CN1331617C - Novel broad band super sound piezoelectric compound transducer - Google Patents
Novel broad band super sound piezoelectric compound transducer Download PDFInfo
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- CN1331617C CN1331617C CNB2004101017311A CN200410101731A CN1331617C CN 1331617 C CN1331617 C CN 1331617C CN B2004101017311 A CNB2004101017311 A CN B2004101017311A CN 200410101731 A CN200410101731 A CN 200410101731A CN 1331617 C CN1331617 C CN 1331617C
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- end cap
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Abstract
The present invention relates to an underwater sound wideband receiving or transmitting transducer used for ships and submarines, which belongs to the technical field of piezoelectricity and sensitivity. The novel wideband supersound piezoelectric compound transducer of the present invention comprises a piezoelectric ceramic sheet, an upper end cap electrode and a lower end cap electrode, wherein the upper end cap electrode and the lower end cap electrode are bonded on the piezoelectric ceramic sheet. On the premise of not changing the basic structure of the transducer, the different material thickness of the two end cap electrodes is adopted to realize the novel wideband supersound piezoelectric compound transducer. The present invention has the advantages that the structure dissymmetry phenomenon is fully utilized, the requirement of particular work bandwidth is achieved, and the design is simplified.
Description
Affiliated technical field
The invention belongs to piezoelectricity and sensitive technology field.Utilize piezoelectric device to carry out the field of mechanical quantity, acoustic signal measurement, it is mainly used in the underwater sound broadband reception or the transmitting transducer of naval vessel, submarine.
Background technology
The excess sound pressure of prior art is replied by cable and closed transducer is the arch circle cap electrode that each bonding a slice thickness is identical in the piezoelectric ceramic piece both sides, constitutes metal---piezoelectric ceramics composite transducer.It is this special shape that utilizes metal end caps, with the conversion of the piezo-electric traverse effect of piezoelectric ceramic piece and zoom into longitudinal piezoelectric effect, makes the equivalent piezoelectric constant of transducer increase.This device document record is a lot, for example European patent EP-238187 " cymbals formula contact microphone ", German patent DE 3508719 " cymbals formula sound pick-up ", world patent WO200119136 " electroacoustic transducer ", they have all related to the piezoelectricity composite transducer of this kind form.Because upper and lower two electrodes are bonding and the asymmetry of the physical dimension of element, can cause that transducer produces multi resonant and shakes, what this person of being to use did not expect.
Summary of the invention
Purpose of the present invention is utilized metal---the asymmetrical characteristic of upper and lower two electrode structures of piezoelectric ceramics composite transducer, design a kind of higher piezoelectricity that can keep this kind structure transducer, can produce practicality, the simple broad band super sound piezoelectric compound transducer of technology again, be used for wideband-short pulse and receive or transmitting transducer.
For achieving the above object, broad band super sound piezoelectric compound transducer of the present invention comprises piezoelectric ceramic piece and the upper end cap electrode, the lower end cap electrode that are bonded on the piezoelectric ceramic piece, it is characterized in that: the upper end cap electrode thickness t
B1With the lower end cap electrode thickness t
B2Inequality, t wherein
B1And t
B2Span be 0.15mm～0.59mm.
The first resonant frequency of operation f when broad band super sound piezoelectric compound transducer of the present invention
B1With the second resonant frequency of operation f
B2After determining, i.e. bandwidth deltaf f
B=f
B2-f
B1After determining, end cap electrode material thickness difference Δ t
bCan be according to following formula
f
B2＝B·Δt
b+f
B1 (1)
Calculate, thereby can obtain another one end cap thickness of electrode according to a known end cap thickness of electrode.
B is an experimental constant in the formula, it obtains like this: when upper/lower electrode thickness is a1, record a resonant frequency f1, when upper/lower electrode thickness is a2, record a resonant frequency f2, then B is | f1-f2| and | the ratio between the a1-a2|, this is because the material thickness of the size of resonant frequency and upper and lower end cap electrode is linear, so this ratio is a constant, f
B1Be the material thickness of upper end cap electrode and lower end cap electrode first resonant frequency of operation when identical.
Technical scheme of the present invention further comprises the upper end cap electrode thickness t
B1Less than the lower end cap electrode thickness t
B2, or the upper end cap electrode thickness t
B1Greater than the lower end cap electrode thickness t
B2Situation.
