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TR-MUSIC algorithm-based optical scanning holographic axial positioning method

An optical scanning and axial positioning technology, which is applied in the direction of the instrument, can solve the problem of low resolution of the scanning axial distance

Inactive Publication Date: 2017-09-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: to provide an optical scanning holographic axial positioning method based on the TR-MUSIC algorithm, and to solve the problem of low resolution of the scanning axial distance in the prior art optical scanning holographic technology

Method used

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  • TR-MUSIC algorithm-based optical scanning holographic axial positioning method
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  • TR-MUSIC algorithm-based optical scanning holographic axial positioning method

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Embodiment 1

[0089] The present invention uses the TR-MUSIC algorithm to realize the axial super-resolution positioning of the object, which has ultra-high precision and resolution, and is now explained through the following simulation research:

[0090] Simulation 1, z 1 = 34mm, z 2 = 34.4 mm, z 1 and z 2 When a detection target is placed at (10, 5), such as Figure 3a shown.

[0091] Simulation 2, z 1 = 34mm, z 2 = 34.04mm, z 1 and z 2 When a detection target is placed at (10, 5), such as Figure 3b shown.

[0092] Simulation 3, z 1 = 100 μm, z 2 = 100.004 μm, z 1 and z 2 When a detection target is placed at (10, 5), such as Figure 3c shown.

[0093] According to a and b in Figure 3, it can be seen that for an object with an axial distance of 34mm, its resolution can reach 0.4mm, while from Figure 3c It can be seen that the resolution of an object with an axial distance of 100 μm can reach 0.004 μm. Therefore, the method is considered to have high resolution.

[0094]...

Embodiment 2

[0148] The invention uses the TR-MUSIC algorithm to realize the axial super-resolution positioning of the object, is less affected by noise, and has a wide application range. This is illustrated by the following simulation studies:

[0149] Simulation 4, z 1 = 100 μm, z 2 = 100.008 μm, z 1 and z 2 When a detection target is placed at (10, 5) and 60dB Gaussian white noise is added, such as Figure 4 As shown, it can be seen that the present invention is less affected by noise.

[0150] The implementation steps of this simulation study are the same as those of the simulation study in Embodiment 1, and will not be repeated here.

Embodiment 3

[0152] The present invention uses the TR-MUSIC algorithm to realize axial super-resolution positioning of an object, and can effectively perform super-resolution axial positioning on multiple points in a single layer. Specifically, the simulation is described as follows:

[0153] Simulation 5, z 1 = Place 4 points at 100μm, z 2 = When 4 points are placed at 101μm, such as Figure 5a shown.

[0154] Simulation 6, z 1 = Place 4 points at 100μm, z 2 = When placing 3 points at 101μm, such as Figure 5b shown.

[0155] Simulation 7, z 1 = Place 4 points at 100μm, z 2 = When 2 points are placed at 101μm, such as Figure 5c shown.

[0156] According to the above simulation, it can be seen that the present invention is still applicable to multi-point objects, and the resolution can reach 1 μm.

[0157] The implementation steps of this simulation study are the same as those of the simulation study in Embodiment 1, and will not be repeated here.

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Abstract

The invention discloses a TR-MUSIC algorithm-based optical scanning holographic axial positioning method, and solves the problem of low scanning axial distance resolution of the optical scanning holographic technology in the prior art. The optical scanning holographic axial positioning method comprises the following steps of forming a Fresnel zone plate by concentrated interference after laser beam splitting; then scanning an object by the Fresnel zone plate to obtain a hologram of the object, and performing fourier transform on the hologram to obtain a matrix K; next, obtaining a time reversal matrix corresponding to a multilayered slice of the object through the matrix K and then solving a characteristic value and a characteristic vector so as to decompose the hologram into a signal sub space and a noise sub space; and finally performing equal-spacing discretization on the single-layer slice of the object by a finite element method and taking each unit as test targets to solve the hologram, and then obtaining imaging pseudo spectrum of all single-layer object slices, and performing summation on the imaging pseudo spectrum to represent the parameter of the axial position of the object. The optical scanning holographic axial positioning method is simple in realization way, convenient to operate and is quite high in practicability.

Description

technical field [0001] The invention relates to the field of optical scanning holographic technology and spatial positioning, in particular to an optical scanning holographic axial positioning method based on the TR-MUSIC algorithm. Background technique [0002] Optical scanning holography, referred to as OSH, is an important branch of digital holography. It uses optical scanning technology to store the 3D information slice of the object as 2D information, so as to obtain the hologram of the object. This technology was proposed by Poon and Korpel in 1979 when they were studying the acousto-optic heterodyne image processor. Since the technology was proposed, it has been widely used in the fields of scanning holographic microscope, 3D image recognition and 3D optical remote sensing. [0003] In the field of optical scanning holography technology, since the reconstruction process of hologram needs to use the distance from the scanning mirror to the object, obtaining accurate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/22
CPCG03H1/2249
Inventor 欧海燕吴勇邵维王秉中
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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