CN110609314A - Afterglow testing device for scintillator - Google Patents
Afterglow testing device for scintillator Download PDFInfo
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- CN110609314A CN110609314A CN201911042918.1A CN201911042918A CN110609314A CN 110609314 A CN110609314 A CN 110609314A CN 201911042918 A CN201911042918 A CN 201911042918A CN 110609314 A CN110609314 A CN 110609314A
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- sliding block
- platform
- groove
- scintillator
- rocker
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- 238000012360 testing method Methods 0.000 title claims abstract description 63
- 229910052751 metal Inorganic materials 0.000 claims abstract description 62
- 239000002184 metal Substances 0.000 claims abstract description 62
- 230000007246 mechanism Effects 0.000 claims abstract description 15
- 230000005855 radiation Effects 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- XQPRBTXUXXVTKB-UHFFFAOYSA-M caesium iodide Chemical compound [I-].[Cs+] XQPRBTXUXXVTKB-UHFFFAOYSA-M 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Measurement Of Radiation (AREA)
Abstract
The invention provides an afterglow test device of a scintillator, which comprises a platform (1), a turntable (2), a rocker length adjuster (3), a rocker (4), a metal sliding block (5), a rail (6), a ray generator and an afterglow detector, and is characterized in that the turntable (2) and the rail (6) are installed on the platform (1), the rocker length adjuster (3) is used for finely adjusting the length of the rocker (4), a platform through groove (9) is formed in the platform (1), a main test sliding block through groove (7) is formed in the metal sliding block (5), the afterglow detector is used for receiving the afterglow of the scintillator to be tested, and the moving metal sliding block (5) always covers the upper part of the platform through groove when in afterglow test. The afterglow test device of the scintillator adopts the circulating constant-speed rotating connecting rod mechanism to drive the metal sliding block to control the on-off of the ray received by the scintillator to be tested, so that the irradiation of the ray is more uniform and stable, and the afterglow test frequency is improved.
Description
Technical Field
The invention relates to the technical field of ray detection, in particular to an afterglow testing device for a scintillator.
Background
In an X-ray inspection system, the problem of afterglow of a detector based on cesium iodide crystals is serious, and particularly, the detector has a great influence on an image penetration index. In order to improve the performance index of the X-ray inspection system, the afterglow of the detector needs to be tested, and the afterglow is used for screening the detector or afterglow subtraction in image data calculation.
In the prior art, 1) an afterglow testing device generally adopts a belt to drive a metal slide block to simulate the process that X rays are quickly shielded. The metal sliding block is accelerated and started each time, passes through the gap at a set speed at a constant speed in front of the X-ray gap, then stops and automatically returns to the starting position. Photoelectric sensors are arranged in front of and behind the gap for transmitting the X-ray at a certain distance to sense the position of the metal slide block and start and stop the X-ray source. In each test, the metal slide block has a starting and stopping process, and the motion of the metal slide block is not easy to control stably. The X-ray source also has a starting and stopping process, the working efficiency is low, and the dosage received by the afterglow detector at each time has deviation, so that the afterglow test data is inaccurate; 2) chinese patent document CN107861146A discloses an afterglow testing device for scintillators, which uses a rotor to turn on and off the radiation, and the through grooves of the radiation are radially arranged and pass through the center of the rotor. This patent document also finds that if the through groove is a straight groove, the radiation is not immediately turned off due to the rotation of the rotating body, and there is a change in the intensity of the radiation due to a change in thickness. Although this patent document also finds this problem and uses the trumpet-shaped slot to compensate, it still has the defects of complex structure of the rotator, high processing difficulty and difficult alignment control.
Disclosure of Invention
The invention aims to provide an afterglow testing device of a scintillator, which adopts a circulating constant-speed rotating connecting rod mechanism to drive a metal sliding block to control the on-off of the ray received by the scintillator to be tested, so that the irradiation of the ray is more uniform and stable, and the afterglow testing frequency is improved.
