CN105241909A - Apparatus for positioning inner cavity and surface defects of part through self-finding positron liquid, and method thereof - Google Patents
Apparatus for positioning inner cavity and surface defects of part through self-finding positron liquid, and method thereof Download PDFInfo
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- CN105241909A CN105241909A CN201510645518.5A CN201510645518A CN105241909A CN 105241909 A CN105241909 A CN 105241909A CN 201510645518 A CN201510645518 A CN 201510645518A CN 105241909 A CN105241909 A CN 105241909A
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- 239000007788 liquid Substances 0.000 title claims abstract description 79
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- 238000003384 imaging method Methods 0.000 claims abstract description 29
- 230000008569 process Effects 0.000 claims abstract description 13
- 238000007710 freezing Methods 0.000 claims abstract description 4
- 230000008014 freezing Effects 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 20
- 230000002285 radioactive effect Effects 0.000 claims description 19
- 239000002904 solvent Substances 0.000 claims description 14
- 230000000694 effects Effects 0.000 claims description 11
- 238000009877 rendering Methods 0.000 claims description 6
- 238000001310 location test Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 2
- 238000009835 boiling Methods 0.000 abstract 1
- 238000005086 pumping Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 10
- 238000009659 non-destructive testing Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
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- 239000002253 acid Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- JJWKPURADFRFRB-UHFFFAOYSA-N carbonyl sulfide Chemical compound O=C=S JJWKPURADFRFRB-UHFFFAOYSA-N 0.000 description 1
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- 239000000446 fuel Substances 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000010721 machine oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
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- 238000010998 test method Methods 0.000 description 1
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Abstract
The invention provides an apparatus for positioning inner cavity and surface defects of a part through a self-finding positron liquid, and a method thereof. The inner wall and surface detects of the part are detected and positioned on the basis of a positron annihilation principle and the characteristics of first boiling and then freezing of the liquid in a vacuum pumping process, and positron generation and part complex inner cavity and surface space geometry 3D imaging of radionuclide in the positron liquid in the decaying process without influences of the temperature, the existence state and other factors.
Description
Technical field
The present invention relates to technical field of nondestructive testing, particularly relating to a kind of from seeking formula positron liquid to the defect positioning device of inner cavity of component and surperficial 3D accurately image and method.
Background technology
Antielectron is had as far back as nineteen twenty-eight English physicist DiracPAM prophesy electronics when studying the quantum theory of electronics, American Physical scholar AndersonCD in 1932 has found the existence of positron in the cloud chamber photograph of research cosmic rays, indicates that the mankind begin one's study positron.Have two kinds of positron production methods at present, one is by cyclotron or reactor, utilizes nuclear reaction to generate neutron-deficient radioactive source, as
22na,
64cu,
58co,
18f.Another kind adopts PIPA (bringing out positron) method, utilize energy be tens of MeV linear accelerator produce energetic gamma rays, directly material internal is squeezed into after collimation process, and produce bremsstrahlung with the atomic nucleus of material internal, then produce positron by pair effect.
Nowadays, positron annihilation technique has been generalized to the fields such as chemistry, biology and medical science by people, but up to the present, biologic medical and material microstructure field are only limitted to the research of positron and technological achievement, do not relate to technical field of nondestructive testing, do not relate to part complicated inner cavity and the 3D imaging of space surface geometry and the research of defect location.At present, in industrial part field of non destructive testing, not yet find the actual detection method based on positron annihilation theory or research papers.
Summary of the invention
Goal of the invention: for above-mentioned prior art, proposing a kind of from seeking the device and method of formula positron liquid to inner cavity of component and surface imperfection location, realizing the 3D imaging of part complicated inner cavity and space surface geometry to realize detection and the location of part inwall and surface imperfection.
