CN101701922A - Device for carrying out optical non-destructive testing on surface of annular inner wall - Google Patents
Device for carrying out optical non-destructive testing on surface of annular inner wall Download PDFInfo
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- CN101701922A CN101701922A CN200910219057A CN200910219057A CN101701922A CN 101701922 A CN101701922 A CN 101701922A CN 200910219057 A CN200910219057 A CN 200910219057A CN 200910219057 A CN200910219057 A CN 200910219057A CN 101701922 A CN101701922 A CN 101701922A
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- 230000003287 optical Effects 0.000 title claims abstract description 17
- 238000009659 non-destructive testing Methods 0.000 title claims description 22
- 239000011521 glasses Substances 0.000 claims abstract description 33
- 238000010008 shearing Methods 0.000 claims abstract description 16
- 238000003384 imaging method Methods 0.000 claims abstract description 15
- 239000004744 fabrics Substances 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 6
- 230000000875 corresponding Effects 0.000 claims description 5
- CPBQJMYROZQQJC-UHFFFAOYSA-N [Ne].[He] Chemical compound 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Abstract
Description
Technical field
The present invention relates to a kind of device of carrying out optical non-destructive testing on surface of annular inner wall, belong to the optics technical field of nondestructive testing.
Background technology
Numeral speckle-shearing interferometry technology is a kind of whole audience based on laser, the measuring technique of noncontact surface deformation (displacement or strain).Shear mirror with small angle of wedge is placed the front of imaging len, what make body surface a bit produces a pair of two pictures with very little dislocation on image planes, because body surface is by laser lighting, make because two width of cloth clip images of dislocation generation are interfered mutually and formed one and comprise the cutting speckle field of interference pattern at random.Dislocation picture interferes with each other on as the plane, forms the speckle interference image and is collected in the computing machine through image card by CCD, two width of cloth speckle images before and after the distortion is done subtracted each other or related operation promptly can show the speckle striped of deformation of body information on computers in real time.
Numeral speckle-shearing interferometry technology has in real time, the whole audience, noncontact, harmless, mechanism simply, need not advantage such as vibration abatement.Because testing result is not influenced by the testing sample rigid motion, detector need not vibration abatement, provides technical foundation for being applied to the production testing line.Simultaneously, Computer Image Processing and analytic system can be monitored and measure the defective in the sample in real time, and be efficient and convenient.Require to become the basis that digital speckle-shearing interferometry technology maturation is applied to tire, compound substance and metal field to the high precision of measuring samples and to hanging down of measurement environment, it can detect typical defects such as inside tires micro-bubble and carcass separation, and can determine the cross section place of defective.
At present, the image collecting device that lossless detection method and device adopted based on digital cutting speckle principle is area array CCD or face battle array CMOS, for example, Guangzhou SCUT Bestry Auto Co., Ltd's publication number is the patent of invention of CN1632543A, Korea Tyre Co., Ltd's publication number is the patent of invention of CN1916563A, and people such as Y.Y.Hung utilize distortion of speckle interference art Measuring Object and acoplanarity displacement in " the Shearography:An opticalmeasurement technique and applications " that delivered in 2005 on Materials Science and Engineering.In addition, the laser digital cutting speckle tire nondestructive testing instrument that German Steinbichler company produces can detect the whole piece tire, a scan period can finish in 2min, defect resolution is 1mm, and detecting the tire largest outer diameter is 1600mm, and maximum section width is 600mm.But the sensor devices of this detector detection system also is made up of several area array CCDs.
Area array CCD or CMOS area as the speckle pattern recording medium are generally less, and its sum of all pixels is limited.If utilize image device to big view field imaging, the resolution of the cutting speckle picture that area array CCD is gathered can reduce, and then has reduced the detection sensitivity of fault in material.Therefore based on the Non-Destructive Testing of area array CCD, can't reach big visual field area and highly sensitive requirement simultaneously.In addition,, surpass the depth of field restriction of imaging system, and area array CCD is a directrix plane if the detected materials surface undulation is bigger, be imaged on the area array CCD surface picture some can produce the out of focus phenomenon.Because be subjected to the influence of image recording media, the sensitivity of digital speckle-shearing interferometry technology and resolution can not further improve.
