CN101561313B - Trivector hydrophone based on piezoelectric velocity sensor - Google Patents
Trivector hydrophone based on piezoelectric velocity sensor Download PDFInfo
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- CN101561313B CN101561313B CN2009100720092A CN200910072009A CN101561313B CN 101561313 B CN101561313 B CN 101561313B CN 2009100720092 A CN2009100720092 A CN 2009100720092A CN 200910072009 A CN200910072009 A CN 200910072009A CN 101561313 B CN101561313 B CN 101561313B
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- velocity sensor
- piezoelectric
- piezoelectric velocity
- vector hydrophone
- spheroid
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Abstract
The invention provides a trivector hydrophone based on a piezoelectric velocity sensor, which comprises a spheroid, and hanging elements, a velocity sensor and a multi-core output tape cable all arranged in the spheroid, wherein the velocity sensor comprises three piezoelectric velocity sensors which are connected in sequence through connecting rods; one end of the four hanging elements is fixed on the middle piezoelectric velocity sensor, while the other end extends out of the spheroid; and the spheroid is a solid sphere. The average density of the vector hydrophone approximates to the watermedium density; the channel sensitivity is high in a working frequency band below 2,000 hz and is irrelevant to the frequency; the vector hydrophone has good cosine directivity; and the vector hydrophone is not limited by an obliquity during working. The vector hydrophone can be widely used in various fields of hydroacoustics, such as sonobuoys, low noise motion target measurement, target orientation and the like.
Description
(1) technical field
What the present invention relates to is a kind of vector hydrophone, particularly a kind of synchronous vibration type vector hydrophone that adopts piezoelectric velocity sensor as the pick-up unit.
(2) background technology
Vector hydrophone inside generally all adopts acceleration transducer as the pick-up unit; It can time synchronized, the space concurrent records the vibration acceleration at particle place in the sound field under water, just can obtain the vibration velocity and the displacement at this particle place on this basis through integral operation.And based on the vector hydrophone of acceleration transducer, the sensitivity of its vector passage reduces along with the reduction of frequency of operation.The vector hydrophone of low-frequency range (being lower than 1000Hz) has obtained in underwater sound field using widely at present.
Rolled up in the 5th phase 193-195 page or leaf in 2007 the 26th Harbin Engineering University's master thesis " development of 10-100Hz vector hydrophone and Study on Test Method thereof ", " acoustic technique " in 2007; A kind of vector hydrophone that adopts the moving-coil speed sensor to process is disclosed; Be limited to 100Hz on the frequency band, the free field voltage sensitivity of three passages is lower than-210dB.Vector hydrophone is inner adopt be can only horizontal direction work and vertical direction work six have only polarity moving-coil type vibration velocity sensor; During use if the channel axis of vector hydrophone departs from level or vertical direction when spending greater than 10; Moving coil pickoff just can not be worked; This is the restriction that receives moving-coil speed working sensor principle, the serious like this practical engineering application that restricts vector hydrophone.
(3) summary of the invention
The object of the present invention is to provide a kind of channel axis to not receiving level inclination and vertical dip angle restriction, the trivector hydrophone that remains unchanged in the sensitivity of working band internal channel based on piezoelectric velocity sensor.
The objective of the invention is to realize like this:
It comprises spherical, is arranged on hanging element, speed pickup in the spherical, a multicore output tape cable; Described speed pickup comprises three piezoelectric velocity sensors, and three piezoelectric velocity sensors connect through connecting link successively; One end of four hanging elements is fixed on the middle piezoelectric velocity sensor, the other end stretches out spherical; Described spherical is a solid sphere.
The present invention can also comprise:
1, described four hanging elements evenly distribute, and are rigidly connected with the piezoelectric velocity sensor of centre.
2, described three piezoelectric velocity sensors are vertically placed respectively successively, they axially point to X, Z, three coordinate directions of Y respectively.
3, three piezoelectric velocity sensors after the described connection integrant center of gravity, geometric center overlap with center of gravity, the geometric center of solid sphere.
