CN101629868A - Shear flow sensor - Google Patents
Shear flow sensor Download PDFInfo
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- CN101629868A CN101629868A CN200910070138A CN200910070138A CN101629868A CN 101629868 A CN101629868 A CN 101629868A CN 200910070138 A CN200910070138 A CN 200910070138A CN 200910070138 A CN200910070138 A CN 200910070138A CN 101629868 A CN101629868 A CN 101629868A
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Abstract
The invention discloses a shear flow sensor comprising a piezoelectric film matrix with one end being provided with an aerofoil probe. A piezoelectric film is hermetically sticked to the surface of the piezoelectric film matrix, and two end planes of the piezoelectric film are respectively connected with a lead; the thickness of the piezoelectric film is 0.1-0.5mm, and the piezoelectric film is prepared from one of PVDF and PZT or PT; a connecting rod is in hermetical sleeve joint with the other end of the piezoelectric film matrix, and the piezoelectric film matrix is bonded with the inner wall of the connecting rod by adhesives; a cavity for leading out the lead is arranged in the connecting rod; a protective sleeve is arranged outside the piezoelectric film matrix and is fixed with the connecting rod by a lock nut. The invention can measure the ocean turbulence intensity by using a piezoelectric film material so as to research the ocean turbulence effects, and simultaneously, the performances of each aspect of the shear flow sensor is superior to the performances of a common piezoelectric ceramic sensor.
Description
Technical field
The present invention relates to a kind of sensor, specifically, relate to a kind of sensor that utilizes piezoelectric Measuring Oceanic turbulent flow to change.
Background technology
Turbulent flow research is the key areas of scientific research of seas, turbulent flow has significant contribution to momentum, heat and the mass transport of seawater, to the appreciable impact that is distributed with of solubilised state, granulating material in seawater movement speed, holding property of thermohaline and the water, microstructure is that the turbulent motion of small scale is the motive power that produces the ocean macroscopic appearance.
People simulate by setting up corresponding mathematical model the research of turbulence effect.In these models, the kinetic energy dissipation rate of turbulent flow is an important parameter, and its is the influence institute model of setting up levels of precision that the ocean macroscopic motion is simulated directly.It is research seawater turbulent motion rule and the important source book that obtains the kinetic energy dissipation rate that seawater is sheared flow speed data, that is to say, the microstructure stream that obtains main dependence ocean section of kinetic energy dissipation rate is sheared data, and obtain at present data effectively and reliable means be to use shear flow sensor.
Domestic research to shear flow sensor at present is comparatively backward, is in space state substantially; And also have only a few countries such as Germany, Canada, the U.S., Japan to grasp shear flow sensor and measurement of correlation technology abroad, be to utilize piezoceramic transducer to measure basically.Piezoelectric ceramics is mechanical energy and the electric energy ceramic material of conversion mutually can be belonged to a kind of of piezoelectric, piezoelectric polarization can take place under the effect of being under pressure and between two end surfaces appearance potential poor, the quantity of electric charge is directly proportional with pressure.Piezoceramic transducer promptly is to utilize the piezoelectric property of piezoelectric ceramics directly to do the detection use.Although piezoceramic transducer has plurality of advantages, in use also expose some owing to the defective that material itself is caused, for example the deflection of piezoelectric ceramics is less, therefore fractures easily etc.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of piezoelectric effect Measuring Oceanic turbulence intensity that can utilize the piezoelectric film material, thus the shear flow sensor of research oceanic turbulence effect, and the performance of its each side all is better than common piezoceramic transducer simultaneously.
In order to solve the problems of the technologies described above, the present invention is achieved by following technical scheme:
A kind of shear flow sensor comprises that an end is provided with the piezoelectric film matrix of probe, and described piezoelectric film matrix surface sealing is pasted with piezoelectric film, and the both ends of the surface of described piezoelectric film are connected with lead respectively.
Described piezoelectric film is by PVDF, PZT or PT a kind of making wherein.
The thickness of described piezoelectric film is 0.1～0.5mm.
Described piezoelectric film sticks on the single face of piezoelectric film matrix or two-sided.
Described probe is the aerofoil profile probe.
Described piezoelectric film matrix is made by wherein any one of aluminium alloy, polyamide, polypropylene or PVM.
The other end sealing shroud of described piezoelectric film matrix is connected to connecting link, and described connecting link inside is provided with the cavity that is used to draw lead.
Described piezoelectric film matrix outer setting has protective sleeve, and described protective sleeve is fixed by locknut and connecting link.
Described piezoelectric film matrix is by binder and connecting link inwall bonding.
Described connecting link outer setting has seal groove.
The invention has the beneficial effects as follows:
(1) this shear flow sensor through demarcate and definite sensitivity after can be used for the Measuring Oceanic turbulence effect, significant for research ocean microscopic motion: as to do the time spent when sensor is subjected to oceanic turbulence, its inner piezoelectric generation electric charge that deforms, and amount of charge and oceanic turbulence acting force are linear, and charge signal is gathered and handled in order to effective Measuring Oceanic turbulent flow data.
