CN115112694A - Hand-held type back scattering image device - Google Patents
Hand-held type back scattering image device Download PDFInfo
- Publication number
- CN115112694A CN115112694A CN202210703669.1A CN202210703669A CN115112694A CN 115112694 A CN115112694 A CN 115112694A CN 202210703669 A CN202210703669 A CN 202210703669A CN 115112694 A CN115112694 A CN 115112694A
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- China
- Prior art keywords
- radiation generator
- chopper
- imaging device
- backscatter imaging
- transmission window
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000005855 radiation Effects 0.000 claims abstract description 53
- 238000003384 imaging method Methods 0.000 claims abstract description 47
- 230000005540 biological transmission Effects 0.000 claims description 22
- 238000000034 method Methods 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 12
- 230000004907 flux Effects 0.000 abstract description 8
- 239000000919 ceramic Substances 0.000 description 7
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000010894 electron beam technology Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000000333 X-ray scattering Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 239000002784 hot electron Substances 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
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- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
- G01N23/203—Measuring back scattering
-
- G01V5/222—
Abstract
The invention provides a handheld back scattering imaging device, which comprises a radiation generator and a chopper which are coaxially arranged, wherein the side surface of the radiation generator is provided with a collimating slit, and chopping holes which are arranged at equal intervals are arranged on the chopper with a circular ring structure, so that flying points formed in the scanning process are equal in size, the shape stability of an exposure point source in the exposure process of an object to be detected is ensured, and the image resolution quality of imaging is improved. In addition, because the angular velocity and the linear velocity of each area on the chopper are equal, the stay time of each flying spot on the surface of the object to be measured is also equal, namely the emergent flux of the rays is always equal, the stability of exposure signals is ensured, the problem of light and shade alternation of an imaging image caused by inconsistent emergent flux of the rays is avoided, and the quality of back scattering imaging is further improved.
Description
Technical Field
The invention relates to the technical field of radiation imaging examination, in particular to a handheld backscatter imaging device.
Background
The back scattering imaging technology is an imaging technology for obtaining a substance image in a certain depth on the surface of a detected target by detecting the intensity of X-ray scattering of different substances, and is suitable for imaging and checking organic substances such as explosives, drugs and the like. In the back scattering imaging technical solution, the pencil beam/flying spot scanning mode is the imaging mode with the lowest radiation leakage rate, specifically as shown in fig. 1, a collimator 2 is placed at the front end of a radiation source 1, and a narrow collimation slot is arranged on the collimatorSlit 3, collimator 2 collimates the cone beam ray or the wider fan beam into a thin fan beam S 1 The front end of the collimator is provided with a chopper 4, a plurality of chopping slits 5 are arranged on the chopper at equal angles, the chopper 4 is driven by a motor, and in the rotating process of the chopper 4, the chopping slits 5 and the collimating slits 3 are intersected to form periodic flying points from top to bottom or from left to right to scan an object 6 to be detected.
The prior art scheme such as the above can better realize back scattering imaging, but also has many defects, for example, the chopper always keeps the angular velocity equal in the rotating process of stable operation, but because the chopping slit has a certain length, the linear velocities at different positions of the chopping slit have relatively large difference, and the difference makes the exposure time of each detection point different during detection, thereby introducing the signal exposure strength difference; in addition, the chopping slits and the collimating slits intersect to form an overlapping region so as to form flying spots, and the shapes of the flying spots change along with the movement of the chopping flying disc, so that the shapes of the exposure point sources and the exposure regions are deformed or locally repeatedly exposed or lost in the exposure process of the detected target, and finally the image resolution quality of the back scattering imaging is influenced.