4, described spherical is that to carry out the formed average density of whole embedding be 1g/cm for potpourri by epoxy resin and glass microballoon
3Solid.
The present invention proposes a kind of novel three-dimensional spherical vector hydrophone based on piezoelectric velocity sensor; Adopted three piezoelectric acceleration transducers respectively as three pick-up unit of vector hydrophone in the design; Can satisfy the designing requirement of vector hydrophone; But, can guarantee vector hydrophone equal ability operate as normal under arbitrary angle owing to adopted non-polar speed pickup; Also owing to adopted the piezoelectric velocity speed pickup, adopt the vector hydrophone of acceleration transducer to compare with inside, the channel sensitivity of low-frequency range has improved tens decibels, and channel sensitivity and frequency-independent.Simultaneously vector hydrophone simple in structure, in water, also have neutral buoyancy, these advantages make it in practical applications, have extraordinary application prospect.Trivector hydrophone based on piezoelectric velocity sensor of the present invention is on the theoretical foundation of co-vibrating spherical vector hydrophone; Adopt piezoelectric type, nonpolarity speed pickup as inner pick-up unit design; With adopt moving-coil type, have the vector hydrophone of polarity speed pickup to compare; No longer receive the restriction at inclination angle during practical engineering application, it is extremely convenient to use, and channel sensitivity has improved greatly.
Theoretical foundation of the present invention remains the co-vibrating spherical vector hydrophone DESIGN THEORY; If just the physical dimension of the firm spheroid of acoustics (is kL＜＜1 much smaller than wave length of sound; K is a wave number; L is the maximum gauge of firm ball), when then it does free movement under the effect of underwater acoustic wave, the vibration velocity amplitude V of spheroid geometric center place water particle in the vibration velocity amplitude V of firm spheroid and the sound field
0Between have a following relation:
In the formula---the average density of firm spheroid; ρ
0---aqueous medium density.
Can know by formula, when the average density ρ of firm spheroid equals the aqueous medium density p
0The time, the vibration velocity amplitude V of spheroid geometric center place water particle in its vibration velocity amplitude V and the sound field
0Identical, like this if firm spheroid the pick-up unit that can pick up this vibration arranged, just can obtain the vibration velocity of spheroid geometric center place water particle in the sound field.
In the practical applications, vector hydrophone is hung on the big support by flexible member, and be placed in the water.When measured signal in the water causes the water particle vibration of vector hydrophone center; Vector hydrophone just moves with water particle; The amplitude and the phase place of their motions are basic identical; The inner pick-up unit of vector hydrophone just can obtain the vibration velocity of water particle like this, and is that electric signal is exported with the vibration velocity conversion of signals.
So advantage of the present invention is: the average density of vector hydrophone and aqueous medium density are approaching; Working band internal channel below 2000 hertz is highly sensitive, and and frequency-independent; Vector hydrophone has good cosine directivity; Do not receive the restriction at inclination angle during work.The present invention can be widely used in each field of the underwater sound, like the measurement of sonar buoy, low noise moving target, target localization etc.
(4) description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is sectional view of the present invention (comprising mould).
(5) embodiment
For example the present invention is done description in more detail below in conjunction with accompanying drawing:
In conjunction with Fig. 1.Composition of the present invention comprises the cable [5], four hanger bar [4], three piezoelectric velocity sensors [1], connecting link [2] and the solid sphere [3] that have a multicore output band.Four hanger bar are evenly distributed on the outside surface of spheroid.Three piezoelectric velocity sensors are vertically placed respectively successively, they axially point to X, Z, three coordinate directions of Y respectively.
Preparation method of the present invention is: at first; Employing vertically is rigidly connected three piezoelectric velocity sensors [1] by connecting link [2]; On the speed pickup [1] in the middle of then four hanger bar [4] evenly being fixed in; Three speed pickups [1] that have four hanger bar [4] that connect are placed spherical mould [6], and the potpourri of forming with epoxy resin and glass microballoon [3] carries out whole embedding, and mould [6] has cable output end [5].Potpourri [3] is sloughed mould [6] after solidifying.Obtain vector hydrophone monolithic case diameter 170mm, average density is 1g/cm
3About, working band is 20-2000Hz, the free field voltage sensitivity level is-190dB (0dB re 1V/ μ Pa).
