CN111246648A - Coaxial multi-pulse output driving mechanism - Google Patents
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- CN111246648A CN111246648A CN202010161339.5A CN202010161339A CN111246648A CN 111246648 A CN111246648 A CN 111246648A CN 202010161339 A CN202010161339 A CN 202010161339A CN 111246648 A CN111246648 A CN 111246648A
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- 238000002601 radiography Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 5
- 238000002955 isolation Methods 0.000 description 6
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05G—X-RAY TECHNIQUE
- H05G2/00—Apparatus or processes specially adapted for producing X-rays, not involving X-ray tubes, e.g. involving generation of a plasma
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B39/00—High-speed photography
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B42/00—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means
- G03B42/02—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means using X-rays
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
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Abstract
The invention discloses a coaxial multi-pulse output driving mechanism, which adopts N groups of high-voltage pulse generating devices connected in series, wherein each group of high-voltage pulse generating devices comprises two pulse power sources, all the pulse power sources are connected in series with a circuit, and the two pulse power sources in each group of high-voltage pulse generating devices are distributed relatively in space; the output electrode parts of the N groups of high-voltage pulse generating devices are integrated into a whole to form an N +1 electrode coaxial structure and are used for configuring N loads; the pulse power source adopts an induction superposition type pulse power source, and N is a positive integer more than or equal to 2. The invention provides a coaxial photographing technology based on an induction superposition type pulse power device, which can realize coaxial arrangement of a plurality of diodes with voltage (1 MV-10 MV) and large current (10 kA-100 kA) above MV, work according to a preset time sequence and realize ideal coaxial multi-picture photographing.
Description
Technical Field
The invention belongs to the technical field of pulse, and particularly relates to a coaxial multi-pulse output driving mechanism which can be used for but not limited to the technical field of flash photography.
Background
Flash photography utilizes a pulse power device to generate short pulses (pulse width is tens of ns) of hard X-rays to penetrate an object and receive the X-rays containing object information after penetrating the object, and because the pulse width of the X-rays is very short, images in the object moving at high speed can be obtained. Generally, a pulse power device is used for generating high-power electric pulses, the high-power electric pulses are loaded on a diode to generate focused high-current relativistic electron beams to bombard a high-Z material target to generate bremsstrahlung radiation to generate X rays. To record images of an object moving at high speed at different times from a certain viewing angle, multiple photographs are taken at the same viewing angle, and thus, coaxial multi-pulse X-rays are generated.
A flash photo diode (e.g., a Rod-pin diode, a Self-pinchdode) commonly used under MV-level high voltage conditions cannot be repeatedly operated because the deposition energy is large and the operation process is destructive. The existing compromise scheme is to adopt a plurality of pulse power devices to respectively drive diodes to generate X-rays, and adopt a special design to make a plurality of diodes close to each other in space so as to realize approximate coaxial multi-image photographing. An example is provided in the prior art (Sorenson, Danny Scott; pazu mechanics, p.; Wood, m.; Update: Red Sage soft radiation, LA-UR-16-23467), such as the X-ray radiography device with a single pulse shown in fig. 1, because the working voltage is low (tube voltage-200 kV), the high voltage insulation problem is easy to solve, the diode region can be very compact, multiple diodes can be closely arranged to realize approximately coaxial multiple-picture taking, and fig. 2 is a 4-picture radiography device arrangement based on the device shown in fig. 1. However, in applications requiring high X-ray doses and dose rates, requiring higher voltages (greater than 1MV) and higher currents (greater than 10kA), the device cannot be compact and the diodes cannot be very close together, so that deviations in the photographic geometry are unavoidable and the desired coaxial multiple photographic effect cannot be obtained.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in applications requiring very high X-ray doses and dose rates, higher voltages and higher currents are required, the device cannot be very compact due to high voltage isolation problems, and multiple diodes cannot be very close together, so that geometrical deviations in photography cannot be avoided and relatively ideal coaxial multi-picture photography cannot be obtained; the present invention provides a coaxial multi-pulse output driving mechanism which solves the above problems. The invention provides a coaxial photographing technology based on an induction superposition type pulse power device, which can realize coaxial arrangement of a plurality of diodes with voltage (1 MV-10 MV) and large current (10 kA-100 kA) above MV, work according to a preset time sequence and realize ideal coaxial multi-picture photographing.
The invention is realized by the following technical scheme:
a coaxial multi-pulse output driving mechanism adopts N groups of high-voltage pulse generating devices connected in series, each group of high-voltage pulse generating devices comprises two pulse power sources, all the pulse power sources are connected in series with a circuit, and the two pulse power sources in each group of high-voltage pulse generating devices are distributed relatively in space; the output electrode parts of the N groups of high-voltage pulse generating devices are integrated into a whole to form an N +1 electrode coaxial structure and are used for configuring N loads; the pulse power source adopts an induction superposition type pulse power source, and N is a positive integer more than or equal to 2.