The invention relates to a scintillator afterglow test device, which comprises a platform, a turntable, a rocker length adjuster, a rocker, a metal sliding block, a track, a ray generator and an afterglow detector,
the turntable and the track are arranged on the platform, the rotating shaft of the turntable is vertical to the platform, one end of the rocker is hinged at the circumferential edge of the turntable, the other end of the rocker is hinged at the side surface of the metal sliding block, the lower surface of the metal sliding block is provided with a sliding groove matched with the track, the metal sliding block can slide along the track, the turntable, the rocker and the metal sliding block form a centering crank sliding block mechanism,
the rocker length adjuster is used for finely adjusting the length of the rocker,
the platform is provided with a platform through groove, the scintillator to be tested is arranged right below the platform through groove, the ray generator is arranged right above the platform through groove, rays emitted by the ray generator can penetrate through the platform through groove to irradiate on the scintillator to be tested,
the metal slide block is provided with a main test slide block through groove, when the metal slide block moves to the middle position of the slide block of the crank slide block mechanism, the main test slide block through groove is positioned right above the platform through groove, so that rays emitted by the ray generator can sequentially pass through the main test slide block through groove and the platform through groove to irradiate on a scintillator to be tested,
the afterglow detector is used for receiving the afterglow of the scintillator to be detected,
when the afterglow test is carried out, the metal slide block in motion always covers the through groove of the platform.
Furthermore, a plurality of parallel auxiliary test slider through grooves are symmetrically and uniformly distributed on two sides of the main test slider through groove on the metal slider, and if the main test slider through groove is only used for testing, the auxiliary test slider through groove is sealed by a lead block.
Furthermore, the rocker length adjuster is provided with an upper opening and a lower opening, internal threads with opposite rotation directions are respectively arranged in the upper opening and the lower opening, the rocker is divided into an upper section and a lower section, one end of the lower section is hinged to the edge of the circumference of the turntable, the other end of the lower section is provided with external threads and screwed into the lower opening of the rocker length adjuster, one end of the upper section is provided with external threads and screwed into the upper opening of the rocker length adjuster, and the other end of the upper section is hinged to the side face of the metal sliding block.
Furthermore, copper blocks or aluminum blocks with different thicknesses can be placed in the main test slider through groove or the auxiliary test slider through groove, and the intensity of rays irradiated on the tested scintillator is adjusted.
Furthermore, the turntable also comprises a motor, and the turntable rotates at a constant speed under the driving of the motor.
The afterglow test device of the scintillator has the advantages that 1) the afterglow test device of the scintillator has the advantages that the circulating constant-speed rotating connecting rod mechanism drives the metal sliding block to control the on-off of the radiation received by the scintillator to be tested, the metal sliding block is provided with the long groove for passing through the radiation, the dose of the passing radiation is more stable, and the on-off is more rapid and uniform; 2) the connecting rod mechanism for driving the sliding block is a centering crank sliding block mechanism, and a rotating disc serving as a crank rotates at a constant speed under the driving of a motor, so that the motion stability of the metal sliding block can be ensured; 3) the main testing slide block through groove on the metal slide block is positioned in the positive direction of the platform through groove in the middle position of the motion of the slide block, so that the dosage of rays irradiating the tested scintillator is maximum, the speed of the slide block is the maximum value at the position, the acceleration is 0, and the on-off of the rays is most stable; 4) a rocker of the crank sliding block mechanism is provided with a length fine adjustment device, so that the position relation between the sliding block through groove and the platform through groove can be accurately adjusted, and the accuracy of afterglow test is improved; 5) the metal sliding block is also provided with a plurality of auxiliary testing sliding block through grooves, and the afterglow measuring times are increased by matching with the rotating speed of the turntable; 6) copper blocks or aluminum blocks with different thicknesses can be placed in the through grooves of the sliding blocks and used for adjusting the intensity of rays irradiated on the scintillator to be detected.
Drawings
Fig. 1 is a schematic structural view of an afterglow test apparatus of a scintillator according to the present invention.
In the figure, 1 platform, 2 turntables, 3 rocker length adjusters, 4 rockers, 5 metal sliders, 6 tracks, 7 main test slider through grooves, 8 auxiliary test slider through grooves and 9 platform through grooves.
Detailed Description
The following describes the present invention with reference to the attached drawings.
As shown in the attached figure 1, the afterglow test device of the scintillator comprises a platform 1, a turntable 2, a rocker length adjuster 3, a rocker 4, a metal sliding block 5, a track 6, a ray generator, an afterglow detector and a motor.
The turntable 2 and the track 6 are arranged on the platform 1, the rotating shaft of the turntable 2 is vertical to the platform 1, and the turntable 2 rotates at a constant speed under the driving of the motor. One end of the rocker 4 is hinged to the circumferential edge of the turntable 2, the other end of the rocker 4 is hinged to the side face of the metal sliding block 5, a sliding groove matched with the rail is formed in the lower surface of the metal sliding block 5, the metal sliding block 5 can slide along the rail 6, and the turntable 2, the rocker 4 and the metal sliding block 5 form a centering type crank sliding block mechanism. When the turntable rotates at a constant speed, the metal slide block 5 can move more stably by adopting the centering type crank slide block mechanism.
