CN104785429B - Piezoelectric ultrasonic transducer with acoustic feedback function - Google Patents
Piezoelectric ultrasonic transducer with acoustic feedback function Download PDFInfo
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- CN104785429B CN104785429B CN201510056860.1A CN201510056860A CN104785429B CN 104785429 B CN104785429 B CN 104785429B CN 201510056860 A CN201510056860 A CN 201510056860A CN 104785429 B CN104785429 B CN 104785429B
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- 239000000919 ceramic Substances 0.000 claims abstract description 60
- 238000003825 pressing Methods 0.000 claims abstract description 28
- 238000001514 detection method Methods 0.000 claims description 23
- 239000007769 metal material Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The invention discloses a piezoelectric ultrasonic transducer with the acoustic feedback function. The piezoelectric ultrasonic transducer with the acoustic feedback function comprises pre-tightening-force screws, a middle pressing block, an emitting piezoelectric ceramic element and a front pressing block, wherein the middle pressing block and the front pressing block are arranged at the two ends of the emitting piezoelectric ceramic element, the other end of the middle pressing block is further provided with a detecting piezoelectric ceramic element with the structure totally consistent with that of the emitting piezoelectric ceramic element, the other end of the detecting piezoelectric ceramic element is further provided with a rear pressing block, and the front pressing block, the middle pressing block and the rear pressing block press the emitting piezoelectric ceramic element and the detecting piezoelectric ceramic element through the pre-tightening-force screws; the detecting piezoelectric ceramic element is connected with an ultrasonic power source detecting circuit through an electrode element. The detecting piezoelectric ceramic element is used for generating vibration with the frequency the same as that of vibration on the outlet of the ultrasonic transducer, the ultrasonic power source detecting circuit is used for detecting the vibration of the outlet of the ultrasonic transducer so that whether the ultrasonic transducer works at a resonant frequency with the maximum amplitude can be fast judged, the judgment method is simple, and operation is very easy.
Description
Technical field
The present invention relates to piezoelectric type ultrasonic transducer, relate to the technology of frequency tracking of ultrasonic transmitter, in particular,
Relate to a kind of piezoelectric-type ultrasonic wave transducer with acoustic feedback function.
Background technology
Transducer is to utilize the device that the piezoelectricity of piezoquartz (ceramic) realizes electric energy, mechanical energy is exchanged.Ultrasonic change
Energy device, only when resonance occurs, could outwards launch powerful ultrasound wave.Piezoelectric ceramics transducing in resonant frequency range
The model of device can represent with the equivalent circuit of Fig. 2:
C0For direct capacitance, be transducer in the case of not vibration, two interelectrode capacitances, its size and pressure
The dielectric constant of electroceramics (or crystal), length and width, thickness are relevant, and the general order of magnitude is 10-9F.R is the medium in piezoelectric ceramic piece
Electrical loss, generally can ignore its impact and (it is generally acknowledged R0For infinity).
When transducer vibrations sends ultrasound wave, there is also motional impedance, by transducer itself with medium to vibration
Retroaction produces.When medium is air, it is negligible to the retroaction of vibration, and motional impedance can use resistance, electricity
Holding, the series connection of inductance represents.Lm, Cm, Rm represent the equivalent inductance of equivalent circuit when transducer is non-loaded respectively, equivalent capacity,
Equivalent resistance.Lm is equivalent to the inertia of wafer vibration, and the general order of magnitude is 10-3H；Cm is equivalent to the elasticity of wafer vibration, typically
The order of magnitude is 10-12F；It is Ω that Rm is equivalent to the general order of magnitude of frictional dissipation when wafer vibrates.
The resultant admittance of equivalent circuit of transducer, Y is represented with Y0Represent admittance,static and motional admittance with Ym, have:
Y=Y0+Ym=G+jB wherein G, B are total conductance and total susceptance
Can prove that
Wherein ω is to be added in the angular frequency of alternating current on transducer electrode
Rate
In resonance frequency omegacNear, ω can be approximately consideredcC0=ω C0, such transducer admittance is changed to figure with frequency
Shown in 3 a circle.This figure can obtain many important parameters of transducer:
Fs series resonance frequency, in equivalent circuit of piezoelectric resonator, the resonant frequency of series arm is (in admittance circle diagram 2
At big conductance)
Fp parallel resonance frequency, after equivalent circuit of piezoelectric resonator carries out connection in series-parallel equivalent transformation, parallel branch humorous
Vibration frequency (in impedance circle diagram at maximum resistance, this specification does not provides impedance circle diagram)
Fm maximum admittance frequency, frequency during piezoelectric vibrator admittance maximum is referred to as maximum admittance frequency
Fn minimum addittance frequency, frequency during piezoelectric vibrator admittance minimum is referred to as maximum admittance frequency
Fr resonant frequency, makes a relatively low frequency in a pair frequency that susceptance is zero of piezoelectric vibrator be referred to as resonance
Frequency
Fa anti-resonance frequency, makes a frequency higher in a pair frequency that susceptance is zero of piezoelectric vibrator
During transducer zero load, there is following relation: f in six characteristic frequencyesm=fs=fr,fa=fp=fn
Have after loading: fm<fs<fr,fa<fp<fn,fs<fp
In these 6 characteristic frequencyes, maximum admittance frequency fm and minimum addittance frequency fn can record by Transmission line method, resonance
Frequency fr and anti-resonance frequency fa can draw by observing resonance point i.e. electric current and the same phase point of voltage waveform.
