CN102620808A - Local resonance type phononic crystal filtering optical fiber hydrophone - Google Patents
Local resonance type phononic crystal filtering optical fiber hydrophone Download PDFInfo
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- CN102620808A CN102620808A CN2012100782921A CN201210078292A CN102620808A CN 102620808 A CN102620808 A CN 102620808A CN 2012100782921 A CN2012100782921 A CN 2012100782921A CN 201210078292 A CN201210078292 A CN 201210078292A CN 102620808 A CN102620808 A CN 102620808A
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Abstract
The invention relates to the field of optical fiber sensing technology, and in particular relates to a phononic crystal filtering optical fiber hydrophone capable of filtering acoustic signals by a phononic crystal. The phononic crystal filtering optical fiber hydrophone comprises an optical fiber hydrophone measuring device and a local resonance type phononic crystal, wherein the local resonance type phononic crystal consists of elements arranged in a periodical way; the optical fiber hydrophone measuring device is arranged in the local resonance type phononic crystal; each element comprises a spherical core body, a covering layer and a cubic base body, wherein the spherical core body covered by the covering layer is encapsulated in the center of the cubic base body; a main body of an underwater acoustic measurement element of the optical fiber hydrophone is a distributed feedback (DFB) optical fiber laser; the DFB optical fiber laser is fixed on the outer walls of the spherical core bodies of the underwater acoustic measurement element of the optical fiber hydrophone by the covering layers; and the spherical core bodies, the DFB optical fiber laser and the covering layers are encapsulated at the centers of the cubic base bodies. The phononic crystal filtering optical fiber hydrophone is small in volume and has a powerful low-frequency filtering function and a frequency division multiplexing function.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, specifically is a kind of phonon crystal filtering fibre optic hydrophone that acoustical signal is carried out filtering through phonon crystal.
Background technology
Fibre Optical Sensor is compared with corresponding conventional sensors, has remarkable advantages at aspects such as sensitivity, dynamic range, reliabilities.
Fibre optic hydrophone is to utilize biography light characteristic and it of optical fiber and all modulation reactions that surrounding environment interacts and produces, and surveys the instrument of signals such as pressure, sound in the liquid.It is compared with traditional piezoelectric type sensor, and following main advantage is arranged: bandwidth, sound pressure sensitivity be high, do not receive electromagnetic interference (EMI), in light weight, can be designed to arbitrary shape, and have information sensing concurrently and optical information is transmitted in advantages such as the whole body.
Local resonance type phonon crystal is proposed in 2000 by people such as professors Liu Zhengyou first.The shot that they will coat very soft silastic material in epoxy resin-base, has formed a kind of phonon crystal of three-dimensional three constituent elements by the simple cubic lattice structural arrangement.Theoretical and experimental result finds that all the pairing wavelength of the band gap of this phonon crystal has been broken through the restriction of Bragg scattering mechanism much larger than grating constant.And when scatterer was not strict period profile, composite structure had band gap equally, had proposed the local resonance mechanism of elastic wave band gap thus.Local resonance mechanism thinks, in the elastic wave excitation of CF down, each scatterer produces and resonates, and with the capable wave interaction of elastic wave long wave, thereby suppress its propagation.Because the interaction of the capable ripple of long wave in scatterer self resonance characteristics and the matrix is depended in the generation of local LOCALLY RESONANT ELASTIC WAVE, therefore, the intrinsic vibration characteristics of its band gap frequency and single scatterer is closely related.This low frequency vibration damping noise reduction for phonon crystal is used and has been started new situation.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of sensitivity that can improve fibre optic hydrophone, and acoustical signal is carried out the local resonance type phonon crystal filtering fibre optic hydrophone of filtering through phonon crystal.
The objective of the invention is to realize like this:
Local resonance type phonon crystal filtering fibre optic hydrophone; Comprise fibre optic hydrophone measurement mechanism, local resonance type phonon crystal; It is characterized in that: local resonance type phonon crystal is made up of the primitive of periodic arrangement, and fibre optic hydrophone measurement mechanism cloth is placed in the local resonance type phonon crystal.
Primitive comprises ball-type heart body, clad and cube matrix, and the ball-type heart body that is coated by clad is encapsulated in a cube matrix center.
The fibre optic hydrophone measurement mechanism is the fibre optic hydrophone underwater acoustic measurement primitive that is embedded in the local resonance type phonon crystal; The main body of fibre optic hydrophone underwater acoustic measurement primitive is the DFB fiber laser; Clad is fixed on the external wall of the ball-type heart of fibre optic hydrophone underwater acoustic measurement primitive with the DFB fiber laser, and cube matrix is encapsulated in ball-type heart body, DFB fiber laser and clad the center of cube matrix.