The rocker length adjuster 3 is used for finely adjusting the length of the rocker 4. The rocker length adjuster 3 is provided with an upper opening and a lower opening, internal threads with opposite screwing directions are respectively arranged in the upper opening and the lower opening, the rocker 4 is divided into an upper section and a lower section, one end of the lower section is hinged to the edge of the circumference of the turntable 2, the other end of the lower section is provided with external threads and is screwed into the lower opening of the rocker length adjuster 3, one end of the upper section is provided with the external threads and is screwed into the upper opening of the rocker length adjuster 3, and the other end of the upper section is hinged to the side face of the metal sliding block 5.
Platform 1 on open and to have the platform to lead to groove 9, the scintillator of being surveyed is placed under the platform leads to groove 9, ray generator install directly over the platform leads to groove 9, the ray that ray generator sent can pass through the platform and lead to groove 9 and shine on the scintillator of being surveyed.
The metal sliding block 5 is provided with a main testing sliding block through groove 7, when the metal sliding block 5 moves to the middle position of a sliding block of the slider-crank mechanism, the main testing sliding block through groove 7 is positioned right above the platform through groove, and rays emitted by the ray generator sequentially pass through the main testing sliding block through groove 7 and the platform through groove 9 to irradiate on a measured scintillator. At this time, the speed of the metal slider 5 is the maximum value, and the acceleration thereof is 0, so that the on-off of the ray can be the most stable. In order to enable the metal sliding block 5 to be positioned in the middle of the movement of the crank sliding block mechanism, the main testing sliding block through groove 7 is just positioned right above the platform through groove 9, and the length adjuster 3 of the fine-adjustable rocker is realized.
And a plurality of parallel auxiliary test slider through grooves 8 are symmetrically and uniformly distributed on two sides of the main test slider through groove 7 on the metal slider 5, and if the test is carried out only by using the main test slider through groove 7, the auxiliary test slider through groove 8 is sealed by using a lead block. Copper blocks or aluminum blocks with different thicknesses can be placed in the main test slider through groove 7 or the auxiliary test slider through groove 8 and are used for adjusting the intensity of rays irradiated on the scintillator to be tested.
The afterglow detector is used for receiving the afterglow of the scintillator to be detected.
When the afterglow test is carried out, the metal slide block 5 in motion always covers the through groove of the platform.
The movement of the mechanism of the embodiment of the testing device is analyzed, and the distance from the rotating shaft center of the turntable 2 to the fixed point of the rocker 4 is a. When the metal sliding block 5 is positioned at the uppermost position, the axis of the rotary table 2, the connection point of the rotary table 2 and the rocker 4, and the connection point of the rocker 4 and the metal sliding block 5 are on the same straight line. When the metal sliding block 5 is at the uppermost limit position, the lower edge just shields the through groove 9 of the platform. The width of the platform through slot 9 is δ, which is a size that ensures that the transmitted X-ray covers the width of the detector, and δ is much smaller than a. The width of the metal slider 5 is b, and b is greater than 2 a. N sliding block through grooves parallel to the platform through groove 9 are formed in the width of the metal sliding block 5 a, and the distance f is formed between the gaps.
A plurality of slider through grooves formed in the metal slider 5 can be blocked by metal plates, and the thickness of the metal plates can be selected. The ray generator is an X-ray source and is positioned vertically above the platform through groove 9, and the rays cover the length of the whole platform through groove 9. The turntable 2 rotates at a constant angular velocity ω. When the X-ray source continuously emits rays, N sliding block through grooves just coincide with the platform through groove 9 in sequence in the process that the rotary table 2 rotates from the N point to the P point and then to the Q point, and the X-rays penetrate through the sliding block through grooves. When the turntable 2 continues to turn from the point Q to the point M and returns to the point N, the through grooves of the N sliding blocks are sequentially overlapped with the through grooves 9 of the platform, and the X-rays are transmitted. During one revolution of the turntable 2, X-rays are transmitted 2n times. Copper or aluminum metal plates with different thicknesses are additionally covered on different through grooves of the sliding block, so that the transmitted X-ray intensities are different, and the afterglow condition under different X-ray intensities can be obtained.