Further, an inductive superposition type pulse power source IVA or an inductive superposition type pulse power source LTD is adopted.
Further, the N loads are all positive polarities, or all negative polarities, or a combination of positive and negative polarities. The polarity of the loading voltage obtained on the load can be flexibly configured according to requirements.
Further, the load includes an X-ray diode. The driving circuit is used for driving the X-ray diode, is an electrical application, has great practical value and can be used in other occasions.
Further, when the device is used for diode X flash photography, a separation plate is arranged between adjacent loads and is used for space separation and electrical separation.
Further, the device comprises two groups of high-voltage pulse generating devices connected in series: a generating device I and a generating device II; the generating device I comprises a pulse power source I and a pulse power source II, and the generating device II comprises a pulse power source III and a pulse power source IV; the secondary ends of the pulse power source III, the pulse power source I, the pulse power source II and the pulse power source IV are sequentially connected in series; two electrodes I are led out from a common conductor of a pulse power source I and a pulse power source II, one electrode II is led out from a common conductor of the pulse power source I and a pulse power source III and from a common conductor of the pulse power source II and a pulse power source IV respectively, and one electrode III is led out from the secondary ends of the pulse power source III and the pulse power source IV respectively; the electrode I, the electrode II and the electrode III are coaxially arranged; three electrodes, electrode I, electrode II and electrode III, are used to configure two loads.
Furthermore, in the working state, one load is configured between the electrode I and the electrode II, and the other load is configured between the electrode II and the electrode III.
The application of the coaxial flash photographic device obtains pulse outputs with different time sequences by setting different discharge time intervals of the N groups of high-voltage pulse generating devices.
Furthermore, the method is suitable for the conditions that the working voltage is larger than 1MV and the working current is larger than 10kA, and the other prior art can not be suitable for the high-voltage and high-current working conditions.
The inductive superposition type pulse power source (IVA or LTD) leads the two ends of the load to be in a grounding state when viewed from the outside due to the inductive isolation effect of the magnetic core. This feature makes it possible to combine two pulsed power sources (IVA or LTD) in series into a double-pulse device, and its output structure can provide the condition for the coaxial placement of the two diodes. Under the configuration, two groups of pulse power sources (IVA or LTD) can work at different moments, and two diodes are driven to carry out two more accurate coaxial photographs. The specific scheme is as follows: the IVA sensing chambers or LTD modules are divided into two groups: generating device I and generating device II. The output of the generating device I is a coaxial line formed by an electrode I and an electrode II, the electrode I is a high-voltage electrode during working, and the electrode II is a ground electrode; the output of the generating device II is a coaxial line formed by an electrode II and an electrode III, the electrode II is a high-voltage electrode during working, and the electrode III is a ground electrode. Because of the inductive isolation effect of the magnetic core, the two groups of IVA inductive cavities or LTD modules can be regarded as two completely independent devices, different time delays can be set randomly according to requirements, in order to avoid the influence of diode discharge products, the generation device I must discharge firstly, and the generation device II discharges later.
The invention has the following advantages and beneficial effects:
if images at the same angle and different moments in the high-speed dynamic process are to be obtained, coaxial multiple flash photography is needed. A flash photo diode (e.g., a Rod-pin diode, a Self-pin diode) commonly used under the MV-level high voltage condition has a large deposition energy and is destructive in a working process, so that repeated work cannot be realized; due to the limitation of the output structure of the conventional power source, the coaxial arrangement of a plurality of diodes cannot be realized. Therefore, it is difficult to achieve coaxial multi-shot photographing. The existing compromise method is to use multiple power sources to drive the diodes respectively, so that the diodes are as close as possible in space, thereby realizing approximately coaxial photography, and the method can only be applied to the occasions with lower voltage, and in the occasions with higher voltage (more than 1MV), because of the limitation of high voltage and device volume, the multiple diodes can not be close to each other, therefore, the deviation of the photography geometry can not be avoided.
According to the invention, the inductive superposition type pulse power source (IVA or LTD) is used, and both ends of the load are in a grounding state when viewed from the outside due to the inductive isolation effect of the magnetic core. This feature makes it possible to combine multiple sets of pulsed power sources (IVA or LTD) in series into a double-pulse device, with the output structure providing for the co-axial placement of multiple diodes. Under the configuration, multiple groups of pulse power sources (IVA or LTD) can work at different moments, and the diodes are driven to carry out more accurate multiple coaxial photographs. The limitation that the strong current diode cannot be reused and cannot generate two X-ray pulses is avoided, and the limitation that a plurality of diodes are arranged close to each other but cannot be arranged on the same axis in other technical schemes is also avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of a single low voltage radiography device high voltage transmission and diode regions;
FIG. 2 is a schematic diagram of a 4-frame arrangement of the diode region of the radiography device under low voltage conditions;
FIG. 3 is a general schematic diagram of a coaxial dipulse photographic apparatus of the present invention;
FIG. 4 is a two positive polarity RPD configuration
Fig. 5 is a two negative polarity RPD configuration.
