CN202614728U - Novel air ultrasonic probe used for contactless detection - Google Patents
Novel air ultrasonic probe used for contactless detection Download PDFInfo
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- CN202614728U CN202614728U CN 201220269258 CN201220269258U CN202614728U CN 202614728 U CN202614728 U CN 202614728U CN 201220269258 CN201220269258 CN 201220269258 CN 201220269258 U CN201220269258 U CN 201220269258U CN 202614728 U CN202614728 U CN 202614728U
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- matching layer
- focusing lens
- diameter
- sound focusing
- piezoelectric chip
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Abstract
The utility model relates to a novel air ultrasonic probe used for contactless detection. The probe comprises a coaxial cable, a metal casing, an absorption block, a piezoelectric wafer, an insulation sleeve, a matching layer, a sound focusing lens and annular press sheets. The middle of the upper end surface of the matching layer is attached to the piezoelectric wafer tightly, and the sound focusing lens is attached to the matching layer tightly. The metal annular press sheets are used for pressing the sound focusing lens and the matching layer tightly on the surface of the piezoelectric wafer, and then a plurality of screws are used for connecting the metal annular press sheets, the matching layer and the sound focusing lens with the metal casing. The sound focusing lens is made of silicon rubber, the mounting diameter of the sound focusing lens is equal to the outer diameter of the metal casing, and the effective diameter of the sound focusing lens is equal to the diameter of the piezoelectric wafer. The matching layer is made of magnesium alloy, and the diameter is equal to the diameter of the metal casing. According to the novel air ultrasonic probe used for contactless detection, the transmissivity is improved by nearly 40 times due to the utilization of the silicon rubber sound focusing lens and the magnesium alloy matching layer.
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 receive ultrasound wave return, 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 seized 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 lean on couplant to contact with measured object, 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 ultrasound 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 utility model solves the technical scheme that its technical matters adopted: a kind of air ultrasound probe comprises concentric cable 1, metal shell 2; Absorb piece 3; Piezoelectric chip 4 and insulation sleeve 5 is characterized in that: also comprise matching layer 6, sound focusing lens 7; Be close to piezoelectric chip 4 in the middle of the annular preform 9, 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, with some pieces of screws 10 metal ring compressing tablet 9, matching layer 6 harmony condenser lenses 7 and metal shell 2 are linked together again.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.Described matching layer 6 adopts magnesium alloys, and its diameter is big with the external diameter of metal shell 2 etc.
The advantage that the utility model is compared prior art 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 magnesium alloy matching layer, its acoustic impedance to be merely about 1/3 of general piezoelectric crystal material, 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 accompanying drawing and embodiment the utility model is done further explain.
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, and metal shell 2 absorbs 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, adds 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 is merely about 1/3 of general piezoelectric crystal material, can make the acoustic wave transmission rate that the new detector sends improve 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.
Matching layer 6 selects for use magnesium alloy to make its thickness δ
MgCan choose 1～2mm any thickness.
Through 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 bringing up to 1600V to the pulse voltage amplitude that is added in piezoelectric chip 4 both sides 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 seized work increase by tens even nearly a hundred times at least.Thereby this utility model probe can realize that air ultrasound detects.
Claims (1)
1. a novel air ultrasonic probe that is used for non-contact detection is characterized in that: comprise concentric cable (1), metal shell (2); Absorb piece (3), piezoelectric chip (4), insulation sleeve (5); Matching layer (6), sound focusing lens (7), annular preform (9); Be close to piezoelectric chip (4) in the middle of (6) end face on the matching layer, sound focusing lens (7) are close to matching layer (6), sound focusing lens (7) and matching layer (6) are pressed on the surface of piezoelectric chip (4) with metal ring compressing tablet (9); Use some pieces of screws (10) that metal ring compressing tablet (9), matching layer (6) harmony condenser lens (7) are linked together with metal shell (2) again; 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; Described matching layer (6) adopts magnesium alloy, and the diameter of the same metal shell of its diameter (2) etc. are big.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220269258 CN202614728U (en) | 2012-06-08 | 2012-06-08 | Novel air ultrasonic probe used for contactless detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220269258 CN202614728U (en) | 2012-06-08 | 2012-06-08 | Novel air ultrasonic probe used for contactless detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202614728U true CN202614728U (en) | 2012-12-19 |
Family
ID=47348417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220269258 Expired - Fee Related CN202614728U (en) | 2012-06-08 | 2012-06-08 | Novel air ultrasonic probe used for contactless detection |
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| CN (1) | CN202614728U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108061758A (en) * | 2017-12-05 | 2018-05-22 | 马鞍山钢铁股份有限公司 | A kind of wheel-tyre ultrasonic probe |
| CN108982669A (en) * | 2018-08-02 | 2018-12-11 | 中北大学 | A kind of an inscription on a tablet recognition methods based on Air Coupling ultrasound |
| CN109187757A (en) * | 2018-08-02 | 2019-01-11 | 中北大学 | An inscription on a tablet identification device based on Air Coupling ultrasound |
-
2012
- 2012-06-08 CN CN 201220269258 patent/CN202614728U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108061758A (en) * | 2017-12-05 | 2018-05-22 | 马鞍山钢铁股份有限公司 | A kind of wheel-tyre ultrasonic probe |
| CN108982669A (en) * | 2018-08-02 | 2018-12-11 | 中北大学 | A kind of an inscription on a tablet recognition methods based on Air Coupling ultrasound |
| CN109187757A (en) * | 2018-08-02 | 2019-01-11 | 中北大学 | An inscription on a tablet identification device based on Air Coupling ultrasound |
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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: 20121219 Termination date: 20130608 |