CN2789767Y - Air ultrasound probe - Google Patents
Air ultrasound probe Download PDFInfo
- Publication number
- CN2789767Y CN2789767Y CN 200520078774 CN200520078774U CN2789767Y CN 2789767 Y CN2789767 Y CN 2789767Y CN 200520078774 CN200520078774 CN 200520078774 CN 200520078774 U CN200520078774 U CN 200520078774U CN 2789767 Y CN2789767 Y CN 2789767Y
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- China
- Prior art keywords
- matching layer
- piezoelectric chip
- utility
- diameter
- focusing lens
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- Expired - Fee Related
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The utility model discloses an air ultrasonic probe, which can be used for noncontact nondestructive inspection. The utility model comprises a concentric cable (1), a metal outer case (2), an absorption block (3), a piezoelectric wafer (4) and an insulating sleeve (5). The utility model is characterized in that the air ultrasonic probe also comprises a matching layer (6), a sound focus lens (7) and an annular pressure sheet (9), wherein the upper end plane of the matching layer (6) is adpressed with the piezoelectric wafer (4), the sound focus lens (7) is adpressed with the matching layer (6), the sound focus lens (7) and the matching layer (6) are tightly pressed on the surface of the piezoelectric wafer (4) by the metal annular pressure sheet (9), and the metal annular pressure sheet (9), the matching layer (6), the matching layer (6) and the sound focus lens (7) are connected together with the metal outer case (2) by a plurality of screws (10). Because the utility model adopts the silicon rubber sound focus lens and the magnesium alloy matching layer, the transmissivity can be increased by almost 40 times. The utility model can perform air ultrasonic inspection.
Description
Technical field
The utility model relates to a kind of detection probe, and particularly the air ultrasound probe is used for contactless Non-Destructive Testing.
Background technology
In ultrasonic detecting technology, utilize ultrasonic probe that ultrasonic emitting is gone out, and then ultrasound wave is received, be transformed into electric signal.
The contact supersonic detection method has detection methods such as ultrasound wave water seaoning, reflectometry and through transmission technique.Reflectometry and through transmission technique require must use liquid or pasty state couplant between ultrasonic probe and the test specimen, require flaw detection straight, no groove in surface and foreign material during detection; Water seaoning requires ultrasonic probe and test specimen all to immerse in the water.
In recent years, detection range has proposed a kind of air ultrasound detection method.Because the air ultrasound detection method, its probe does not contact with detecting test specimen, thereby has a series of remarkable advantages.Such as, detect the high temperature test specimen; In the test specimen process, carry out detection of dynamic, and then realize closed-loop control or the like.
It is that ultrasound wave can produce serious decay in air that air ultrasound detects the main difficulty that exists, and detects to such an extent as to make ultrasound wave can't reach tested workpiece.Causing the main cause of ultrasound wave serious decay in air is the greatest differences of solid material and air-borne sound impedance.The acoustic impedance Z=30 of common metal and piezoelectric crystal～50 * 10 for example
6Kgm
-2s
-1, and the acoustic impedance Z=427kgm of air
-2s
-1, almost total reflection can take place at piezoelectric crystal and air interface ultrasound wave and can't transmission.Therefore, this probe of prior art can't carry out the air ultrasound detection.
With reference to Fig. 2, the contact supersonic detection method is when detecting, and piezoelectric chip 4 and measured object contact with measured object by couplant, when piezoelectric chip 4 separates with measured object, because the acoustic impedance difference of piezoelectric chip 4, air and measured object is bigger, can't carry out Ultrasonic Detection.
Summary of the invention
Low in order to overcome the prior art transmissivity, can not carry out the deficiency that air ultrasound detects, the utility model provides a kind of air ultrasound probe, increases matching layer harmony condenser lens on the basis of existing technology, the transmissivity and the sensitivity of probe are improved, just can carry out air ultrasound and detect.
The technical scheme that its technical matters that solves the utility model adopts is: a kind of air ultrasound probe, comprise concentric cable 1, metal shell 2, absorb piece 3, piezoelectric chip 4 and insulation sleeve 5, it is characterized in that: also comprise matching layer 6, sound focusing lens 7, annular preform 9, be close to piezoelectric chip 4 in the middle of matching layer 6 upper surfaces, sound focusing lens 7 are close to matching layer 6, with metal ring compressing tablet 9 sound focusing lens 7 and matching layer 6 are pressed on the surface of piezoelectric chip 4, use some pieces of screws 10 with metal ring compressing tablet 9 again, matching layer 6 harmony condenser lenses 7 link together with metal shell 2.
