Detection device based on energy dispersion X-ray diffraction

A detection device and energy dispersion technology, applied in the field of X-ray security inspection, can solve the problems of obtaining practical applications, the overall huge system, and the inability of diffraction technology, and achieve the effects of simple structure, high detection efficiency, and increased detection range.

Active Publication Date: 2019-09-20
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is very difficult to manufacture large-area pixel type high-purity germanium detectors 10, which can be developed by only a few foreign companies (U.S. Ortec Corporation, Canberra Corporation), and the price is extremely expensive (several million yuan).
In addition, the high-purity germanium detector 10 needs to be used at low temperature and must be equipped with a liquid nitrogen cooling system, resulting in a very large system as a whole
The above two points determine that the diffraction technology of the ring array method cannot be practically applied in the future

Method used

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  • Detection device based on energy dispersion X-ray diffraction
  • Detection device based on energy dispersion X-ray diffraction
  • Detection device based on energy dispersion X-ray diffraction

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Embodiment 1

[0044] A novel helical energy dispersive X-ray diffraction optical structure and system, such as figure 1 and Figure 4 As shown, the incident beam 2 of this optical structure is a collimated thin beam X-ray, the axis of the incident beam 2 is the main optical axis, and the included angle between the diffracted beam 3 and the main optical axis is fixed at θ=5°, which satisfies the Bragg law. like figure 2 The shown X-ray diffraction beam 3 is collected by an energy spectrum detector 5 , and the diffraction beam 3 defined by each energy spectrum detector 5 and its corresponding Sola slit 4 constitutes a diffraction detection unit 6 . like image 3 The five diffraction detection units 6 that are spirally distributed around the main optical axis and the incident light beam 2 constitute the optical structure of the spiral energy dispersive X-ray diffraction. The angle distribution of the diffraction detection units 6 is uniform, and the angle between them is 72 °. The detec...

Embodiment 2

[0049] A detection device based on energy dispersive X-ray diffraction, comprising an X-ray emission module, a displacement mechanism 12, a diffraction detection module, and a controller 7, and the controller 7 is electrically connected to the X-ray emission module, the displacement mechanism 12, and the diffraction detection module;

[0050] The controller 7 is used to control the work and signal collection of each component of the system, and perform algorithmic recognition on the collected diffraction signals to realize the detection of substances.

[0051] The X-ray emitting module emits an incident light beam 2, which passes through different thicknesses of the object to be measured 8 arranged on the displacement mechanism 12 to generate a plurality of diffracted beams 3, and the diffraction detection module includes a plurality of diffraction detection units 6, each diffraction detection unit 6 is arranged on the optical path of the corresponding diffracted beam 3 .

[0...

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Abstract

The invention relates to a detection device based on energy dispersion X-ray diffraction. The detection device based on energy dispersion X-ray diffraction comprises an X-ray emission module, a displacement mechanism, a diffraction detection module and a controller, wherein the controller is electrically connected with the X-ray emission module, the displacement mechanism and the diffraction detection module and is used for controlling the work of each component and the acquisition of signals; the X-ray emission module emits incident beams, the incident beams penetrate different thicknesses of an object to be detected on the displacement mechanism to generate a plurality of diffracted beams, the diffraction detection module comprises a plurality of diffraction detection units, and each diffraction detection unit is arranged on a light path of the corresponding diffracted beam. Compared with the prior art, the X-ray diffraction technology is adopted, the drugs, explosives and other substances can be accurately identified, the detection range in the thickness direction of the object is enlarged, the detection time is shortened, the detection efficiency is improved, the device is low in cost and can be used at normal temperature, the whole system is small in size, and the detection device has important application prospects in the aspect of detection of contraband in the security inspection field.

Description

technical field [0001] The invention belongs to the technical field of X-ray security inspection, and relates to a detection device based on energy dispersive X-ray diffraction. Background technique [0002] At present, important security inspection places, such as airports, logistics and railway stations, mainly use X-ray perspective imaging technology to check for contraband. Security personnel make judgments based on the shape and brightness information of the perspective images of packages or luggage to be tested. X-ray fluoroscopy imaging technology can obtain the effective atomic number and density information of substances, and it has a good detection effect on metal substances with high atomic number, but it has a poor detection effect on substances with low atomic number such as daily organic matter, drugs and plastic explosives, and It is impossible to effectively distinguish daily organic matter, drugs, and explosives, so the accuracy of the detection of such cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V5/00G01N23/207G01N23/2273
CPCG01N23/207G01N23/2273G01V5/0008
Inventor 穆宝忠陈异凡王新
Owner TONGJI UNIV
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