Summary of the invention
The technical matters that solves
For fear of the deficiencies in the prior art part, the present invention proposes a kind of device of carrying out optical non-destructive testing on surface of annular inner wall, can design corresponding pushing away according to the testing sample surface topography and sweep track, so that it is clear Jiao to push away the picture of sweeping the testing sample that obtains; Simultaneously, line array CCD is with respect to the area array CCD low price of equal resolution, and the light-sensitive surface size is big, can reduce the detection cost significantly.
Technical scheme
A kind of device of carrying out optical non-destructive testing on surface of annular inner wall is characterized in that comprising laser instrument 1, parallel beam expand device 2, shearing elements 4, imaging device 5, line array CCD 6, universal stage 7, computing machine 8 and thin glass bar 9; On the axis of tested annular inner wall, comply with thin glass bar 9, parallel beam expand device 2, shearing elements 4, imaging device 5, line array CCD 6 and universal stage 7 are set; Shearing elements 4 imaging devices 5 and line array CCD 6 are fixed on the universal stage 7, and the primary optical axis of line array CCD 6 overlaps with turning axle; Thin glass bar 9 is arranged on the annular inner wall axis apart from the position of annular inner wall center less than 200mm, and is parallel to the placement of annular inner wall axis; The optical axis of laser instrument 1 and the central axis of glass bar are 0.01 °～20 ° angles and place; The picture signal that line array CCD 6 is gathered exports computing machine 8 to, and the control signal of computing machine 8 exports the rotation of universal stage 7 control universal stages 7 to; Parallel beam expand device 2 is arranged on laser beam on the circular conical surface beam direction position that thin glass bar produces, and adjustment parallel beam expand device 2 upper-lower positions evenly expand the circular conical surface light beam and restraint the whole surface of annular inner wall; Described shearing elements 4 is that angle is formed at two plane mirrors of 0.01 °～5 ° of fixed angle, and it hands over stupefied being centered close on rotation and the point of crossing, annular inner wall height center, and two minute surfaces are all 45 ° ± 1 ° mutually with the rotation angle.
Described laser instrument 1 adopts helium-neon laser.
Described parallel beam expand device 2 adopts bracelet shape circular column lens.
The line array CCD 6 of band camera lens is the charge-coupled image sensor that one-dimensional array distributes for pixel.
Described thin glass bar 12 diameter ranges are that 5mm is to 10mm.
Thin glass bar adopts optical fiber to replace.
A kind of device that utilizes above-mentioned Non-Destructive Testing annular inner wall surface carries out the method on Non-Destructive Testing annular inner wall surface, it is characterized in that concrete steps are as follows:
Step 1: laser beam is 0.01 °～20 ° angle tilts with the central axis with glass bar throws light on that to form with thin glass bar behind the thin glass bar be the circular conical surface light beam in axle center, this circular conical surface light beam irradiates is on the post lens;
Step 2: this circular conical surface light beam is radiated on the annular inner wall surface after bracelet shape circular column lens expand bundle in the form of a ring, and forms a speckle field at random on the annular inner wall surface;
Step 3: scattered light is reflected after the CCD camera lens becomes the picture of a pair of dislocation on the photosurface of CCD by bimirror, line array CCD to carrying out the continuous sweep collection as the plane, obtains the digital cutting speckle picture at each position, annular inner wall surface under the control of rotation platform;
Step 4: vacuumize in interior sample peripheral region comprising testing sample, repeating step 1 obtains the digital cutting speckle picture that testing sample vacuumizes each position, annular inner wall surface, back to step 3; Relative vacuum degree around the described sample is 0～-100KPa;
Step 5: two width of cloth images before and after vacuumizing are carried out related operation, obtain image H;
Step 6: adopt mean filter method or median filtering method to carry out filtering to image H, remove occur many and obtain image H1 with the line array CCD pixel with wide bright fringes along line array CCD line of pixels column direction;
Step 7: damage appears in the proof testing sample when occurring the interference fringe of butterfly macules shape among the image H1, otherwise the proof testing sample is harmless.
In step 4,, make 1～1000 ℃ of its temperature change, obtain another width of cloth image that corresponding two-beam on the sample heating after image plane becomes two speckle pictures testing sample heating or cooling.
In step 5, two width of cloth images before and after the distortion are carried out additive operation, obtain image H.