The rotating disk 2 rotates just 90 degrees from the point N to the point P, and the metal slide 5 moves by the following distance:then when h is 2 a: s ═ 1.268 a; when h is 3 a: s ═ 1.172 a; when h is 4 a: and S is 1.127 a.
It can be seen that when the hinge point of the rocker 4 on the turntable 2 is rotated by 90 ° from the illustrated vertex, the metal slider 5 moves a distance greater than a, and as the length of the rocker 4 increases, the distance decreases and approaches a; and the moving speed of the metal slider 5 approaches a omega from being larger than a omega. Therefore, the length of the rocker length adjuster 3 of the rocker 4 can be adjusted, the speed of the reciprocating process of the metal sliding block 5 can be changed, and the position of the metal sliding block 5 can be accurately adjusted.
Although the present invention has been described in terms of the preferred embodiment, it is not intended that the invention be limited to the embodiment. Any equivalent changes or modifications made without departing from the spirit and scope of the present invention also belong to the protection scope of the present invention. The scope of the invention should therefore be determined with reference to the appended claims.
Claims (5)
1. An afterglow test device of a scintillator, which comprises a platform (1), a turntable (2), a rocker length adjuster (3), a rocker (4), a metal sliding block (5), a track (6), a ray generator and an afterglow detector, and is characterized in that,
the turntable (2) and the track (6) are installed on the platform (1), the rotating shaft of the turntable (2) is perpendicular to the platform (1), one end of the rocker (4) is hinged at the circumferential edge of the turntable (2), the other end of the rocker (4) is hinged at the side surface of the metal sliding block (5), the lower surface of the metal sliding block (5) is provided with a sliding groove matched with the track, the metal sliding block (5) can slide along the track (6), and the turntable (2), the rocker (4) and the metal sliding block (5) form a centering crank sliding block mechanism,
the rocker length adjuster (3) is used for finely adjusting the length of the rocker (4),
a platform through groove (9) is formed in the platform (1), a scintillator to be detected is placed under the platform through groove (9), the ray generator is installed right above the platform through groove (9), rays emitted by the ray generator can penetrate through the platform through groove (9) to irradiate on the scintillator to be detected,
the metal sliding block (5) is provided with a main testing sliding block through groove (7), when the metal sliding block (5) moves to the middle position of the sliding block of the crank sliding block mechanism, the main testing sliding block through groove (7) is positioned right above the platform through groove, so that rays emitted by the ray generator can sequentially pass through the main testing sliding block through groove (7) and the platform through groove (9) to irradiate on a scintillator to be tested,
the afterglow detector is used for receiving the afterglow of the scintillator to be detected,
when the afterglow test is carried out, the metal slide block (5) in motion always covers the through groove of the platform.
2. An afterglow tester for a scintillator as claimed in claim 1, wherein said main testing slider through slot (7) of said metal slider (5) is further symmetrically and uniformly provided with a plurality of parallel auxiliary testing slider through slots (8), if only the main testing slider through slot (7) is used for testing, the auxiliary testing slider through slot (8) is closed by lead block.
3. The afterglow test device of a scintillator according to claim 2, wherein the rocker length adjuster (3) has an upper opening and a lower opening, the upper opening and the lower opening have internal threads with opposite turning directions, respectively, the rocker (4) is divided into an upper section and a lower section, one end of the lower section is hinged at the circumferential edge of the turntable (2), the other end of the lower section has external threads and is screwed into the lower opening of the rocker length adjuster (3), one end of the upper section has external threads and is screwed into the upper opening of the rocker length adjuster (3), and the other end of the upper section is hinged at the side of the metal sliding block (5).
4. An afterglow test device for scintillator as claimed in claim 3, wherein said main test slider channel (7) or sub test slider channel (8) can be put in copper blocks or aluminum blocks with different thickness for adjusting the radiation intensity to the scintillator to be tested.
5. An afterglow test device for a scintillator as claimed in claim 3, further comprising a motor, wherein said rotating disc (2) is driven by the motor to rotate at a constant speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911042918.1A CN110609314A (en) | 2019-10-30 | 2019-10-30 | Afterglow testing device for scintillator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911042918.1A CN110609314A (en) | 2019-10-30 | 2019-10-30 | Afterglow testing device for scintillator |
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| CN110609314A true CN110609314A (en) | 2019-12-24 |
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| CN201911042918.1A Pending CN110609314A (en) | 2019-10-30 | 2019-10-30 | Afterglow testing device for scintillator |
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