CN104833998A - Two-dimensional scanning imaging detection system and detection method for tritium distribution on surface of metal tritide film target - Google Patents
Two-dimensional scanning imaging detection system and detection method for tritium distribution on surface of metal tritide film target Download PDFInfo
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- CN104833998A CN104833998A CN201510238460.2A CN201510238460A CN104833998A CN 104833998 A CN104833998 A CN 104833998A CN 201510238460 A CN201510238460 A CN 201510238460A CN 104833998 A CN104833998 A CN 104833998A
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Abstract
A two-dimensional scanning imaging detection system and a detection method for tritium distribution on the surface of a metal tritide film target are provided. The system comprises a vacuum chamber and two stepping motors connected with a computer. A driving mechanism is arranged between the vacuum chamber and the stepping motors to drive connecting rods to make reciprocating movement. The two connecting rods are respectively connected with a displacement sample stage and a collimator, and the collimator is internally provided with a current probe. The system further provides an oil-free scroll vacuum pump and a turbo molecular pump. The detection method comprises the following steps: a metal tritide film target is placed on the displacement sample stage; vacuum pumping is carried out; one stepping motor pushes the displacement sample stage to do stepping motion along an X axis, and line scanning is performed on the surface of the metal tritide film target along the X axis; the other stepping motor drives the collimator to do stepping motion along a Y axis, and line scanning is performed on the surface of the metal tritide film target along the Y axis; and the computer reads a current signal and obtains an image of tritium distribution on the surface of the metal tritide film target. The detection system directly scans the two-dimensional distribution of beta ray flux of a measured sample, is high in measurement accuracy, and has a good imaging effect.
Description
Technical field
The invention belongs to checkout equipment technical field, relate to the two-dimensional imaging detection system of a kind of metal tritides film target surface tritium distribution; The invention still further relates to this detection system a kind of to distribute the method detected to metal tritides film target surface tritium.
Background technology
Metal tritides film target has special purposes as the target of neutron generator and β radiation source at numerous areas such as metallurgy, biological chemistry, neutron therapy, neutron photography, petroleum prospecting, instrumental analysis.The tritium distribution of metal tritides film target surface is the important indicator of assessment metal tritides film target performance.
The tritium distribution of metal tritides film target surface detects and mainly adopts β autoradiograph technology at present, and this technology for detection process is loaded down with trivial details.And due to egative film selection, radioactive source activity, β ray scattering, darkroom the factor such as design on egative film exposure and video picture impact comparatively large, cause the time shutter of egative film the best and development, the bad control of fixing conditions, imaging effect not good.
Tritium decay in metal tritides film target produces β ray, β ray is isotropically launched to 4 π solid angles, β ray has certain range in metal tritides film target, and target surface and the Beta-ray distribution situation near surf zone injection can reflect the situation of surperficial tritium distribution.The Two dimensional Distribution of the β ray flux adopting current probe and collimating apparatus scanning survey metal tritides film target to penetrate, then just can obtain the image of metal tritides film target surface tritium distribution by image reconstruction.
While in metal tritides film target, tritium decay produces low energy beta rays, the bremsstrahlung of low energy beta rays and target material atom produces a large amount of low energy X rays, energy overlaps with β ray energy in a big way, this is just for β autoradiograph method and the distribution of nuclear detector measured surface tritium cause certain difficulty, and the present invention adopts electrometer and current probe technology to obtain the distribution of tritium target surface tritium by directly measuring the β ray flux distribution of tritium target surface, avoid the impact of different depth bremsstrahlung X-ray effects on surface radionetric survey in tritium target, the measurement of effects on surface tritium distribution is very favorable.On the other hand, adopt computer controlled automatic and data acquisition process, make imaging realize digitizing, be convenient to data Storage and Processing; Testing process realizes robotization.
Summary of the invention
The object of this invention is to provide the two-dimensional scan image-forming detecting system of a kind of metal tritides film target surface tritium distribution, detect the tritium distribution of metal tritides film target surface, process is simple, and imaging effect is good.
Another object of the present invention is to provide a kind of method that said detecting system detects the tritium distribution of metal tritides film target surface.