Beneficial effect
The device of a kind of carrying out optical non-destructive testing on surface of annular inner wall that the present invention proposes, behind the alternative area array CCD of line array CCD, for solve line array CCD push away sweep obtain speckle as the time image quality issues that occurs, adopted and adopted mean filter method or median filtering method to carry out filtering image, remove to occur many along line array CCD line of pixels column direction with the line array CCD pixel with wide bright fringes, obtain high quality graphic.Thereby, with its processing and synthetic width of cloth two dimension speckle pattern, effectively increased the area of the visual field of writing down again owing to drive line array CCD to the pushing away to sweep to gather as the plane and obtain several one dimension images of sample by micro-displacement platform.And, control to push away and sweep precision by changing step value size that line array CCD pushes away micro-displacement platform in the inswept journey, if the stepping accuracy of described micro-displacement platform is set to the unit pixel size less than line array CCD, can also improve the sampling precision of speckle pattern along the micro-displacement platform moving direction.In addition, when the testing sample surface undulation is big, utilize the picture on the speckle pattern that traditional area array CCD obtains to produce out of focus, can cause to detect corresponding to the defective of out of focus part.And utilize line array CCD to push away the method for sweeping, and can be according to the moving track of the corresponding micro-displacement platform of testing sample surface design, push away along described moving track and to sweep the out of focus phenomenon that the speckle pattern that obtains has been eliminated the speckle picture, thereby effectively improved the sensitivity of defects detection.
Description of drawings
Fig. 1: the principle of device synoptic diagram of carrying out optical non-destructive testing on surface of annular inner wall of the present invention;
Line array CCD, 7-universal stage, 8-computing machine, the thin glass bar of 9-of 1-laser instrument, 2-parallel beam expand device, 3-testing sample, 4-shearing elements, 5-imaging device, 6-band camera lens.
Embodiment
Now in conjunction with the embodiments, accompanying drawing is further described the present invention:
Present embodiment comprises laser instrument 1, parallel beam expand device 2, shearing elements 4, imaging device 5, line array CCD 6, universal stage 7, computing machine 8 and thin glass bar 9.
In the present embodiment, laser instrument adopts helium-neon laser; Testing sample 3 is that the annular inner wall of an object is a tire inner wall; The diameter of thin glass bar 9 is 8mm, and it is arranged on tire axle apart from the position of tire center less than 90mm, and be parallel to tire axle place thin glass bar also available fiber replace; Laser instrument 1 is positioned at thin glass bar one side, becomes 1 ° to 90 ° angle between the light pencil that laser instrument sends and the glass bar axis, and the light beam irradiates glass bar is near the end of tire.Parallel beam expand device 2 adopts bracelet shape circular column lens, and it is arranged on the circular conical surface beam direction that thin glass bar produces, and the circular conical surface light beam evenly can be expanded the whole surface of restrainting annular testing sample.Shearing elements 4 adopts a biplane catoptron of being made up of two plane mirrors, and two plane mirrors fold 1 ° to 5 ° fixed angle, and it hands over stupefied being centered close on the rotation, and two minute surfaces are identical with the rotation angle, near 45 degree.The effect of described biplane catoptron can be divided into a branch of incident light wave two slightly different bundle outgoing light waves of the direction of propagation, and makes the direction of propagation of two outgoing beams vertical with incident light wave; Imaging device 5 adopts the CCD camera lens of an adjustable focal length, is used for inwall blur-free imaging to be measured on the CCD surface; Line array CCD 6 is that a pixel is the charge-coupled image sensor that one-dimensional array distributes, and its line of pixels column direction is identical with the direction that staggers of two outgoing beams that reflected by bimirror 4; Micro-displacement platform 7 adopts rotatable and mobile accuracy can be by the precise rotating platform of computing machine 8 adjustings, and described bimirror, CCD camera lens and CCD are fixed on the accurate universal stage, and the primary optical axis of CCD camera lens overlaps with turning axle.
The groundwork process of present embodiment is: the light beam that described helium-neon laser 1 sends is the thin glass bar 9 of oblique illumination at a certain angle, generation is the circular conical surface light beam in axle center with thin glass bar, this circular conical surface light beam is radiated on the post lens just, this circular conical surface light beam is after bracelet shape circular column lens 2 expand bundle, be radiated on the tire inner wall more equably in the form of a ring, and form a speckle field at random on tire inner wall surface.The scattered light of tire inner wall becomes the picture of a pair of dislocation by bimirror 4 reflections on the photosurface of CCD 6 through CCD camera lens 5.Described accurate rotation platform 7 rotates a circle under computing machine 8 control, and drives 6 pairs of described line array CCDs and carry out the continuous sweep collection as the plane, obtains the digital cutting speckle picture at each position of tire inner wall.Gather two width of cloth cutting speckle figure before and after the distortion of described sample respectively, carry out numerical operation by means such as related algorithm and Digital Image Processing, promptly can obtain the speckle interference fringe pattern of butterfly macules shape by described computing machine 8.
