CN104034804B - A kind of integrated form impulse ultrasound-acoustic emission transducer for detecting composite - Google Patents
A kind of integrated form impulse ultrasound-acoustic emission transducer for detecting composite Download PDFInfo
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- CN104034804B CN104034804B CN201410276102.6A CN201410276102A CN104034804B CN 104034804 B CN104034804 B CN 104034804B CN 201410276102 A CN201410276102 A CN 201410276102A CN 104034804 B CN104034804 B CN 104034804B
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Abstract
The present invention relates to a kind of integrated form impulse ultrasound acoustic emission transducer for detecting composite.Including piezoelectric sensor, transducer housing, damping back of the body village block, delay block, electrode, connection seat, capping and retaining ring.Use broadband piezoquartz as ultrasonic action and the reception of acoustic emission signal, belong to the ultrasonic acoustic emission transducer of integrated form, volume is little, time domain impulse characteristic is good, detection sensitivity and resolution are high, ultrasonic acoustic emission signal rule is the most clear, the accuracy of defects detection qualitative, quantitative, the suitability is the best, can be used for manual scanning detection and automatic Scanning Detction and the defect imaging analysis of different composite material parts, significantly improve compound material ultrasound detection resolution and Surface testing blind area, drastically increase defect detection of composite materials ability, detection thickness is up to 50mm, detection sensitivity is up to Ф 3mm, the deep defect of 45mm, the frequency range of choice 1 7.5MHz.
Description
Technical field
The invention belongs to Dynamic Non-Destruction Measurement, relate to a kind of for Aeronautics and Astronautics, weapons, boats and ships,
The Non-Destructive Testing of the field composites such as metallurgy, iron and steel, traffic, building and metal structure
For detecting the integrated form impulse ultrasound-acoustic emission transducer of composite.
Background technology
Ultrasonic it is to be now widely used in the important of various material and fault of construction quantitative NDT thereof
Method, in Aero-Space, weapons, electronics, boats and ships, metallurgy, petrochemical industry oil, traffic, build
It is used widely in the field such as build, particularly in field of compound material, and current 80% composite knot
Structure all have employed ultrasound detection.It is presently used for compound material ultrasound detection method and mainly has bounce technique
And through-transmission technique, utilize external ultrasound pulse sound source, the reflection formed in detected composite/
Transmitted acoustic pulse behavior, carries out detection and the differentiation of defect, and its main deficiency is: defect is taken by (1)
To very sensitive, along with the angle between defect orientation and the incident acoustic wave direction of propagation increases, to lacking
The Detection capability fallen into is remarkably decreased, and then easily causes missing inspection；(2) SATT is violent, it is difficult to
Realize the lossless of the violent material of the SATTs such as big thickness composite and concrete dynamic modulus composite
Detection.
Ultrasonic-acoustic emission detection has become the important lossless detection method solving the problems referred to above.
Generally compound material ultrasound-acoustic emission needs by a ultrasound emission transducer generation excitation ultrasonic
Ripple, forms acoustic emission signal in detected composite, simultaneously need to another transducer receives
From the acoustic emission signal of composite inner, generally use two independences that frequency characteristic matches
The separate type transducer of distribution, shown in Figure 1, he is sent out by acoustic emission excitation transducer 10, sound
Penetrate reception transducer 11, acoustic emission signal 12 and detected composite material parts 13 to constitute.It is main
Wanting deficiency is that (1) volume is too big, synchronizes difficulty；(2) geometry scanning blind area is big；(3) transducing
The time domain impulse characteristic of device is poor；(4) resolution and detection sensitivity are low, and detection signal rule is complicated,
Flaw discrimination difficult quantitation.
Summary of the invention
It is an object of the invention to provide a kind of integrated form impulse ultrasound-sound for composite detection
Transmitting transducer, reduces conventional ultrasound-acoustic emission geometry scanning blind area, improves the time domain arteries and veins of transducer
Rush characteristic, improve detection sensitivity and resolution and the standard of ultrasonic-acoustic emission defects detection qualitative, quantitative
Really property and defect detection ability.