For achieving the above object, the technical solution adopted in the present invention is: the two-dimensional scan image-forming detecting system of a kind of metal tritides film target surface tritium distribution, comprises base, base is provided with vacuum chamber and two stepper motors, vacuum corrugated pipe and driving mechanism is provided with between vacuum chamber and stepper motor, one end of vacuum corrugated pipe is connected with vacuum chamber, the sealed end of vacuum corrugated pipe is connected with one end of connecting link, the other end of connecting link stretches in vacuum chamber through the sidewall of vacuum corrugated pipe and vacuum chamber, these two connecting links are mutually vertical, one end that wherein connecting link stretches in vacuum chamber is connected with displacement sample stage, another root connecting link is connected with the collimating apparatus be vertically arranged in vacuum chamber, current probe is provided with in collimating apparatus, one end of current probe is stretched in collimating apparatus, and towards the workplace of displacement sample stage, the other end of current probe is connected with concentric cable, concentric cable is connected with electrometer, driving mechanism and vacuum corrugated pipe drive connecting link to move back and forth along own axes direction, two stepper motors are all connected with controllor for step-by-step motor, and this controllor for step-by-step motor is all connected with Computer signal with electrometer, be provided with oil-free scroll vacuum pump and turbomolecular pump in base, oil-free scroll vacuum pump is connected by the first push-pull valve with turbomolecular pump, turbomolecular pump is connected with vacuum chamber by the second push-pull valve.
Described driving mechanism comprises displaced block and grinding screw rod, and grinding screw rod is by driving stepper motor, and displaced block is between grinding screw rod and vacuum corrugated pipe, and one end of displaced block is connected with grinding screw rod, and the other end is connected with the sealed end of vacuum corrugated pipe.
Another technical scheme of the present invention is: a kind of said detecting system, to the detection method of metal tritides film target surface tritium distribution, is specifically carried out according to the following steps:
Step 1: open vacuum chamber, is fixed on displacement sample stage towards on the table top of collimating apparatus by metal tritides film target sample, close vacuum chamber;
Step 2: start oil-free scroll vacuum pump, as the vacuum tightness≤2Pa of vacuum indoor, starts turbomolecular pump;
Step 3: when vacuum tightness≤1.0 × 10 of vacuum indoor
-3during Pa, start-up simulation machine, initialization serial communication interface, setting scanning step, scanning initial position, carries out zero correction to electrometer; Then send X-axis control command to controllor for step-by-step motor, a stepper motor starts, and this stepper motor promotes displacement sample stage along X-axis step motion by driving mechanism, and current probe completes X-direction one line scanning of metal tritides film target surface; Computing machine sends Y axle control command to controllor for step-by-step motor, another stepper motor starts, this driving stepper motor mechanism drives collimating apparatus along Y-axis step motion by another set of driving mechanism, and current probe completes Y direction one line scanning of metal tritides film target surface; Then the scanning of X-direction next line is started; In scanning process, computing machine reads the current signal of each scanning position of metal tritides film target surface by electrometer, and save the data in in X-axis and the Y-axis coordinate two-dimensional array that is address, after metal tritides film target surface has all been scanned, the scan-data of preservation has carried out mapping and has obtained the image of metal tritides film target surface tritium distribution by computing machine.
Detection system tool of the present invention has the following advantages:
1) under vacuum condition, can be avoided by the Two dimensional Distribution of the β ray flux of direct scanning survey sample that prior art mediella is selected, the activity of radioactive source, β ray scattering, darkroom the factor such as design on the impact of image quality, accuracy of measurement is high, and imaging effect is good.
2) adopt computer controlled automatic and data acquisition process, make imaging realize digitizing, be convenient to data Storage and Processing; Testing process realizes robotization.
Accompanying drawing explanation
Fig. 1 is the structural representation of detection system of the present invention.
Fig. 2 is the A-A cut-open view of Fig. 1.
Fig. 3 is metal tritides film target schematic diagram.
Fig. 4 is the 2-d reconstruction figure of the film target of metal tritides shown in Fig. 3 surface tritium distribution.
Fig. 5 is the three-dimensional reconstruction figure of the film target of metal tritides shown in Fig. 3 surface tritium distribution.