The present invention has following beneficial effect:
1, the present invention makes fibre optic hydrophone have the effect of low frequency filtering through the effect of the low frequency vibration damping noise reduction of phonon crystal.
2, the nautical receiving set main part is a local resonance type phonon crystal among the present invention, has reduced the volume of nautical receiving set to a great extent.
3, the present invention can change the frequency of its filtering through changing the structure or the material of local resonance type phonon crystal, makes fibre optic hydrophone provided by the invention have the multiplexing function of powerful frequency division.
Description of drawings
Fig. 1 fibre optic hydrophone underwater acoustic measurement primitive inner structure synoptic diagram;
Fig. 2 fibre optic hydrophone underwater acoustic measurement primitive structural representation;
Fig. 3 local resonance type phonon crystal primitive inner structure synoptic diagram;
Fig. 4 local resonance type phonon crystal primitive structural representation;
A kind of local resonance type of Fig. 5 phonon crystal filtering fibre optic hydrophone structural representation.
Embodiment
For making the object of the invention, technical scheme clearer,, the present invention is carried out detailed explanation below in conjunction with concrete condition and with reference to accompanying drawing.
The fibre optic hydrophone measure portion comprises the DFB fiber laser; Local resonance type phonon crystal partly comprises a plurality of primitives that carry out the simple cubic lattice structural arrangement; Primitive partly comprises ball-type heart body, clad, cube matrix.The main body of this fibre optic hydrophone is that a plurality of primitives carry out the local resonance type phonon crystal that the simple cubic lattice structural arrangement is formed, and realizes the filtering to sound field; DFB fiber laser cloth is put in one of them or the several primitive, is used to measure underwater sound signal.
As shown in Figure 1, Fig. 1 is a fibre optic hydrophone underwater acoustic measurement primitive inner structure synoptic diagram of the present invention.It is one to have cube matrix 3 of centrosymmetric structure that this fibre optic hydrophone is measured primitive main body, and comprises as ball-type heart body 1; Be installed on the DFB fiber laser 4 of said ball-type heart body 1 outer wall; Through clad 2 the DFB fiber laser is fixed in ball-type heart body 1 outer wall; Cube matrix 3 is with said ball-type heart body 1, DFB fiber laser 4 and clad 2 its centers of encapsulation.Ball-type heart body 1 is made up of the uniform shot of quality, and its radius is 5mm.The DFB fiber laser is installed on the outer wall of ball-type heart body 1, and with its tight contact.Clad 2 is made up of very soft silastic material.The material of cube matrix 3 generally is made up of epoxy resin.
As shown in Figure 2, Fig. 2 is a fibre optic hydrophone underwater acoustic measurement primitive structural representation of the present invention.Cube primitive 6 among the figure is above-mentioned fibre optic hydrophone underwater acoustic measurement primitives, is used for underwater acoustic measurement.Tail optical fiber 5 is used for the transmission of signal.
As shown in Figure 3, Fig. 3 is a local resonance type phonon crystal primitive inner structure synoptic diagram of the present invention.The main body of this local resonance type phonon crystal is a cube matrix 9 that is made up of epoxy resin (identical with above-mentioned cube matrix 3); This part also comprises a uniform shot of quality as ball-type heart body 7 (identical with above-mentioned ball-type heart body 1), and ball-type heart body 7 outer walls are coating the clad 8 (identical with above-mentioned clad 2) of silastic material.
As shown in Figure 4, Fig. 4 is a local resonance type phonon crystal primitive structural representation of the present invention.Cube primitive 10 among the figure is primitives of local resonance type phonon crystal.
As shown in Figure 5, Fig. 5 is a local resonance type phonon crystal filtering fibre optic hydrophone structural representation of the present invention.Tail optical fiber 11 among the figure is used for the transmission of signal; Cube 12 is a plurality of primitives to be carried out simple cubic lattice structure arrange among the figure; The local resonance type phonon crystal that forms is used for filtering and low frequency noise reduction to acoustical signal, and primitive 13 is a local resonance type phonon crystal primitive among the figure; Be used for the fibre optic hydrophone underwater acoustic measurement primitive that underwater sound signal measures and be positioned at integrally-built center, and can also lay a plurality of fibre optic hydrophone underwater acoustic measurement primitives on this basis and carry out array measurement.
