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A three-wavelength digital holographic imaging optical path and method based on constrained underdetermined equation

A digital holography, imaging optical path technology, applied in the direction of using optical devices, instruments, measuring devices, etc., can solve the problems of unchangeable measurement range, unchangeable measurement range, difficult to achieve dynamic measurement, etc., to reduce the impact of noise on experiments and , Improve the effect of anti-noise performance and accuracy improvement

Active Publication Date: 2022-07-05
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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  • A three-wavelength digital holographic imaging optical path and method based on constrained underdetermined equation
  • A three-wavelength digital holographic imaging optical path and method based on constrained underdetermined equation
  • A three-wavelength digital holographic imaging optical path and method based on constrained underdetermined equation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] Sample models of inclined planes such as image 3 shown in image 3In the series of pictures, 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 three-dimensional reconstruction pattern recovered when the noise is 50, 3(c) is the three-dimensional reconstruction pattern recovered 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 compared with 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 pictures, 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, 4(a) is the constructed Gaussian surface model, 4(b) is the dual-wavelength digital holography The three-dimensional reconstruction pattern recovered by the technology when the signal-to-noise ratio is 60, and 4(c) is the three-dimensional reconstruction pattern recovered 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 pictures, 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, 5(a) is the constructed double Gaussian surface model, 5(b) is the double-wavelength digital The 3D reconstruction pattern restored by the holography technology when the signal-to-noise ratio is 60, 5(c) is the 3D reconstruction pattern restored by the new three-wavelength digital holography technology when the signal-to-noise ratio is 60. The comparison results can illustrate the comparison of the three-wavelength digital holography technology It has good noise immunity for dual-wavelength digital holography technology.

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Abstract

The invention discloses a three-wavelength digital holographic imaging optical path and method based on a constrained underdetermined equation. The three-wavelength digital holographic imaging optical path based on constrained underdetermined equation includes a first laser 11, a second laser 12, a third laser 13, a first mirror 2, a second mirror 4, a third mirror 7, and a fourth reflection Mirror 8 , first dichroic prism 3 , second dichroic prism 5 , third dichroic prism 9 , collimating beam expanding system 6 and CCD image sensor 10 . The three-wavelength digital holographic imaging method based on the constrained underdetermined equation proposed by the present invention significantly improves the anti-noise performance of the traditional digital holographic technology. The present invention has simple and fast experimental operation, strong operability, and effectively integrates the Fresnel algorithm and the search algorithm for the unique solution of the underdetermined equation system, which expands the measurement range and reduces the influence of noise on the experiment and the recovery effect of the sample. .

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 method. The method is realized based on a search underdetermined equation system. Background technique [0002] The dual-wavelength digital holography technology has undergone many developments in recent years. It uses two beams of different wavelengths to synthesize an equivalent wavelength, which is greater than the maximum optical path difference generated 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 topography of the object is recovered through the relationship between the phase and the topography of the object, which has been widely used in biological cell detection and volume measurement of object surface topography. [0003] See (Optics express, 27(22)(2019); Optics and Lasers in Engineer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B9/021
CPCG01B9/02047
Inventor 李拓雷文秀董军张朵
Owner XIAN UNIV OF POSTS & TELECOMM
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