Described sound focusing lens 7 adopt silicon rubber, and it is big with the external diameter of metal shell 2 etc. that it installs diameter, and effective diameter is big with the diameter of piezoelectric chip 4 etc., is 15～30mm, and interior thickness is 1～2mm.
Described matching layer 6 adopts magnesium alloys, and its diameter is big with the external diameter of metal shell 2 etc., and thickness is 3～4.5mm.
The utility model advantage compared to existing technology is: owing to adopted silicon rubber sound focusing lens, the acoustic impedance Z=1.04 of silicon rubber * 10
6Kgm
-2s
-1, littler more than 40 times than the acoustic impedance of piezoelectricity wafer, so can make transmissivity improve nearly 40 times; Silicon rubber sound focusing lens can make the sound field energy focusing, thereby further improve the probe transmissivity.
Owing to adopted the magnesium alloy matching layer, its acoustic impedance only is about 1/3 of a general piezoelectric crystal material, and the acoustic wave transmission rate that the new detector is sent improves 3 times; Because magnesium alloy has good plasticity, and is frangible unlike piezoelectric chip, can improve the impact resistance and the serviceable life of probe as matching layer, thereby play the certain protection effect.Therefore can be with the reduced thickness of piezoelectric chip, diameter increases.The piezoelectric chip reduced thickness can improve ultrasonic frequency, and frequency can be brought up to 2.5MHz by the 1.25MHz of ordinary ultrasonic probe, thereby increases detection sensitivity.Probe diameter can be brought up to about 30mm about the 15mm by ordinary ultrasonic probe, the area of piezoelectric chip has increased by 4 times, because the intensity of ultrasonic field is directly proportional with the area approximation of piezoelectric chip, so the comparable again prior art probe of the acoustic wave transmission rate of the new detector improves several times; Magnesium alloy plasticity is good, and very easily processing can effectively guarantee the dimensional accuracy of matching layer with the matching layer of its processing, and its price is cheap again a lot of than piezoelectric chip, makes the manufacturing cost of probe descend many.
Below in conjunction with drawings and Examples the utility model is described in further detail.
Description of drawings
Fig. 1 is the utility model structural representation
Fig. 2 is the prior art structural representation
Among the figure, the 1-concentric cable, the 2-metal shell, 3-absorbs piece, 4-piezoelectric chip, 5-insulation sleeve, 6-matching layer, 7-sound focusing lens, 9-annular preform, 10-screw
Embodiment
With reference to Fig. 1, air ultrasound probe is by concentric cable 1, metal shell 2, absorb piece 3, piezoelectric chip 4, insulation sleeve 5 constitutes on the basis of conventional ultrasound probe, at conventional ultrasound probe end face applying one deck matching layer 6, add last layer sound focusing lens 7 on matching layer 6 surfaces again, with metal ring compressing tablet 9 matching layer 6 harmony condenser lenses 7 are pressed on the surface of conventional ultrasound probe piezoelectric chip 4, symmetrically metal ring compressing tablet 9, matching layer 6 harmony condenser lenses 7 are linked together with metal shell 2 with 4 pieces of screws 10 again.
Because acoustic impedance Z=1.04 * 10 of silicon rubber
6Kgm
-2s
-1, littler more than 40 times than the acoustic impedance of piezoelectricity wafer 4, so can make transmissivity improve nearly more than 40 times.After making sound focusing lens 7 with it, because its focussing force, make the sound field energy focusing again, thereby further improve the probe transmissivity.
Matching layer 6 choose magnesium alloy be because: matching layer 6 is selected magnesium alloy for use, and its acoustic impedance only be about 1/3 of a general piezoelectric crystal material, can make 3 times of the acoustic wave transmission rate raisings that the new detector sends; Because magnesium alloy has good plasticity, and is frangible unlike piezoelectric chip, can improve the impact resistance and the serviceable life of probe as matching layer, thereby play the certain protection effect.Therefore can be with the reduced thickness of piezoelectric chip, diameter increases.The piezoelectric chip reduced thickness can improve ultrasonic frequency, and frequency can be brought up to 2.5MHz by the 1.25MHz of ordinary ultrasonic probe, thereby increases detection sensitivity.Probe diameter can be brought up to about 30mm about the 15mm by ordinary ultrasonic probe, the area of piezoelectric chip has increased by 4 times, because the intensity of ultrasonic field is directly proportional with the area approximation of piezoelectric chip, so the comparable again prior art probe of the acoustic wave transmission rate of the new detector improves several times; Magnesium alloy plasticity is good, and very easily processing can effectively guarantee the dimensional accuracy of matching layer with the matching layer of its processing, and its price is cheap again a lot of than piezoelectric chip, makes the manufacturing cost of probe descend many.