The advantage of broad band super sound piezoelectric compound transducer of the present invention is:
1) made full use of the structure asymmetry, realized the requirement of particular job bandwidth, under the prerequisite that does not change this transducer basic structure, only change the material thickness of upper and lower end cap electrode, make the upper and lower end cap electrode when work, produce two different resonant frequencies.
2) this programme makes the simplicity of designization of broad band super sound piezoelectric compound transducer, when actual design, as long as measure the resonant frequency of the transducer of two different end cap electrode material thickness, just can determine the coefficient B in the correlation formula, thereby design needed wide-band transducer.
3) because this programme does not change the basic structure of transducer, therefore, the piezoelectric modulus of transducer itself does not change, and preparation method does not change, and manufacture craft still keeps original method, and is simple.
Description of drawings
Fig. 1 becomes end cap thickness of electrode structural section figure for broad band super sound piezoelectric compound transducer.
Specific embodiments
Below in conjunction with drawings and Examples broad band super sound piezoelectric compound transducer of the present invention is done and to be described in further detail.
First embodiment of broad band super sound piezoelectric compound transducer of the present invention is the different materials thickness that adopts the two ends cap electrode, and the upper and lower end cap inner chamber degree of depth is identical, it is characterized in that: upper end cap electrode 2 thickness t
B1Less than lower end cap electrode 3 thickness t
B2, t wherein
B1And t
B2Span be 0.15mm～0.59mm.
The first resonant frequency of operation f when broad band super sound piezoelectric compound transducer of the present invention
B1With the second resonant frequency of operation f
B2After determining, i.e. bandwidth deltaf f
B=f
B2-f
B1After determining, end cap electrode material thickness difference Δ t
bCan calculate according to formula (1), thereby can obtain another one end cap thickness of electrode according to a known end cap thickness of electrode.
B is an experimental constant in the formula, it obtains like this: when upper/lower electrode thickness is a1, record a resonant frequency f1, when upper/lower electrode thickness is a2, record a resonant frequency f2, then B is | f1-f2| and | the ratio between the a1-a2|, this is because the material thickness of the size of resonant frequency and upper and lower end cap electrode is linear, so this ratio is a constant, f
B1Be the material thickness of upper end cap electrode 2 and lower end cap electrode 3 first resonant frequency of operation when identical.
Given following parameter:
The thickness t of piezoelectric ceramic piece 1
pThe diameter d of=1mm, piezoelectric ceramic piece 1
p=12mm, end cap electrode 2 and 3 intracavity diameter d
E2=9mm, end cap electrode 2 and 3 top end diameter d
E1=3mm, end cap electrode 2 and 3 inner chamber degree of depth t
eDuring=0.5mm, f
B1(upper and lower end cap electrode material thickness all is t to=33KHz
B1=0.15mm), during B=52KHz/mm, if design bandwidth Δ f
B=7KHz, i.e. f
B2=40KHz can obtain Δ t according to formula (1)
b=0.1mm, i.e. t
B2=t
B1+ Δ t
b=0.25mm can obtain the thickness t of lower end cap electrode 3 like this
B2
Second embodiment of broad band super sound piezoelectric compound transducer of the present invention is when other condition is identical with first embodiment, if design bandwidth Δ f
B=13KHz, i.e. f
B2=46KHz can obtain Δ t according to formula (1)
b=0.25mm, i.e. t
B2=t
B1+ Δ t
b=0.4mm can obtain the thickness t of lower end cap electrode 3 like this
B2
The 3rd embodiment of broad band super sound piezoelectric compound transducer of the present invention is when other condition is identical with first embodiment, if design bandwidth Δ f
B=23KHz, i.e. f
B2=56KHz can obtain Δ t according to formula (1)
b=0.44mm, i.e. t
B2=t
B1+ Δ t
b=0.59mm can obtain the thickness t of lower end cap electrode 3 like this
B2
The 4th enforcement of broad band super sound piezoelectric compound transducer of the present invention also is to adopt the different scheme of two ends cap electrode material thickness, be upper end cap electrode 2 material thicknesses greater than lower end cap electrode 3 material thicknesses with above three embodiment differences, other is identical with first embodiment.Therefore, repeat no more.
Above-mentioned four kinds of embodiment are at given bandwidth deltaf f
BThereby, calculate another end cap electrode t
B2Thickness.Also can set end cap electrode t earlier
B2Thickness, thereby calculate corresponding bandwidth Δ f
B
Above-mentioned several embodiment obtains under the top end diameter situation of the intracavity diameter of the diameter of the thickness of given specific piezoelectric ceramic piece, piezoelectric ceramic piece, end cap electrode, end cap electrode.Above-mentioned parameter also can change in actual applications, as parameter change the time, its computational methods also are application of formula (1), just the coefficient B difference.