Disclosure of Invention
In view of the above disadvantages of the prior art, the present invention provides a handheld backscatter imaging device, which includes a radiation generator and a chopper that are coaxially disposed, wherein a collimating slit is disposed on a side surface of the radiation generator, and chopping holes are equidistantly arranged on the chopper in a circular ring structure, so that flying spots formed during a scanning process have the same size, thereby ensuring a stable shape of an exposure point source during an exposure process of an object to be measured, and improving an image resolution quality of an image. In addition, because the angular velocity and the linear velocity of each area on the chopper are equal, the time of each flying spot staying on the surface of the object to be measured is also equal, namely the emergent flux of rays is always equal, the stability of an exposure signal is ensured, the problem of light and shade alternation of an imaging image caused by inconsistent emergent flux of rays is avoided, and the quality of back scattering imaging is further improved.
To achieve the above and other related objects, the present invention provides a handheld backscatter imaging apparatus comprising:
the X-ray detector comprises a radiation generator, a light source and a light source, wherein the radiation generator is of a cylindrical structure, one side of the cylindrical structure is provided with a transmission window, and an X-ray beam generated by the radiation generator exits from the transmission window;
the chopper is in a circular ring structure and is coaxially arranged with the radiation generator, a plurality of chopping holes are arranged on the side surface of the chopper at equal intervals on the same circumference, and the plurality of chopping holes are aligned with the transmission window.
Optionally, the transmission window is formed as a collimating slit extending along a circumference of the cylindrical structure.
Optionally, the chopper is driven to rotate by the driving motor through a connecting piece.
Optionally, the shape of the chopping hole is circular, and the diameter of the chopping hole is between 0.2mm and 0.5 mm.
Optionally, the shape of the chopping hole is square, and the side length of the chopping hole is between 0.2mm and 0.5 mm.
Optionally, the width W of the collimating slit 1 Is between 0.3mm and 0.6 mm.
Optionally, the width W of the chopper 2 Is larger than the width W of the collimating slit 1 And W is 2 And W 1 The difference of (a) is between 3mm and 5 mm.
Optionally, the radiation generator comprises:
a housing;
the emission end is positioned on one side of the radiation generator, which is far away from the chopper;
the reflecting target is positioned on one side of the radiation generator close to the chopper;
the emission end and the reflection target are arranged in the shell and distributed along the axis of the radiation generator, the transmission window is arranged on the shell and aligned with the reflection target in the radial direction, and electrons generated by the emission end impact the reflection target to be reflected and then exit along the transmission window.
Optionally, an included angle α formed between the reflective target and the sidewall of the radiation generator is between 30 ° and 45 °.
Optionally, the radiation generator further includes a focusing electrode, which is located between the emission end and the reflective target, and is configured to focus and accelerate electrons generated by the emission end.
Optionally, the backscatter imaging apparatus further includes a high-voltage power supply circuit, located below the radiation generator, for providing power to the radiation generator.
The handheld backscatter imaging device provided by the invention at least has the following technical effects:
in the handheld back scattering imaging device provided by the invention, the radiation generator and the chopper are coaxially arranged, the side surface of the radiation generator is provided with the collimating slit, and the chopper with the circular ring structure is provided with the chopping holes which are equidistantly arranged, so that flying points formed in the scanning process are equal in size, the shape stability of an exposure point source in the exposure process of an object to be detected is ensured, and the imaging image resolution quality is improved. In addition, because the angular velocity and the linear velocity of each area on the chopper are equal, the stay time of each flying spot on the surface of the object to be measured is also equal, namely the emergent flux of the rays is always equal, the stability of exposure signals is ensured, the problem of light and shade alternation of an imaging image caused by inconsistent emergent flux of the rays is avoided, and the quality of back scattering imaging is further improved.
Drawings
Fig. 1 shows a schematic diagram of the operation of a prior art backscatter imaging device.
Fig. 2 is a schematic structural diagram of a handheld backscatter imaging device according to an embodiment.
Fig. 3 is a schematic cross-sectional view of a radiation generator according to an embodiment.
Fig. 4 is a schematic structural diagram of the radiation generator in the embodiment.
