CN100561575C - Dish type transmitting transducer - Google Patents
Dish type transmitting transducer Download PDFInfo
- Publication number
- CN100561575C CN100561575C CNB2006100901183A CN200610090118A CN100561575C CN 100561575 C CN100561575 C CN 100561575C CN B2006100901183 A CNB2006100901183 A CN B2006100901183A CN 200610090118 A CN200610090118 A CN 200610090118A CN 100561575 C CN100561575 C CN 100561575C
- Authority
- CN
- China
- Prior art keywords
- transducer
- shell
- actuating arm
- transmitting transducer
- circular connector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Transducers For Ultrasonic Waves (AREA)
Abstract
The invention provides a kind of dish type transmitting transducer, belong to the underwater acoustic transducer technical field.This transducer comprises one by the actuating arm of central supported piece, a plurality of longitudinal vibration patterns and star pattern driver and two dish-shaped shells that cyclic adapting piece is formed.The cyclic adapting piece of star pattern driver is closely fixedlyed connected with two shells.Utilize the radial vibration of actuating arm longitudinal vibration mode producing cyclic adapting piece, drive dish-shaped shell, the flexural vibration mode of excitation shell, and be radiating surface radiative acoustic wave in medium with the shell.Transducer of the present invention can be applied to fields such as low frequency active sonar (LFAS), remote water sound communication, seabed sound tomography and ocean resources exploratory development.
Description
Technical field
The invention belongs to the underwater acoustic transducer technical field, be specifically related to a kind of dish type transmitting transducer.This transducer can be applied to fields such as low frequency active sonar (LFAS), remote water sound communication, seabed sound tomography and ocean resources exploratory development.
Background technology
21 century is the century of ocean.Sound wave is the unique information carrier that can propagate in the ocean medium and long distance.In military field, acoustic method is the main means of Underwater Target Detection, location, identification, navigation, communication; At civil area, acoustic method has critical role especially for offshore oil, natural gas source exploration and seabed formation imaging.
Development along with the target stealth technology, traditional passive sonar status of losing ground, Low-Frequency Active Sonar (LFAS) becomes the main means of stealthy target detection and identification day by day, and the low-frequency high-power transmitting transducer then is one of gordian technique of Low-Frequency Active Sonar.Transmitting transducer is responsible for converting electromagnetic oscillation to mechanical vibrational energy in active sonar equipment, vibrates radiation acoustic energy in water thereby promote aqueous medium.In order to improve remote probe ability to stealthy submarine, must reduce the frequency of operation of transducer significantly, improve transmitting sound power.
In the various application in underwater sound field, single transmitting transducer usually can not satisfy many-sided requirements such as directive property, transmitting sound power and information processing, often must form various basic matrixs by transducer array unit and finish various tasks.These basic matrixs to be fixed on the ship or the mode of towing is worked, therefore are subjected to the serious restriction of mounting platform usually, in order to structure the formation and easy for installation, must reduce the volume and weight of low-frequency high-power transmitting transducer array element significantly.
Therefore, low frequency, high-power, small size, high efficiency transmitting transducer are that the various underwater sounds are used and proposed inevitable requirements, are the matter of science and technologys that needs to be resolved hurrily.
The main difficulty of low-frequency high-power transducer designs is: one, in order to improve emission efficiency and emissive power, transducer must operate at resonance state, and classical longitudinal vibration mode transducers size is directly proportional with wavelength usually, so low more frequency of operation, also just mean huge more transducer dimensions, mean huge weight and cost simultaneously, and the difficulty of making and laying; Two, the radiation power of low-frequency transducer and frequency and swept area square are directly proportional, mean that frequency reduces or area reduces 10 times, radiation power will reduce 100 times, therefore, if when reducing size, the radiation power of transducer needs bigger volumetric velocity when maintenance or increase low frequency, promptly bigger driving power compensates, and this can not realize often.
Therefore, reducing frequency of operation is a pair of contradiction with reducing size, and Enhanced Radiation Reduced Blast power also is a pair of contradiction with reducing size.And reducing frequency and Enhanced Radiation Reduced Blast power is a pair of contradiction equally.
