CN104198756B - A kind of piezoelectricity and the compound rate of flow of fluid direction measuring device of photoelectricity and its method - Google Patents

A kind of piezoelectricity and the compound rate of flow of fluid direction measuring device of photoelectricity and its method Download PDF

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CN104198756B
CN104198756B CN201410431303.9A CN201410431303A CN104198756B CN 104198756 B CN104198756 B CN 104198756B CN 201410431303 A CN201410431303 A CN 201410431303A CN 104198756 B CN104198756 B CN 104198756B
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cylinder
fluid
flow
piezoelectric fabric
laser
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CN104198756A (en
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陈学东
朱连利
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Huazhong University of Science and Technology
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Abstract

The invention discloses a kind of piezoelectricity and the compound flow rate of liquid direction measuring device of photoelectricity and its method, device includes cylinder, piezoelectric fabric beam, Laser emission collimating module, elastic colloid, base, Two-dimensional PSD displacement transducer, PSD is carried and signal amplification circuit plate, and measured data processing module;The present invention utilizes elastic cylinder and the piezoelectric fabric beam installed in cylinder inside center axis area, yaw motion by the flow transition of fluid for the cylinder in immersion fluid, and piezoelectric fabric beam deflects with cylinder and produces pressure difference, deflection and the relation of fluid flow direction using cylinder, and piezoelectric fabric beam pressure difference and the relation of rate of flow of fluid, realize the flow velocity of fluid and the measurement of flow direction.The present invention is simple in construction, and build is compact, it is possible to reduce the disturbance of convection body, is particularly suitable for the accurate measurement of low speed information of flow.The device may be mounted at the periphery of Large Underwater vehicle equipment or platform, there is provided the monitoring of its peripheral information of flow.

Description

A kind of piezoelectricity and the compound rate of flow of fluid direction measuring device of photoelectricity and its method
Technical field
The invention belongs to fluid measurement technology, relate to a kind of devices and methods therefor for measuring rate of flow of fluid flow direction, specifically Say on ground, it is proposed that a kind of flow rate and direction measuring device being combined using piezo technology and photoelectric technology and method.
Background technology
Current flow velocity fields of measurement, typically using rotating mechanisms such as propellers, fluid stream is out-of-date, promotes the rotation such as propeller Rotation mechanism is rotated, and rate of flow of fluid is obtained after the speed conversion that rotating mechanism is rotated.This metering system, for fluid velocity compared with Environment that is high, not needing real―time precision measurment is feasible, but environment and flow velocity for needing precision real time measuring are small The measurement of fluid, error is larger caused by the mechanically operated hysteresis reason of its rotating mechanism, and often measurement effect is bad, together When, rotating machinery structure result in the reliability of this equipment and the life-span is affected, and long-term use can cause accumulated error, separately Outside, often configuration is larger for current current meter, causes the disturbance of fluid flow process, is unfavorable for needing accurately keeping fluidity The measurement of shape.Equipment for flow velocity and flow direction can be measured simultaneously, at present mainly using Ultrasonic Doppler techniques, laser technology Deng although fluid environmental data can be measured accurately, cost is higher, involves great expense, and complicated, body and auxiliary device Build is not larger, easy to operate, is not easy to install and use on vehicle equipment under water as measuring table, and laser measuring technique is muddy Muddy water body should not use.
The content of the invention
The present invention provides a kind of piezoelectricity and the compound rate of flow of fluid direction measuring device of photoelectricity and its method, it is therefore intended that is Fluid inspection provides a kind of convenience, effective, metering system easily and quickly.
A kind of rate of flow of fluid direction measuring device provided by the invention, it is characterised in that the device is using Elastic Circular Cylinder and the piezoelectric fabric beam installed in cylinder inside center axis area, by the flow transition of fluid in immersion fluid Cylinder yaw motion, and piezoelectric fabric beam with cylinder deflect produce piezoelectric charge, its both ends produce voltage difference, profit The relation flowed to the deflection of cylinder with fluid, and piezoelectric fabric beam voltage difference and the relation of rate of flow of fluid, realize fluid Flow velocity and flow direction measurement.