In Fig. 1 and Fig. 2: 1. base, 2. vacuum chamber, 3. concentric cable, 4. displacement sample stage, 5. current probe, 6. collimating apparatus, 7. support, 8. the first vacuum corrugated pipe, 9. the first stepper motor, 10. computing machine, 11. electrometers, 12. oil-free scroll vacuum pumps, 13. first push-pull valves, 14. second push-pull valves, 15. turbomolecular pumps, 16. protective covers, 17. first grinding screw rods, 18. first displaced block, 19. second stepper motors, 20. second grinding screw rods, 21. second displaced block, 22. second vacuum corrugated pipes, 23. head rods, 24. second connecting links.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As depicted in figs. 1 and 2, detection system of the present invention, comprises base 1, base 1 is provided with vacuum chamber 2, first stepper motor 9 and the second stepper motor 19, along the direction from vacuum chamber 2 to the first stepper motor 9, the first vacuum corrugated pipe 8 is provided with successively between first stepper motor 9 and vacuum chamber 2, first displaced block 18 and the first grinding screw rod 17, first vacuum corrugated pipe 8 is connected towards one end of vacuum chamber 2 with vacuum chamber 2, the other end sealing of the first vacuum corrugated pipe 8, the sealed end of the first vacuum corrugated pipe 8 is connected with one end of head rod 23, the other end of head rod 23 stretches in vacuum chamber 2 through the sidewall of the first vacuum corrugated pipe 8 and vacuum chamber 2, and be connected with the displacement sample stage 4 being positioned at vacuum chamber 2, first stepper motor 9 is connected with one end of the first grinding screw rod 17, along the direction from vacuum chamber 2 to the second stepper motor 19, the second vacuum corrugated pipe 22 is provided with successively between vacuum chamber 2 and the second stepper motor 19, second displaced block 21 and the second grinding screw rod 20, second vacuum corrugated pipe 22 is connected towards one end of vacuum chamber 2 with vacuum chamber 2, the other end sealing of the second vacuum corrugated pipe 22, the sealed end of the second vacuum corrugated pipe 22 is connected with one end of the second connecting link 24, the other end of the second connecting link 24 stretches in vacuum chamber 2 through the sidewall of the second vacuum corrugated pipe 22 and vacuum chamber 2 successively, and be connected with the collimating apparatus 6 be vertically arranged in vacuum chamber 2, second stepper motor 19 is connected with one end of the second grinding screw rod 20, the axis of head rod 23 and the axis perpendicular of the second connecting link 24, first stepper motor 9 is all connected with controllor for step-by-step motor with the second stepper motor 19, and this controllor for step-by-step motor is connected with computing machine 10 signal by RS232 serial communication interface COM1.
The bottom surface of vacuum chamber 2 is provided with support 7, support 7 is vertically provided with collimating apparatus 6, collimating apparatus 6 can move back and forth along the axis direction of the second connecting link 24, current probe 5 is provided with in collimating apparatus 6, one end of current probe 5 is stretched in collimating apparatus 6, and towards the workplace of displacement sample stage 4, the other end of current probe 5 stretches out from the upper end of collimating apparatus 6 and is connected with the concentric cable 3 be installed on vacuum chamber 2 lateral wall, and concentric cable 3 is connected with electrometer 11; Electrometer 11 is connected with computing machine 10 signal by RS232 serial communication interface COM2.
Be provided with oil-free scroll vacuum pump 12 and turbomolecular pump 15 in base 1, oil-free scroll vacuum pump 12 is connected by the first push-pull valve 13 with turbomolecular pump 15; Turbomolecular pump 15 is connected with vacuum chamber 2 by the second push-pull valve 14; Second push-pull valve 14 is provided with protective cover 16, and protective cover 16 is positioned at vacuum chamber 2.
Protective cover 16 can prevent foreign matter from falling in turbomolecular pump 15.
By the first stepper motor 9, displacement sample stage 4 is moved back and forth along X-axis, by the second stepper motor 19, collimating apparatus 6 is moved back and forth along Y direction.
