CN212695118U - Variable focus cold cathode X-ray tube - Google Patents
Variable focus cold cathode X-ray tube Download PDFInfo
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- CN212695118U CN212695118U CN202021961520.6U CN202021961520U CN212695118U CN 212695118 U CN212695118 U CN 212695118U CN 202021961520 U CN202021961520 U CN 202021961520U CN 212695118 U CN212695118 U CN 212695118U
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- 230000005684 electric field Effects 0.000 claims description 52
- 239000000919 ceramic Substances 0.000 claims description 11
- 230000001133 acceleration Effects 0.000 claims description 5
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- 230000005855 radiation Effects 0.000 abstract description 8
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000007246 mechanism Effects 0.000 abstract description 3
- 238000010894 electron beam technology Methods 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
A variable focus cold cathode X-ray tube belongs to the technical field of X-ray tubes and comprises: the electron collecting assembly is arranged on the electron collecting assembly, and the electron collecting assembly is arranged on the electron collecting assembly. The variable focus cold cathode X-ray tube provided by the application can directly emit electrons at room temperature based on field emission without consuming time and power to heat the cathode, so that the variable focus cold cathode X-ray tube has the advantages of quick start and low power consumption; meanwhile, cold cathode field emission also has the characteristics of instant on and off, so that the device has the advantages of high time resolution, controllable emission, small ineffective radiation dose and the like, and the active focusing mechanism realizes flexible adjustment of the size of a focal spot so as to meet different detection requirements.
Description
Technical Field
The utility model belongs to the technical field of X ray detects, concretely relates to cold cathode X-ray tube can zoom.
Background
The conventional hot cathode X-ray tube uses a filament as a cathode, and the filament needs to be heated to a higher temperature to emit a large amount of electrons, so that the hot cathode X-ray tube has the problems of slow start, low time resolution, large ineffective radiation dose, high working temperature and the like, and the development of a variable focus cold cathode X-ray tube is imperative.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, the present invention provides a variable focus cold cathode X-ray tube, comprising:
a tube body for mounting the components; the tube body having opposite first and second ends;
an electron generation assembly for generating electrons; the electron generation assembly is arranged at the first end of the tube body of the ray tube;
an electron collecting member for collecting the electrons generated by the electron generating member; the electron collecting assembly is arranged at the first end of the tube body of the ray tube and is adjacent to the electron generating assembly;
the electric field generating anode assembly is used for generating an electric field in the tube body of the ray tube together with the electric field generating cathode assembly; the electric field generating anode assembly is arranged at the second end of the tube body of the ray tube;
the electric field generating cathode assembly is used for generating an electric field in the tube body of the ray tube together with the electric field generating anode assembly; the electric field generating cathode assembly is arranged at the first end of the tube body of the ray tube and is adjacent to the electron generating assembly;
the ray window is used for receiving X rays obtained by bombarding the electric field generation anode assembly by the electrons collected by the electron collection assembly under the acceleration action of the electric field; the ray window is arranged on the side wall of the tube body of the ray tube.
Preferably, the electron generation assembly comprises: the cathode power supply is connected with the cathode.
Preferably, the electron collecting assembly comprises: the electron source comprises a focusing electrode and a focusing electrode power supply, wherein the focusing electrode is arranged at the first end of the tube body of the ray tube and is positioned at an electron emitting end of the electron generating assembly, and the focusing electrode power supply is connected with the focusing electrode.
Preferably, the electric field generating anode assembly comprises: the anode is arranged at the second end of the tube body of the ray tube, and the anode is connected with the anode power supply.
Preferably, the electric field generating anode assembly further comprises: the ceramic chip is arranged at the second end of the tube body of the ray tube, and the anode is arranged on the ceramic chip.
Preferably, the electric field generating anode assembly further comprises: and the radiator is arranged on the ceramic chip and is connected with the anode.