Only series resonance frequency fs and parallel resonance frequency fp directly cannot be measured by simple method, and the two frequency
Rate has important effect in parameter calculating, performance evaluation and the impedance matching of transducer.
Ultrasonic washing unit is operated in transducer series resonance frequency more, can improve the power output of ultrasonic-frequency power supply.
Transducer is operated in parallel resonance frequency, and its output can be automatically adjusted according to loading condition, is suitable for
Ultra-sonic welded and pulverizing.
Ultrasonic system resonant frequency with series resonance frequency work should be near series resonance frequency, with parallel resonance frequency
The ultrasonic system resonant frequency of rate work should be near parallel resonance frequency.
The technology of frequency tracking of ultrasonic power, uses electricity feedback transmitter, aging because of load change, transducer in resonant frequency
When drifting about etc. reason, after gathering coupling inductance counteracting transducer capacitive, the voltage and current of transducer system, according to its phase place
Difference, changes ultrasonic frequency, to reach the purpose being positioned near resonant frequency.
The present invention uses acoustic feedback, invents a kind of transducer having both acoustic emission and accepting function, directly uses machinery
The signal that vibration produces, allows ultrasonic frequency be positioned at transducer peak swing frequency.
Summary of the invention
It is an object of the invention to solve mechanical resonant frequency in prior art and gather inconvenient problem, it is provided that be a kind of
Judge that Oscillation Amplitude signal is simple, and can interpolate that whether transducer is operated in the one of the maximum resonant frequency of amplitude and has sound
The piezoelectric-type ultrasonic wave transducer of feedback function.
To achieve these goals, the technical solution used in the present invention is:
A kind of piezoelectric-type ultrasonic wave transducer with acoustic feedback function, including pretightning force screw, intermediate pressing block, transmitting pressure
Electroceramics element and front briquetting, described intermediate pressing block and front briquetting are located at the two ends of transmitting piezoelectric ceramic element, described intermediate pressure
The block other end is additionally provided with and constructs on all four detection piezo ceramic element, described intermediate pressure with above-mentioned transmitting piezoelectric ceramic element
Block and front briquetting size shape are completely the same, and the other end of described detection piezo ceramic element is additionally provided with rear briquetting, described front pressure
Transmitting piezoelectric ceramic element and detection piezo ceramic element are compressed by block, intermediate pressing block and rear briquetting by pretightning force screw；Institute
State and be respectively equipped with electrode member, on described detection piezo ceramic element on transmitting piezoelectric ceramic element and detection piezo ceramic element
Electrode member be connected to detect ultrasonic amplitude ultrasonic power testing circuit.Transmitting piezoelectric ceramic element and detection pressure
Electroceramics element is the piezoelectric using parameter identical, and wherein transmitting piezoelectric ceramic element is used for receiving ultrasonic power driving
Signal, to produce vibration, detection piezo ceramic element is used for bearing vibration, produces signal, and utilizes the signal of generation by super
Sound wave power sense circuit detects, to judge whether above-mentioned ultrasonic transducer is operated in the resonant frequency that amplitude is maximum.
Further, the electrode member on described transmitting piezoelectric ceramic element connects ultrasonic power and drives signal, is used for
Transmitting piezoelectric ceramic element produces vibration.
Further, described intermediate pressing block is a length of ultrasonic wavelength half and the briquetting being made up of metal material.This
Sample can make the piezoelectric material vibration amplitude of generation signal close to maximum, improves sensitivity.
Piezoelectric be clipped in before, during and after between briquetting, by bolt presses, to ensure that piezoelectric is operated in pressurized shape
State, it is to avoid tension crushes.