Technical scheme: a kind of device certainly sought formula positron liquid and locate inner cavity of component and surface imperfection, comprises rigidity closed container, vacuum pump, positron filling system and γ photon detection and imaging device; Described rigidity closed container inside is provided with liftable bracing frame, and part to be measured is placed on described liftable bracing frame; Described positron filling system comprises radionuclide specific activity meter, pipeline and positron liquid reservoir, described positron liquid reservoir connects the positron liquid inlet on rigidity closed container by pipeline, described vacuum pump connects the vacuum orifice on rigidity closed container, and radionuclide specific activity meter is arranged on described pipeline; Described γ photon detection and imaging device are used for carrying out γ photon detection and imaging processing to the part of rigidity closed container.
Based on certainly seeking the defect positioning method of formula positron liquid to inner cavity of component and surface imperfection locating device, comprise the following steps:
Step one, mixes the radioactive nuclide with activity with carrier solvent, prepares positron liquid;
Step 2, is placed in part to be measured on liftable bracing frame in rigidity closed container, and injects described positron liquid, ensures that part is whole and is immersed in positron liquid;
Step 3, vacuumizes process to described rigidity closed container, and shrinks bracing frame at the positron liquid initial stage of freezing, and part is separated with liftable bracing frame, make part when not supporting fully charge in positron liquid;
Step 4, is placed in γ photon detection and imaging device by rigidity closed container, carries out static 2D imaging to part, then reconstructs the 3D rendering of inner cavity of component and space surface geometric configuration, finally by the position of described 3D rendering determination defect.
As preferred version of the present invention, the half life period of described radioactive nuclide is selected to be more than 5 times of defect location test duration.
Beneficial effect: at present, the unique method 3D imaging of industrial part inner chamber and space surface geometry and defect location being carried out to Non-Destructive Testing adopts industry CT, and the method exists very large limitation in reality detects.Adopt and carry out Non-Destructive Testing from seeking formula positron liquid injection method then there is the outstanding technological merit of following several respects:
1, method of testing: industry CT testing process is the asynchronous imaging of plane, and imaging efficiency is low, and the test duration is long; And certainly to seek formula positron liquid injection method testing process be spatial synchronization imaging, imaging efficiency is high, and the test duration is short, good imaging quality; By certainly seeking formula positron liquid injection mode, the characteristic that positron liquid is gaseous state because of it in a vacuum can penetrate into inner cavity of component structure and carry out filling without dead angle to inside parts tube cavity, and when the positron liquid of gaseous state fills whole closed container completely, piece surface can be made to be immersed in completely in the positron liquid of gaseous state.
2, for the specific aim of part labyrinth inner chamber and Surface testing: the part containing labyrinth inner chamber and surface is often used for the power systems such as hydraulic pressure, engine, wheel box, when carrying out Non-Destructive Testing by certainly seeking formula positron liquid injection mode, as long as select suitable radioactive nuclide and carrier solvent, positron liquid directly can carry out real-time 3D imaging to the inner chamber of part and surface, and can realize the location of defect; And the positron detection accuracy that in positron liquid, radioactive nuclide produces is high, can reach nanoscale to the detection size of part inwall and surface imperfection, this lossless detection method also has short, low cost and other advantages detection time simultaneously.Contrast other lossless detection methods, optical microscope and transmission electron microscope cannot detect inner cavity of component; The investigation depth of X ray scattering can reach 1 micron, but does not reach nanoscale to the resolution of flaw size.
3, the radioactive nuclide positron of generation and electronics on part inwall and surface when decaying produces annihilation events, and launch the neutral γ photon pair being mutually 180 °, this is extremely strong to photon penetration capacity, and the aluminium material energy penetrating 200mm thick just decays to 1%.Using this to γ photon as defect information carrier, can not the extraneous factor such as temperature, pressure, electric field, the magnetic field interference of tested person environment, under extremely harsh ambient conditions, part is detected.