The technical solution of the present invention is, passes including transducer housing, damping back of the body village block, piezoelectricity
Sensing unit, delay block, matching layer, retaining ring, electrode, cover and connect seat,
Damping back of the body block lower surface, village is adhesively fixed with the upper surface of piezoelectric sensor；Piezoelectric sensing unit
Part is processed by the piezoquartz of a pair Frequency Response Matching, uses symmetrically or non-symmetrically two kinds of frequencies
Rate characteristics match pattern, frequency range is 1MHz-10MHz, and geometric layout is 3 kinds of different layouts
One of: 1) piezoquartz is processed into two symmetrical semicircles；2) piezoquartz is processed into circle,
Piezoquartz is processed into annular, and piezoquartz is placed in the annulus of piezoquartz；3) pressure
Electric crystal is processed into annular, and another piezoquartz is processed into circle, and circular piezoelectric crystal is placed in
In the annulus of annular piezoquartz；
Matching layer uses acoustic window material to make, the upper surface of matching layer and the following table of two piezoquartzes
Face is gluing fixing；
Delay block uses acoustic window material, is processed into cylindrical entrant sound post, and this entrant sound post is processed into up and down
The cylinder of 2 different-diameters, the outside diameter of entrant sound post epimere and circular diameter in retaining ring epimere
Matched in clearance, the outside diameter of entrant sound post hypomere coordinates with retaining ring lower gap, and delay block is upper and lower
Two end faces are parallel；Matching layer is placed on delay block upper surface, damping back of the body village block, piezoelectric sensing unit
Part, matching layer delay block are fixed in transducer housing；
Electrode is made up of two groups of positive and negative electrodes, positive level one end of one of which and a piezoquartz
Positive level connects, and the other end connects with being connected seat, and one end of negative level is connected with the negative level of this piezoquartz,
The other end connects with being connected seat, positive level one end of another group and the positive cascade of another piezoquartz
Connecing, the other end connects with being connected seat, and one end of negative level is connected with the negative level of this piezoquartz, another
Hold and be connected seat and connect；
Connect seat to be fixed with transducer housing by nut.
Transducer housing is a cylinder, at this cylinder axis to being machined with a through center
Hole, is machined with convex round platform in the lower end of centre bore, and the internal diameter of this convex round platform is piezoelectric sensing unit
0.8-0.9 times of part external diameter, in the upper end of centre bore, is machined with a female thread boss, and piezoelectricity passes
Sensing unit is fixed on above transducer housing convex round platform, in matching layer lower surface and transducer housing
The lower surface of dome platform flushes；It is machined with a through hole, this through hole in the side, upper end of transducer housing
Diameter be connected seat coupling, be machined with outer round thread in transducer housing lower end, in addition round thread with
Retaining ring female thread mates.
Retaining ring is processed by a cylinder, is machined with an axle in this its center axis direction
To the outside diameter matched in clearance of through hole, the internal diameter of this through hole and delay block hypomere, by axially extending bore
Epimere be processed into internal thread hole, the outside diameter gap of the external diameter of this screwed hole and delay block epimere
Coordinating, the height of this screwed hole is 0.8-0.9 times of axially extending bore.
Delay block uses solid acoustic window material or liquid acoustic window material, a length of 1-100mm of delay block.
Different with testing requirement according to detected composite material parts feature, by selecting ultrasonic-sound to send out
Penetrate the dimensions of two piezoquartzes in transducer and piezoelectric property and frequency characteristic, improve super
Sound-acoustic emission detection sensitivity and defect detection ability and the power of test to big thickness composite.
Transducer is hand-held or is arranged on automatic checkout equipment.
The frequency range of choice of transducer is 1MHz-7.5MHz, adapts to different testing requirement and difference
The detection of the composite material parts of thickness and different qualities.
The present invention has the advantage that and beneficial effect,
The present invention uses broadband piezoquartz as ultrasonic action and the reception of acoustic emission signal, leads to
Overfrequency property combination and optimization, improve the quality of transducer, significantly improve transducer time
Territory pulse characteristic, significantly improves detection sensitivity and resolution, makes the rule of ultrasonic-acoustic emission signal
Rule becomes very clear, drastically increases the accurate of ultrasonic-acoustic emission defects detection qualitative, quantitative
Property.
The invention belongs to integrated form ultrasonic-acoustic emission transducer, volume is little, it is not necessary to lazy-tongs,
It is highly convenient for scanning detection, greatly reduces geometry scanning blind area.