Claims (1)
1. trivector hydrophone based on piezoelectric velocity sensor, it comprises spherical, is arranged on hanging element, speed pickup in the spherical, a multicore output tape cable; It is characterized in that: described speed pickup comprises three piezoelectric velocity sensors, and three piezoelectric velocity sensors connect through connecting link successively; One end of four hanging elements is fixed on the middle piezoelectric velocity sensor, the other end stretches out spherical; Described spherical is a solid sphere; Described four hanging elements evenly distribute, and are rigidly connected with the piezoelectric velocity sensor of centre; Described three piezoelectric velocity sensors are vertically placed respectively successively, they axially point to X, Z, three coordinate directions of Y respectively; Three piezoelectric velocity sensors after the described connection integrant center of gravity, geometric center overlap with center of gravity, the geometric center of solid sphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100720092A CN101561313B (en) | 2009-05-12 | 2009-05-12 | Trivector hydrophone based on piezoelectric velocity sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100720092A CN101561313B (en) | 2009-05-12 | 2009-05-12 | Trivector hydrophone based on piezoelectric velocity sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101561313A CN101561313A (en) | 2009-10-21 |
| CN101561313B true CN101561313B (en) | 2012-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009100720092A Expired - Fee Related CN101561313B (en) | 2009-05-12 | 2009-05-12 | Trivector hydrophone based on piezoelectric velocity sensor |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102486401A (en) * | 2009-12-14 | 2012-06-06 | 陈�峰 | Mini capacitive vector hydrophone with high resolution |
| CN102103013B (en) * | 2010-12-10 | 2012-04-25 | 中北大学 | Three-dimensional vector hydrophone |
| CN103048037A (en) * | 2012-06-14 | 2013-04-17 | 常熟海量声学设备科技有限公司 | Particle vibration velocity measuring sensor for one-dimensional aqueous medium |
| CN103152665B (en) * | 2013-03-01 | 2015-05-20 | 哈尔滨工程大学 | Three-dimensional dual-sphere-shaped intelligent composite vector hydrophone |
| CN103759809B (en) * | 2014-01-15 | 2017-01-04 | 北京航空航天大学 | A kind of three-dimensional piezoelectric vector hydrophone microstructure |
| CN105987751A (en) * | 2015-02-09 | 2016-10-05 | 常熟海量声学设备科技有限公司 | Sensor for detecting 2D vibration velocity and sound pressure of water medium |
| CN107063438B (en) * | 2017-03-10 | 2023-04-28 | 中北大学 | MEMS three-dimensional same-vibration vector hydrophone based on piezoelectric effect |
| CN106706108B (en) * | 2017-03-10 | 2023-04-28 | 中北大学 | MEMS same-vibration spherical vibrator vector hydrophone based on piezoelectric effect |
| CN107202632A (en) * | 2017-06-09 | 2017-09-26 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Vector sensor unit for underwater surveillance net |
| CN107356233B (en) * | 2017-06-14 | 2020-04-14 | 中国科学院声学研究所 | Vertical array system suitable for acoustic hydrological measurement in high-latitude extremely cold sea area |
| CN109413560A (en) * | 2018-08-30 | 2019-03-01 | 南京粒子声学科技有限公司 | A kind of device for realizing vector sensor calibration using matching layer |
| CN111323613B (en) * | 2020-03-21 | 2021-12-24 | 哈尔滨工程大学 | Vector optical fiber sensing probe based on optical fiber interferometer and underground vector accelerometer |
| CN112683386A (en) * | 2020-12-03 | 2021-04-20 | 中国船舶重工集团公司第七一五研究所 | Integral piezoelectric vibration velocity vector hydrophone |
-
2009
- 2009-05-12 CN CN2009100720092A patent/CN101561313B/en not_active Expired - Fee Related
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| CN101561313A (en) | 2009-10-21 |
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Granted publication date: 20120201 Termination date: 20170512 |