4, the radioactive nuclide of positron liquid and its carrier solvent all can customize according to part testing demand targetedly.Synthesize corresponding radioactive nuclide according to actual needs, and by its water-soluble soluble solvent, comprise salt solusion, acid solution, aqueous slkali etc.; Also oil-soluble kind solvent, comprises lubricating oil, machine oil, hydraulic oil, fuel etc.
Accompanying drawing explanation
Fig. 1 be from seek formula positron liquid to inner cavity of component and surface imperfection location device schematic diagram;
Fig. 2 is rigidity closed container structural representation;
Fig. 3 adopts the 3D of solidworks drawing software design to print drawing;
Fig. 4 is for carrying out positron perfusion test gained imaging results to composite block inner chamber.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further explained.
Certainly seek the devices and methods therefor that formula positron liquid is located inner cavity of component and surface imperfection, device comprises rigidity closed container, vacuum pump, positron filling system and γ photon detection and imaging device.Positron filling system comprises radionuclide specific activity meter, pipeline, positron liquid reservoir, airtight discarded object tank.Rigidity closed container inside is provided with the liftable bracing frame for putting part to be measured, and the top of rigidity closed container is provided with positron liquid inlet and vacuum orifice, and the bottom of rigidity closed container is provided with positron liquid escape hole.
As shown in Figure 1, positron liquid reservoir is provided with liquid level gauge, the liquid outlet of positron liquid reservoir connects the positron liquid main-inlet on rigidity closed container by pipeline, this pipeline comprises the filtrator, hydraulic pump, linear voltage regulation valve, tensimeter, the single-pass solenoid valve that connect successively, and radionuclide specific activity meter is arranged on the optional position on this pipeline.The positron liquid escape hole of the bottom of rigidity closed container is connected to airtight discarded object tank by another single-pass solenoid valve.All devices in positron filling system and pipeline are all placed in the vitriol chamber of wall thickness 3 centimetres.Vacuum orifice on rigidity closed container connects vacuum pump.
Based on above-mentioned from seeking the defect positioning method of formula positron liquid to inner cavity of component and surface imperfection locating device, comprise the following steps:
Step one, mixes the radioactive nuclide with activity with carrier solvent, prepares positron liquid.
First this step needs to choose the radioactive nuclide of certain activity, suitable carrier solvent, and positron liquid is the water-soluble or oils positron liquid by proper proportion mixing, and wherein, radioactive nuclide is prepared by medical cyclotron system.The Main Basis of selective emission nucleic kind is the time required for defect location test, selects half life period satisfactory radioactive nuclide according to test duration length.According to practical experience, radionuclide halflife needs for injecting positron liquid, vacuumizes, more than 5 times of the total testing time of detection imaging.
After determining radioactive nuclide, need to select suitable carrier solvent, then by radioisotope labeling in this carrier solvent, generate positron liquid; The standard that carrier solvent is selected is: (1) radioactive nuclide can be dissolved in carrier solvent; (2) radioactive nuclide does not produce chemical reaction with carrier solvent and changes the composition of carrier solvent; (3) the positron liquid generated can not produce chemical reaction and corrosion damage part to be measured with part to be measured.
Step 2, is placed in part to be measured on liftable bracing frame in rigidity closed container, and injects positron liquid, ensures that part is whole and is immersed in positron liquid.
Be specially: first, part to be measured be placed on the liftable bracing frame in rigidity closed container, as shown in Figure 2, this liftable bracing frame have pillar 1 and pillar 2, two pillars are provided with drive unit, can individually control to adjust its height, and now bracing frame is raised configuration.Then, the lid of rigidity closed container is covered airtight after, primer fluid press pump, linear adjustment pressure regulator valve pressure, the single-pass solenoid valve connecting positron liquid main-inlet is in conducting state, and the single-pass solenoid valve of positron liquid escape hole is in closed condition.Now, be perfused in completely in closed container under the pressure that liquid positron liquid can produce at linear pressure regulator valve, adjusted the location status of part by the lifting controlling two pillars respectively in the process of perfusion positron liquid, make positron liquid can pour into the cavity of part completely, good discharge section bubble.When part is immersed in positron liquid completely, close, connect the single-pass solenoid valve of positron liquid main-inlet.
