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Method for three-dimensional imaging based on terahertz chromatography of planar array type detector

A three-dimensional imaging and terahertz technology, applied in the field of image processing, can solve problems such as long acquisition time and high requirements on the stability of imaging samples

Active Publication Date: 2016-04-27
BEIJING UNIV OF TECH
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Problems solved by technology

[0003] At present, most terahertz tomography is still based on the point scanning tomography method, which requires a long acquisition time during the data acquisition process, and has high requirements for the stability of the imaging sample

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  • Method for three-dimensional imaging based on terahertz chromatography of planar array type detector
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  • Method for three-dimensional imaging based on terahertz chromatography of planar array type detector

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Embodiment Construction

[0020] Typical embodiments and features of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] A method for three-dimensional imaging based on area array detector terahertz tomography of the present invention is characterized in that its system includes CO 2 Pumping terahertz laser 1, first gold-plated parabolic mirror 2, second gold-plated parabolic mirror 3, sample to be tested 4, precision electric rotary table 5, pyroelectric image detector 6, such as figure 2 shown. CO 2 The pumping terahertz laser 1 is used to output continuous terahertz waves with a center frequency of 2.52 THz (corresponding to a center wavelength of 118.83 μm), and the actual power is 70 mW. The number of pixels of the pyroelectric image detector 6 is 320×320 pixels, the pixel size is 80 μm×80 μm, and the sampling frequency is 48 Hz.

[0022] The distance d from the back section of the sample to the detector plate is about 8.5 cm. The samp...

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Abstract

The invention relates to a system and a method for three-dimensional imaging based on terahertz chromatography of a planar array type detector. According to the method disclosed by the invention, a first gold-plated paraboloid mirror and a second gold-plated paraboloid mirror are arranged in a mutually corresponding manner to form a beam expanded unit, wherein the beam expanded unit is arranged between a CO2 pumping terahertz laser and a sample to be detected and can be used for enlarging a terahertz spot output by the CO2 pumping terahertz laser by twice and enabling the propagation directions of output light to be parallel. The sample to be tested is placed between the second gold-plated paraboloid mirror and a pyroelectric image detector; a numerical value of projection transmitting the sample to be detected is collected by the pyroelectric image detector and is called as a projection drawing I (x, y). According to the system and the method disclosed by the invention, a diffraction effect of terahertz waves is introduced to the planar array type detector, processed data is propagated to the back surface of the sample by using an angular spectrum diffraction and propagation theory, and then filtered and reestablished with a filter back-projection algorithm in order to restrain the diffraction effect of terahertz waves, and finally three dimensional structure imaging inside the sample is obtained.

Description

technical field [0001] The invention belongs to the technical field of image processing, and relates to a three-dimensional tomographic imaging method based on an area array detector, in particular to a three-dimensional imaging method based on a terahertz tomographic imaging of an area array detector. Background technique [0002] Generally, electromagnetic waves with a frequency of 0.1THz-10THz (wavelength 3mm-0.03mm) are called terahertz waves. Terahertz waves are located between microwaves and infrared waves, and are penetrable to non-metallic and non-polar substances, such as plastics, wood, clothes, etc., and have low ionization compared to X-rays, and will not be destroyed by photoionization The substance to be tested is more suitable for "living detection". Due to the inherent characteristics of terahertz waves, terahertz wave imaging technology has become one of the research hotspots. Computer tomography technology: use a beam of rays to scan a certain section of ...

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Application Information

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IPC IPC(8): G01N23/04G06T15/00
CPCG01N23/04G06T15/00
Inventor 王大勇李斌戎路王云新万敏黄昊翀
Owner BEIJING UNIV OF TECH
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