CN100399595C - Wheeled scanning proe for scanning imager - Google Patents
Wheeled scanning proe for scanning imager Download PDFInfo
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- CN100399595C CN100399595C CNB031195814A CN03119581A CN100399595C CN 100399595 C CN100399595 C CN 100399595C CN B031195814 A CNB031195814 A CN B031195814A CN 03119581 A CN03119581 A CN 03119581A CN 100399595 C CN100399595 C CN 100399595C
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Abstract
The present invention discloses a wheeled scan probe which is used for scanned imagery. The probe comprises a cylindrical supporter and a hollow wheel shaft which is nested in the cylinder, transducer units are equidistantly distributed on the outer surface of the supporter, and each transducer unit is provided with two extraction electrodes along the inner surface of the supporter along the radial direction of the supporter. The wheel shaft is provided with two electrode slide blocks which are in electric brush type connection with the two extraction electrodes respectively through electrode pressure springs; the two electrode slide blocks are respectively provided with an electrode lead wire which is led out of the wheel shaft through the hollow part of the wheel shaft; each transducer unit is composed of piezoelectric blocks and non-piezoelectric blocks, which are alternately arranged, the upper surface and the lower surface of each transducer unit are respectively coated with an upper electrode and a lower electrode, and the upper electrode and the lower electrode are respectively connected with the two extraction electrodes which are corresponding to the transducer unit. The present invention provides the wheeled scan probe which can be used for a scanning imaging device, the wheeled scan probe can be used for the ultrasonic non-destructive detection of solid materials, and the non-destructive detection comprises the quality evaluation of adhesive interfaces.
Description
Technical field
The present invention relates to a kind of probe that is used for scanned imagery device, specifically, relate to a kind of wheeled scanning head that is used for scanned imagery device.
Background technology
Traditional multi channel imaging technology utilizes the ultrasonic longitudinal wave probe to form the normal probe array or the wheel seach unit array carries out the electronic scanning imaging to detected object.Because have the wave mode conversion in solid, traditional compressional wave phased-array technique can run into extra interference when the detection that is used for solid dielectric.In addition, in the detection of the liquid interlayer of bonding interface and zero clearance unsticking, adopt ultrasonic longitudinal wave to detect.
With respect to compressional wave, shear wave is surveyed its special advantages.From communication theory as can be known, more simple for scattering, the reflection characteristic of the pure shear waves of complex dielectrics material such as anisotropy, adopt shear wave to detect to have the compressional wave effect that is beyond one's reach.Under identical frequency condition, it is little one times that shear wave wavelength ratio compressional wave wavelength is almost wanted, and therefore to onesize defective, what the reflected energy of shear wave relatively also will be big is many.Simultaneously, in the detection of liquid interlayer, the sensitivity of shear wave is also more than the compressional wave height in to the bonding interface defective.
Though in the ultrasound detection of weld seam, sometimes use shear wave array probe (Roy, O.Mahaut, S.Casula, O.Development of a smart flexible transducer to inspect component ofcomplex geometry:modeling and experiment, AIP Conference Proceedingsno.615A:908-14,2002), but, the array element direct radiation compressional wave of forming linear transducer array, oblique incidence utilizes the wave mode conversion to produce shear wave in detecting medium on coupled interface then.This wave mode switch technology of utilizing, the efficient that produces shear wave is affected, and often with compressional wave or surface wave its detection is affected.Also there is the electromagnetic sound of use technology to produce the SH shear wave and carries out the metallic plate thickness measuring
[2], but equipment is relatively complicated, and testing conditions requires high, and only is applicable to ferromagnetic media, does not yet have the actual product that can be used for little equivalent defect detection at present.Use additive method also can produce shear wave ([1] .Murray, P.R.Dewhurst, R.J.Laser/EMAT measurement systems for ultrasound B-scan imaging, Sensors and theirApplications XI.Proceedings of the Eleventh Conference on Sensors and theirApplications:169-74,2001; [2] .Every, A.G.Sachse, W.Imaging of laser-generatedultrasonic waves in silicon, Physical Review B (Condensed Matter), vol.44, no.13:6689-99,1 Oct.1991Language:English; [3]. Wang Chenghao, Qiao Donghai, the research of the sound beam focusing that surface of solids Fresnel array produces, acoustic journal, Vol.24, No.4,1999, pp351-356), but also often follow compressional wave, the shear wave radiated sound field that the pattern that can not obtain is pure.
Summary of the invention
The objective of the invention is directly to launch shear wave for the probe that overcomes scanned imagery device in the prior art, thereby efficient is low and limit shortcomings such as its application, can directly produce the transducer unit of shear wave by design, thereby a kind of wheeled scanning head that is used for scanned imagery device is provided.