The main method that overcomes the above problems at present has: the one, and adopt beam mode to replace traditional harmomegathus vibration mode on the structure, reduce resonant frequency, corresponding representative is I type, II type, III type, IV type, V-type flextensional transducer, wherein commonly used with IV type, V-type flextensional transducer, the ring-type transducer also once once used, but efficient is lower; The 2nd, use material and replace traditional piezoceramic material with bigger compliance and coefficient of dilatation, to raise the efficiency and vibration displacement, typical representative is giant magnetostrictive material, relaxor ferroelectric monocrystal material and piezo-electricity composite material.
With reference to figure 1, the housing 12 of IV type flextensional transducer is a protruding ovum circle, flat ovum circle or elliptical tube, also can do concavity (spill also claims curved of VII type).Piezoelectric ceramic wafer heap 11,, drives elliptical tube and does flexural vibrations when it does stretching vibration when excitation in enclosure interior along the major axis close installation of elliptical tube.The displacement of short-axis direction is exaggerated, and is generally two to four times of long axis direction.Elliptical tube is sealed formation cavity at two ends.This class transducer the time makes the elliptical tube distortion in advance by screw rod or assembling, applies prestress (pressure) to stack of wafers, to satisfy the needs of bias stress when the depth capacity full power operation.The shortcoming of IV type flextensional transducer is that nodel line is arranged on the radiating surface, and partial radiation acoustic energy is cancelled, and single piezoelectric ceramics heap (or rare earth rod) drives, and space availability ratio is not high, and power capacity is limited;
The V-type flextensional transducer is commonly referred to as clam shell transducer (as shown in Figure 2), use a ceramic ring as driver, also claim annulus-shell mould flextensional transducer, the V-type flextensional transducer grips a Piezoelectric Ceramic annulus 21 by the spherical shell 22 of two symmetries to be formed, and spherical shell also can be made (spill also claim the VI type is curved open) of concave shape.Very large-sized driving ring can be pieced together edge by the piezoelectric ceramics bar of making rectangle and metal wedge bar and form.When driving ring is done radial vibration, promote spherical shell and do flexural vibrations.The shortcoming of V-type flextensional transducer is that large-sized driving ring is difficult for processing, and the space availability ratio of annular drive device is not high, and power capacity is limited, and the V-type flextensional transducer utilizes the d of piezoelectric
31Parameter is not as utilizing d
33The transmitting voltage response height of parameter;
Selenodont (Moonie) flextensional transducer (see figure 3) and cymbals formula (Cymbal) transducer (see figure 4) are two kinds of small-sized V-type transducers.The selenodont flextensional transducer has selenodont shell 32, utilizes the radial vibration of monolithic piezoelectric driving element 31 to encourage curved Zhang Zhen's dynamic model formula of housing.Compare with the V-type flextensional transducer, its volume and weight is all very little, and piezo-electric drive units is piezoelectric ceramic piece rather than piezoelectric ceramic ring, and the position of bonding is slightly different.The Cymbal transducer is the modified of Moonie, betal can 42 with cymbals formula shape, the thickness of shell is more much smaller than the thickness of Moonie flextensional transducer, such design has reduced to concentrate on the stress of the bonded edge of transducer, has improved the efficient that the radial vibration of piezoelectric ceramic piece 41 is coupled as the axial vibration displacement of betal can greatly.Moonie and Cymbal transducer drive by monolithic piezoelectric ceramic or monocrystal material, and power capacity is less, generally as nautical receiving set.Also have a plurality of cymbal transducers are combined, improve radiation power, perhaps combine and make driver, drive a sheet metal and use, but power capacity is still very low as emission.
Ring-type transducer (Ring transducer) (as shown in Figure 5) is inserted in the annulus as driver according to " star " shape by some length oscillators, with the annulus of outside as radiating surface.Each length oscillator is made up of multi-disc piezoelectric ceramics 51 and tail quality 52.There are two main resonance frequencies to use, the one, the low slightly resonance frequency of the resonance frequency of annulus self (the breathing mode of annulus), the 2nd, the high slightly resonance frequency of the resonance frequency of each length oscillator (the compressional vibration mode of similar Tonpilz transducer).The shortcoming of ring-type transducer is that frequency of operation can't accomplish very low, and the anchor ring radiation efficiency is also very low, and radiating surface is vertical with the driver plane, does not utilize the space well, and volume is bigger.