Present invention also offers a kind of said detecting system that utilizes to distribute the method detected to metal tritides film target surface tritium, specifically carry out according to the following steps:
Step 1: open vacuum chamber 2, is fixed on displacement sample stage 4 towards on the table top of collimating apparatus 6 by the metal tritides film target sample shown in Fig. 3, close vacuum chamber 2;
Step 2: start oil-free scroll vacuum pump 12, as vacuum tightness≤2Pa in vacuum chamber 2, starts turbomolecular pump 15;
Step 3: vacuum tightness≤1.0 × 10 in vacuum chamber 2
-3during Pa, start-up simulation machine 10, first initialization serial communication interface COM1 and serial communication interface COM2, then sets scanning step, and scanning initial position, carries out zero correction to electrometer 11; Then X-axis control command is sent by serial communication interface COM1 to controllor for step-by-step motor, first stepper motor 9 starts, the first grinding leading screw 17 is driven to rotate, the first grinding screw rod 17 rotated drives the first displaced block 18 to move, and then drive the first vacuum corrugated pipe 8 to move by the first displaced block 18, first vacuum chamber corrugated tube 8 promotes displacement sample stage 4 by head rod 23 and moves in the same way, make displacement sample stage 4 along X-axis step motion, current probe 5 completes X-direction one line scanning of metal tritides film target surface; Computing machine 10 sends Y axle control command by serial communication interface COM1 to controllor for step-by-step motor, second stepper motor 19 starts, second stepper motor 19 drives the second connecting link 24 to move by the second grinding leading screw 20, second displaced block 21 and the second vacuum corrugated pipe 22, drive collimating apparatus 6 along Y-axis step motion, current probe 5 completes Y direction one line scanning of metal tritides film target surface; Then the scanning of X-direction next line is started; In scanning process, computing machine 10 controls by serial communication interface COM2 the current signal that electrometer 11 reads each scanning position of metal tritides film target surface, and save the data in in X-axis and the Y-axis coordinate two-dimensional array that is address, after metal tritides film target surface has all been scanned, the scan-data of preservation has carried out mapping and has obtained the image of metal tritides film target surface tritium distribution by computing machine 10.
Metal tritides film target sample shown in Fig. 3 is placed on the displacement sample stage 4 of detection system of the present invention, this metal tritides film target sample is tritiated titanium target, substrate is molybdenum, the diameter 37mm of substrate, thickness 1mm, molybdenum substrate central authorities are the tritiate titanium film of diameter 20mm, thickness 5 μm, are undertaken testing this metal tritides film target sample by detection method, setting scanning step is 1mm, collimating aperture area 1mm
2, sweep spacing 1 second, the whole target surface of Uniform Scanning, obtains target surface each point (area 1mm
2) β ray flux, test result as shown in Figure 4, Figure 5, Fig. 4 is the 2-d reconstruction figure of tritiated titanium target sample surfaces β ray flux distribution, Fig. 5 is three-dimensional reconstruction figure, because the content of target surface β ray flux and tritium is proportional, so the distribution situation of target surface tritium clearly can be reflected from figure.
The digitized image that the two and three dimensions that existing β autoradiograph method still can not obtain the tritium distribution of metal tritides film target surface is rebuild.
Claims (5)
1. a two-dimensional scan image-forming detecting system for metal tritides film target surface tritium distribution, is characterized in that, comprise base (1), base (1) is provided with vacuum chamber (2) and two stepper motors, vacuum corrugated pipe and driving mechanism is provided with between vacuum chamber (2) and stepper motor, one end of vacuum corrugated pipe is connected with vacuum chamber (2), the other end sealing of vacuum corrugated pipe, the sealed end of vacuum corrugated pipe is connected with one end of connecting link, the other end of connecting link stretches in vacuum chamber (2) through the sidewall of vacuum corrugated pipe and vacuum chamber (2), these two connecting links are mutually vertical, one end that wherein connecting link stretches in vacuum chamber (2) is connected with displacement sample stage (4), another root connecting link is connected with the collimating apparatus (6) be vertically arranged in vacuum chamber (2), current probe (5) is provided with in collimating apparatus (6), one end of current probe (5) is stretched in collimating apparatus (6), and towards the workplace of displacement sample stage (4), the other end of current probe (5) is connected with concentric cable (3), concentric cable (3) is connected with electrometer (11), driving mechanism and vacuum corrugated pipe drive connecting link to move back and forth along own axes direction, two stepper motors are all connected with controllor for step-by-step motor, and this controllor for step-by-step motor is all connected with computing machine (10) signal with electrometer (11), be provided with oil-free scroll vacuum pump (12) and turbomolecular pump (15) in base (1), oil-free scroll vacuum pump (12) is connected by the first push-pull valve (13) with turbomolecular pump (15), turbomolecular pump (15) is connected with vacuum chamber (2) by the second push-pull valve (14).