As the preferred of above-mentioned technical proposal, the specific implementation structure of apparatus of the present invention is:The device also includes laser and sent out Penetrate collimating module, elastic colloid, base, Two-dimensional PSD displacement transducer, PSD carryings and signal amplification circuit plate, measurement data Processing module;
Elastic colloid is arranged on base, and cylinder is arranged on elastic colloid, and cylinder is adopted with elastic colloid It is integrally formed with same elastomeric material, piezoelectric fabric beam is located at the top of cylinder, and piezoelectric fabric beam both ends are separately installed with Piezoelectricity colelctor electrode, is responsible for collecting electric charge caused by piezoelectric fabric both ends, and two piezoelectricity colelctor electrode opposite polarities are to form voltage difference;
Laser emission collimating module is arranged on the bottom of cylinder, and Laser emission collimating module lower end passes through elastic colloid Chassis interior is entered, Laser emission collimating module is used for the laser beam for launching collimation;
The Two-dimensional PSD displacement transducer of electric signal connection, PSD carryings and signal successively is installed with base cavity pocket to put Large circuit board and measured data processing module;
The bottom center of base is provided with waterproof signal wire converting interface;Waterproof signal wire converting interface is used to transmit data, also For providing power supply for measured data processing module, Laser emission collimating module, PSD carryings and signal amplification circuit plate;
Measured data processing module electrically connects with the piezoelectricity colelctor electrode at piezoelectric fabric beam both ends, obtains the pressure of piezoelectric fabric beam Piezoelectric voltage signal, to obtain the flow velocity of fluid;
Two-dimensional PSD displacement transducer is used for the laser beam for receiving the outgoing of Laser emission collimating module, Two-dimensional PSD displacement sensing Electric signal caused by generation photovoltaic reaction is input to PSD carryings and signal amplification circuit plate, PSD carryings and signal amplification electricity by device Electric signal after amplification is supplied to measured data processing module by road plate;Measured data processing module obtains PSD carryings and signal Measurement signal after magnification circuit plate amplification, the coordinate value at laser beam spot center is calculated, to obtain the flow direction of fluid.
The measuring method of above-mentioned flow rate and direction measuring device provided by the invention, the measured data processing module are pressed The surface voltage V of electric fibre bundlep, fluid velocity v is calculated using Formulas I:
Formulas I
In formula, VpFor the surface voltage of piezoelectric fabric beam, CsFor piezoelectric fabric Shu Benshen static capacities, Ep、IpRespectively press The modulus of elasticity of electric fibre bundle, the moments of inertia, Esm、IsmThe respectively modulus of elasticity of cylinder, the moments of inertia, dpFor the piezoelectricity of piezoelectric fabric beam Constant, ρ are fluid density, and A is the active area of fluid on the cylinder, CdFor the dragging force coefficient as cylinder, l is circle The length of cylinder, rpFor piezoelectric fabric area of beam radius;
Coordinate value (the x for the laser facula that the measured data processing module is obtained using Two-dimensional PSD displacement transducert, yt), calculate fluid flow direction angle, θ using Formula II:
Formula II.
The present invention provides a solution for fluid fixed point monitoring.Apparatus of the present invention are simple in construction, and build is compact, can To reduce the disturbance of convection body, the flow velocity of fluid is measured using piezo technology, the flow direction of fluid is measured using photoelectricity location technology, The two dimensional fluid information parallel with measurement apparatus base plane can be obtained, the device in embodiment can be measured from 0 to 10m/s Flow velocity, precision realizes the essence for flowing to DATA REASONING, being particularly suitable for low speed information of flow of 0-360 degree up to 0.001m/s Really measurement.By the material and quantity that select corresponding piezoelectric fabric, it is possible to achieve larger range of flow velocity measurement, in theory may be used To realize the measurement of 0-50m/s flow velocitys, the scope of direction finding is plane 0-360 degree.The device can also be arranged on Large Underwater The periphery of vehicle equipment or platform, there is provided the monitoring of its peripheral information of flow.
