CN112837982A - X-ray source - Google Patents
X-ray source Download PDFInfo
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- CN112837982A CN112837982A CN202110205802.6A CN202110205802A CN112837982A CN 112837982 A CN112837982 A CN 112837982A CN 202110205802 A CN202110205802 A CN 202110205802A CN 112837982 A CN112837982 A CN 112837982A
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- electron
- source
- electron emission
- ray source
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- 230000003068 static effect Effects 0.000 claims abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/16—Vessels; Containers; Shields associated therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/24—Tubes wherein the point of impact of the cathode ray on the anode or anticathode is movable relative to the surface thereof
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- X-Ray Techniques (AREA)
Abstract
The invention provides an X-ray source, which comprises a vacuum shell, an electron emission source, an electron multiplication device and an anode, wherein the electron emission source, the electron multiplication device and the anode are encapsulated in the vacuum shell; the electron multiplier is arranged behind the electron emission source and used for increasing tube current; and a two-dimensional microchannel plate with electron multiplication capability is arranged behind the electron emission source and used for solving the problem of close arrangement of the X-ray sources in a static space. The invention has the beneficial effects that: an X-ray source capable of providing more electrons, and a greater tube current, than existing cold electron emission cathode and photoemission cathode X-ray sources; an X-ray source array with a smaller spatial distance can be realized compared to a conventional thermionic X-ray source.
Description
Technical Field
The invention belongs to the field of X-ray sources, and particularly relates to an X-ray source.
Background
The most commonly used and mature electron emission source of the X-ray source at present includes a hot cathode method, a photocathode method and a cold cathode method, and the hot cathode method has long filament preheating time and cannot realize rapid electron emission; the contradiction between preheating time and rapid emission can be made up through grid control, but grid control voltage is high, mechanism size is large, and it is difficult to realize a dense multi-cathode multi-focus X-ray source, and the common problem of the photocathode method and the cold cathode method is that electron emission capability is weak, so that tube current of the X-ray source is small.
Disclosure of Invention
In view of the above, the present invention is directed to an X-ray source to solve the above-mentioned problems.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an X-ray source comprises a vacuum shell, an electron emission source, an electron multiplication device and an anode, wherein the electron emission source, the electron multiplication device and the anode are encapsulated in the vacuum shell;
the electron multiplier is arranged behind the electron emission source and used for increasing tube current;
and a two-dimensional microchannel plate with electron multiplication capability is arranged behind the electron emission source and used for solving the problem of close arrangement of the X-ray sources in a static space.
Further, the electron emission source includes a non-thermal electron emission type electron emission source.
Further, the electron emission source of the non-thermionic emission type includes a cold cathode electron source, a photoelectronic source, and an electron source formed by combining the cold cathode electron source and the photoelectronic source through any space.
Further, the electron multiplying device includes a photomultiplier type electron multiplying device and a microchannel plate type electron multiplying device.
Further, the exit window of the electron multiplying device is a cathode.
Further, the electron source device comprises a vacuum shell, and a cold cathode emission type electron emission source, an electron multiplier tube structure type electron multiplier device and an anode which are arranged in the vacuum shell in sequence.
Further, the electron multiplier comprises a vacuum shell, and a photocathode type electron emission source, an electron multiplier structure type electron multiplier and an anode which are arranged in the vacuum shell in sequence.
Further, the device comprises a vacuum shell, and a cold cathode emission type electron emission source, a micro-channel plate type electron multiplier device and an anode which are arranged in the vacuum shell in sequence.
Further, the exit window of the electron multiplying device is the real cathode of the X-ray source.
Further, the vacuum enclosure serves to ensure that the electrons are not scattered or absorbed before they strike the anode.
Compared with the prior art, the X-ray source has the following beneficial effects:
(1) compared with the existing cold electron emission cathode and photoelectric emission cathode X-ray sources, the X-ray source provided by the invention can provide more electrons and larger tube current.
(2) Compared with the traditional thermionic X-ray source, the X-ray source array with smaller space distance can be realized.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of an X-ray source according to an embodiment of the present invention;
fig. 2 is a schematic structural view of an electron multiplier device of the type having a cold cathode emission source and a photomultiplier according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of an electron emission source having a photocathode type and an electron multiplier device having a photomultiplier type according to an embodiment of the present invention;
fig. 4 is a schematic structural view of an electron multiplier device having a cold cathode emission type electron emission source and a microchannel plate type according to an embodiment of the present invention;
FIG. 5 is a schematic structural view of an electron emission source having a photocathode type and an electron multiplier device having a microchannel plate type according to an embodiment of the present invention;
fig. 6 is a schematic view of an X-ray source according to an embodiment of the present invention.