Fig. 5 is a schematic diagram of the handheld backscatter imaging device of this embodiment.
Description of the element reference
1 source of radiation 106 shield
2 collimator 107 insulating glue layer
3 collimating slit 108 ceramic tube
Heat dissipation structure of 4-chopper 109
5 chopped slit 110 transmission window support structure
6 object to be measured 111 chopper hole
10 radiation generator 1011 collimating slit
11 chopper 1021 hot cathode electrode
12 driving motor 1022 hot cathode filament
13 connector 1023 getter
14 high-voltage power supply circuit 1031 cathode focusing electrode
101 casing 1032 Anode focusing electrode
102 transmitting terminal A 1 Axis of radiation generator
103 focus electrode S 1 Thin fan beam
104 reflective target S 2 Fan-shaped X-ray beam
105 transmission window
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and although the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation, the form, quantity, position relationship and proportion of the components in actual implementation can be changed freely on the premise of implementing the technical solution of the present invention, and the layout form of the components may be more complicated.
Examples
The present embodiment provides a handheld backscatter imaging device, as shown in fig. 2, comprising a radiation generator 10 and a chopper 11.
As shown in fig. 3, the radiation generator 10 includes a housing 101, and an emission end 102, a focusing electrode 103, and a reflective target 104 disposed within the housing 101. By way of example, the housing 101 is a cylindrical structure with the emission end 102, focusing electrode 103 and reflective target 104 along the axis A of the radiation generator 10 1 And (4) distribution.
As shown in fig. 3, a shielding layer 106 is provided inside the housing 101 for shielding scattered X-rays. The shielding layer 106 is provided with an insulating glue layer 107 on the inner side thereof for preventing discharge or leakage between the electrodes and the ground. A ceramic tube 108 is disposed inside the insulating glue layer 107, and the emitter 102, the focusing electrode 103 and the reflective target 104 are welded to the ceramic tube 108, in this embodiment, the ceramic tube 108 is made of high-insulating Al 2 O 3 A ceramic tube. By way of example, the emitter 102, the focusing electrode 103 and the ceramic tube 108 are connected by vacuum brazing in a nested manner, so that the vacuum degree and the filament life in the working process of the ceramic tube are further maintained.
As an example, the emission end 102 is used for generating a hot electron beam, and as shown in fig. 3, the emission end 102 includes a hot cathode electrode 1021, a hot cathode filament 1022, and a getter 1023. In this embodiment, the hot cathode filament 1022 may be tungsten or rhodium filament, and the getter 1023 may be a titanium-based porous getter.
As shown in fig. 3, the focusing electrode 103 includes a cathode focusing electrode 1031 and an anode focusing electrode 1032, and the focusing electrode 103 is used for focusing the thermal electron beams generated by the emitting end 102 to improve the utilization rate of the thermal electrons, reduce the size of the focal point of the tube, and improve the subsequent imaging quality. In the present embodiment, the materials of the cathode focusing electrode 1031 and the anode focusing electrode 1032 can be selected from 4J33 alloy or 4J34 alloy.
As shown in fig. 3, a reflective target 104 is disposed on a side of the casing 101 opposite to the emission end 102, an included angle α between the reflective target 104 and a side wall of the radiation generator 10 is between 30 ° and 45 °, and the thermal electron beam impinges on the reflective target 104 to generate an X-ray beam. As an example, the material of the reflective target 104 may be tungsten, gold, or the like, and the reflective target 104 may be deposited on the heat dissipation structure 109 by magnetron sputtering, in this embodiment, the heat dissipation structure 109 is made of an oxygen-free copper material with good heat dissipation.