A kind of integrated form impulse ultrasound-acoustic emission transducer for composite detection of the present invention,
Use broadband piezoquartz as ultrasonic action and the reception of acoustic emission signal, pass through frequency characteristic
Combination and optimization, improve the quality of transducer, significantly improve the time domain impulse characteristic of transducer,
Significantly improve detection sensitivity and resolution, make the rule of ultrasonic-acoustic emission signal become ten and distinguish
Clear, drastically increase the accuracy of ultrasonic-acoustic emission defects detection qualitative, quantitative.
The invention belongs to integrated form ultrasonic-acoustic emission transducer, be used for launching ultrasonic rolling land piezo crystals
Body and for receiving the piezoquartz product of acoustic emission signal without carrying out being acoustically separated from, also will not producing
Mutual signal disturbing, but also there are symmetrical and asymmetric two kinds of mode of operations, can be preferably real
Ultrasonic-the acoustic emission detection of existing various different composite materials, significantly improves ultrasonic-acoustic emission method
To the Detection capability of composite material defect and the power of test to big thickness composite.
Accompanying drawing explanation
Fig. 1 is existing compound material ultrasound-acoustic emission transducer structural representation；
Fig. 2 is that the present invention is for detecting the integrated form impulse ultrasound-acoustic emission transducer of composite
Structural representation；
Fig. 3 is that the layout of piezoquartz 3A and 3B in the piezoelectric sensor 3 in the present invention is shown
It is intended to.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is elaborated.
A kind of integrated form impulse ultrasound-acoustic emission transducer for detecting composite, including changing
Can device housing 1, damping back of the body village block 2, piezoelectric sensor 3, delay block 4, matching layer 5, lock
Tight ring 6, electrode 7, capping 8 and connection seat 9, shown in Figure 2.
Damping back of the body village block 2 uses epoxy resin and tungsten powder to mix, damping back of the body block 2 lower surface, village
It is adhesively fixed with the upper surface of piezoelectric sensor 3；
Piezoelectric sensor 3 is processed by piezoquartz 3A and 3B of a pair Frequency Response Matching,
Using symmetrically or non-symmetrically two kinds of Frequency Response Matching patterns, frequency range is 1MHz-10MHz, several
What layout is one of 3 kinds of different layouts: 1) piezoquartz 3A and 3B is processed into two symmetries
Semicircle；2) piezoquartz 3A is processed into circle, and piezoquartz 3B is processed into annular,
Piezoquartz 3A is placed in the annulus of piezoquartz 3B；3) piezoquartz 3A is processed into annular,
Piezoquartz 3B is processed into circle, and piezoquartz 3B is placed in the annulus of piezoquartz 3A, ginseng
As shown in Figure 3；Piezoelectric sensor 3 is fixed in the lower end of transducer housing 1 by binding agent
Above dome platform；
Matching layer 5 uses acoustic window material to make, the upper surface of matching layer 5 and piezoquartz 3A and
Piezoquartz 3B lower surface is gluing fixing；
Delay block 4 uses acoustic window material, is processed into cylindrical entrant sound post, and this entrant sound post is processed into
The cylinder of lower 2 different-diameters, the outside diameter of entrant sound post epimere and retaining ring 6 epimere inner circle
Diametric clearance coordinates, and the outside diameter of entrant sound post hypomere coordinates with retaining ring 6 lower gap, time delay
About 4 two end faces of block are parallel；Matching layer 5 is placed on delay block 4 upper surface, damping back of the body village block
2, piezoelectric sensor 3, matching layer 5 delay block 4 are fixed in transducer housing 1；
Electrode 7 is made up of two groups of positive and negative electrodes, positive level one end of one of which and piezoquartz 3A
Positive level connect, the other end connects with being connected seat 9, one end of negative level and bearing of piezoquartz 3A
Level connects, and the other end connects with being connected seat 9, and positive level one end of another group is with piezoquartz 3B's
Positive level connects, and the other end connects with being connected seat 9, one end of negative level and the negative level of piezoquartz 3B
Connecting, the other end connects with being connected seat 9；
Connect seat 9 to be fixed with transducer housing 1 by nut.