Above-described specific embodiment has carried out further explain to the object of the invention, technical scheme and beneficial effect.Institute is understood that the above is merely specific embodiment of the present invention, is not limited to the present invention, and is all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. local resonance type phonon crystal filtering fibre optic hydrophone; Comprise fibre optic hydrophone measurement mechanism, local resonance type phonon crystal; It is characterized in that: local resonance type phonon crystal is made up of the primitive of periodic arrangement, and fibre optic hydrophone measurement mechanism cloth is placed in the local resonance type phonon crystal.
2. local resonance type phonon crystal filtering fibre optic hydrophone according to claim 1, it is characterized in that: described primitive comprises ball-type heart body, clad and cube matrix, the ball-type heart body that is coated by clad is encapsulated in a cube matrix center.
3. according to claim 1 and 2 described local resonance type phonon crystal filtering fibre optic hydrophones; It is characterized in that: described fibre optic hydrophone measurement mechanism is the fibre optic hydrophone underwater acoustic measurement primitive that is embedded in the local resonance type phonon crystal; The main body of fibre optic hydrophone underwater acoustic measurement primitive is the DFB fiber laser; Clad is fixed on the external wall of the ball-type heart of fibre optic hydrophone underwater acoustic measurement primitive with the DFB fiber laser, and cube matrix is encapsulated in ball-type heart body, DFB fiber laser and clad the center of cube matrix.
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| CN201210078292.1A CN102620808B (en) | 2012-03-23 | 2012-03-23 | Local resonance type phononic crystal filtering optical fiber hydrophone |
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| CN201210078292.1A CN102620808B (en) | 2012-03-23 | 2012-03-23 | Local resonance type phononic crystal filtering optical fiber hydrophone |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106228969A (en) * | 2016-09-19 | 2016-12-14 | 四川大学 | A kind of three-dimensional locally resonant photonic crystal structure and preparation method |
| CN107061260A (en) * | 2017-06-28 | 2017-08-18 | 哈尔滨工程大学 | A kind of three screw pump based on phonon crystal rotor |
| CN107289055A (en) * | 2017-07-12 | 2017-10-24 | 广东科学技术职业学院 | The magnetorheological vibration isolating suspension of three-dimensional tunable locally resonant type Meta Materials |
| CN109737992A (en) * | 2019-01-09 | 2019-05-10 | 苏州大学 | A kind of sensor structure with periodical bandgap structure |
| CN111270621A (en) * | 2019-12-04 | 2020-06-12 | 华东交通大学 | Novel two-dimensional phononic crystal sound barrier structure |
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| CN101726354A (en) * | 2009-12-16 | 2010-06-09 | 中国科学院半导体研究所 | Optical fiber laser vector hydrophone |
| US20110041616A1 (en) * | 2005-04-29 | 2011-02-24 | The Board Of Trustees Of The Leland Stanford Junior University | Acoustic sensor with at least one photonic crystal slab |
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| US20110041616A1 (en) * | 2005-04-29 | 2011-02-24 | The Board Of Trustees Of The Leland Stanford Junior University | Acoustic sensor with at least one photonic crystal slab |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106228969A (en) * | 2016-09-19 | 2016-12-14 | 四川大学 | A kind of three-dimensional locally resonant photonic crystal structure and preparation method |
| CN107061260A (en) * | 2017-06-28 | 2017-08-18 | 哈尔滨工程大学 | A kind of three screw pump based on phonon crystal rotor |
| CN107289055A (en) * | 2017-07-12 | 2017-10-24 | 广东科学技术职业学院 | The magnetorheological vibration isolating suspension of three-dimensional tunable locally resonant type Meta Materials |
| CN107289055B (en) * | 2017-07-12 | 2019-12-31 | 广东科学技术职业学院 | Three-dimensional tunable local resonance type metamaterial magnetorheological vibration isolation support |
| CN109737992A (en) * | 2019-01-09 | 2019-05-10 | 苏州大学 | A kind of sensor structure with periodical bandgap structure |
| CN109737992B (en) * | 2019-01-09 | 2020-11-06 | 苏州星航综测科技有限公司 | Sensor structure with periodic band gap structure |
| CN111270621A (en) * | 2019-12-04 | 2020-06-12 | 华东交通大学 | Novel two-dimensional phononic crystal sound barrier structure |
| CN111270621B (en) * | 2019-12-04 | 2021-09-28 | 华东交通大学 | Novel two-dimensional phononic crystal sound barrier structure |
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| CN102620808B (en) | 2014-03-26 |
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