Matching layer 6 selects for use magnesium alloy to make its thickness δ
MgCan choose 1～2mm any thickness.
Sound focusing lens 7 select for use silicon rubber to be made.The thick degree δ that presses at its middle part
Silicon rubberCan choose 3～4.5mm any thickness.Choosing mainly of radius of curvature R decided according to the distance that detects workpiece of popping one's head in to, for improving detection sensitivity, and should be as much as possible little.
By matching layer 6 harmony condenser lenses 7, make the piezoelectric chip 4 and the acoustic impedance of air comparatively mate, thereby make transmissivity improve tens, even hundreds of times.
When the pulse voltage amplitude that is added in piezoelectric chip 4 both sides is brought up to 1600V by 650V, because hyperacoustic sound field intensity is directly proportional with the diameter and the pulse voltage amplitude of piezoelectric chip 4, adding the sound focusing lens focuses on acoustic energy beam, therefore, can make the ultrasonic energy of injecting tested work increase by tens even nearly a hundred times at least.Thereby this utility model probe can realize that air ultrasound detects.
Claims (3)
1, a kind of air ultrasound probe, comprise concentric cable (1), metal shell (2), absorb piece (3), piezoelectric chip (4) and insulation sleeve (5), it is characterized in that: also comprise matching layer (6), sound focusing lens (7), annular preform (9), be close to piezoelectric chip (4) in the middle of matching layer (6) upper surface, sound focusing lens (7) are close to matching layer (6), with metal ring compressing tablet (9) sound focusing lens (7) and matching layer (6) are pressed on the surface of piezoelectric chip (4), use some pieces of screws (10) with metal ring compressing tablet (9) again, matching layer (6) harmony condenser lens (7) links together with metal shell (2).
2, air ultrasound probe according to claim 1, it is characterized in that: described sound focusing lens (7) adopt silicon rubber, and the external diameter of its installation same metal shell of diameter (2) etc. are big, and the diameter of the same piezoelectric chip of effective diameter (4) etc. are big, be 15～30mm, interior thickness is 3～4.5mm.
3, air ultrasound probe according to claim 1, it is characterized in that: described matching layer (6) adopts magnesium alloy, and the external diameters of the same metal shell of its diameter (2) etc. are big, and thickness is 1～2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520078774 CN2789767Y (en) | 2005-05-16 | 2005-05-16 | Air ultrasound probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520078774 CN2789767Y (en) | 2005-05-16 | 2005-05-16 | Air ultrasound probe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2789767Y true CN2789767Y (en) | 2006-06-21 |
Family
ID=36790101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520078774 Expired - Fee Related CN2789767Y (en) | 2005-05-16 | 2005-05-16 | Air ultrasound probe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2789767Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102854255A (en) * | 2011-06-30 | 2013-01-02 | 上海宝钢工业检测公司 | Combined water immersed probe for ultrasonic detection |
| CN103549977A (en) * | 2013-11-05 | 2014-02-05 | 深圳大学 | Transcranial Doppler plane annular phased array probe |
| CN103959817A (en) * | 2011-11-28 | 2014-07-30 | 株式会社村田制作所 | Stacked piezoelectric element and resend detection sensor |
| CN101750454B (en) * | 2008-12-18 | 2015-08-05 | 诺沃皮尼奥内有限公司 | For ultrasound inspection methods and the related probes of noise founding materials |
-
2005
- 2005-05-16 CN CN 200520078774 patent/CN2789767Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101750454B (en) * | 2008-12-18 | 2015-08-05 | 诺沃皮尼奥内有限公司 | For ultrasound inspection methods and the related probes of noise founding materials |
| CN102854255A (en) * | 2011-06-30 | 2013-01-02 | 上海宝钢工业检测公司 | Combined water immersed probe for ultrasonic detection |
| CN103959817A (en) * | 2011-11-28 | 2014-07-30 | 株式会社村田制作所 | Stacked piezoelectric element and resend detection sensor |
| CN103959817B (en) * | 2011-11-28 | 2016-12-14 | 株式会社村田制作所 | Piezoelektrisches mehrschichtelement and send detecting sensor again |
| CN103549977A (en) * | 2013-11-05 | 2014-02-05 | 深圳大学 | Transcranial Doppler plane annular phased array probe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060621 |