Technical scheme of the present invention is:
A kind of wheeled scanning head that is used for scanned imagery device, this probe comprise a cylindric supporter 1 and are nested in the interior hollow wheel shaft 7 of tube; Supporter 1 outer surface equidistantly is embedded with transducer unit 2, and transducer unit 2 is cuboid, the parallel axes of its length direction and supporter 1; Transducer unit 2 is provided with two extraction electrodes 8 along the inner surface of the radially pairing supporter 1 of supporter 1; Wheel shaft 7 is provided with two electrode slide blocks 9, and is connected with two extraction electrode 8 electric brush types by electrode stage clip 10 respectively; Two electrode slide blocks 9 respectively have a contact conductor 11 to be drawn out to wheel shaft 7 outsides by the hollow space of wheel shaft 7; Described transducer unit 2 is made up of piezoelectric blocks 3 and non-piezoelectric blocks 4; Described piezoelectric blocks 3 and non-piezoelectric blocks 4 are staggeredly placed; The upper and lower surface of transducer unit 2 is coated with top electrode 5 and bottom electrode 6 respectively, and corresponding with this transducer unit 2 respectively two extraction electrodes 8 connect.
Adopt bearing class or direct friction formula connected mode between described supporter 1 and the wheel shaft 7.The width of described transducer unit 2 is smaller or equal to λ/2, and its thickness is smaller or equal to λ/2, and wherein λ equals the wavelength of required emission sound wave.Distance between the adjacent transducer unit 2 is more than or equal to isolating the minimum range that coupled vibrations needs between transducer unit.The polarization direction of described piezoelectric blocks 3 is along the length direction or the Width of transducer unit 2.This probe also comprises the diaphragm that is arranged on the described transducer unit 2 acoustic radiation faces, is arranged on the backing on described transducer unit 2 back sides.
When reality is used, wheeled scanning head provided by the invention partly can be connected by multi beam radioshielding cable with the emission/receiving circuit of the scanned imagery device of prior art, thereby constitute complete multichannel scanned imagery device.
The advantage that is used for the wheeled scanning head of scanned imagery device provided by the invention is: this probe can directly produce pure shear wave, and the influence that the acoustic modes conversion brings in the solid has been avoided in energy loss or other interference of having avoided the wave mode conversion to bring; Use this probe, not only can utilize the vertical pure shear wave acoustic beam electronic scanning of electronics phase control techniques realization, also can the liquid interlayer and the zero clearance unsticking of bonding interface be detected solid material.
The wheeled scanning head that is used for scanned imagery device provided by the invention can be used for the Ultrasonic NDT of solid material, comprising the quality evaluation of bonding interface.
Description of drawings
Fig. 1 (a) is the front view of the wheeled scanning head of the present invention;
Fig. 1 (b) is the end view of the wheeled scanning head of the present invention;
Fig. 2 is the structural representation of transducer unit among Fig. 1;
Fig. 3 is the structural representation of another kind of transducer unit
Fig. 4 is a structural representation of using the scanned imagery device mechanical part of the wheeled scanning head of the present invention;
Fig. 5 is a structural representation of using the scanned imagery device electronic section of the wheeled scanning head of the present invention;
The drawing explanation:
Supporter 1 transducer unit 2 piezoelectric blocks 3 non-piezoelectric blocks 4
Electrode slide block 9 electrode stage clips 10 contact conductors 11
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:
Fig. 1 is the structural representation of wheeled scanning head, and Fig. 1 (a) is a front view, and Fig. 1 (b) is an end view.This probe comprises the cylindric supporter 1 that an epoxide resin material is made on the whole and is nested in the interior hollow wheel shaft 7 of tube, adopts bearing class or direct friction formula connected mode between them.Supporter one week of 1 outer surface equidistantly is embedded with a plurality of transducer units 2, and the spacing between the adjacent transducer is 2 millimeters.Transducer unit 2 is cuboid, the parallel axes of its length direction and supporter 1.All corresponding two extraction electrodes 8 of each transducer unit 2, extraction electrode 8 is positioned at the inner surface of supporter 1, and is in the same radial direction of supporter 1 with corresponding transducer unit 2.Wheel shaft 7 is provided with two electrode slide blocks 9, and is connected with two extraction electrode 8 electric brush types by electrode stage clip 10 respectively; Two electrode slide blocks 9 respectively have a contact conductor 11 to be drawn out to wheel shaft 7 outsides by the hollow space of wheel shaft 7.