Reference numerals and corresponding part names in fig. 3-5: 1-electrode I, 2-electrode II, 3-electrode III, 4-magnetic core, 5-induction cavity, A-generating device I, B-generating device II.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
The embodiment provides a coaxial multi-pulse output driving mechanism, which adopts N groups of high-voltage pulse generating devices connected in series, wherein each group of high-voltage pulse generating devices comprises two pulse power sources, all the pulse power sources are connected in series with a circuit, and the two pulse power sources in each group of high-voltage pulse generating devices are distributed relatively in space; the output electrode parts of the N groups of high-voltage pulse generating devices are integrated into a whole to form an N +1 electrode coaxial structure, are used for configuring N loads and are of a nested structure; the pulse power source adopts an induction superposition type pulse power source, and N is a positive integer more than or equal to 2.
The inductive superposition type pulse power source (IVA or LTD) leads the two ends of the load to be in a grounding state when viewed from the outside due to the inductive isolation effect of the magnetic core. This feature makes it possible to combine multiple sets of pulsed power sources (IVA or LTD) in series into a double-pulse device, with the output structure providing for the co-axial placement of multiple diodes. Under the configuration, multiple groups of pulse power sources (IVA or LTD) can work at different moments, and the diodes are driven to carry out more accurate multiple coaxial photographs.
Example 2
The embodiment provides a coaxial multi-pulse output driving mechanism, as shown in fig. 1, which comprises two sets of high-voltage pulse generating devices connected in series: a generating device I and a generating device II; the generating device I comprises a pulse power source I and a pulse power source II; the generating devices II respectively comprise a pulse power source III and a pulse power source IV, and each pulse power source adopts an induced voltage adder or a linear variable voltage driving source. The secondary ends of the pulse power source III, the pulse power source I, the pulse power source II and the pulse power source IV are sequentially connected in series. Two electrodes I are led out from a common conductor of the pulse power source I and the pulse power source II, one electrode II is led out from a common conductor of the pulse power source I and the pulse power source III and a common conductor of the pulse power source II and the pulse power source IV respectively, and one electrode III is led out from the secondary ends of the pulse power source III and the pulse power source IV respectively.
The electrode I, the electrode II and the electrode III are coaxially arranged; the three electrodes of the electrode I, the electrode II and the electrode III are used for configuring two loads, the loads are X-ray diodes, and the two X-ray diodes are both positive poles or both negative poles or are a combination of positive poles and negative poles.
The load zone (X-ray generating diodes, i.e. the load of the front power source) as shown in fig. 4 and 5, different diode configurations can be provided, as the IVA or LTD can operate at different polarities. To name just two examples: FIG. 4 is a schematic representation of two positive polarity RPD configurations, in operation, with a set of generators I having positive high voltage output electrodes I and ground potential electrodes I; the output electrode II of the other group of generating devices II is positive high voltage, and the electrode III is the ground potential. Similarly, fig. 5 shows two RPD with negative polarity, and when the device is in operation, the output electrode I of one group of generating devices is at negative high voltage, and the electrode II is at ground potential; the output electrode II of the other group of generating devices II is negative high voltage, and the electrode III is the ground potential. The combination of positive and negative can also be used. The two diodes are isolated in space by a 1mm isolation plate (an aluminum plate is adopted in the embodiment), and the X-ray cannot be greatly attenuated. With the front and back diodes perfectly coaxial, the front diode anode (high Z material) may affect the back X-ray transmission, slightly out of position.
In summary, in the present embodiment, an Induced Voltage Adder (IVA) and a Linear Transformer Driver (LTD) are used as a high Voltage pulse generator, and two groups of IVA or LTD are connected in series in a spatial structure, so that the output parts of the two groups of IVA or LTD are integrated into a whole to form a triaxial structure, and two X-ray diodes are spatially configured on the structure and arranged on the same axis. By setting two different sets of discharge time intervals of IVA or LTD, two X-ray pulses according to a preset timing can be obtained. The limitation that the strong current diode cannot be used repeatedly and cannot generate two X-ray pulses is avoided, and the limitation that a plurality of diodes are arranged close to each other but cannot be arranged on the same axis in other technical schemes is also avoided; the high-voltage X-ray tube can be suitable for high voltage of more than 1MV and strong current of more than 10kA (1-10 MV and 10-100 kA), and can meet the requirements of high X-ray dose and dose rate application occasions.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A coaxial multi-pulse output driving mechanism is characterized in that N groups of high-voltage pulse generating devices connected in series are adopted, each group of high-voltage pulse generating devices comprises two pulse power sources, all the pulse power sources are connected in series with a circuit, and the two pulse power sources in each group of high-voltage pulse generating devices are distributed in a space relative mode; the output electrode parts of the N groups of high-voltage pulse generating devices are integrated into a whole to form an N +1 electrode coaxial structure and are used for configuring N loads;
the pulse power source adopts an induction superposition type pulse power source, and N is a positive integer more than or equal to 2.