Preferably, the electric field generating cathode assembly includes: and the grid is arranged at the first end of the tube body of the ray tube, is positioned between the cathode in the electron generation assembly and the gathering pole in the electron gathering assembly, and is connected with the gathering pole through an insulating supporting block.
Preferably, a getter is arranged inside the tube body.
Preferably, an exhaust pipe is arranged on the tube body.
The variable focus cold cathode X-ray tube provided by the application can directly emit electrons at room temperature based on field emission without consuming time and power to heat the cathode, so that the variable focus cold cathode X-ray tube has the advantages of quick start and low power consumption; meanwhile, cold cathode field emission also has the characteristics of instant on and off, so that the device has the advantages of high time resolution, controllable emission, small ineffective radiation dose and the like, and the active focusing mechanism realizes flexible adjustment of the size of a focal spot so as to meet different detection requirements.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a variable focus cold cathode X-ray tube according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
In an embodiment of the present application, as shown in fig. 1, the present invention provides a variable focus cold cathode X-ray tube, comprising: the tube body 3, the electron generating assembly, the electron collecting assembly, the electric field generating anode assembly, the electric field generating cathode assembly and the radiation window 11, each of which will be described in detail below.
Referring to fig. 1, in an embodiment of the present application, the present invention provides a variable focus cold cathode X-ray tube including:
a tube body 3 for mounting various parts; said tube body 3 having opposite first and second ends;
an electron generation assembly for generating electrons; the electron generating assembly is arranged at a first end of the tube body 3;
an electron collecting member for collecting the electrons generated by the electron generating member; the electron collecting assembly is arranged at the first end of the tube body 3 of the ray tube and is adjacent to the electron generating assembly;
an electric field generating anode assembly for generating an electric field with the electric field generating cathode assembly within the tube body 3; the electric field generating anode assembly is arranged at the second end of the tube body 3 of the ray tube;
an electric field generating cathode assembly for generating an electric field with said electric field generating anode assembly within said tube body 3; the electric field generating cathode assembly is arranged at the first end of the tube body 3 of the ray tube and is adjacent to the electron generating assembly;
the ray window 11 is used for receiving X rays obtained by bombarding the electric field generation anode assembly by the electrons collected by the electron collection assembly under the acceleration action of the electric field; the radiation window 11 is arranged on the side wall of the tube body 3.
When the variable focus cold cathode X-ray tube is used, electrons are generated at the first end of the tube body 3 of the tube through the electron generating assembly, and then the electrons generated by the electron generating assembly are gathered by the electron gathering assembly to form an electron beam with a preset diameter; meanwhile, the electric field generating anode assembly and the electric field generating cathode assembly are matched with each other to generate an electric field with preset strength, the electron beam obtained by gathering the electron gathering assembly moves from the first end of the tube body 3 of the ray tube to the second end of the tube body 3 of the ray tube under the acceleration action of the electric field so as to bombard the electric field generating anode assembly to obtain X rays, and the X rays are sent to the ray window 11.
As shown in fig. 1, in the embodiment of the present application, the electron generation assembly includes: a cathode power supply 7 and a cathode 9, wherein the cathode 9 is arranged at a first end of the tube body 3, and the cathode power supply 7 is connected to the cathode 9.
As shown in fig. 1, in the embodiment of the present application, the electron collecting assembly includes: a focusing electrode 4 and a focusing electrode power supply 6, wherein the focusing electrode 4 is disposed at a first end of the tube body 3 and is located at an electron emitting end of the electron generating assembly, and the focusing electrode power supply 6 is connected to the focusing electrode 4.
In the present embodiment, the cathode power supply 7 supplies power to the cathode 9, the focus electrode power supply 6 supplies power to the focus electrode 4, and when the cathode 9 is energized, the cathode 9 can generate electrons at the first end of the tube body 3, and the electrons move through the focus electrode 4 toward the second end of the tube body 3. When the focusing electrode 4 is energized, the focusing electrode 4 can focus electrons generated from the cathode 9 to obtain an electron beam with a predetermined diameter. The cathode 9 is realized by depositing a layer of carbon nanotubes on a metal block.