The beneficial effect of present embodiment is: the present embodiment device is specially adapted to detection ring shaped object inside surface, tire inner wall etc. is for example gathered the picture of cutting speckle clearly that can obtain each position of annular inner wall by the CCD rotation of adopting the annular beam illumination and being positioned at universal stage.In the recording process, light source is different with tire, can avoid the speckle field shake, in addition, this device can adopt also that fixedly bimirror and CCD system are motionless, and the mode of rotating tire's and lighting source obtains whole audience speckle pattern synchronously, also can reach the effect of avoiding the speckle field shake.Line array CCD in this device can replace with area array CCD, takes the framing recording mode to obtain whole audience speckle pattern.
Claims (9)
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| CN200910219057A CN101701922A (en) | 2009-11-19 | 2009-11-19 | Device for carrying out optical non-destructive testing on surface of annular inner wall |
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Cited By (10)
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| CN102507595A (en) * | 2011-11-17 | 2012-06-20 | 江苏大学 | Pipeline detection method and device through exciting axial guided waves by utilizing annular laser |
| CN102706886A (en) * | 2012-05-16 | 2012-10-03 | 宁国大通工贸有限公司 | Device for detecting defects at inner part of tire |
| CN105606610A (en) * | 2015-09-09 | 2016-05-25 | 南京农业大学 | Bio-speckle technology based method for nondestructive detection of apple internal quality |
| CN106596556A (en) * | 2016-10-12 | 2017-04-26 | 上海大学 | Container inner wall adhesion quality nondestructive detection method based on shearing speckle interferometry |
| CN106814074A (en) * | 2017-03-22 | 2017-06-09 | 重庆大学 | A kind of cladding nuclear fuels surface defects detection system and method |
| CN107666600A (en) * | 2017-10-19 | 2018-02-06 | 北京数码视讯科技股份有限公司 | The acquisition method of video acquisition device and the application device |
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| CN102507595A (en) * | 2011-11-17 | 2012-06-20 | 江苏大学 | Pipeline detection method and device through exciting axial guided waves by utilizing annular laser |
| CN102706886A (en) * | 2012-05-16 | 2012-10-03 | 宁国大通工贸有限公司 | Device for detecting defects at inner part of tire |
| CN105606610A (en) * | 2015-09-09 | 2016-05-25 | 南京农业大学 | Bio-speckle technology based method for nondestructive detection of apple internal quality |
| CN108885184A (en) * | 2016-04-05 | 2018-11-23 | 倍耐力轮胎股份公司 | For checking the device and method of tire |
| CN106596556A (en) * | 2016-10-12 | 2017-04-26 | 上海大学 | Container inner wall adhesion quality nondestructive detection method based on shearing speckle interferometry |
| CN106814074A (en) * | 2017-03-22 | 2017-06-09 | 重庆大学 | A kind of cladding nuclear fuels surface defects detection system and method |
| CN106814074B (en) * | 2017-03-22 | 2019-05-21 | 重庆大学 | A kind of cladding nuclear fuels surface defects detection system and method |
| CN107666600A (en) * | 2017-10-19 | 2018-02-06 | 北京数码视讯科技股份有限公司 | The acquisition method of video acquisition device and the application device |
| CN107666600B (en) * | 2017-10-19 | 2019-11-08 | 北京数码视讯科技股份有限公司 | The acquisition method of video acquisition device and the application device |
| CN107976155A (en) * | 2017-11-23 | 2018-05-01 | 中国科学技术大学 | A kind of engine air inside wall of cylinder detection device and method based on digital hologram interference |
| CN107976155B (en) * | 2017-11-23 | 2019-10-25 | 中国科学技术大学 | A kind of engine air inside wall of cylinder detection device and method based on digital hologram interference |
| WO2020019348A1 (en) * | 2018-07-27 | 2020-01-30 | 合刃科技（深圳）有限公司 | Device and method for detecting inner wall of microcapillary on basis of coherent light |
| CN109540918A (en) * | 2018-11-28 | 2019-03-29 | 鞍钢集团自动化有限公司 | A kind of hot rolled coil edge fault detection device and method |
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