Brief description of the drawings
Fig. 1 is measurement apparatus exemplary construction schematic diagram provided by the invention;
Fig. 2 a are the sectional view of cylinder, and Fig. 2 b are the sectional view of piezoelectric fabric beam;
Fig. 3 is Laser emission collimating module structure chart;
Fig. 4 is deformation schematic diagram of the device under fluid impact;
Fig. 5 is the demarcation schematic diagram that tests the speed;
Fig. 6 is direction finding plane spot motion schematic diagram;
In figure, 1 is cylinder, and 2 be piezoelectric fabric beam, and 3 be Laser emission collimating module, and 4 be elastic colloid, and 5 be bottom Seat, 6 be Two-dimensional PSD displacement transducer, and 7 be PSD carryings and signal amplification circuit plate, and 8 be measured data processing module, and 9 be anti- Water signal wire converting interface, 10 be board support post, and 12 be upper piezoelectricity colelctor electrode, and 13 be upper piezoelectricity colelctor electrode output lead, 14 It is lower piezoelectric colelctor electrode output lead for lower piezoelectric colelctor electrode, 15,16 be laser driven module, and 17 be laser diode, and 18 are Collimation lens, 19 be small loophole, and 20 copper radiating tubes, 21 be heat-conduction plastic pipe, and 22 be buncher, and 23 lead for straight line Rail, 24 be drawstring, and 25 be objective table, and 26 be tank, and 27 be water, and 11 be housing.
Embodiment
The embodiment of the present invention is described further below in conjunction with the accompanying drawings.Herein it should be noted that for The explanation of these embodiments is used to help understand the present invention, but does not form limitation of the invention.It is in addition, disclosed below As long as each embodiment of the invention in involved technical characteristic do not form conflict can each other and be mutually combined.
The defects of in order to overcome existing flow velocity, flow directional detection method, and the synchronization of flow rate and direction measurement is completed, the present invention Using the indirect method of measurement, the flow transition of fluid is transported to immerse in fluid the deflection for the cylinder being fixed on elastic base Dynamic, the cylinder inside center axis area is provided with piezoelectric fabric beam, by deflection angle, the yawing moment of establishing cylinder Measured with the relational implementation of rate of flow of fluid, flow direction.
As shown in figure 1, measurement apparatus provided by the invention includes cylinder 1, piezoelectric fabric beam 2, Laser emission collimation mould Block 3, elastic colloid 4, base 5, Two-dimensional PSD (Position Sensitive Detector) displacement transducer 6, PSD carryings And signal amplification circuit plate 7, measured data processing module 8, upper piezoelectricity colelctor electrode 12, and lower piezoelectric colelctor electrode 14.
Elastic colloid 4 is arranged on base 5, and cylinder 1 is arranged on elastic colloid 4, cylinder 1 and elastic damping Body 4 uses same elastomeric material, is integrally formed, and modulus of elasticity is in more than 2.5MPa, and hardness is between shore A40-60.Cylinder Piezoelectric fabric beam 2 and Laser emission collimating module 3 are installed, piezoelectric fabric beam 2 is located at the inside center axis of cylinder 1 in body 1 Region, the length of piezoelectric fabric beam 2 are preferably 3/4 or so of the overall length of cylinder 1, and the upper end of piezoelectric fabric beam 2 is provided with piezoelectricity Colelctor electrode 12.The lower end of piezoelectric fabric beam 2 is provided with lower piezoelectric colelctor electrode pole 14, and is fixed on the outer of Laser emission collimating module 3 On shell.Upper piezoelectricity colelctor electrode 12 and lower piezoelectric colelctor electrode 14, it is responsible for collecting two electrode poles of electric charge caused by piezoelectric fabric both ends Property is on the contrary, so as to form voltage difference.