As shown in fig. 1, in the embodiment of the present application, the electric field generating anode assembly includes: an anode 1 and an anode power supply 13, wherein the anode 1 is disposed at a second end of the tube body 3, and the anode 1 is connected to the anode power supply 13.
In the embodiment of the present application, as shown in fig. 1, the electric field generating cathode assembly includes: and the grid electrode 10 is arranged at the first end of the tube body 3 of the ray tube, is positioned between the cathode 9 in the electron generating assembly and the gathering electrode 4 in the electron gathering assembly, and is connected with the gathering electrode 4 through an insulating supporting block.
In the embodiment of the present application, the anode power source 13 supplies power to the anode 1, and after the anode 1 is powered, the anode 1 and the grid 10 together generate an electric field with a predetermined intensity inside the tube body 3 of the tube, and the electric field intensity can be adjusted according to the voltage of the anode power source 13. The grid 10 is a strip grid, electrons generated by the cathode 9 firstly pass through the strip grid of the grid 10 and then are gathered by the gathering electrode 4 to obtain an electron beam, then the electron beam moves towards the anode 1 under the acceleration action of an electric field, and bombards an anode target on the anode 1 to generate X rays, and the X rays are sent to the ray window 11. The anode target surface of the anode 1 is a tungsten plate, is inclined towards the ray window 11, and has an inclination angle of 15 degrees.
As shown in fig. 1, in the embodiment of the present application, the electric field generating anode assembly further includes: the ceramic chip 2, the ceramic chip 2 set up in the second end of the tube body 3 of the ray tube, positive pole 1 set up in on the ceramic chip 2. The ceramic plate 2 can stabilize and support the anode 1.
As shown in fig. 1, in the embodiment of the present application, the electric field generating anode assembly further includes: and the radiator 12 is arranged on the ceramic plate 2, and is connected with the anode 1. When the anode 1 is operated, a large amount of heat is generated, and the heat sink 12 can dissipate the heat.
As shown in fig. 1, in the embodiment of the present application, the tube body 3 is provided with an exhaust duct 8.
In the present embodiment, the inside of the tube body 3 needs to be maintained at an ultra-high vacuum. Specifically, an air extraction device can be connected to the exhaust pipe 8, then the exhaust device is opened, the air in the tube body 3 of the tube is extracted through the exhaust pipe 8, the required ultrahigh vacuum is achieved in the tube body 3 of the tube, and then the exhaust pipe 8 is cut off in a cold pressing mode, so that the tube body 3 of the tube is kept in a vacuum sealing mode.
In the present embodiment, as shown in fig. 1, the tube body 3 is internally provided with a getter 5. The getter 5 is able to react with the gas inside the tube body 3, maintaining the inside of the tube body 3 at an ultra-high vacuum.
In the embodiment of the present application, the tube body 3 is made of stainless steel, which has good mechanical strength and ultra-high vacuum applicability, and also has non-magnetic and easy precision machining and welding properties. The radiation window 11 is an aluminum window, and is provided on the outer surface of the tube body 3 of the tube, and the thickness of the aluminum layer is 2.2mm at the radiation exit position. The central lines of the anode 1, the focusing electrode 4, the cathode 9 and the grid 10 are in a straight line, and the plane of the ray window 11 is perpendicular to the central lines.