(2) the piezoelectric film material that preferably uses of the present invention is PVDF, and the PVDF piezoelectric film itself has the characteristics of chemical stability, agent of low hygroscopicity, high thermal stability, high anti-UV radianting capacity, high shock-resistant, fatigue resistance:
1. its chemical stability is higher 10 times than pottery, can use for a long time below 80 ℃;
2. its quality softness, in light weight is close with the acoustic impedance of water, and matching status is good, uses highly sensitive;
3. its humorous frequency in the stretching vibration of thickness direction is very high, can obtain the flat response of broad, and the frequency response width is much better than common piezoelectric ceramics;
Therefore, the shear flow sensor based on PVDF piezoelectric film structure has advantage not fragile, highly sensitive, good stability.
(3) the aerofoil profile probe is adopted in end of the present invention, and this special shape makes probe portion stressed evenly, and hydrodynamic performances is good.
(4) cost of the present invention is comparatively cheap, is suitable for promoting the use of on a large scale.
Description of drawings
Fig. 1 is a general assembly structural representation of the present invention;
Fig. 2 is piezoelectric film basal body structure figure of the present invention.
---1 seal groove---2 lead---3 among the figure: connecting link
Locknut---4 binders---5 piezoelectric film---6
Piezoelectric film matrix---7 protective sleeves---8 probe---9
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples:
The invention discloses a kind of shear flow sensor, utilize the piezoelectric effect Measuring Oceanic turbulent flow power of piezoelectric film material.As shown in Figure 2, the present invention comprises that mainly face seal is pasted with the piezoelectric film matrix 7 of piezoelectric film 6, and an end of described piezoelectric film matrix 7 is provided with probe 9.
Described piezoelectric film matrix 7 is generally schistose texture, and described piezoelectric film 6 sticks on the single face of piezoelectric film matrix 7 or two-sided, and when sticking on when two-sided, test signal will correspondingly be strengthened, and therefore generally single face is pasted and got final product.Closely stickup is seamless between piezoelectric film 6 and the piezoelectric film matrix 7, accomplishes the state that seals.The thickness of described piezoelectric film 6 is usually in the scope of 0.1～0.5mm.
Described piezoelectric film 6 is a kind of macromolecule sensing materials, can have piezoelectric effect with respect to the variation output charge signal of pressure or tensile force.So-called piezoelectric effect is meant that some dielectric is subjected to the effect of external force in a certain direction and when being out of shape, positive and negative opposite electric charge appears in its inner polarization phenomena that can produce simultaneously on its two apparent surfaces.After external force was removed, it can return to uncharged state again, and when the direction of acting force changed, the polarity of electric charge also changed thereupon.Piezoelectric film 6 used in the present invention is by PVDF, PZT or PT a kind of making wherein.Comparatively preferred piezoelectric film 6 materials are PVDF, and it has advantages such as not fragile, highly sensitive, good stability as piezoelectric film 6.
Deformation can also take place with piezoelectric film 6 in effect that described piezoelectric film matrix 7 not only has protection and supports piezoelectric film 6 jointly under the effect of external force.Described piezoelectric film matrix 7 is for having certain flexible element, can be that metal material is made, also can be that nonmetallic materials are made, comparatively Chang Yong material has metal materials such as aluminium alloy or polyamide (PA), polypropylene (PP), PVM (PVM) to wait other plastic materials.
Described probe 9 is used at first accepting external influence power, and described probe 9 is preferably the aerofoil profile probe, and aerofoil profile is the front end slyness, the similar bullet shape of profile.Aerofoil profile probe 9 is stressed even, and hydrodynamic performances is good, and is therefore comparatively stable and accurate to the transmission of external force.
As shown in Figure 1, the both ends of the surface of described piezoelectric film 6 are connected with lead 3 respectively.Described lead 3 is drawn from the upper and lower surface of piezoelectric film 6, in order to being connected on the circuit board, piezoelectric film 6 is transported to circuit board because of the charge signal that pressure or tensile force produce, and collection and the processing by related software obtains the oceanic turbulence data then.
Again as shown in Figure 1, the other end outer cover of described piezoelectric film matrix 7 is connected to connecting link 1, and described connecting link 1 inside is provided with the cavity that is used to draw lead 3.Described connecting link 1 must be tightly connected with piezoelectric film matrix 7, and therefore best fixed form is that described piezoelectric film matrix 7 is by binder 5 and connecting link 1 inwall bonding.
Here comparatively preferred binder 5 is an epoxy resin, epoxy resin is the organic high molecular compound that contains two or more epoxide groups in the general reference molecule, its adhesion is stronger, various materials all had very high adhesion, and shrinkability was low when it solidified, the internal stress that produces is little, also helps to improve adhesion strength.In addition, the epoxy-resin systems after the curing has excellent mechanical property, has good insulating property, chemical stability, dimensional stability are good.Therefore, epoxy resin not only can be adhesively fixed piezoelectric film matrix 7 and connecting link 1, and can be harder after binding, and can also play certain supporting role to piezoelectric film matrix 7, realize that sealing is intact between piezoelectric film matrix 7 and the connecting link 1, simultaneously insulation, corrosion-resistant, stable performance.