As shown in fig. 3, one side of the housing 101 has a transmission window 105, and the transmission window 105 is aligned with the reflective target 104 in the radial direction, so that the X-ray beam is reflected by the reflective target 104 and then exits along the transmission window 105. In this embodiment, the transmission window 105 is welded to the transmission window support structure 110, and the transmission window 105 is preferably a beryllium window. Referring to fig. 4 and 5, the transmission window 105 is formed as a collimator slit 1011 extending in the circumferential direction of the radiation generator 10, and the X-ray beam passes through the collimator slit 1011 and is limited to a sheet-like fan-shaped X-ray beam S 2 In the present embodiment, the width W of the collimator slit 1011 1 Is between 0.3mm and 0.6 mm.
As shown in fig. 2, the chopper 11 is located at one end of the radiation generator 10 where the transmission window 105 is located, and the chopper 11 is of a circular ring-shaped structure and is disposed coaxially with the radiation generator 10. By way of example, the width W of the chopper 11 2 Is larger than the width W of the collimating slit 1011 in the radiation generator housing 1 And W is 2 And W 1 The difference value of (A) is 3 mm-5 mm, and the scattered X-ray beams can be effectively shielded to reduce the leakage rate of the rays. Preferably, the chopper 11 is made of tungsten material.
As shown in fig. 2 and 5, the side of the chopper 11The surface has multiple chopping holes 111 arranged at equal intervals on the same circumference, and the multiple chopping holes 111 are aligned with the collimating slits 1011 on the radiation generator shell to make the fan-shaped X-ray beam S 2 Can be transmitted through the chopper hole 111 to the detector 12. As an example, the shape of the chopping hole 111 is circular, and the diameter of the chopping hole 111 is between 0.2mm and 0.5 mm; in another alternative embodiment, the shape of the chopping hole 111 is square, and the side length of the chopping hole 111 is between 0.2mm and 0.5 mm.
As shown in fig. 2, the chopper 11 can be rotated about its own axis by the drive motor 12, and the chopper 11 is connected to the drive motor 12 through a connecting member 13. As an example, the driving motor 12 may be a high-speed electric cylinder, and the operating speed of the driving motor 12 may be selected according to the requirements of the actual application scenario, as long as the generated flying spot can meet the scanning accuracy of the two-dimensional plane of the object to be measured. As an example, the connecting member 13 is preferably made of hard aluminum to further reduce the weight of the backscatter imaging apparatus.
As shown in fig. 2, a high-voltage power supply circuit 14 is provided below the radiation generator 10, and the high-voltage power supply circuit 14 includes a filament power supply circuit and a dc dedicated power supply circuit (not shown in the figure) for supplying current to the radiation generator 10. In the present embodiment, the output voltage of the high voltage power circuit 14 is not lower than 120kV to meet the requirement that the detection depth of the backscatter imaging device is not lower than 3mm, and the high voltage power circuit 14 preferably adopts a bipolar power supply mode.
The working principle of the handheld backscatter imaging device provided by the embodiment is as follows:
as shown in FIG. 5, the radiation source 1 in the radiation generator 10 generates a fan-shaped X-ray beam S in which the X-ray beam passes through the collimator slit 1011 and is limited to a sheet shape 2 The chopper 11 is driven by the driving motor 13 to rotate, and the chopping hole 111 on the chopper is overlapped with the collimating slit 1011 at the moment, and the overlapped area allows the fan-shaped X-ray beam S 2 When any one of the chopper holes 111 moves, it will produce an overlapping region with the collimating slit 1011 to form a continuous flying spot, thereby completing the treatmentScanning of the object 6 is measured. When the flying spot is projected on the surface of the measured object, compton backscattering is generated between the flying spot and electrons in the measured object, scattered photons are received by a detector (not shown in the figure) and are converted into voltage signals through photoelectricity, the amplitude of the corresponding voltage signals is used as the brightness/gray value of an image, and an X-ray backscattering image is finally reconstructed, so that the imaging detection of the measured object is completed.
