02
CPCG01B9/02047
Inventor 李拓雷文秀董军张朵
Owner XIAN UNIV OF POSTS & TELECOMM
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