Step 3, positron liquid inject closed container and completely submergence part time, because positron liquid has toughness, thus positron liquid can be made to be attached to piece surface and cavity inner wall, the appearance of bubble can be caused, stop positron liquid note to continue in this kind of defect of such as slit.Vacuum pump is utilized to vacuumize process from the vacuum orifice rigidity closed container to rigidity closed container, when carrying out vacuumizing process, positron liquid can first seethe with excitement, thus get rid of the interference of bubble, then the positron liquid of gaseous state can start to freeze gradually, this process can make slit class defect also have positron liquid to inject, namely realize from seeking formula function, and incorporate lower support frame at the positron liquid initial stage of freezing, final whole part to be measured can when do not have support without dead angle fully charge in positron liquid in positron liquid the decay characteristic of radioactive nuclide can not change because it becomes solid-state by liquid state, still positron can be produced, the experiment interference causing 3D imaging and defect location because of bracing frame is avoided with this, get ready for the formula of certainly seeking realizing part inwall and surface imperfection in later step detects and locates.
Step 4, keeps two single-pass solenoid valves in pipeline to be in closed condition, continues to take out positive vacancy reason by vacuum pump, makes rigidity closed container inside keep vacuum state.Radioactive nuclide launches positron in decay process, positron contact with piece surface to be measured and with electronics generation annihilation events, annihilation can produce the γ photon that the identical but direction of a pair energy is mutually 180 °; Rigidity closed container is placed in γ photon detection and imaging device, detect and record this γ photon, by setting up the mathematical model of rebuilding image pixel and γ photon number relation, computer solves above-mentioned mathematical model, static 2D imaging is carried out to part, then the 3D rendering of inner cavity of component and space surface geometric configuration is reconstructed, finally by the position of 3D rendering determination defect.
Fig. 3 adopts the 3D of solidworks drawing software design to print drawing, wherein 1 is the cylindrical tube of diameter 15mm, long 60mm, and be 15mm with diameter, the long cylindrical tube 2 for 45mm is connected, 3 are screw diameters be 30mm, pitch is the spiral pipe of 20mm, last is 45 ° with pitch angle, right-angle side is that the inclined tube of 10mm is connected.Fig. 4 is that the composite block inner chamber printed this size 3D carries out positron perfusion test gained imaging results.This composite block is that the mode printed by heat fusing stacked 3D is completed, and in material block, have a perimetrical lumen, this tube chamber cannot carry out Non-Destructive Testing by external means.The part that heat fusing stacked 3D prints, small crackle and gap can be produced owing to expanding with heat and contract with cold between layers in accumulation, positron liquid constantly permeates, nucleic probe launches positron constantly and slit surfaces generation annihilation events in decay process, by γ photon detection and imaging device, accurately can locate these gaps, and breakthrough tiny in this composite material parts and percolation zone can be observed.
The present invention by certainly seeking the 3D imaging that formula positron liquid method for implanting carries out part complicated inner cavity and space surface geometry, and can realize detection and the location of part inwall and surface imperfection, has filled up the blank of industrial part Dynamic Non-Destruction Measurement.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1. certainly seek the device that formula positron liquid is located inner cavity of component and surface imperfection, it is characterized in that: comprise rigidity closed container, vacuum pump, positron filling system and γ photon detection and imaging device; Described rigidity closed container inside is provided with liftable bracing frame, and part to be measured is placed on described liftable bracing frame; Described positron filling system comprises radionuclide specific activity meter, pipeline and positron liquid reservoir, described positron liquid reservoir connects the positron liquid inlet on rigidity closed container by pipeline, described vacuum pump connects the vacuum orifice on rigidity closed container, and radionuclide specific activity meter is arranged on described pipeline; Described γ photon detection and imaging device are used for carrying out γ photon detection and imaging processing to the part of rigidity closed container.