Described connecting link 1 outside also is provided with seal groove 2.When shear flow sensor is installed on the sensor lift-launch platform by connecting link 1, be embedded in O-ring seal, enter sensor carrier to prevent seawater at seal groove 2.
Described piezoelectric film matrix 7 outsides also are provided with protective sleeve 8, and described protective sleeve 8 is fixing with connecting link 1 by locknut 4.Described protective sleeve 8 not only has the certain protection effect to piezoelectric film matrix 7, the more important thing is that can limit piezoelectric film matrix 7 big displacement occurs.
Shear flow sensor of the present invention is installed in shear flow sensor on the sensor carrier platform earlier when work, and sensor is followed carrier and done level or vertical motion, the vertical or horizontal direction turbulent motion of Measuring Oceanic respectively.Piezoelectric film matrix 7 passes to piezoelectric film 6 with the power that oceanic turbulence acts on the probe 9, make piezoelectric film 6 distortion and produce charge signal, charge signal is handled by the circuit board in the carrier and is gathered, by related software data are handled computing again, finally obtain relevant ocean, marine site microscopic motion data.
Although in conjunction with the accompanying drawings the preferred embodiments of the present invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment only is schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away under the scope situation that aim of the present invention and claim protect, can also make the concrete conversion of a lot of forms, these all belong within protection scope of the present invention.
Claims (10)
1. a shear flow sensor is characterized in that, comprises that an end is provided with the piezoelectric film matrix of probe, and described piezoelectric film matrix surface sealing is pasted with piezoelectric film, and the both ends of the surface of described piezoelectric film are connected with lead respectively.
2. a kind of shear flow sensor according to claim 1 is characterized in that, described piezoelectric film is by PVDF, PZT or PT a kind of making wherein.
3. a kind of shear flow sensor according to claim 1 is characterized in that, the thickness of described piezoelectric film is 0.1～0.5mm.
4. a kind of shear flow sensor according to claim 1 is characterized in that, described piezoelectric film sticks on the single face of piezoelectric film matrix or two-sided.
5. a kind of shear flow sensor according to claim 1 is characterized in that, described probe is the aerofoil profile probe.
6. a kind of shear flow sensor according to claim 1 is characterized in that, described piezoelectric film matrix is made by wherein any one of aluminium alloy, polyamide, polypropylene or PVM.
7. a kind of shear flow sensor according to claim 1 is characterized in that, the other end sealing shroud of described piezoelectric film matrix is connected to connecting link, and described connecting link inside is provided with the cavity that is used to draw lead.
8. a kind of shear flow sensor according to claim 7 is characterized in that, described piezoelectric film matrix outer setting has protective sleeve, and described protective sleeve is fixed by locknut and connecting link.
9. a kind of shear flow sensor according to claim 7 is characterized in that, described piezoelectric film matrix is by binder and connecting link inwall bonding.
10. a kind of shear flow sensor according to claim 7 is characterized in that, described connecting link outer setting has seal groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100701388A CN101629868B (en) | 2009-08-14 | 2009-08-14 | Shear flow sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100701388A CN101629868B (en) | 2009-08-14 | 2009-08-14 | Shear flow sensor |
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| Publication Number | Publication Date |
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| CN101629868A true CN101629868A (en) | 2010-01-20 |
| CN101629868B CN101629868B (en) | 2012-05-09 |
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| CN2009100701388A Active CN101629868B (en) | 2009-08-14 | 2009-08-14 | Shear flow sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105806592A (en) * | 2016-05-16 | 2016-07-27 | 中国科学院半导体研究所 | Optical-fiber turbulent flow sensor and turbulent flow measurement system |
| CN106556490A (en) * | 2016-11-29 | 2017-04-05 | 西安交通大学 | A kind of triangular beam structural turbulence sensor |
| CN110068310A (en) * | 2019-04-28 | 2019-07-30 | 中北大学 | High reliability oceanic turbulence sensing device |
-
2009
- 2009-08-14 CN CN2009100701388A patent/CN101629868B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105806592A (en) * | 2016-05-16 | 2016-07-27 | 中国科学院半导体研究所 | Optical-fiber turbulent flow sensor and turbulent flow measurement system |
| CN106556490A (en) * | 2016-11-29 | 2017-04-05 | 西安交通大学 | A kind of triangular beam structural turbulence sensor |
| CN106556490B (en) * | 2016-11-29 | 2020-05-19 | 西安交通大学 | Triangular beam structure turbulence sensor |
| CN110068310A (en) * | 2019-04-28 | 2019-07-30 | 中北大学 | High reliability oceanic turbulence sensing device |
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| Publication number | Publication date |
|---|---|
| CN101629868B (en) | 2012-05-09 |
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Effective date of registration: 20231218 Address after: 300392 East 1st and 2nd floors of Building 2, No. 2 Haitai Huake Fourth Road, Huayuan Industrial Zone (Outer Ring), Binhai New Area, Tianjin City Patentee after: Tianjin Huiyang Intelligent Equipment Co.,Ltd. Address before: 300072 Tianjin City, Nankai District Wei Jin Road No. 92 Patentee before: Tianjin University |
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