Transducer housing 1 is a cylinder, at this cylinder axis to being machined with a through center
Hole, is machined with convex round platform in the lower end of centre bore, and the internal diameter of this convex round platform is piezoelectric sensing unit
0.8-0.9 times of part 3 external diameter, in the upper end of centre bore, is machined with a female thread boss, piezoelectricity
Sensing element 3 is fixed on above transducer housing 1 convex round platform, matching layer 5 lower surface and transducing
The lower surface of device housing 1 convex round platform flushes；It is machined with one in the side, upper end of transducer housing 1
Through hole, this through-hole diameter mates with being connected seat 9, is machined with cylindrical spiral shell in transducer housing 1 lower end
Stricture of vagina, round thread mates with retaining ring 6 female thread in addition.
Retaining ring 6 is processed by a cylinder, is machined with one in this its center axis direction
The outside diameter matched in clearance of axially extending bore, the internal diameter of this through hole and delay block 4 hypomere, will be axially
The epimere of through hole is processed into internal thread hole, and the external diameter of this screwed hole is straight with the cylindrical of delay block 4 epimere
Footpath matched in clearance, the height of this screwed hole is 0.8-0.9 times of axially extending bore.
Delay block uses solid acoustic window material or liquid acoustic window material, a length of 1-100mm of delay block.
Different with testing requirement according to detected composite material parts feature, by selecting ultrasonic-sound to send out
Penetrate the piezoquartz 3A in transducer and 3B dimensions and piezoelectric property and frequency characteristic, improve
Ultrasonic-acoustic emission detection sensitivity and defect detection ability and the detection energy to big thickness composite
Power, maximum composite detection thickness is up to 50mm, and detection sensitivity is up to 45mm deep Ф 3mm
Defect.
Transducer is hand-held or is arranged on automatic checkout equipment, for the hands of composite material parts
Work Scanning Detction or the automatic Scanning Detction of composite material parts and defect imaging analysis.
The frequency range of choice of transducer is 1MHz-7.5MHz, for different testing requirements and difference
The detection of the composite material parts of thickness and different qualities.
Claims (5)
1. for detecting integrated form impulse ultrasound-acoustic emission transducer of composite, including
Transducer housing (1), damping backing block (2), piezoelectric sensor (3), delay block (4),
Matching layer (5), retaining ring (6), electrode (7), capping (8) and connection seat (9), it is special
Levy and be,
Damping backing block (2) lower surface is adhesively fixed with the upper surface of piezoelectric sensor (3)；
Piezoelectric sensor (3) is by piezoquartz (3A and the 3B) processing of a pair Frequency Response Matching
Becoming, use symmetrically or non-symmetrically two kinds of Frequency Response Matching patterns, frequency range is 1MHz-10MHz,
Geometric layout is one of 2 kinds of different layouts: 1) piezoquartz (3A and 3B) is processed into two
Symmetrical semicircle；2) piezoquartz is processed into annular, and another piezoquartz is processed
Circular, circular piezoelectric crystal is placed in the annulus of annular piezoquartz；
Matching layer (5) uses acoustic window material to make, the upper surface of matching layer (5) and two piezoelectricity
The lower surface of crystal (3A and 3B) is gluing fixing；
Delay block (4) uses liquid acoustic window material, a length of 1-100mm of delay block, is processed into circle
Cylindricality entrant sound post, this entrant sound post is processed into the cylinder of upper and lower 2 different-diameters, entrant sound post epimere
Outside diameter coordinate with retaining ring (6) epimere inner circle diametric clearance, the cylindrical of entrant sound post hypomere
Diameter coordinates with retaining ring (6) lower gap, and upper and lower two end faces of delay block (4) are parallel；?
Join layer (5) to be placed on delay block (4) upper surface, damping backing block (2), piezoelectric sensor
(3), matching layer (5), delay block (4) are fixed in transducer housing (1)；
Electrode (7) is made up of two groups of positive and negative electrodes, positive pole one end of one of which and a piezoelectricity
The positive pole of crystal (3A) connects, and the other end connects with being connected seat (9), one end of negative pole and this
The negative pole of piezoquartz (3A) connects, and the other end connects with being connected seat (9), and another group is just
One end, pole is connected with the positive pole of another piezoquartz (3B), the other end be connected seat (9) phase
Connecing, one end of negative pole is connected with the negative pole of this piezoquartz (3B), the other end be connected seat (9)
Connect；
Connect seat (9) to be fixed with transducer housing (1) by nut；
The frequency range of choice of transducer is 1MHz-7.5MHz.
A kind of integrated form pulse for detecting composite the most according to claim 1 surpasses
Sound-acoustic emission transducer, is characterized in that, transducer housing (1) is a cylinder, at this cylinder
Body is axially machined with a through centre bore, is machined with convex round platform in the lower end of centre bore, this
The internal diameter of convex round platform is 0.8-0.9 times of piezoelectric sensor (3) external diameter, at centre bore
Upper end, is machined with a female thread boss, and piezoelectric sensor (3) is fixed on transducer housing (1)
Above convex round platform, matching layer (5) lower surface and the lower end of transducer housing (1) convex round platform
Face flushes；Be machined with a through hole in the side, upper end of transducer housing (1), this through-hole diameter with
Connect seat (9) coupling, be machined with outer round thread in transducer housing (1) lower end, this cylindrical spiral shell
Stricture of vagina mates with retaining ring (6) female thread.
A kind of integrated form impulse ultrasound for detecting composite the most according to claim 1
-acoustic emission transducer, is characterized in that, retaining ring (6) is processed by a cylinder, circle at this
Cylinder central axial direction is machined with an axially extending bore, under the internal diameter of this through hole and delay block (4)
The outside diameter matched in clearance of section, is processed into internal thread hole by the epimere of axially extending bore, this screwed hole
The outside diameter matched in clearance of external diameter and delay block (4) epimere, the height of this screwed hole is axle
To 0.8-0.9 times of through hole.
A kind of integrated form pulse for detecting composite the most according to claim 1 surpasses
Sound-acoustic emission transducer, is characterized in that, according to detected composite material parts feature and testing requirement
Difference, is advised by the size selecting the piezoquartz (3A and 3B) in ultrasonic-acoustic emission transducer
Lattice and piezoelectric property and frequency characteristic, improve ultrasonic-acoustic emission detection sensitivity and defect detection ability
With the power of test to big thickness composite.
A kind of integrated form pulse for detecting composite the most according to claim 1 surpasses
Sound-acoustic emission transducer, is characterized in that, transducer is hand-held or is arranged on automatic checkout equipment.
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| CN104034804B true CN104034804B (en) | 2016-08-24 |
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| CN104990985B (en) * | 2015-07-15 | 2017-11-10 | 常州市常超电子研究所有限公司 | Band delay normal probe |
| CN104990986A (en) * | 2015-07-15 | 2015-10-21 | 常州市常超电子研究所有限公司 | Contact type straight beam probe |
| CN105334265B (en) * | 2015-10-22 | 2017-12-29 | 东北大学 | A kind of acoustic emission sensor being used in high pressure oil medium |
| CN107884478A (en) * | 2016-09-29 | 2018-04-06 | 航天特种材料及工艺技术研究所 | A kind of High-resolution ultrasound probe for detecting manually |
| CN107064551A (en) * | 2017-04-10 | 2017-08-18 | 中国科学院合肥物质科学研究院 | A kind of liquid wave guides, high-temperature probe, ultrasonic Doppler velocimeter |
| CN107436166A (en) * | 2017-09-07 | 2017-12-05 | 上海诺仪表有限公司 | A kind of ultrasonic flowmeter transducer |
| CN108088909A (en) * | 2017-12-11 | 2018-05-29 | 江西理工大学 | A kind of highly integrated acoustic emission in rock body sensor of high sensitivity |
| CN110320280B (en) * | 2019-07-01 | 2021-10-15 | 中航复合材料有限责任公司 | Ultrasonic transducer clamp for detecting composite material structure in narrow space |
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| JPH05203632A (en) * | 1992-01-23 | 1993-08-10 | Toshiba Corp | Ultrasonic flaw detection device |
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| US6513385B1 (en) * | 2001-05-08 | 2003-02-04 | Halliburton Energy Services, Inc. | Acoustic sensor for pipeline deposition characterization and monitoring |
| CN101308118A (en) * | 2007-05-14 | 2008-11-19 | 中国科学院金属研究所 | High-sensitivity ultrasonic probe |
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