Compared with prior art, advantages of the present invention is as follows: present configuration is the compactest, and production cost is low；Utilization sets
Detection piezo ceramic element at the intermediate pressing block other end produces the vibration identical with ultrasonic transducer exit frequency of vibration,
And by ultrasonic power testing circuit, its vibration is detected, to realize whether ultrasonic transducer is operated in amplitude maximum
The quick judgement of resonant frequency, its determination methods simply and easily operates.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of piezoelectric-type ultrasonic wave transducer with acoustic feedback function of the present invention.
Fig. 2 is the equivalent circuit diagram of transducer in prior art.
Fig. 3 is the dmittance chart of transducer in prior art.
In figure, press after briquetting, 2-transmitting piezoelectric ceramic element, 3-intermediate pressing block, 4-detection piezo ceramic element, 5-before 1-
Block, 6-pretightning force screw.
Detailed description of the invention
The invention will be further described below in conjunction with the accompanying drawings:
As it is shown in figure 1, a kind of piezoelectric-type ultrasonic wave transducer with acoustic feedback function, including pretightning force screw 6, centre
Briquetting 3, transmitting piezoelectric ceramic element 2 and front briquetting 1, described intermediate pressing block 3 and front briquetting 1 are located at transmitting piezoelectric ceramic element 2
Two ends, described intermediate pressing block 3 other end is additionally provided with and constructs on all four detection piezoelectricity with above-mentioned transmitting piezoelectric ceramic element 2
Ceramic component 4, described intermediate pressing block 3 and front briquetting 1 size shape are completely the same, another of described detection piezo ceramic element 4
End is additionally provided with rear briquetting 5, and described front briquetting 1, intermediate pressing block 3 and rear briquetting 5 are first by transmitting piezoelectric ceramic by pretightning force screw 6
Part 2 and detection piezo ceramic element 4 compress；It is respectively equipped with on described transmitting piezoelectric ceramic element 2 and detection piezo ceramic element 4
Electrode member, the electrode member on described detection piezo ceramic element 4 is connected to detect the ultrasonic power of ultrasonic amplitude
Testing circuit.Transmitting piezoelectric ceramic element 2 is the piezoelectric using parameter identical with detection piezo ceramic element 4, Qi Zhongfa
Penetrating piezo ceramic element 2 and drive signal for receiving ultrasonic power, to produce vibration, detection piezo ceramic element 4 is used for holding
Vibrated, produce signal, and utilize the signal of generation to be detected by ultrasonic power testing circuit, above-mentioned ultrasonic to judge
Whether wave transducer is operated in the resonant frequency that amplitude is maximum.
Electrode member on described transmitting piezoelectric ceramic element connects ultrasonic power and drives signal, makes pottery for transmission piezoelectric
Porcelain element produces vibration.
Described intermediate pressing block is a length of ultrasonic wavelength half and the briquetting being made up of metal material.So can make product
The piezoelectric material vibration amplitude of raw signal, close to maximum, improves sensitivity.
Piezoelectric be clipped in before, during and after between briquetting, by bolt presses, to ensure that piezoelectric is operated in pressurized shape
State, it is to avoid tension crushes.
The transmitting piezoelectric ceramic element producing vibration connects ultrasonic power driving signal, i.e. ultrasonic-frequency power supply, in pumping signal
Producing ultrasonic mechanical vibration under effect, these mechanical vibration radiate to the two ends of transmitting piezoelectric ceramic element；Its forward end Department of Radiation
Divide by front briquetting to external radiation, complete the function of liquid ultrasonic cavitation；Radiant section is driven by intermediate pressing block and holds to the back-end
Vibrated detection piezo ceramic element, detection piezo ceramic element produces the signal of telecommunication of reaction Oscillation Amplitude, and output is to ultrasonic
Ripple power sense circuit detects, and utilizes its testing result to drive signal to carry out feedback control ultrasonic power, it is achieved
Ultrasonic power drives the peak swing location of signal.The a length of half-wavelength of intermediate pressing block, when its objective is acoustic reflection, can fold
Add formation standing wave so that metal platen left and right both ends of the surface Oscillation Amplitude, close to maximum, detects the telecommunications of piezo ceramic element output
Number close to maximum, improve sensitivity.
Above-described embodiment is presently preferred embodiments of the present invention, is not the restriction to technical solution of the present invention, as long as
The technical scheme that can realize on the basis of above-described embodiment without creative work, is regarded as falling into patent of the present invention
Rights protection in the range of.