In the handheld back scattering imaging device provided by the invention, the radiation generator and the chopper are coaxially arranged, the side surface of the radiation generator is provided with the collimating slit, and the chopper with the circular ring structure is provided with the chopping holes which are equidistantly arranged, so that flying points formed in the scanning process are equal in size, the shape stability of an exposure point source in the exposure process of an object to be detected is ensured, and the imaging image resolution quality is improved. In addition, because the angular velocity and the linear velocity of each area on the chopper are equal, the time of each flying spot staying on the surface of the object to be measured is also equal, namely the emergent flux of rays is always equal, the stability of an exposure signal is ensured, the problem of light and shade alternation of an imaging image caused by inconsistent emergent flux of rays is avoided, and the quality of back scattering imaging is further improved.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (11)
1. A handheld backscatter imaging device, comprising:
the X-ray detector comprises a radiation generator, a light source and a light source, wherein the radiation generator is of a cylindrical structure, one side of the cylindrical structure is provided with a transmission window, and an X-ray beam generated by the radiation generator exits from the transmission window;
the chopper is in a circular ring structure and is coaxially arranged with the radiation generator, a plurality of chopping holes are arranged on the side surface of the chopper at equal intervals on the same circumference, and the plurality of chopping holes are aligned with the transmission window.
2. The handheld backscatter imaging device of claim 1 wherein the transmission window is formed as a collimating slit extending along a circumference of the cylindrical structure.
3. The handheld backscatter imaging device of claim 1 further comprising a drive motor that rotates the chopper via a linkage.
4. The handheld backscatter imaging device of claim 1 wherein the chopping aperture is circular in shape and the diameter of the chopping aperture is between 0.2mm and 0.5 mm.
5. The handheld backscatter imaging device of claim 1 wherein the shape of the chopping aperture is square and the side length of the chopping aperture is between 0.2mm and 0.5 mm.
6. The handheld backscatter imaging device of claim 2 wherein the width W of the collimating slit 1 Is between 0.3mm and 0.6 mm.
7. The handheld backscatter imaging device of claim 6 wherein the width W of the chopper 2 Is larger than the width W of the collimation slit 1 And W is 2 And W 1 The difference of (a) is between 3mm and 5 mm.
8. The handheld backscatter imaging device of claim 1, wherein the radiation generator comprises:
a housing;
the emitting end is positioned on one side of the radiation generator away from the chopper;
the reflecting target is positioned on one side of the radiation generator close to the chopper;
the emission end and the reflection target are arranged in the shell and distributed along the axis of the radiation generator, the transmission window is arranged on the shell and aligned with the reflection target in the radial direction, and electrons generated by the emission end impact the reflection target to be reflected and then exit along the transmission window.
9. The handheld backscatter imaging device of claim 8 wherein the angle α subtended by the reflective target and the sidewall of the radiation generator is between 30 ° and 45 °.
10. The handheld backscatter imaging device of claim 8 wherein the radiation generator further comprises a focusing electrode positioned between the emission end and the reflective target for focusing and accelerating electrons generated by the emission end.
11. The handheld backscatter imaging device of claim 8 further comprising a high voltage power supply circuit located below the radiation generator for providing power to the radiation generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210703669.1A CN115112694A (en) | 2022-06-21 | 2022-06-21 | Hand-held type back scattering image device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210703669.1A CN115112694A (en) | 2022-06-21 | 2022-06-21 | Hand-held type back scattering image device |
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| Publication Number | Publication Date |
|---|---|
| CN115112694A true CN115112694A (en) | 2022-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210703669.1A Pending CN115112694A (en) | 2022-06-21 | 2022-06-21 | Hand-held type back scattering image device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024011247A3 (en) * | 2022-07-07 | 2024-02-15 | Viken Detection Corporation | Rotating hoop chopper wheel for x-ray imagers |
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2022
- 2022-06-21 CN CN202210703669.1A patent/CN115112694A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024011247A3 (en) * | 2022-07-07 | 2024-02-15 | Viken Detection Corporation | Rotating hoop chopper wheel for x-ray imagers |
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