Summary of the invention
The shortcoming that the low frequency size that the present invention has overcome longitudinal vibration mode transducers (comprising the ring-type transducer) is big, efficient is low and the power capacity of V-type flextensional transducer is big inadequately, space availability ratio is not high, the manufacture craft difficulty is bigger, a kind of dish type transmitting transducer is proposed, this dish type transmitting transducer has compact conformation, size is little, frequency is low, power capacity super large, emission efficiency and the high characteristics of transmitting voltage response, and manufacture craft is simpler.
Above-mentioned purpose of the present invention is achieved by the following technical solutions:
A kind of dish type transmitting transducer, comprise: a star pattern driver and two dish-shaped shells, the star pattern driver is made up of central supported piece, circular connector and the actuating arm that is no less than three longitudinal vibration patterns, each actuating arm is provided with contact conductor, one end of actuating arm is connected with the central supported piece, the other end of actuating arm is connected with circular connector, and two shell right-hand threads or left-hand thread are separately fixed on the circular connector of star pattern driver, forms the roudnel profile of concave or convexity.Extensional vibration promotion circular connector by actuating arm is done radial vibration, thereby encourages curved Zhang Zhen's dynamic model attitude of two shells, to the medium radiative acoustic wave.
Two shells can be flat-top conical shell shape or spherical, and the shell available epoxy waters and is connected on the circular connector, and are interfixed by a plurality of bolts that run through two shell outer rims.
Actuating arm can be laminated by multi-disc ring piezoelectric sheet and make, and is provided with electrode slice extraction electrode lead-in wire; Actuating arm also can be made by giant magnetostrictive rod, and giant magnetostrictive rod is on every side by lead coiled coil.
Circular connector can be by being spliced with the same number of transition block of actuating arm, and transition block and actuating arm are used to apply prestress by being bolted on the central supported piece of running through.The central supported piece can be equilateral polygon, circle or annular.
The horizontal cross-section of transition block can be tubaeform.
Shell is fixed on the circular connector of star pattern driver, make the space that forms a sealing in the star pattern driver, in this space, can fill oil-based liquid, compliance or damping material, on two shells, can be provided with aperture or kapillary, be used to provide pressure equilibrium, or spread bandwidth.
In the outside of circular connector, between two shells, can be provided with O-ring seal.
Technique effect of the present invention:
Key of the present invention is the radial vibration that circular connector is provided by the extensional vibration that the star pattern driver produces, and utilizes fixedlying connected between circular connector and the shell, and the flexural vibrations of excitation shell are by shell radiative acoustic wave in medium.The technique effect that the present invention brings mainly contains:
(1) utilization of the present invention is the flexural vibration mode of two shells, by shell to the medium radiative acoustic wave, thereby on the smaller szie shell, realize low frequency radiation, compare with composite bar energy converter or with the ring-type transducer, have lower frequency, bigger swept area and high radiation efficiency more with the transducer of volume, thereby have higher transmitting response; And radiating surface and driver plane parallel, improved space availability ratio;
(2) transducer of the present invention adopts shell mechanism radiating surface when the single order modal vibration not have nodel line, and radiating surface and driver displacement amplification ratio are very big, with respect to IV type flextensional transducer, have higher radiation efficiency;
(3) driver of the present invention utilizes the d of piezoelectric
33Coefficient is worked, and utilizes the d of piezoelectric compared with V-type flextensional transducer (or selenodont or cymbal transducer)
31Coefficient has higher transmitting response;
(4) the actuating arm number of the star pattern driver of the present invention's employing can be with adjusted size, and can increase the quantity of piezoelectric patches as far as possible, increase the cumulative volume that drives material, adopt single driving rod or V-type flextensional transducer to adopt the driving annulus to compare with IV type flextensional transducer, bigger power capacity can be provided, more make full use of the space, have more compact structure and littler volume, and have higher efficient and transmitting voltage response;
(5) the present invention adopts through bolt that actuating arm is applied prestress, relative IV type or V-type flextensional transducer, more convenient operation; And two shells of the present invention adopt bolt to interfix, and can apply the prestress of transducer thickness direction, thereby adapt to deep water work more, and this is that IV type or V-type flextensional transducer are not available;
(6) shell of the present invention and star pattern driver constitute the acetabulum of an inner complete closed, and it is promptly waterproof only to need to pour into fluid sealant along circumference, relative IV type flextensional transducer, and waterproof and sealing are very simple, and performance is better;
(7) the present invention pours into oil-based liquid in the transducer inner cavity part, and can realize pressure equilibrium by the micropore on the shell, thereby adapts to the work of super large deep water;
(8) the present invention can effectively expand the bandwidth of operation of transducer at inner compliance or the damping material of filling of transducer;
(9) transducer of the present invention at same frequency, with under the power requirement, has more cramped construction with respect to IV type or V-type flextensional transducer, smaller szie, and more light weight is particularly suitable for the needs of structuring the formation;
(10) the present invention adopts symmetrical structure, and parts can standardization, thereby preparation technology is simple.