Claims (3)
1. there is a piezoelectric-type ultrasonic wave transducer for acoustic feedback function, including pretightning force screw (6), intermediate pressing block (3), send out
Penetrate piezo ceramic element (2) and front briquetting (1), described intermediate pressing block (3) and front briquetting (1) and be located at transmitting piezoelectric ceramic element
(2) two ends, it is characterised in that: described intermediate pressing block (3) other end is additionally provided with and constructs with above-mentioned transmitting piezoelectric ceramic element (2)
On all four detection piezo ceramic element (4), described intermediate pressing block (3) and front briquetting (1) size shape are completely the same, described
The other end of detection piezo ceramic element (4) is additionally provided with rear briquetting (5), described front briquetting (1), intermediate pressing block (3) and rear briquetting
(5) by pretightning force screw (6), transmitting piezoelectric ceramic element (2) and detection piezo ceramic element (4) are compressed；Described transmitting presses
It is respectively equipped with electrode member, described detection piezo ceramic element (4) on electroceramics element (2) and detection piezo ceramic element (4)
On electrode member be connected to detect ultrasonic amplitude ultrasonic power testing circuit.
A kind of piezoelectric-type ultrasonic wave transducer with acoustic feedback function the most according to claim 1, it is characterised in that: institute
State the electrode member on transmitting piezoelectric ceramic element (2) and connect ultrasonic power driving signal, for transmitting piezoelectric ceramic element
(2) vibration is produced.
A kind of piezoelectric-type ultrasonic wave transducer with acoustic feedback function the most according to claim 1, it is characterised in that: institute
Stating intermediate pressing block (3) is a length of ultrasonic wavelength half and the briquetting being made up of metal material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510056860.1A CN104785429B (en) | 2015-02-03 | 2015-02-03 | Piezoelectric ultrasonic transducer with acoustic feedback function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510056860.1A CN104785429B (en) | 2015-02-03 | 2015-02-03 | Piezoelectric ultrasonic transducer with acoustic feedback function |
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| Publication Number | Publication Date |
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| CN104785429A CN104785429A (en) | 2015-07-22 |
| CN104785429B true CN104785429B (en) | 2017-01-11 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105080821B (en) * | 2015-08-19 | 2018-01-26 | 杭州成功超声设备有限公司 | A kind of ultrasonic transducer with quantitative amplitude reponse system |
| CN106209011A (en) * | 2016-08-01 | 2016-12-07 | 陕西师范大学 | Acoustic impedance match device and method based on piezoelectric effect |
| CN106533249A (en) * | 2016-12-05 | 2017-03-22 | 同济大学 | Online miniature vibration table |
| CN107191442B (en) * | 2017-05-26 | 2023-11-03 | 哈尔滨龙声超声技术有限公司 | Method and device for reducing air resistance of high-speed object based on power ultrasound |
| US20190143610A1 (en) * | 2017-11-15 | 2019-05-16 | Branson Ultrasonics Corporation | Method And Apparatus For Detection Of Loose Stack Joints And Cracked Components Of Ultrasonic Stacks |
| CN107694892A (en) * | 2017-11-17 | 2018-02-16 | 杭州成功超声设备有限公司 | A kind of bar type ultrasonic system structure of super high power |
| AU2018385759B2 (en) * | 2017-12-14 | 2021-10-21 | Flodesign Sonics, Inc. | Acoustic transducer driver and controller |
| CN109909533A (en) * | 2019-04-22 | 2019-06-21 | 上海应用技术大学 | A kind of intelligence longitudinal-torsional composite ultrasonic milling attachment |
| CN113019870A (en) * | 2019-12-24 | 2021-06-25 | 深圳开立生物医疗科技股份有限公司 | Method and device for tracking resonant frequency of ultrasonic transducer and related equipment |
| CN117506109A (en) * | 2023-12-22 | 2024-02-06 | 广东工程职业技术学院 | Method for improving welding power and stability of digital ultrasonic welding power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6016821A (en) * | 1996-09-24 | 2000-01-25 | Puskas; William L. | Systems and methods for ultrasonically processing delicate parts |
| US8181533B2 (en) * | 2010-01-06 | 2012-05-22 | Daniel Measurement And Control, Inc. | Ultrasonic flow meter and transducer assembly with isolated transformer capsule |
| KR20120063345A (en) * | 2010-12-07 | 2012-06-15 | 삼성전기주식회사 | Haptic driving assembly and electronic device using the same |
| CN202855401U (en) * | 2012-09-20 | 2013-04-03 | 张家港睿能科技有限公司 | Cable and ultrasonic vibration device using cable |
| CN204523451U (en) * | 2015-02-03 | 2015-08-05 | 浙江工业大学 | A kind of piezoelectric-type ultrasonic wave transducer with acoustic feedback function |
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