2. based on described in claim 1 from seeking the defect positioning method of formula positron liquid to inner cavity of component and surface imperfection locating device, it is characterized in that, comprise the following steps:
Step one, mixes the radioactive nuclide with activity with carrier solvent, prepares positron liquid;
Step 2, is placed in part to be measured on liftable bracing frame in rigidity closed container, and injects described positron liquid, ensures that part is whole and is immersed in positron liquid;
Step 3, vacuumizes process to described rigidity closed container, and shrinks bracing frame at the positron liquid initial stage of freezing, and part is separated with liftable bracing frame, make part when not supporting fully charge in positron liquid;
Step 4, is placed in γ photon detection and imaging device by rigidity closed container, carries out static 2D imaging to part, then reconstructs the 3D rendering of inner cavity of component and space surface geometric configuration, finally by the position of described 3D rendering determination defect.
3. according to claim 2 from seeking the defect positioning method of formula positron liquid to inner cavity of component and surface imperfection locating device, it is characterized in that: select the half life period of described radioactive nuclide to be more than 5 times of defect location test duration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510645518.5A CN105241909B (en) | 2015-10-08 | 2015-10-08 | From the device and method sought formula positive electron liquid and positioned to inner cavity of component and surface defect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510645518.5A CN105241909B (en) | 2015-10-08 | 2015-10-08 | From the device and method sought formula positive electron liquid and positioned to inner cavity of component and surface defect |
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| Publication Number | Publication Date |
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| CN105241909A true CN105241909A (en) | 2016-01-13 |
| CN105241909B CN105241909B (en) | 2018-07-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108167271A (en) * | 2017-11-22 | 2018-06-15 | 南京航空航天大学 | Hydraulic oil bubble and the system and method for hydraulic part leakage are detected using positron annihilation technique |
| CN108760787A (en) * | 2018-04-27 | 2018-11-06 | 南京航空航天大学 | A kind of system and method for realizing airtight cavity internal spraying SHAPE DETECTION and imaging |
| CN109254318A (en) * | 2018-07-23 | 2019-01-22 | 南京航空航天大学 | 3D printing technique on-line real time monitoring method based on positron annihilation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108760787B (en) * | 2018-04-27 | 2020-02-18 | 南京航空航天大学 | System and method for realizing spray shape detection and imaging in closed cavity |
| CN109254318A (en) * | 2018-07-23 | 2019-01-22 | 南京航空航天大学 | 3D printing technique on-line real time monitoring method based on positron annihilation |
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Effective date of registration: 20210926 Address after: 518055 906, block C, building 1, Lot 1, Chuangzhi Yuncheng, Liuxian Avenue, Xili community, Xili street, Nanshan District, Shenzhen, Guangdong Patentee after: Shenzhen Hangyu Photon Detection Technology Co.,Ltd. Address before: 518117 No.127, Shunfeng Road, Liantang Industrial Zone, Pingdong community, Pingdi street, Longgang District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN BE-BETTER TECHNOLOGY INDUSTRIAL Co.,Ltd. |
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Effective date of registration: 20240411 Address after: Room D307, Building G-1, Shazhouhu Science and Technology Innovation Park, Huachang Road, Yangshe Town, Zhangjiagang City, Suzhou City, Jiangsu Province, 215600 Patentee after: Zhangjiagang Aerospace Testing Technology Co.,Ltd. Country or region after: China Address before: 518055 906, block C, building 1, Lot 1, Chuangzhi Yuncheng, Liuxian Avenue, Xili community, Xili street, Nanshan District, Shenzhen, Guangdong Patentee before: Shenzhen Hangyu Photon Detection Technology Co.,Ltd. Country or region before: China |