Description of drawings
Below in conjunction with accompanying drawing, the present invention is made detailed description.
Fig. 1 is an IV type flextensional transducer structural representation;
Fig. 2 is a V-type flextensional transducer structural representation;
Fig. 3 is selenodont (Moonie) flextensional transducer structural representation;
Fig. 4 is cymbals formula (Cymbal) flextensional transducer structural representation;
Fig. 5 is the Annular Transducer structural representation;
Fig. 6 a is the centre section synoptic diagram of convexity roudnel profile transducer of the present invention;
Fig. 6 b is the centre section synoptic diagram of concave roudnel profile transducer of the present invention;
Fig. 7 is a kind of 8 arm star pattern driver synoptic diagram of transducer of the present invention;
Fig. 8 is a transducer monnolithic case schematic top plan view of the present invention.
Embodiment
With reference to figure 6, Fig. 7, Fig. 8, the present invention realizes the high-power transmitting transducer of a low frequency with roudnel profile, small size, high emission voltage responsive.This transducer comprises: form star pattern driver and two flat-top conical shell shapes or spherical shell 4 by the actuating arm 2 of central supported piece 1, N (N 〉=3) longitudinal vibration pattern and cyclic adapting piece 3, circular connector 3 is closely fixedlyed connected with two shells, 4 usefulness glue or with bolt, utilize the cyclic adapting piece radial vibration of star pattern driver, drive shell, the flexural vibration mode of excitation shell; With the shell is radiating surface radiative acoustic wave in medium.
The specific embodiment that realizes transmitting transducer of the present invention is:
(1) is made into central supported piece 1 with certain thickness N (N 〉=3) limit polygon metal or the very big nonmetallic materials of hardness;
(2) build up ceramic stack by the multi-disc piezoelectric ceramic ring and form N actuating arm 2, insert electrode slice in the middle of the ceramic stack, extraction electrode lead-in wire from the electrode slice;
(3) make N trumpet type transition block with metal or other high strength elastic material, the splicing transition block forms circular connector 3;
(4) by running through the high-strength bolt 5 of transition block, piezoelectric ceramics heap, link to each other with back-up block, and apply prestress,, can add certain thickness sheet metal, protection is provided at the ceramic stack two ends;
(5) combine by central supported piece, a N actuating arm and N trumpet type transition block, constitute the star pattern driver;
(6) electrode cable line 9 is drawn by annular drive device side;
(7) flat-top conical shell shape or the spherical shell 4 that two metals or high strength composite are made waters with epoxy resin and to be bonded on the circular connector 3, and the outer rim of shell is closely fixing with bolt 6; Two shells can right-hand thread on circular connector 3, (shown in Fig. 6 a), two shells can left-hand thread on circular connector 3, (shown in Fig. 6 b).
(8) the lateral irrigation fluid sealant forms O-ring seal 7 outside circular connector, and whole energy transducer is encapsulated.
(9) in order to adapt to the work of super large deep water, realize pressure equilibrium, perhaps spread bandwidth can be filled filling materials 8 such as oil-based liquid, compliance or damping material, and hole or kapillary are set on the shell in cavity between the shell at transducer of the present invention.
In sum, the invention discloses a kind of dish type transmitting transducer and its implementation.Above-described application scenarios and embodiment are not to be used to limit the present invention, and any those skilled in the art without departing from the spirit and scope of the present invention, can do various changes and retouching, so protection scope of the present invention is looked the claim scope and defined.
Claims (10)
1, a kind of dish type transmitting transducer, comprise: a star pattern driver and two dish-shaped shells, the star pattern driver is made up of central supported piece, circular connector and the actuating arm that is no less than three longitudinal vibration patterns, each actuating arm is provided with contact conductor, one end of actuating arm is connected with the central supported piece, the other end of actuating arm is connected with circular connector, two shells right-hand thread or left-hand thread respectively are fixed on the circular connector of star pattern driver, form the roudnel profile of concave or convexity.