Claims (3)
1, a kind of broad band super sound piezoelectric compound transducer comprises piezoelectric ceramic piece (1) and is bonded in upper end cap electrode (2), lower end cap electrode (3) on the piezoelectric ceramic piece (1), it is characterized in that: upper end cap electrode (2) thickness t
B1With lower end cap electrode (3) thickness t
B2Inequality, t wherein
B1And t
B2Span be 0.15mm～0.59mm, wherein, end cap electrode material thickness t
B1And t
B2Difference DELTA
TbAccording to formula f
B2=B Δ t
b+ f
B1Calculate, in the formula, f
B1Be upper end cap electrode (2), first resonant frequency of operation of lower end cap electrode (3) when material thickness is identical, f
B2Be second resonant frequency of operation, B is an experimental constant, and it obtains like this: upper/lower electrode thickness is a
1The time, record a resonant frequency f
1, upper/lower electrode thickness is a
2The time, record a resonant frequency f
2, then B is | f
1-f
2| with | a
1-a
2| between ratio, thereby bandwidth of operation Δ f
B=f
B2-f
B1After determining, just obtain another one end cap thickness of electrode according to a known end cap thickness of electrode.
2, broad band super sound piezoelectric compound transducer as claimed in claim 1, wherein upper end cap electrode (2) thickness t
B1Less than lower end cap electrode (3) thickness t
B2
3, broad band super sound piezoelectric compound transducer as claimed in claim 1, wherein upper end cap electrode (2) thickness t
B1Greater than lower end cap electrode (3) thickness t
B2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004101017311A CN1331617C (en) | 2004-12-24 | 2004-12-24 | Novel broad band super sound piezoelectric compound transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004101017311A CN1331617C (en) | 2004-12-24 | 2004-12-24 | Novel broad band super sound piezoelectric compound transducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1621163A CN1621163A (en) | 2005-06-01 |
| CN1331617C true CN1331617C (en) | 2007-08-15 |
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ID=34766792
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004101017311A Expired - Fee Related CN1331617C (en) | 2004-12-24 | 2004-12-24 | Novel broad band super sound piezoelectric compound transducer |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100411215C (en) * | 2005-09-23 | 2008-08-13 | 中国人民解放军国防科学技术大学 | Combined type ultrasonic transducer |
| CN100561575C (en) * | 2006-06-23 | 2009-11-18 | 北京大学 | Dish type transmitting transducer |
| DE102016101660A1 (en) * | 2016-01-29 | 2017-08-03 | Weber Ultrasonics Gmbh | Method for exciting piezoelectric transducers and sound generating arrangement |
| CN108296154B (en) * | 2017-08-07 | 2023-12-05 | 雷索智能科技(苏州)有限公司 | Ultrasonic vibration mechanism and ultrasonic vibration device |
| CN110809213B (en) * | 2018-08-06 | 2023-07-18 | 中国科学院声学研究所 | Composite broadband transducer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3508719A1 (en) * | 1985-03-12 | 1986-09-18 | Peter 4182 Uedem Küppers | Sound pick-up for a cymbal |
| CN2082849U (en) * | 1990-09-25 | 1991-08-14 | 东北内蒙古煤炭工业联合公司沈阳煤矿设计院 | Piezoelectric ceramic ultrasonic transducer |
| CN1184440A (en) * | 1995-07-24 | 1998-06-10 | 西门子公司 | Ultrasound transducer |
| US6798122B1 (en) * | 2002-11-05 | 2004-09-28 | The United States Of America As Represented By The Secretary Of The Navy | Lightweight underwater acoustic projector |
-
2004
- 2004-12-24 CN CNB2004101017311A patent/CN1331617C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3508719A1 (en) * | 1985-03-12 | 1986-09-18 | Peter 4182 Uedem Küppers | Sound pick-up for a cymbal |
| CN2082849U (en) * | 1990-09-25 | 1991-08-14 | 东北内蒙古煤炭工业联合公司沈阳煤矿设计院 | Piezoelectric ceramic ultrasonic transducer |
| CN1184440A (en) * | 1995-07-24 | 1998-06-10 | 西门子公司 | Ultrasound transducer |
| US6798122B1 (en) * | 2002-11-05 | 2004-09-28 | The United States Of America As Represented By The Secretary Of The Navy | Lightweight underwater acoustic projector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1621163A (en) | 2005-06-01 |
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