Description of reference numerals:
1-an electron emission source; 100-electron emission source of cold cathode emission type; 101-photocathode type electron emission source; 2-electron multiplying means; 200-electron multiplier device of electron multiplier tube structure type; 201-electron multiplying device of microchannel plate type; 3-an anode; 4-vacuum shell.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 to 6, an X-ray source includes a vacuum housing, and an electron emission source, an electron multiplier device and an anode enclosed in the vacuum housing;
the electron multiplier is arranged behind the electron emission source and used for increasing tube current;
and a two-dimensional microchannel plate with electron multiplication capability is arranged behind the electron emission source and used for solving the problem of close arrangement of the X-ray sources in a static space.
The electron emission source includes a non-thermal electron emission type electron emission source.
The electron emission source of the non-thermionic emission type includes a cold cathode electron source, a photoelectronic source, and also includes an electron source formed by any spatial combination of the cold cathode electron source and the photoelectronic source.
The electron multiplying device includes a photomultiplier type electron multiplying device and a microchannel plate type electron multiplying device.
The exit window of the electron multiplying device is a cathode.
The electron multiplier comprises a vacuum shell, a cold cathode emission type electron emission source, an electron multiplier structure type electron multiplier device and an anode, wherein the cold cathode emission type electron emission source, the electron multiplier structure type electron multiplier device and the anode are sequentially arranged in the vacuum shell.
Comprises a vacuum shell, a photocathode type electron emission source, an electron multiplier tube structure type electron multiplier device and an anode which are sequentially arranged in the vacuum shell.
Comprises a vacuum shell, a cold cathode emission type electron emission source, a micro-channel plate type electron multiplier and an anode which are arranged in the vacuum shell in sequence.
The exit window of the electron multiplying device is the real cathode of the X-ray source.
The vacuum enclosure is used to ensure that the electrons are not scattered or absorbed before they strike the anode.
In the implementation process, the first problem to be solved by the application is the problem that the electron emission capability of the electron source is low in the non-hot cathode scheme. The technical scheme for solving the problem is that an electron multiplier is added behind a non-hot cathode electron source, so that the tube current is greatly improved.
A second problem to be solved by the present application is the close spatial arrangement of the X-ray sources in static space. The technical scheme for solving the problem is that a tightly arranged photoelectric electron source or a cold cathode emission source is followed by a two-dimensional microchannel plate with electron multiplication capacity.
As shown in FIG. 1, the X-ray source proposed by the present application is composed of an electron emission source 1, an electron multiplier 2, and an anode 3, which are enclosed in a vacuum envelope 4.
The electron emission source 1 is generally of a non-thermal electron emission type; because the electron emission source of the thermal electron emission type has enough electron emission capability, the corresponding tube current is ensured; the non-thermionic emission type electron emission source may be a cold cathode electron source, or a photoelectron source, as well as any spatial combination of the above sources.
With respect to the electron multiplier 2, the electrons emitted from the electron emission source 1 enter the electron multiplier 2 by its kinetic energy or with the help of an auxiliary electric field; the electron multiplier device 2 is divided into a photomultiplier type electron multiplier device 200 and a microchannel plate type electron multiplier device 201:
an electron multiplier device 200 of a photomultiplier type, as shown in fig. 2 and 3; the electron emission source 2 in fig. 2 employs an electron emission source 100 of a cold cathode emission type; the electron emission source 2 in fig. 3 employs a photocathode type electron emission source 101;
a microchannel plate type electron multiplier 201 as shown in fig. 4, 5; the electron emission source 2 in fig. 4 employs an electron emission source 100 of a cold cathode emission type; the electron emission source 2 in fig. 5 employs a photocathode type electron emission source 101;
the exit window of the electron multiplier 2 is the real cathode of the X-ray source;
after the electrons bombard the anode 3, X rays are generated;
the vacuum enclosure 4 serves to ensure that the electrons are not scattered or absorbed before they strike the anode 3.