2, dish type transmitting transducer as claimed in claim 1 is characterized in that: actuating arm is laminated by multi-disc ring piezoelectric sheet and makes, and is provided with electrode slice, extraction electrode lead-in wire from the electrode slice.
3, dish type transmitting transducer as claimed in claim 1, it is characterized in that: actuating arm is made by giant magnetostrictive rod, is wound in coil by lead around the giant magnetostrictive rod, the extraction electrode lead-in wire.
4, dish-shaped transmitting transducer as claimed in claim 1 is characterized in that: two shells are flat-top conical shell shape or spherical, and shell is bonded on the circular connector respectively with glue, and are interfixed by a plurality of bolts that run through the shell outer rim.
5, dish type transmitting transducer as claimed in claim 1 is characterized in that: circular connector is by being spliced with the same number of transition block of actuating arm, and transition block and actuating arm are by being bolted on the central supported piece of running through.
6, dish type transmitting transducer as claimed in claim 5 is characterized in that: the horizontal cross-section of transition block is tubaeform.
7, dish type transmitting transducer as claimed in claim 1, it is characterized in that: shell is fixed on the circular connector of star pattern driver, make the space that forms a sealing between star pattern driver and the shell, in this space, fill oil-based liquid, compliance or damping material.
8, dish type transmitting transducer as claimed in claim 1, it is characterized in that: shell is fixed by bolts on the circular connector.
9, as claim 4,5 or 7 described dish type transmitting transducers, it is characterized in that:, between two shells, be provided with O-ring seal in the outside of circular connector.
10, as claim 1 or 7 described dish-like shape transmitting transducers, it is characterized in that: on two shells, be provided with the hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100901183A CN100561575C (en) | 2006-06-23 | 2006-06-23 | Dish type transmitting transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100901183A CN100561575C (en) | 2006-06-23 | 2006-06-23 | Dish type transmitting transducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101093667A CN101093667A (en) | 2007-12-26 |
| CN100561575C true CN100561575C (en) | 2009-11-18 |
Family
ID=38991879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100901183A Expired - Fee Related CN100561575C (en) | 2006-06-23 | 2006-06-23 | Dish type transmitting transducer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100561575C (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101964185B (en) * | 2010-09-03 | 2013-02-27 | 哈尔滨工程大学 | Ultra-wideband underwater acoustic transducer |
| CN103886856A (en) * | 2014-03-28 | 2014-06-25 | 海鹰企业集团有限责任公司 | Inward-concave Cymbal transducer |
| CN104267643B (en) * | 2014-09-27 | 2016-08-31 | 江苏华宏实业集团有限公司 | Underwater robot target positioning identification system |
| CN105702243B (en) * | 2014-11-28 | 2019-12-17 | 中国科学院声学研究所 | Double-shell series IV-type flextensional transducer |
| CN104935089A (en) * | 2015-06-19 | 2015-09-23 | 王嫣俐 | Wirelessly-powered energy recording and feedback system |
| CN107068141B (en) * | 2017-05-23 | 2020-04-14 | 西北核技术研究所 | Adjustable sheet combined flextensional transducer |
| CN108877756A (en) * | 2018-04-11 | 2018-11-23 | 哈尔滨工程大学 | A kind of low frequency annulus energy converter of flextensional structure driving |
| CN108777831B (en) * | 2018-06-05 | 2020-10-02 | 哈尔滨工程大学 | Conformal driving quadrilateral flextensional transducer |
| CN112556892B (en) * | 2020-11-13 | 2022-10-18 | 北京遥测技术研究所 | High-precision resonant ball type pressure sensor |
| CN114594600B (en) * | 2020-12-03 | 2023-08-15 | 中移(成都)信息通信科技有限公司 | Near-eye display system, fixing device, signal processing method, device and medium thereof |
| CN112769349A (en) * | 2020-12-25 | 2021-05-07 | 西安交通大学 | Cymbal type piezoelectric single crystal driver |
| CN114939522B (en) * | 2022-04-18 | 2024-05-07 | 上海船舶电子设备研究所(中国船舶重工集团公司第七二六研究所) | Prestress application system, method and medium for disk-shaped transducer |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5729077A (en) * | 1995-12-15 | 1998-03-17 | The Penn State Research Foundation | Metal-electroactive ceramic composite transducer |
