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Terahertz tomography system based on three-dimensional Radon transformation and imaging method and operation method thereof

A tomography, terahertz technology, applied in the field of terahertz imaging, can solve the problems of complex structure, high system cost, many devices, etc., and achieve the effect of high imaging resolution, high imaging stability, and reduced imaging time.

Pending Publication Date: 2021-02-12
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing imaging system has many components and complex structure, and the cost of building the system is relatively high

Method used

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  • Terahertz tomography system based on three-dimensional Radon transformation and imaging method and operation method thereof

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Effect test

Embodiment 1

[0039] Such as figure 1 As shown, the present invention discloses a terahertz tomography system based on three-dimensional Radon transform, including a terahertz emission source 1, a sample stage 10, a beam conversion unit, and a terahertz detection array 4 arranged along the transmission direction of the terahertz beam optical path , support frame 8, lifting frame, sample table 10 is arranged on the support frame 8 by vertical axis rotation stepper motor 9; Beam conversion unit includes first diffractive optical element 2 and second diffractive optical element 3; A stepper motor 6, the output shaft of the lifting stepper motor 6 is connected with a horizontal axis rotation stepper motor 7, the output shaft of the horizontal rotation stepper motor is connected with a U-shaped frame 5, and the terahertz emission source 1 is fixed on the U-shaped frame 5 on the left side, the beam conversion unit and the terahertz detection array 4 are fixed on the right side of the U-shaped fr...

Embodiment 2

[0046] An imaging method of the above-mentioned terahertz tomography system based on three-dimensional Radon transform, comprising the following steps:

[0047] S1. The terahertz beam emitted by the terahertz emission source is incident on the sample on the sample stage;

[0048] S2. The transmitted beam passing through the sample is converged into a fan-shaped beam by the beam conversion unit;

[0049] S3. The terahertz detection array detects the light intensity information of the fan beam, and converts the light intensity information into a photocurrent signal;

[0050] S4. The data acquisition card converts the photocurrent signal into a voltage signal;

[0051] S5, the data acquisition card obtains the sample in the Angular Projection Data ;

[0052] S6. Control the sample to rotate around the vertical direction by rotating the stepper motor on the vertical axis, and repeat steps S1-S5 to obtain the projection data of the sample in a certain section ;

[0053] S...

Embodiment 3

[0057] The operation method of the above-mentioned three-dimensional Radon transform-based terahertz tomography system includes the following steps:

[0058] A1. Parameter setting: set the lifting stepper motor, horizontal axis rotation stepper motor, and vertical axis rotation stepper motor at zero position, fix the sample on the sample stage, and set the level on the control module according to the imaging accuracy required by the user. The initial position of the axis rotation stepper motor, the rotation range of the vertical axis rotation stepper motor is set to 360°, and the rotation step size of the horizontal axis rotation stepper motor and the vertical axis rotation stepper motor are set at the same time;

[0059] A2, motor reset: the control module 13 controls the lifting stepper motor, the horizontal axis rotation stepper motor, and the vertical axis rotation stepper motor to move to the initial position through the stepper motor controller 12;

[0060] A3. Initial r...

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Abstract

The invention discloses a terahertz tomography system based on three-dimensional Radon transformation and an imaging method and an operation method thereof. The imaging system comprises a terahertz emission source, a sample table, a beam conversion unit, a terahertz detection array, a support frame and a lifting frame which are arranged along the transmission direction of a terahertz beam opticalpath. The sample table is arranged on the support frame through a vertical shaft rotating stepping motor; the beam conversion unit comprises a first diffractive optical element and a second diffractive optical element; and a lifting stepping motor is arranged on the lifting frame, an output shaft of the lifting stepping motor is connected with a horizontal shaft rotating stepping motor, and an output shaft of the horizontal shaft rotating stepping motor is connected with a U-shaped frame. The terahertz tomography system based on three-dimensional Radon transformation and the imaging method andthe operation method thereof have the advantages of being good in imaging stability, short in imaging time, high in imaging resolution and large in imaging depth of field.

Description

technical field [0001] The present invention relates to the technical field of terahertz imaging, and specifically refers to a three-dimensional Radon transform-based terahertz tomographic imaging system, an imaging method, and an operation method thereof. Background technique [0002] Terahertz (THz) waves are between microwaves and infrared waves in the electromagnetic spectrum, and have the characteristics of both microwaves and infrared waves. Terahertz waves can penetrate most dielectric materials (such as: paper, wood, knitted fabrics, etc.) and non-polar liquids. X-rays, infrared waves and microwaves in the electromagnetic spectrum are widely used in various imaging systems. For the same material, the penetration ability of terahertz waves is better than that of infrared waves; when the imaging principle is the same, the resolution of terahertz imaging higher than that of microwaves. Terahertz waves have extremely low photon energy, will not cause harmful ionization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3581
CPCG01N21/3581
Inventor 李昌勇牛丽婷刘智城何颖君李天乐朱伟玲
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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