2. the two-dimensional scan image-forming detecting system of metal tritides film target surface according to claim 1 tritium distribution, it is characterized in that, described driving mechanism comprises displaced block and grinding screw rod, grinding screw rod is by driving stepper motor, displaced block is between grinding screw rod and vacuum corrugated pipe, one end of displaced block is connected with grinding screw rod, and the other end is connected with the sealed end of vacuum corrugated pipe.
3. the two-dimensional scan image-forming detecting system of metal tritides film target surface according to claim 1 tritium distribution, it is characterized in that, the second push-pull valve (14) is provided with protective cover (16), and protective cover (16) is positioned at vacuum chamber (2).
4., by the detection method of detection system described in claim 1 to the tritium distribution of metal tritides film target surface, it is characterized in that, this detection method is specifically carried out according to the following steps:
Step 1: open vacuum chamber (2), is fixed on displacement sample stage (4) towards on the table top of collimating apparatus (6) by metal tritides film target sample, close vacuum chamber (2);
Step 2: start oil-free scroll vacuum pump (12), as vacuum tightness≤2Pa in vacuum chamber (2), starts turbomolecular pump (15);
Step 3: vacuum tightness≤1.0 × 10 in vacuum chamber (2)
-3during Pa, start-up simulation machine (10), initialization serial communication interface, setting scanning step, scanning initial position, carries out zero correction to electrometer (11); Then X-axis control command is sent to controllor for step-by-step motor, a stepper motor starts, this stepper motor promotes displacement sample stage (4) along X-axis step motion by driving mechanism, and current probe (5) completes X-direction one line scanning of metal tritides film target surface; Computing machine (10) sends Y axle control command to controllor for step-by-step motor, another stepper motor starts, this driving stepper motor mechanism drives collimating apparatus (6) along Y-axis step motion by another set of driving mechanism, and current probe (5) completes Y direction one line scanning of metal tritides film target surface; Then the scanning of X-direction next line is started; In scanning process, computing machine (10) reads the current signal of each scanning position of metal tritides film target surface by electrometer (11), and save the data in in X-axis and the Y-axis coordinate two-dimensional array that is address, after metal tritides film target surface has all been scanned, the scan-data of preservation has carried out mapping and has obtained the image of metal tritides film target surface tritium distribution by computing machine (10).
5. the detection method to the tritium distribution of metal tritides film target surface according to claim 4, it is characterized in that, driving mechanism described in step 3 comprises displaced block and grinding screw rod, grinding screw rod is by driving stepper motor, displaced block is between grinding screw rod and vacuum corrugated pipe, one end of displaced block is connected with grinding screw rod, and the other end is connected with the sealed end of vacuum corrugated pipe.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113671221A (en) * | 2021-08-17 | 2021-11-19 | 中国科学院合肥物质科学研究院 | External drive two-dimensional probe system suitable for various plasma vacuum chambers |
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| CN101128731A (en) * | 2004-10-05 | 2008-02-20 | 澳联邦科学与工业研究组织 | Radiographic equipment |
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2015
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| CN101128731A (en) * | 2004-10-05 | 2008-02-20 | 澳联邦科学与工业研究组织 | Radiographic equipment |
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| CN113671221A (en) * | 2021-08-17 | 2021-11-19 | 中国科学院合肥物质科学研究院 | External drive two-dimensional probe system suitable for various plasma vacuum chambers |
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Application publication date: 20150812 |