| CN1177166A (en) * | 1996-07-29 | 1998-03-25 | 株式会社村田制作所 | Piezoelectric electro-acoustic transducer |
| US6629922B1 (en) * | 1999-10-29 | 2003-10-07 | Soundport Corporation | Flextensional output actuators for surgically implantable hearing aids |
| US6664712B2 (en) * | 1999-05-07 | 2003-12-16 | Cranfield University | Ultrasonic motors |
| CN2643591Y (en) * | 2003-07-04 | 2004-09-22 | 张洪平 | Underwater loudspeaker |
| CN1621163A (en) * | 2004-12-24 | 2005-06-01 | 北京信息工程学院 | Novel broad band super sound piezoelectric compound transducer |
| US6984923B1 (en) * | 2003-12-24 | 2006-01-10 | The United States Of America As Represented By The Secretary Of The Navy | Broadband and wide field of view composite transducer array |
-
2006
- 2006-06-23 CN CNB2006100901183A patent/CN100561575C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5729077A (en) * | 1995-12-15 | 1998-03-17 | The Penn State Research Foundation | Metal-electroactive ceramic composite transducer |
| CN1177166A (en) * | 1996-07-29 | 1998-03-25 | 株式会社村田制作所 | Piezoelectric electro-acoustic transducer |
| US6664712B2 (en) * | 1999-05-07 | 2003-12-16 | Cranfield University | Ultrasonic motors |
| US6629922B1 (en) * | 1999-10-29 | 2003-10-07 | Soundport Corporation | Flextensional output actuators for surgically implantable hearing aids |
| CN2643591Y (en) * | 2003-07-04 | 2004-09-22 | 张洪平 | Underwater loudspeaker |
| US6984923B1 (en) * | 2003-12-24 | 2006-01-10 | The United States Of America As Represented By The Secretary Of The Navy | Broadband and wide field of view composite transducer array |
| CN1621163A (en) * | 2004-12-24 | 2005-06-01 | 北京信息工程学院 | Novel broad band super sound piezoelectric compound transducer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101093667A (en) | 2007-12-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100561575C (en) | Dish type transmitting transducer | |
| CN101964185B (en) | Ultra-wideband underwater acoustic transducer | |
| EP0758455B1 (en) | Flextensional acoustic source for offshore seismic exploration | |
| CN101254499B (en) | Big opening angle stack wafer transmitting transducer | |
| CN102662166B (en) | Multimode broadband circular array transducer | |
| CN102169685A (en) | Small sized deepwater underwater sound energy transducer with low frequency and broad band | |
| CN103646642B (en) | Many sap cavities broad band low frequency underwater acoustic transducer | |
| CN103841499A (en) | Prestressed stacked piezoelectric round tube transducer | |
| JP5387293B2 (en) | Acoustic transducer | |
| CN102843637B (en) | Cylindrical transducer with stacked piezoelectric circular tubes with different internal diameters | |
| CN102136268A (en) | Bent piezoelectric-ceramic low-frequency underwater acoustic transducer | |
| JP2011015270A (en) | Acoustic transducer | |
| CN108435523B (en) | Water drop type flextensional transducer | |
| CN106448644B (en) | nondirectional broadband high-power Janus underwater acoustic transducer | |
| CN202042174U (en) | Zigzag piezoelectric-ceramic low-frequency underwater acoustic transducer | |
| CN102750941A (en) | Deep-water ultra wide band spherical transducer | |
| CN105187983B (en) | A kind of bending cylindrical transducer and its implementation | |
| CN111541979B (en) | Magnetostrictive flextensional electroacoustic transducer | |
| CN102748013B (en) | Low-frequency dipole transmitting transducer | |
| CN212441930U (en) | Displacement amplification type magnetostrictive transducer | |
| CN107274877B (en) | Phase inversion type deep sea bending and stretching underwater acoustic transducer | |
| CN110010113B (en) | Radial radiation jetty-helmholtz underwater acoustic transducer | |
| CN101634587B (en) | Three-dimensional co-vibrating sandwich-type sonar receiver | |
| CN215871815U (en) | Double-liquid-cavity broadband transducer for deep water | |
| CN111659598B (en) | Displacement amplification type magnetostrictive transducer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091118 Termination date: 20150623 |
|
| EXPY | Termination of patent right or utility model |