2. The coaxial multi-pulse output driving mechanism as claimed in claim 1, wherein the pulse power source is an inductive superposition type pulse power source IVA or an inductive superposition type pulse power source LTD.
3. The coaxial multi-pulse output driving mechanism according to claim 1, wherein the N loads are all positive or all negative or a combination of positive and negative.
4. A coaxial multi-pulse output drive mechanism according to claim 1, wherein said load comprises an X-ray diode.
5. A coaxial multi-pulse output driving mechanism according to claim 4, wherein a separation plate is provided between adjacent loads for spatial and electrical separation when used in diode radiography.
6. A coaxial multi-pulse output driving mechanism according to any one of claims 1 to 5, comprising two sets of high voltage pulse generating devices connected in series: a generating device I and a generating device II; the generating device I comprises a pulse power source I and a pulse power source II, and the generating device II comprises a pulse power source III and a pulse power source IV;
the secondary ends of the pulse power source III, the pulse power source I, the pulse power source II and the pulse power source IV are sequentially connected in series;
two electrodes I are led out from a common conductor of a pulse power source I and a pulse power source II, one electrode II is led out from a common conductor of the pulse power source I and a pulse power source III and from a common conductor of the pulse power source II and a pulse power source IV respectively, and one electrode III is led out from the secondary ends of the pulse power source III and the pulse power source IV respectively;
the electrode I, the electrode II and the electrode III are coaxially arranged; three electrodes, electrode I, electrode II and electrode III, are used to configure two loads.
7. A coaxial multi-pulse output driving mechanism according to claim 6, wherein in operation, one load is configured between electrode I and electrode II, and the other load is configured between electrode II and electrode III.
8. Use of a coaxial multiple pulse output drive mechanism according to any one of claims 1 to 7, wherein pulse outputs of different timings are obtained by setting different discharge time intervals of the N groups of high voltage pulse generating devices.
9. Use of a coaxial multipulse output drive mechanism according to claim 8, characterised in that it is adapted for operating voltages > 1MV and operating currents > 10 kA.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030210764A1 (en) * | 2002-05-10 | 2003-11-13 | Tekletsadik Kasegn Dubale | Pulsed power application for x-ray tube |
| CN101042976A (en) * | 2007-03-27 | 2007-09-26 | 西北核技术研究所 | Repeat frequency fast pulse hard x-ray generator |
| CN105187031A (en) * | 2015-09-06 | 2015-12-23 | 西北核技术研究所 | Multi-stage series-connected LTD of common cavity, and trigger method thereof |
| CN107070436A (en) * | 2017-04-25 | 2017-08-18 | 中国工程物理研究院流体物理研究所 | A kind of LTD tandem arrangements |
| CN109449071A (en) * | 2018-11-12 | 2019-03-08 | 中国工程物理研究院应用电子学研究所 | A kind of high brightness X-ray soures of pulse power driving |
| CN211831305U (en) * | 2020-03-10 | 2020-10-30 | 中国工程物理研究院流体物理研究所 | Multi-pulse flash photographic driving device |
-
2020
- 2020-03-10 CN CN202010161339.5A patent/CN111246648A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030210764A1 (en) * | 2002-05-10 | 2003-11-13 | Tekletsadik Kasegn Dubale | Pulsed power application for x-ray tube |
| CN101042976A (en) * | 2007-03-27 | 2007-09-26 | 西北核技术研究所 | Repeat frequency fast pulse hard x-ray generator |
| CN105187031A (en) * | 2015-09-06 | 2015-12-23 | 西北核技术研究所 | Multi-stage series-connected LTD of common cavity, and trigger method thereof |
| CN107070436A (en) * | 2017-04-25 | 2017-08-18 | 中国工程物理研究院流体物理研究所 | A kind of LTD tandem arrangements |
| CN109449071A (en) * | 2018-11-12 | 2019-03-08 | 中国工程物理研究院应用电子学研究所 | A kind of high brightness X-ray soures of pulse power driving |
| CN211831305U (en) * | 2020-03-10 | 2020-10-30 | 中国工程物理研究院流体物理研究所 | Multi-pulse flash photographic driving device |
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