Meanwhile, when the electron multiplying device is a microchannel plate, the X-ray source is matched with an electron source and other related designs, so that a linear array X-ray source and a planar light source can be formed;
when the spiral light source is formed, the CT system with the static light source and the static detector can be formed by matching single-row detectors and multi-row detectors which are oppositely arranged.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An X-ray source, characterized by: comprises a vacuum shell, an electron emission source, an electron multiplication device and an anode which are encapsulated in the vacuum shell;
the electron multiplier is arranged behind the electron emission source and used for increasing tube current;
and a two-dimensional microchannel plate with electron multiplication capability is arranged behind the electron emission source and used for solving the problem of close arrangement of the X-ray sources in a static space.
2. An X-ray source according to claim 1, characterized in that: the electron emission source includes a non-thermal electron emission type electron emission source.
3. An X-ray source according to claim 2, characterized in that: the electron emission source of the non-thermionic emission type includes a cold cathode electron source, a photoelectronic source, and also includes an electron source formed by any spatial combination of the cold cathode electron source and the photoelectronic source.
4. An X-ray source according to claim 1, characterized in that: the electron multiplying device includes a photomultiplier type electron multiplying device and a microchannel plate type electron multiplying device.
5. An X-ray source according to claim 1, characterized in that: the exit window of the electron multiplying device is a cathode.
6. An X-ray source according to claim 1, characterized in that: the electron multiplier comprises a vacuum shell, a cold cathode emission type electron emission source, an electron multiplier structure type electron multiplier device and an anode, wherein the cold cathode emission type electron emission source, the electron multiplier structure type electron multiplier device and the anode are sequentially arranged in the vacuum shell.
7. An X-ray source according to claim 1, characterized in that: comprises a vacuum shell, a photocathode type electron emission source, an electron multiplier tube structure type electron multiplier device and an anode which are sequentially arranged in the vacuum shell.
8. An X-ray source according to claim 1, characterized in that: comprises a vacuum shell, a cold cathode emission type electron emission source, a micro-channel plate type electron multiplier and an anode which are arranged in the vacuum shell in sequence.
9. An X-ray source according to claim 1, characterized in that: the exit window of the electron multiplying device is the real cathode of the X-ray source.
10. An X-ray source according to claim 1, characterized in that: the vacuum enclosure is used to ensure that the electrons are not scattered or absorbed before they strike the anode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110205802.6A CN112837982A (en) | 2021-02-24 | 2021-02-24 | X-ray source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110205802.6A CN112837982A (en) | 2021-02-24 | 2021-02-24 | X-ray source |
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| Publication Number | Publication Date |
|---|---|
| CN112837982A true CN112837982A (en) | 2021-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110205802.6A Pending CN112837982A (en) | 2021-02-24 | 2021-02-24 | X-ray source |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0412497A (en) * | 1990-04-27 | 1992-01-17 | Shimadzu Corp | X-ray generator |
| CN1560889A (en) * | 2004-02-16 | 2005-01-05 | 谭大刚 | Compound cathode having nano-carbon tube as field emission body with electronic multiplier grid-control function |
| US20140044239A1 (en) * | 2012-08-08 | 2014-02-13 | Keith C. Gendreau | Miniaturized high-speed modulated x-ray source |
| CN108922842A (en) * | 2018-06-13 | 2018-11-30 | 山东航天电子技术研究所 | Modulated X-ray generator and method based on microchannel plate |
| US10895540B1 (en) * | 2018-05-08 | 2021-01-19 | United States Of America As Represented By The Administrator Of Nasa | Tomographic imaging system |
| CN214203602U (en) * | 2021-02-24 | 2021-09-14 | 天津金曦医疗设备有限公司 | X-ray source |
-
2021
- 2021-02-24 CN CN202110205802.6A patent/CN112837982A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0412497A (en) * | 1990-04-27 | 1992-01-17 | Shimadzu Corp | X-ray generator |
| CN1560889A (en) * | 2004-02-16 | 2005-01-05 | 谭大刚 | Compound cathode having nano-carbon tube as field emission body with electronic multiplier grid-control function |
| US20140044239A1 (en) * | 2012-08-08 | 2014-02-13 | Keith C. Gendreau | Miniaturized high-speed modulated x-ray source |
| US10895540B1 (en) * | 2018-05-08 | 2021-01-19 | United States Of America As Represented By The Administrator Of Nasa | Tomographic imaging system |
| CN108922842A (en) * | 2018-06-13 | 2018-11-30 | 山东航天电子技术研究所 | Modulated X-ray generator and method based on microchannel plate |
| CN214203602U (en) * | 2021-02-24 | 2021-09-14 | 天津金曦医疗设备有限公司 | X-ray source |
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