The lower end of Laser emission collimating module 3 is entered inside base 5 through elastic colloid 4, Laser emission collimating module 3 It is responsible for the laser beam of transmitting collimation.In embodiment, the internal cavity of base 5 is a radial confined space of entirety, in putting The purpose for penetrating shape is to coordinate the motion of laser.
Two-dimensional PSD displacement transducer 6, PSD carryings and signal amplification circuit plate 7 are installed with the cavity of base 5 and is surveyed Measure data processing module 8.
PSD is carried and signal amplification circuit plate 7 is installed with measured data processing module 8 using stacking, centre circuit board Support column 10 is connected and fixed to the bottom surface of base 5, and the bottom center of base 5 is provided with waterproof signal wire converting interface 9.Waterproof is believed Number line converting interface 9 is used to transmit data, be additionally operable to for measured data processing module 8, Laser emission collimating module 3, PSD carryings and Signal amplification circuit plate 7 provides power supply.
Measured data processing module 8 is connected by upper piezoelectricity colelctor electrode output lead 13 with upper piezoelectricity colelctor electrode 12, is passed through Lower piezoelectric colelctor electrode output lead 15 is connected with lower piezoelectric colelctor electrode 14, obtains the piezoelectric voltage signal of piezoelectric fabric beam 2, and is counted Calculation obtains the flow velocity of liquid.
Two-dimensional PSD displacement transducer 6 is used for the laser beam for receiving the outgoing of Laser emission collimating module 3, and Two-dimensional PSD displacement passes Photovoltaic reaction occurs for sensor 6, and electric signal is input into PSD carryings and signal amplification circuit plate 7.PSD is carried and signal amplification electricity Road plate 7 is responsible for amplifying and being transferred to measured data processing module 8 measurement signal that Two-dimensional PSD displacement transducer 6 is sent carrying out Processing.Measured data processing module 8 obtains the coordinate value of spot center using the measurement signal, and the flow direction of fluid is calculated.
Measured data processing module 8 is mainly handled measurement data and exported and set to outside using intelligent chips such as single-chip microcomputers It is standby.
The structure of Laser emission collimating module 3 is as shown in figure 3, mainly by housing 11, Laser Driven mould in present example Block 16, laser diode 17 and collimation lens 18 are formed, and housing 28 is hollow cylindrical, and laser driven module 16 is located at housing 28 Top, laser diode 17 are located at the top of housing 28, and collimation lens 18 is located at the bottom of housing 28.Laser diode 17 is launched Laser, reaches collimation lens 18, and the laser scattered after collimated processing converges to form a laser beam.The bottom of housing 28 is provided with micro- Small loophole 19.Small loophole 19 ensure that collimated shoot laser beam is reached caused by Two-dimensional PSD displacement transducer 6 Spot diameter is sufficiently small.
Housing 28 can use copper radiating tube 20 composition nested with heat-conduction plastic pipe 21, main to play radiating and fixed work With.
Measured data processing module 8 input through PSD carrying and signal amplification circuit plate 7 amplify after measurement signal and to it Handled, finally exported result.Measured data processing module 8 includes signal input interface, and analog and digital signal conversion is single Member, single-chip microcomputer, and signal output interface etc..Single-chip microcomputer is main signal treatment element, defeated from Two-dimensional PSD displacement transducer 6 The light spot position signal gone out is input to list after signal input interface and the amplification of analog and digital signal converting unit and analog-to-digital conversion Computing in piece machine, the position coordinates of hot spot is obtained, then exported through signal output interface.Single-chip microcomputer can be 51 single-chip microcomputers, can be with It is PIC single chip microcomputer, or others etc., as long as digital operation can be realized and have multichannel input and output, by facula position After acquisition of information, flow velocity direction value and velocity amplitude are calculated using the measuring method of the present invention.
Measuring method provided by the present invention is as follows:
As shown in figure 4, under flowing water impact, piezoelectric fabric beam 2 twists bending, generation piezoelectric signal, piezoelectric fabric The colelctor electrode at the both ends of beam 2 produces electric charge respectively, and forms pressure difference, generation piezoelectric voltage signal V, that is, piezoelectric fabric beam 2 Surface voltage Vp, with flow velocity v increase, the increase of the degree of crook of piezoelectric fabric beam 2, piezoelectric signal becomes strong, and voltage signal V also increases Add, and to include piezoelectric fabric beam 2 and the cylinder 1 of Laser emission collimating module 3 persistently deflects, Laser emission is accurate The laser direction that straight module 3 is sent also persistently deflects, and the facula position on Two-dimensional PSD position sensor 6 also persistently deflects, and The yawing moment of hot spot and the direction of fluid impact are just the opposite, conversely, with flow velocity v reduction, piezoelectric fabric beam 2 bends journey Degree reduces, and piezoelectric signal dies down, and voltage signal V also reduces, in the presence of elastic colloid 4, still such that including piezoelectricity The cylinder 1 of fibre bundle 2 and Laser emission collimating module 3 persistently deflects, but amount of deflection gradually decreases, until fluid velocity Zero is reduced to, cylinder 1 is returned to initial position, and the laser direction that Laser emission collimating module 3 is sent also returns to initial position, For the center of Two-dimensional PSD displacement transducer 6.So, position coordinates of the laser facula on Two-dimensional PSD position sensor is measured, It can obtain corresponding fluid flow direction, i.e. photoelectric measurement method in the present invention;Establish piezoelectric voltage signal V and flow velocity v Relational expression, measurement piezoelectric voltage signal V size, you can the size of rate of flow of fluid corresponding to obtaining.
The present invention uses piezo technology method, establishes comprising the concrete steps that for piezoelectric voltage signal V and flow velocity v relational expression:
1. the relation between rate of flow of fluid and the stress and deformation of cylinder 1 is:
Fluid impacts the power applied to cylinder 1
Wherein, ρ is fluid density, and v is fluid velocity, and A is active area of the fluid on cylinder 1, CdFor as circle The dragging force coefficient of cylinder 1.
2. the stress of cylinder 1 produces moment M
Wherein, l is the length of cylinder 1.
3. after the overall flexural deformation simultaneously that cylinder 1 forms with piezoelectric fabric beam 2, there is following relation:
M=Mp+Msm (3)
Wherein, MpFor 2 bending moments of piezoelectric fabric beam, MsmFor 1 bending moment of cylinder, Ep、IpRespectively piezoelectric fabric beam 2 modulus of elasticity, the moments of inertia, Esm、IsmThe respectively modulus of elasticity of cylinder 1, the moments of inertia, ξ are overall radius of curvature, and M is overall Moment of flexure.
4. simultaneous formula (1) (2) (3) (4),
Obtain moment M suffered by piezoelectric fabric beam 2pFor:
Obtaining the curvature ξ that piezoelectric fabric beam 2 is bent is
5. with reference to figure 2, establish by x, r,The circular cylindrical coordinate axle of three directions composition, wherein, x-axis perpendicular to cross-wise direction, R axles were that radial direction is pointed in the section center of circle of piezoelectricity fibre bundle 2,For circumferencial direction, the strain s for obtaining piezoelectric fabric beam 2 is
6. the dielectric displacement D for obtaining piezoelectric fabric beam 2 is:
Wherein, dpFor the piezoelectric constant of piezoelectric fabric beam 2.
7. the charge number Q on the surface of piezoelectric fabric beam 2pFor
Wherein, rpFor the section radius of piezoelectric fabric beam 2.
8. anti-solution formula (9), obtaining rate of flow of fluid v is
Wherein, QpFor charge number caused by piezoelectric fabric beam 2.
Measure charge number Q caused by piezoelectric fabric beam 2p, you can the flow velocity v of fluid is calculated by formula (10).
Further, because piezoelectric fabric beam 2 itself produces quantity of electric charge Qp, cause its surface voltage VpChange, between the two With relation
Wherein, Cs, can be by measuring the surface voltage V of piezoelectric fabric beam 2 for the static capacity of piezoelectric fabric beam 2 itselfp To corresponding quantity of electric charge Qp
Simultaneous formula (10) (11), is obtained
In formula, v is fluid velocity, VpFor the surface voltage of piezoelectric fabric beam 2, CsFor the direct capacitance of piezoelectric fabric beam 2 itself Amount, Ep、IpThe respectively modulus of elasticity of piezoelectric fabric beam 2, the moments of inertia, Esm、IsmThe respectively modulus of elasticity of cylinder 1, the moments of inertia, dp For the piezoelectric constant of piezoelectric fabric beam 2, ρ is fluid density, and A is active area of the fluid on cylinder 1, CdFor as cylinder The dragging force coefficient of body 1, l be cylinder 1 length, rpFor the section radius of piezoelectric fabric beam 2.
Obtain, usually, flow velocity v and voltage VpWith following functional relation
Further, to improve the degree of accuracy, relational expression (13) is expanded into embodiment:
A, b are weight coefficient, and further, measured multi-group data, is obtained by curve matching when can take demarcation Speed v and VpOther forms expression formula, specifically can pass through demarcate obtain.
In actual applications, can be by directly to inserting in cylinder 1 in order to obtain accurate coefficient in formula (14) Piezoelectric fabric beam 2 is demarcated, and obtains the relation that fluid velocity produces voltage with piezoelectric fabric beam 2, hydrostatic can be used to demarcate Method, it can also use fluid jet.Hydrostatic standardization is employed in this example, as shown in Figure 5:
A certain amount of water 27, water remains stationary are placed in tank 26.The top of tank 26 sets up line slideway 23, and straight line is led Slidable objective table 25 is installed, by drawstring 24, objective table 25 links together with buncher 22, speed governing electricity on rail 23 Machine 22 rotates, scrolling drawstring 24, objective table 25 is moved towards the direction of buncher 22, the bottom of objective table 25 is provided with this hair Bright described measurement apparatus, the base 5 of device are fixed on objective table 25, ensure that cylinder 1 all gos deep into water, while base 5 do not influence to slide the change of the middle water surface.During demarcation, the remote buncher 22 on line slideway 23 with cylinder 1 of objective table 25 One end, in hydrostatic, starting buncher 22 simultaneously makes it remain at a speed so that drawstring 24 pull objective table 25 and Cylinder 1 is moved with a constant speed v, and instantaneous voltage V caused by piezoelectric fabric beam 2 is obtained by the measurement device of the present inventionp, note The lower constant speed v and voltage V of recordp, the speed of buncher 22 is constantly adjusted, repeats the above steps, records corresponding piezoelectric fabric Magnitude of voltage V caused by beam 2p, the data more than 10 groups are obtained, the functional form according to formula (14) carries out curve matching, you can To the coefficient a, b of formula (14) occurrence.
Further, by using the material and quantity of different piezoelectric fabric beams 2, measuring environment is reached to piezoelectric fabric Modulus of elasticity required for beam 2, different coefficient a, b can be obtained, so as to extend the measurement range of device.Theory measurement model 0-50m/s can be reached by enclosing.
The present invention uses photoelectric technology method, and measurement stream direction of flow comprises the concrete steps that:
Power launches laser in the laser diode 17 of mW levels, reaches collimation lens 18, and what is scattered after collimated processing swashs Light converges to form a laser beam, is radiated on Two-dimensional PSD displacement transducer 6.After water impact cylinder 1, cylinder 1 occurs Deflection, Laser emission collimating module 3 is driven also to deflect, yawing moment is in opposite direction with water movement, Laser emission collimation Hot spot of the laser beam that module 3 is sent on Two-dimensional PSD displacement transducer 6 is also moved, the hot spot geo-stationary position The direction at the center of Two-dimensional PSD displacement transducer 6 is also in opposite direction with water movement.Rectangular coordinate system as shown in Figure 6 is established, just Begin the moment, without the percussion of current, cylinder 1 is perpendicular to the bottom surface of base 5, and laser facula is in Two-dimensional PSD displacement sensing The center of device 6, as the origin of coordinate system, now fluid velocity is 0, as shown in fig. 6, remembering that the initial point is origin O, is built Vertical rectangular coordinate system so that the x-axis of coordinate system, the y-axis plane coordinate system respective shaft weight with Two-dimensional PSD displacement transducer 6 respectively Close.
After starting measurement, Two-dimensional PSD displacement transducer 6 receives electric signal caused by laser beam, and carries and believe by PSD Number magnification circuit plate 7, measured data processing module 8 are handled, and obtain hot spot of the laser facula on Two-dimensional PSD displacement transducer 6 Coordinate value is the coordinate (x of M points in rectangular coordinate systemt,yt), the coordinate value is for origin and reference axis, with fluid impact Effect forms vector change, and the direction of the vector is just the opposite with fluid flow direction, that is, measures the current operation side of fluid To with base 5 plane parallel two dimensional surface on, direction is vectorReverse direction, i.e. respective coordinates (- xt,-yt) Vector direction, be dotted arrow direction in Fig. 6.
I.e. with the rectangular coordinate system as shown in Figure 6 of foundation, fluid flow direction angle, θ be with the positive direction of x-axis To play initial line, the angle using fluid direction of motion as end edge is
Measurement data is output to specified location by waterproof signal wire converting interface 9, completes measurement.Example:
Silica gel of the modulus of elasticity in 3.0MPa hardness for shore A52 is used in the present embodiment, elastic colloid 4 is disk Shape, internal diameter 3mm, external diameter 10mm, thickness 2.5mm, cylinder 1 length 100mm, diameter 3mm.Piezoelectric fabric beam 2 is pressed using PVDF Electric fibre bundle, length 75mm, it is made up of 20 PVDF piezoelectric fabrics, maximum can produce 35.00mV voltage, its modulus of elasticity For 0.5GPa.Measured data processing module 8 uses single-chip microcomputer.
Use material of the conductive rubber as elastic wire 11 in embodiment, laser power is 50mW in embodiment, through standard Lasing beam diameter is no more than 1.2mm, small loophole 19 diameter 1mm, spot diameter 1mm after straight.
Piezoelectric voltage V when being tested the speed in embodimentpThere is functional relation with flow velocity v:
The scope to test the speed is 0m/s-10m/s, precision 0.001m/s,
Bearing zone is 0 ° to 360 °.
Described above is presently preferred embodiments of the present invention, but the present invention should not be limited to the embodiment and accompanying drawing institute Disclosure.So every do not depart from the lower equivalent or modification completed of spirit disclosed in this invention, guarantor of the present invention is both fallen within The scope of shield.