A kind of structure of transducer unit 2 as shown in Figure 2, its width is 0.8 millimeter, thickness is 1.1 millimeters, length is 10 millimeters, the wavelength of this transducer unit 2 emission sound waves is 3 millimeters (they are the situation of metallic steel corresponding to detection bodies).Transducer unit 2 upper and lower surfaces are coated with top electrode 5 and bottom electrode 6 respectively, and these two electrodes are used for respectively two extraction electrodes 8 corresponding with this transducer unit 2 and connect.Transducer unit 2 is staggeredly placed by 3 piezoelectric blocks 3 and 4 non-piezoelectric blocks 4 and forms, and its polarization direction is along the length direction of transducer unit 2; Piezoelectric blocks 3 uses piezoelectric, can be lead titanate piezoelectric ceramics, as PZT-5A and PZT-4, and also available other serial piezoelectric such as barium titanate, lead meta-columbute, potassium-sodium niobate, lead titanate piezoelectric ceramics or quartz crystal.The material of non-piezoelectric blocks is epoxy resin such as E-51, or other bisphenol A type epoxy resin such as E-44 or E-55.
It is the diaphragm (not shown) that epoxy resin adds 280 order diamond dust that the acoustic radiation face of transducer unit 2 is provided with material, and wherein, diamond dust also insulating material micro mist such as available silicon Barbiturates micro mist or corundum class micro mist replaces.The back side of transducer unit 2 is provided with the backing (not shown) that epoxy resin adds metal dust, for example adds tungsten powder.
Use the scanned imagery device of wheeled scanning head of the present invention, comprise electronic section and mechanical part.Mechanical part as shown in Figure 4, electronic section is as shown in Figure 5.The wheel seach unit sweep mechanism that wheeled scanning head constitutes with scanning support.Scanning support is made up of supporting guide, scanning support pedestal, stepping motor, cable joint.The scanning support pedestal is installed on the supporting guide, can move along track under the driving of stepping motor.Wheeled scanning head is installed in the below of pedestal, and scanning support applies certain compressive load can for wheeled scanning head.Cable joint will couple together with electronic section emission/receiving circuit, scan control drive circuit respectively from the contact conductor 11 of wheeled scanning head, the driving/control line of stepping motor, and wherein contact conductor 11 uses the high frequency coaxial shielded type cable.
Electronic section comprises radiating circuit, receiving circuit, A/D change-over circuit, industrial control computer, display, printer.Scanning system comprises scan control drive circuit and scanning driving device.Industrial control computer is responsible for the work such as control, waveform processing, identification, classification and imaging of equipment.Radiating circuit is responsible for producing the high-voltage pulse signal of drive pressure electric transducer, common transmitted pulse amplitude 〉=200 volts, rising edge/trailing edge≤10 nanoseconds.Receiving circuit be responsible for will receive signal amplify, and deliver to the A/D change-over circuit, amplifier bandwidth 〉=15 megahertzes in the receiving circuit gain 〉=64 decibels usually, gain control range 〉=74 decibel.A/D change-over circuit employing waveform acquisition card, use is not less than 20 MHz sample frequencies collection echo-signal and leaves in the dual-ported memory, at last the Wave data of gathering is given industrial control computer for processing, demonstration.Display is used for implementing real time monitoring and showing imaging results to device systems implementation menu mode operation with to the echo-signal waveform.Printer is finished the printout imaging results and the function of related parameter is arranged.
When beginning to scan, the transducer unit that is connected with the electrode slide block on the cylindrical shell is positioned under the cylindrical shell and on the surface of the work, other unit then are in off-state.This moment, radiating circuit sent the excitation electric pulse, and transducer unit is the radiation shear wave in workpiece.After receiving circuit was received echo from workpiece, scan control circuit sent scanning and carries out signal, and scan drive circuit driven sweep frame moves forward, and cylindrical shell is rolled to next transducer unit, entered new scanning and detected circulation.Therefore, among the present invention, sweep speed should be enough little, fully to make the transducer unit of each work can receive the flaw echo farthest that may exist in the workpiece.
Need smear shear wave couplant such as thickness honey etc. at surface of the work in the testing process, and apply certain coupling pressure load, so filler of roller shaft and tubular supporter, supporting guide, scanning support etc. all should select for use suitable material to make it have certain intensity.
In the scanning process of Fig. 4, the physical scan area that is realized is the rectangular scanning zone that series of parallel is arranged, and these zones have provided the minimum dimension of the not omission defective that the scanning coverage rate when using device of the present invention to carry out scanning imagery maybe can reach.
Claims (7)
1. wheeled scanning head that is used for scanned imagery device, this probe comprise a cylindric supporter (1) and are nested in a hollow wheel shaft (7) in the tube; It is characterized in that supporter (1) outer surface equidistantly is embedded with transducer unit (2), transducer unit (2) is cuboid, the parallel axes of its length direction and supporter (1); Transducer unit (2) is provided with two extraction electrodes (8) along the inner surface of the radially pairing supporter of supporter (1) (1); Wheel shaft (7) is provided with two electrode slide blocks (9), and is connected with two extraction electrodes (8) electric brush type by electrode stage clip (10) respectively; Two electrode slide blocks (9) respectively have a contact conductor (11) to be drawn out to wheel shaft (7) outside by the hollow space of wheel shaft (7); Described transducer unit (2) is made up of piezoelectric blocks (3) and non-piezoelectric blocks (4); Described piezoelectric blocks (3) and non-piezoelectric blocks (4) are staggeredly placed; The upper and lower surface of transducer unit (2) is coated with top electrode (5) and bottom electrode (6) respectively, and corresponding with this transducer unit (2) respectively two extraction electrodes (8) connect.