The variable focus cold cathode X-ray tube provided by the application can directly emit electrons at room temperature based on field emission without consuming time and power to heat the cathode, so that the variable focus cold cathode X-ray tube has the advantages of quick start and low power consumption; meanwhile, cold cathode field emission also has the characteristics of instant on and off, so that the device has the advantages of high time resolution, controllable emission, small ineffective radiation dose and the like, and the active focusing mechanism realizes flexible adjustment of the size of a focal spot so as to meet different detection requirements.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (9)
1. A variable focus cold cathode X-ray tube comprising:
a tube body for mounting the components; the tube body having opposite first and second ends;
an electron generation assembly for generating electrons; the electron generation assembly is arranged at the first end of the tube body of the ray tube;
an electron collecting member for collecting the electrons generated by the electron generating member; the electron collecting assembly is arranged at the first end of the tube body of the ray tube and is adjacent to the electron generating assembly;
the electric field generating anode assembly is used for generating an electric field in the tube body of the ray tube together with the electric field generating cathode assembly; the electric field generating anode assembly is arranged at the second end of the tube body of the ray tube;
the electric field generating cathode assembly is used for generating an electric field in the tube body of the ray tube together with the electric field generating anode assembly; the electric field generating cathode assembly is arranged at the first end of the tube body of the ray tube and is adjacent to the electron generating assembly;
the ray window is used for receiving X rays obtained by bombarding the electric field generation anode assembly by the electrons collected by the electron collection assembly under the acceleration action of the electric field; the ray window is arranged on the side wall of the tube body of the ray tube.
2. The variable focus cold cathode X-ray tube of claim 1, wherein the electron generation assembly comprises: the cathode power supply is connected with the cathode.
3. The variable focus cold cathode X-ray tube of claim 1, wherein the electron collecting assembly comprises: the electron source comprises a focusing electrode and a focusing electrode power supply, wherein the focusing electrode is arranged at the first end of the tube body of the ray tube and is positioned at an electron emitting end of the electron generating assembly, and the focusing electrode power supply is connected with the focusing electrode.
4. The variable focus cold cathode X-ray tube of claim 1, wherein the electric field generating anode assembly comprises: the anode is arranged at the second end of the tube body of the ray tube, and the anode is connected with the anode power supply.
5. The variable focus cold cathode X-ray tube of claim 4, wherein the electric field generating anode assembly further comprises: the ceramic chip is arranged at the second end of the tube body of the ray tube, and the anode is arranged on the ceramic chip.
6. The variable focus cold cathode X-ray tube of claim 5, wherein the electric field generating anode assembly further comprises: and the radiator is arranged on the ceramic chip and is connected with the anode.
7. The variable focus cold cathode X-ray tube of claim 1, wherein the electric field generating cathode assembly comprises: and the grid is arranged at the first end of the tube body of the ray tube, is positioned between the cathode in the electron generation assembly and the gathering pole in the electron gathering assembly, and is connected with the gathering pole through an insulating supporting block.
8. The variable focus cold cathode X-ray tube of claim 1 wherein a getter is disposed within the tube body.
9. The variable focus cold cathode X-ray tube of claim 1 wherein an exhaust tube is provided on the tube body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021961520.6U CN212695118U (en) | 2020-09-09 | 2020-09-09 | Variable focus cold cathode X-ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021961520.6U CN212695118U (en) | 2020-09-09 | 2020-09-09 | Variable focus cold cathode X-ray tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212695118U true CN212695118U (en) | 2021-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021961520.6U Active CN212695118U (en) | 2020-09-09 | 2020-09-09 | Variable focus cold cathode X-ray tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212695118U (en) |
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2020
- 2020-09-09 CN CN202021961520.6U patent/CN212695118U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211126 Address after: 300384 No. 6 Huake No. 7 Road, Binhai New Area, Tianjin Binhai High-tech Industrial Development Zone Patentee after: CETC Energy Co.,Ltd. Address before: 300384 No. 6 Huake No. 7 Road, Binhai New Area, Tianjin Binhai High-tech Industrial Development Zone Patentee before: The 18th Research Institute of China Electronics Technology Group Corporation |
|
| TR01 | Transfer of patent right | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 300384 No. 6 Huake No. 7 Road, Binhai New Area, Tianjin Binhai High-tech Industrial Development Zone Patentee after: CETC Blue Sky Technology Co.,Ltd. Address before: 300384 No. 6 Huake No. 7 Road, Binhai New Area, Tianjin Binhai High-tech Industrial Development Zone Patentee before: CETC Energy Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |