CN104034804A - Integrated impulse ultrasound-sound transmitting transducer for detecting composite materials - Google Patents
Integrated impulse ultrasound-sound transmitting transducer for detecting composite materials Download PDFInfo
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Abstract
The invention relates to an integrated impulse ultrasound-sound transmitting transducer for detecting composite materials. The integrated impulse ultrasound-sound transmitting transducer comprises a piezoelectric sensing element, a transducer shell, a damping back lining block, a delaying block, an electrode, a connecting base, a sealing cover and a locking ring; a broadband piezoelectric crystal is used for ultrasonic excitation and sound transmitting signal receiving and belongs to the integrated impulse ultrasound-sound transmitting transducer; the integrated impulse ultrasound-sound transmitting transducer has small volume, good time domain pulse characteristics, high detection sensitivity, high resolution ratio, clear law of ultrasound-sound transmitting signals, good accuracy on qualitatively and quantitatively detecting defects, and good applicability, can be used for manual scanning detection, automatic scanning detection and defect imaging analysis of parts with different composite materials, and can remarkably improve the ultrasonic inspection resolution ratio and a surface non-detection zone of the composite material and greatly improve the detect detection capability of the composite materials, the detection thickness can reach 50mm, the detection sensitivity to defects with phi3mm and the depth of 45mm can be achieved, and the frequency selection range is 1-7.5MHz.
Description
Technical field
The invention belongs to Dynamic Non-Destruction Measurement, relate to a kind of integrated form impulse ultrasound-acoustic emission transducer for detection of compound substance of the Non-Destructive Testing for the field compound substances such as Aeronautics and Astronautics, weapons, boats and ships, metallurgy, iron and steel, traffic, building and metal structure.
Background technology
Ultrasonic is the important method that is widely used at present various materials and the quantitative Non-Destructive Testing of fault of construction thereof, be used widely in fields such as Aero-Space, weapons, electronics, boats and ships, metallurgy, petrochemical industry oil, traffic, buildings, particularly, in field of compound material, current 80% composite structure has all adopted Ultrasonic Detection.At present, mainly contain reflectometry and through transmission technique for compound material ultrasound detection method, utilize external ultrasound pulse sound source, the reflection/transmission sound wave behavior forming in detected compound substance, carry out detection and the differentiation of defect, its main deficiency is: (1) is very responsive to defect orientation, along with the angle between defect orientation and the incident acoustic wave direction of propagation increases, Detection capability to defect significantly declines, and then easily causes undetected; (2) acoustic attenuation is violent, is difficult to realize the Non-Destructive Testing of the material that the acoustic attenuation such as large thickness compound substance and concrete dynamic modulus compound substance are violent.
Ultrasonic-acoustic emission detection has become the important lossless detection method addressing the above problem.Conventionally compound material ultrasound-acoustic emission need to produce excitation ultrasound wave by a ultrasound emission transducer, in detected compound substance, form acoustic emission signal, need another transducer to receive the acoustic emission signal from composite inner simultaneously, the separate type transducer of two independent distribution that proportion characteristic matches conventionally, shown in Figure 1, he is made up of acoustic emission excitation transducer 10, acoustic emission receiving transducer 11, acoustic emission signal 12 and detected composite material parts 13.Its main deficiency is that (1) volume is too large, synchronously difficulty; (2) how much scanning blind areas are large; (3) the time domain pulse characteristic of transducer is poor; (4) resolution and detection sensitivity are low, detection signal rule complexity, defect qualitative, quantitative difficulty.
Summary of the invention
The object of this invention is to provide a kind of integrated form impulse ultrasound-acoustic emission transducer detecting for compound substance, reduce how much scanning blind areas of conventional ultrasound-acoustic emission, improve the time domain pulse characteristic of transducer, improve accuracy and the defect detection ability of detection sensitivity and resolution and ultrasonic-acoustic emission defects detection qualitative, quantitative.
Technical solution of the present invention is, comprises transducer housing, damping back of the body village piece, piezoelectric sensor, time delay piece, matching layer, retaining ring, electrode, capping and Connection Block,
The upper surface of damping back of the body piece lower surface, village and piezoelectric sensor is adhesively fixed; Piezoelectric sensor is processed by the piezoelectric crystal of a pair of Frequency Response Matching, adopt symmetrical or asymmetric two kinds of Frequency Response Matching patterns, frequency range is 1MHz-10MHz, and geometric layout is one of 3 kinds of different layouts: 1) piezoelectric crystal is processed into two symmetrical semicircles; 2) piezoelectric crystal is processed into circle, and piezoelectric crystal is processed into annular, and piezoelectric crystal is placed in the annulus of piezoelectric crystal; 3) piezoelectric crystal is processed into annular, and another piezoelectric crystal is processed into circle, and circular piezoelectric crystal is placed in the annulus of annular piezoelectric crystal;
Matching layer adopts acoustic window material to make, and the lower surface of the upper surface of matching layer and two piezoelectric crystals is gluing fixing;
Time delay piece adopts acoustic window material, be processed into cylindrical entrant sound post, this entrant sound post is processed into the right cylinder of upper and lower 2 different-diameters, the outside diameter of entrant sound post epimere coordinates with retaining ring epimere inner circle diametric clearance, the outside diameter of entrant sound post hypomere and retaining ring lower end clearance fit, upper and lower two end faces of time delay piece are parallel; Matching layer is placed on time delay piece upper surface, and damping back of the body village piece, piezoelectric sensor, matching layer time delay piece are fixed in transducer housing;
Electrode is made up of two groups of positive and negative electrodes, wherein positive level one end of one group is connected with the positive level of a piezoelectric crystal, the other end and Connection Block join, one end of negative level is connected with the negative level of this piezoelectric crystal, the other end and Connection Block join, and positive level one end of another group is connected with the positive level of another piezoelectric crystal, and the other end and Connection Block join, one end of negative level is connected with the negative level of this piezoelectric crystal, and the other end and Connection Block join;
Connection Block is fixed by nut and transducer housing.
Transducer housing is a right cylinder, at this cylinder axis to the center pit that is processed with a perforation, be processed with convex round platform in the lower end of center pit, the internal diameter of this convex round platform is 0.8-0.9 times of piezoelectric sensor external diameter, in the upper end of center pit, be processed with an internal thread boss, piezoelectric sensor is fixed on transducer housing convex round platform top, and matching layer lower surface flushes with the lower surface of transducer housing convex round platform; In the upper end of transducer housing, one side is processed with a through hole, and this through-hole diameter mates with Connection Block, is processed with outer round thread in transducer housing lower end, and round thread mates with retaining ring internal thread in addition.
Retaining ring is processed by a right cylinder, be processed with an axially extending bore in this right cylinder central axial direction, the outside diameter clearance fit of the internal diameter of this through hole and time delay piece hypomere, the epimere of axially extending bore is processed into internal thread hole, the outside diameter clearance fit of the external diameter of this threaded hole and time delay piece epimere, the 0.8-0.9 that the height of this threaded hole is axially extending bore doubly.
Time delay piece adopts solid acoustic window material or liquid acoustic window material, and time delay block length is 1-100mm.
Different with testing requirement according to detected composite material parts feature, the dimensions of two piezoelectric crystals in-acoustic emission transducer ultrasonic by selecting and piezoelectric property and frequency characteristic, improve ultrasonic-acoustic emission detection sensitivity and defect detection ability and the detectability to large thickness compound substance.
Transducer is hand-held or is arranged on automatic checkout equipment.
The frequency range of choice of transducer is 1MHz-7.5MHz, adapts to the detection of the composite material parts of different testing requirements and different-thickness and different qualities.
The advantage that the present invention has and beneficial effect,
The present invention adopts the reception of broadband piezoelectric crystal as ultrasonic action and acoustic emission signal, combine and optimize by frequency characteristic, improve the quality of transducer, improve widely the time domain pulse characteristic of transducer, detection sensitivity and resolution are significantly improved, make the rule of ultrasonic-acoustic emission signal become very clear, greatly improved the accuracy of ultrasonic-acoustic emission defects detection qualitative, quantitative.
The invention belongs to integrated form ultrasonic-acoustic emission transducer, volume is little, does not need synchronizing linkage, is convenient to very much scanning and detects, and has reduced widely by how much scanning blind areas.
A kind of integrated form impulse ultrasound-acoustic emission transducer detecting for compound substance of the present invention, adopt the reception of broadband piezoelectric crystal as ultrasonic action and acoustic emission signal, combine and optimize by frequency characteristic, improve the quality of transducer, improve widely the time domain pulse characteristic of transducer, significantly improve detection sensitivity and resolution, made the rule of ultrasonic-acoustic emission signal become very clear, greatly improved the accuracy of ultrasonic-acoustic emission defects detection qualitative, quantitative.
The invention belongs to integrated form ultrasonic-acoustic emission transducer, for launch ultrasonic rolling land piezoelectric crystal and for the piezoelectric crystal product that receives acoustic emission signal without carrying out sound isolation, can not produce mutual signal yet and disturb, but also there are symmetrical and asymmetric two kinds of mode of operations, can better realize various different composite materials ultrasonic-acoustic emission detection, significantly improved the ultrasonic-Detection capability of acoustic emission method to composite material defect and detectability to large thickness compound substance.
Brief description of the drawings
Fig. 1 is existing compound material ultrasound-acoustic emission transducer structural representation;
Fig. 2 is the integrated form impulse ultrasound-acoustic emission transducer structural representation of the present invention for detection of compound substance;
Fig. 3 is piezoelectric crystal 3A in the piezoelectric sensor 3 in the present invention and the schematic layout pattern of 3B.
Embodiment
Below in conjunction with accompanying drawing, the present invention is elaborated.
For detection of integrated form impulse ultrasound-acoustic emission transducer of compound substance, comprise transducer housing 1, damping back of the body village piece 2, piezoelectric sensor 3, time delay piece 4, matching layer 5, retaining ring 6, electrode 7, capping 8 and Connection Block 9, shown in Figure 2.
Damping back of the body village piece 2 adopts epoxy resin and tungsten powder to mix, and the upper surface of damping back of the body piece 2 lower surfaces, village and piezoelectric sensor 3 is adhesively fixed;
Piezoelectric sensor 3 is processed by piezoelectric crystal 3A and the 3B of a pair of Frequency Response Matching, adopt symmetrical or asymmetric two kinds of Frequency Response Matching patterns, frequency range is 1MHz-10MHz, and geometric layout is one of 3 kinds of different layouts: 1) piezoelectric crystal 3A and 3B are processed into two symmetrical semicircles; 2) piezoelectric crystal 3A is processed into circle, and piezoelectric crystal 3B is processed into annular, and piezoelectric crystal 3A is placed in the annulus of piezoelectric crystal 3B; 3) piezoelectric crystal 3A is processed into annular, and piezoelectric crystal 3B is processed into circle, and piezoelectric crystal 3B is placed in the annulus of piezoelectric crystal 3A, shown in Figure 3; Piezoelectric sensor 3 is fixed on the convex round platform top, lower end of transducer housing 1 by cementing agent;
Matching layer 5 adopts acoustic window material to make, and the upper surface of matching layer 5 and piezoelectric crystal 3A and piezoelectric crystal 3B lower surface are gluing fixing;
Time delay piece 4 adopts acoustic window material, be processed into cylindrical entrant sound post, this entrant sound post is processed into the right cylinder of upper and lower 2 different-diameters, the outside diameter of entrant sound post epimere coordinates with retaining ring 6 epimere inner circle diametric clearance, the outside diameter of entrant sound post hypomere and retaining ring 6 lower end clearance fit, upper and lower two end faces of time delay piece 4 are parallel; Matching layer 5 is placed on time delay piece 4 upper surfaces, and damping back of the body village piece 2, piezoelectric sensor 3, matching layer 5 time delay pieces 4 are fixed in transducer housing 1;
Electrode 7 is made up of two groups of positive and negative electrodes, wherein positive level one end of one group is connected with the positive level of piezoelectric crystal 3A, the other end and Connection Block 9 join, one end of negative level is connected with the negative level of piezoelectric crystal 3A, the other end and Connection Block 9 join, and positive level one end of another group is connected with the positive level of piezoelectric crystal 3B, and the other end and Connection Block 9 join, one end of negative level is connected with the negative level of piezoelectric crystal 3B, and the other end and Connection Block 9 join;
Connection Block 9 is fixing by nut and transducer housing 1.
Transducer housing 1 is a right cylinder, at this cylinder axis to the center pit that is processed with a perforation, be processed with convex round platform in the lower end of center pit, the internal diameter of this convex round platform is 0.8-0.9 times of piezoelectric sensor 3 external diameters, in the upper end of center pit, be processed with an internal thread boss, piezoelectric sensor 3 is fixed on transducer housing 1 convex round platform top, and matching layer 5 lower surfaces flush with the lower surface of transducer housing 1 convex round platform; In the upper end of transducer housing 1, a side is processed with a through hole, and this through-hole diameter mates with Connection Block 9, is processed with outer round thread in transducer housing 1 lower end, and round thread mates with retaining ring 6 internal threads in addition.
Retaining ring 6 is processed by a right cylinder, be processed with an axially extending bore in this right cylinder central axial direction, the outside diameter clearance fit of the internal diameter of this through hole and time delay piece 4 hypomeres, the epimere of axially extending bore is processed into internal thread hole, the outside diameter clearance fit of the external diameter of this threaded hole and time delay piece 4 epimeres, the 0.8-0.9 that the height of this threaded hole is axially extending bore doubly.
Time delay piece adopts solid acoustic window material or liquid acoustic window material, and time delay block length is 1-100mm.
Different with testing requirement according to detected composite material parts feature, piezoelectric crystal 3A in-acoustic emission transducer ultrasonic by selecting and 3B dimensions and piezoelectric property and frequency characteristic, improve ultrasonic-acoustic emission detection sensitivity and defect detection ability and the detectability to large thickness compound substance, maximum compound substance detects thickness can reach 50mm, and detection sensitivity can reach the dark Ф 3mm of 45mm defect.
Transducer is hand-held or is arranged on automatic checkout equipment, detects and defect imaging analysis for the manual scanning detection of composite material parts or the autoscan of composite material parts.
The frequency range of choice of transducer is 1MHz-7.5MHz, for the detection of the composite material parts of different testing requirements and different-thickness and different qualities.
Claims (7)
1. the integrated form impulse ultrasound-acoustic emission transducer for detection of compound substance, comprise transducer housing (1), damping back of the body village's piece (2), piezoelectric sensor (3), time delay piece (4), matching layer (5), retaining ring (6), electrode (7), capping (8) and Connection Block (9), it is characterized in that
The upper surface of damping back of the body piece (2) lower surface, village and piezoelectric sensor (3) is adhesively fixed; Piezoelectric sensor (3) is processed by the piezoelectric crystal (3A and 3B) of a pair of Frequency Response Matching, adopt symmetrical or asymmetric two kinds of Frequency Response Matching patterns, frequency range is 1MHz-10MHz, and geometric layout is one of 3 kinds of different layouts: 1) piezoelectric crystal (3A and 3B) is processed into two symmetrical semicircles; 2) piezoelectric crystal (3A) is processed into circle, and piezoelectric crystal (3B) is processed into annular, and piezoelectric crystal (3A) is placed in the annulus of piezoelectric crystal (3B); 3) piezoelectric crystal (3A) is processed into annular, and another piezoelectric crystal (3B) is processed into circle, and circular piezoelectric crystal (3B) is placed in the annulus of annular piezoelectric crystal (3A);
Matching layer (5) adopts acoustic window material to make, and the lower surface of the upper surface of matching layer (5) and two piezoelectric crystals (3A and 3B) is gluing fixing;
Time delay piece (4) adopts acoustic window material, be processed into cylindrical entrant sound post, this entrant sound post is processed into the right cylinder of upper and lower 2 different-diameters, the outside diameter of entrant sound post epimere coordinates with retaining ring (6) epimere inner circle diametric clearance, the outside diameter of entrant sound post hypomere and retaining ring (6) lower end clearance fit, upper and lower two end faces of time delay piece (4) are parallel; Matching layer (5) is placed on time delay piece (4) upper surface, and damping back of the body village's piece (2), piezoelectric sensor (3), matching layer (5) time delay piece (4) are fixed in transducer housing (1);
Electrode (7) is made up of two groups of positive and negative electrodes, wherein positive level one end of one group is connected with the positive level of piezoelectric crystal (3A), the other end and Connection Block (9) join, one end of negative level is connected with the negative level of piezoelectric crystal (3A), the other end and Connection Block (9) join, positive level one end of another group is connected with the positive level of piezoelectric crystal (3B), the other end and Connection Block (9) join, one end of negative level is connected with the negative level of piezoelectric crystal (3B), and the other end and Connection Block (9) join;
Connection Block (9) is fixing by nut and transducer housing (1).
2. a kind of integrated form impulse ultrasound-acoustic emission transducer for detection of compound substance according to claim 1, it is characterized in that, transducer housing (1) is a right cylinder, at this cylinder axis to the center pit that is processed with a perforation, be processed with convex round platform in the lower end of center pit, the internal diameter of this convex round platform is 0.8-0.9 times of piezoelectric sensor (3) external diameter, in the upper end of center pit, be processed with an internal thread boss, piezoelectric sensor (3) is fixed on transducer housing (1) convex round platform top, matching layer (5) lower surface flushes with the lower surface of transducer housing (1) convex round platform, in the upper end of transducer housing (1), a side is processed with a through hole, this through-hole diameter mates with Connection Block (9), be processed with outer round thread in transducer housing (1) lower end, round thread mates with retaining ring (6) internal thread in addition.
3. a kind of integrated form impulse ultrasound-acoustic emission transducer for detection of compound substance according to claim 1, it is characterized in that, retaining ring (6) is processed by a right cylinder, be processed with an axially extending bore in this right cylinder central axial direction, the outside diameter clearance fit of the internal diameter of this through hole and time delay piece (4) hypomere, the epimere of axially extending bore is processed into internal thread hole, the outside diameter clearance fit of the external diameter of this threaded hole and time delay piece (4) epimere, the 0.8-0.9 that the height of this threaded hole is axially extending bore doubly.
4. a kind of integrated form impulse ultrasound-acoustic emission transducer for detection of compound substance according to claim 1, is characterized in that, time delay piece (4) adopts solid acoustic window material or liquid acoustic window material, and time delay block length is 1-100mm.
5. a kind of integrated form impulse ultrasound-acoustic emission transducer for detection of compound substance according to claim 1, it is characterized in that, different with testing requirement according to detected composite material parts feature, dimensions and piezoelectric property and the frequency characteristic of the piezoelectric crystal (3A and 3B) in-acoustic emission transducer ultrasonic by selecting, improve ultrasonic-acoustic emission detection sensitivity and defect detection ability and the detectability to large thickness compound substance.
6. a kind of integrated form impulse ultrasound-acoustic emission transducer for detection of compound substance according to claim 1, is characterized in that, transducer is hand-held or is arranged on automatic checkout equipment.
7. a kind of integrated form impulse ultrasound-acoustic emission transducer for detection of compound substance according to claim 1, is characterized in that, the frequency range of choice of transducer is 1MHz-7.5MHz.
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Cited By (8)
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| CN104990985A (en) * | 2015-07-15 | 2015-10-21 | 常州市常超电子研究所有限公司 | Delay straight 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 |
| CN105334265A (en) * | 2015-10-22 | 2016-02-17 | 东北大学 | Acoustic emission sensor used for high-pressure oil medium |
| 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 |
| 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 |
| 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 |
| CN110320280A (en) * | 2019-07-01 | 2019-10-11 | 中航复合材料有限责任公司 | A kind of ultrasonic transducer clamp for the detection of small space composite structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110320280A (en) * | 2019-07-01 | 2019-10-11 | 中航复合材料有限责任公司 | A kind of ultrasonic transducer clamp for the detection of small space composite structure |
| 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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