Claims (5)

1. a kind of rate of flow of fluid direction measuring device, it is characterised in that the device includes Laser emission collimating module, elastic damping Body, base, Two-dimensional PSD displacement transducer, PSD carryings and signal amplification circuit plate, measured data processing module, utilize Elastic Circular Cylinder and the piezoelectric fabric installed in cylinder inside center axis area, by the flow transition of fluid in immersion fluid The yaw motion of cylinder, and piezoelectric fabric beam with cylinder deflect caused by piezoelectric charge in voltage caused by its both ends Difference, deflection and the relation of fluid flow direction using cylinder, and piezoelectric fabric beam voltage difference and the relation of rate of flow of fluid, are realized The flow velocity of fluid and the measurement of flow direction;
The elastic colloid is arranged on base, and cylinder is arranged on elastic colloid, and cylinder is adopted with elastic colloid It is integrally formed with same elastomeric material, piezoelectric fabric beam is located at the top of cylinder, and piezoelectric fabric beam both ends are separately installed with Piezoelectricity colelctor electrode, is responsible for collecting electric charge caused by piezoelectric fabric both ends, and two piezoelectricity colelctor electrode opposite polarities are to form voltage difference;
The Laser emission collimating module is arranged on the bottom of cylinder, and Laser emission collimating module lower end passes through elastic colloid Chassis interior is entered, Laser emission collimating module is used for the laser beam for launching collimation;
The base internal cavity is installed with the Two-dimensional PSD displacement transducer of electric signal connection, PSD carryings and signal successively and put Large circuit board and measured data processing module;The base internal cavity is a radial confined space of entirety, to coordinate The emission state of laser;
The bottom center of the base is provided with waterproof signal wire converting interface;Waterproof signal wire converting interface is used to transmit data, also For providing power supply for measured data processing module, Laser emission collimating module, PSD carryings and signal amplification circuit plate;
The measured data processing module electrically connects with the piezoelectricity colelctor electrode at piezoelectric fabric beam both ends, obtains the pressure of piezoelectric fabric beam Piezoelectric voltage signal, to obtain the flow velocity of fluid;
The Two-dimensional PSD displacement transducer is used for the laser beam for receiving the outgoing of Laser emission collimating module, and Two-dimensional PSD displacement passes Electric signal caused by generation photovoltaic reaction is input to PSD carryings and signal amplification circuit plate, PSD carryings and signal amplification by sensor Electric signal after amplification is supplied to measured data processing module by circuit board;Measured data processing module obtains PSD carryings and letter Measurement signal after the amplification of number magnification circuit plate, the coordinate value at laser beam spot center is calculated, to obtain the flow direction of fluid.
A kind of 2. rate of flow of fluid direction measuring device according to claim 1, it is characterised in that the cylinder with it is described The modulus of elasticity of elastic colloid is in more than 2.5MPa, and hardness is between shore A40-60.
A kind of 3. rate of flow of fluid direction measuring device according to claim 1 or 2, it is characterised in that the piezoelectric fabric The length of beam is the 3/4 of the cylinder overall length.
A kind of 4. rate of flow of fluid direction measuring device according to claim 1 or 2, it is characterised in that the Laser emission Collimating module is mainly made up of housing, laser driven module, laser diode and collimation lens, and housing is hollow cylindrical, is swashed Optical drive module is located at case top, and laser diode is located at the top of housing, and collimation lens is located at the bottom of housing;Laser two Pole pipe launches laser, reaches collimation lens, and the laser scattered after collimated processing converges to form a laser beam;Housing bottom is set There is small loophole, to ensure that collimated shoot laser beam reaches spot diameter foot caused by Two-dimensional PSD displacement transducer It is enough small.
5. a kind of method that device using described in claim 1 or 2 carries out rate of flow of fluid flow directional detection, it is characterised in that institute State the surface voltage V that measured data processing module obtains piezoelectric fabric beamp, fluid velocity v is calculated using Formulas I:
In formula, VpFor the surface voltage of piezoelectric fabric beam, CsFor piezoelectric fabric Shu Benshen static capacities, Ep、IpRespectively piezoelectricity is fine Tie up modulus of elasticity, the moments of inertia of beam, Esm、IsmThe respectively modulus of elasticity of cylinder, the moments of inertia, dpPiezoelectricity for piezoelectric fabric beam is normal Number, ρ are fluid density, and A is the active area of fluid on the cylinder, CdFor the dragging force coefficient as cylinder, l is cylinder The length of body, rpFor piezoelectric fabric area of beam radius;
Coordinate value (the x for the laser facula that the measured data processing module is obtained using Two-dimensional PSD displacement transducert,yt), profit Fluid flow direction angle, θ is calculated with Formula II:
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