2. the wheeled scanning head that is used for scanned imagery device according to claim 1 is characterized in that, adopts bearing class or direct friction formula connected mode between described supporter (1) and the wheel shaft (7).
3. the wheeled scanning head that is used for scanned imagery device according to claim 1 is characterized in that, the width of described transducer unit (2) is smaller or equal to λ/2, and its thickness is smaller or equal to λ/2, and wherein λ equals the wavelength of required emission sound wave.
4. the wheeled scanning head that is used for scanned imagery device according to claim 1 is characterized in that, the distance between adjacent transducer unit (2) is more than or equal to isolating the minimum range that coupled vibrations needs between transducer unit.
5. the wheeled scanning head that is used for scanned imagery device according to claim 1 is characterized in that the polarization direction of described piezoelectric blocks (3) is along the length direction or the Width of transducer unit (2).
6. the wheeled scanning head that is used for scanned imagery device according to claim 1 is characterized in that, also comprises the diaphragm that is arranged on described transducer unit (2) the acoustic radiation face.
7. the wheeled scanning head that is used for scanned imagery device according to claim 1 is characterized in that, also comprises the backing that is arranged on described transducer unit (2) back side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031195814A CN100399595C (en) | 2003-03-12 | 2003-03-12 | Wheeled scanning proe for scanning imager |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031195814A CN100399595C (en) | 2003-03-12 | 2003-03-12 | Wheeled scanning proe for scanning imager |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1530649A CN1530649A (en) | 2004-09-22 |
| CN100399595C true CN100399595C (en) | 2008-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB031195814A Expired - Fee Related CN100399595C (en) | 2003-03-12 | 2003-03-12 | Wheeled scanning proe for scanning imager |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101143591B (en) * | 2007-10-19 | 2012-01-11 | 上海铁路局 | Combined wheel set detecting device for reversible wheel array probe |
| CN101894592B (en) * | 2010-06-23 | 2012-07-11 | 中广核检测技术有限公司 | Front-end probe mechanism of reactor pressure vessel checking machine |
| CN107014907B (en) * | 2017-04-10 | 2023-05-26 | 中国科学院声学研究所 | Flexible probe structure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2208138A (en) * | 1987-06-19 | 1989-03-01 | Circulation Res Ltd | Ultrasonic transducer array around a flexible tube |
| JPH02107236A (en) * | 1988-10-18 | 1990-04-19 | Yokogawa Medical Syst Ltd | Probe for ultrasonic diagnosis |
| US5250869A (en) * | 1990-03-14 | 1993-10-05 | Fujitsu Limited | Ultrasonic transducer |
| CN1224840A (en) * | 1997-11-11 | 1999-08-04 | 通用电器横河医疗***株式会社 | Method of manufacturing ultrasonic probe, ultrasonic probe and ultrasonic imaging apparatus |
| JP2003070096A (en) * | 2001-01-25 | 2003-03-07 | Matsushita Electric Ind Co Ltd | Compound piezoelectric material, ultrasonic probe for ultrasonic diagnostic device, the ultrasonic diagnostic device, and manufacturing method for composite piezoelectric body |
-
2003
- 2003-03-12 CN CNB031195814A patent/CN100399595C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2208138A (en) * | 1987-06-19 | 1989-03-01 | Circulation Res Ltd | Ultrasonic transducer array around a flexible tube |
| JPH02107236A (en) * | 1988-10-18 | 1990-04-19 | Yokogawa Medical Syst Ltd | Probe for ultrasonic diagnosis |
| US5250869A (en) * | 1990-03-14 | 1993-10-05 | Fujitsu Limited | Ultrasonic transducer |
| CN1224840A (en) * | 1997-11-11 | 1999-08-04 | 通用电器横河医疗***株式会社 | Method of manufacturing ultrasonic probe, ultrasonic probe and ultrasonic imaging apparatus |
| JP2003070096A (en) * | 2001-01-25 | 2003-03-07 | Matsushita Electric Ind Co Ltd | Compound piezoelectric material, ultrasonic probe for ultrasonic diagnostic device, the ultrasonic diagnostic device, and manufacturing method for composite piezoelectric body |
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| CN1530649A (en) | 2004-09-22 |
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Granted publication date: 20080702 Termination date: 20110312 |