CN113791461A - Transduction structure of piezoelectric rainfall sensor and installation method thereof - Google Patents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01W—METEOROLOGY
- G01W1/00—Meteorology
- G01W1/14—Rainfall or precipitation gauges
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
Abstract
The invention relates to the technical field of meteorological monitoring rainfall in a meteorological station, in particular to an energy conversion structure of a piezoelectric rainfall sensor and an installation method thereof, wherein the energy conversion structure comprises a shell, a circular piezoelectric plate, a support and a rectangular piezoelectric plate, a sheet-shaped cantilever structure is arranged on the periphery of the shell, a concave surface is arranged at the center of the shell, the circular piezoelectric plate is adhered to the concave surface at the center of the shell, the rectangular piezoelectric plate is adhered to both sides of the cantilever structure, and the support is fixed below the shell; the central area with strong impact resistance and the surrounding cantilever beam bimorph structure with high sensitivity are designed, the problems that the output signal of the traditional piezoelectric type rainfall sensor transduction structure is weak and the test on the small rainfall is insensitive under the small rainfall are solved, the measurement of large rainfall and small rainfall can be considered, and the early warning capability of a meteorological instrument and the like on natural disasters such as flood, drought, landslide and the like is improved.
Description
Technical Field
The invention relates to the technical field of rainfall monitoring of meteorological stations, in particular to a transduction structure of a piezoelectric rainfall sensor and an installation method of the transduction structure.
Background
Rainfall is a key element in meteorological observation, timely and accurately acquiring rainfall data plays an important role in preventing and controlling natural disasters such as flood, drought, landslide and the like, and a rain gauge is required for observing the rain. The conventional rain gauge is a piezoelectric rain gauge, which is also called a piezoelectric rain sensor, and comprises a shell, a piezoelectric sensing element, a signal acquisition circuit and the like, wherein the piezoelectric rain sensor converts an impact signal of raindrop falling into an electric signal, and can calculate the particle size of a single raindrop, the raindrop spectrum distribution, the rainfall intensity and the accumulated rainfall in a period of time by acquiring and processing an output signal of the piezoelectric sensing element.
The utility model provides a piezoelectric type rain gauge structure has been proposed in the patent CN210803754U, including holding the lid, piezoelectric element, parts such as support and control treater, adopt the mode that piezoelectric element and control treater are connected, hold the vibrations transmission that the lid produced through hitting the rainwater and give piezoelectric element, piezoelectric element transmission signal gives control treater, according to the voltage signal that has inputed in the control treater and current rainfall corresponding relation algorithm, reach the effect of measuring rainfall size, it is the arch for circular and top all around to hold the lid wherein, this structural feature is shock resistance reinforce, nevertheless structure vibration range is little when having little rainfall simultaneously, the little shortcoming of output voltage signal, a new construction needs to be proposed, can realize the accurate measurement to little rainfall, solve the problem that current structure is difficult to measure little rainfall.
Disclosure of Invention
In order to solve the technical problems that the output signal of the traditional piezoelectric type rainfall sensor transduction structure is weak under small rainfall, the measurement on the small rainfall is not accurate, and the measurement on the large rainfall and the small rainfall cannot be simultaneously considered, the invention provides the transduction structure of the piezoelectric type rainfall sensor and the installation method thereof, wherein the transduction structure comprises a shell 11, a circular piezoelectric plate 12, a support 13 and a rectangular piezoelectric plate 14, a sheet-shaped cantilever structure 15 is arranged on the periphery of the shell 11, a concave surface is arranged at the center of the shell 11, the circular piezoelectric plate 12 is adhered to the concave surface at the center of the shell 11, the rectangular piezoelectric plate 14 is adhered to the front side and the back side of the cantilever structure 15, and the support 13 is fixed below the shell 11;
further, the cantilever structure 15 is a rectangular piece with equal size and extending from the circumferential edge of the housing 11 at equal intervals;
further, the cantilever structures 15 are fan-shaped pieces extending from the circumferential edge of the shell 11 at equal intervals, the length and the width of the fan-shaped pieces are sequentially increased, and all the cantilever structures 15 at the edge of the shell 11 form a fibonacci spiral shape;
further, the support 13 includes a base and a support frame, the base is uniformly provided with a plurality of support frames, the support frames are fixedly connected with the housing 11, contact points with the housing 11 are as few as possible, the contact points are as small as possible, the contact area is too large, the contact points are too many, and the vibration of the structure is influenced;
further, the rigid adhesives used between the housing 11 and the circular piezoelectric plate 12 and between the rectangular piezoelectric plate 14 and the cantilever structure 15 include, but are not limited to, epoxy resin, anaerobic adhesive, and AB adhesive;
further, the piezoelectric material used for the circular piezoelectric sheet 12 includes, but is not limited to, piezoelectric ceramics, piezoelectric single crystals, piezoelectric polymers, and piezoelectric composites;
furthermore, the shell 11 and the circular piezoelectric sheet 12 and the rectangular piezoelectric sheet 14 and the cantilever structure 15 can be connected and fixed by gold bonding, silver electrode sintering or anodic bonding;
further, the fixing manner between the bracket 13 and the housing 11 includes, but is not limited to, screw fixing, ultrasonic welding and laser welding;
further, the housing 11 is made of stainless steel;
furthermore, elastic holes are uniformly formed in the position, close to the cantilever structure 15, of the shell 11, the elastic hole structure is a through hole or a groove, so that the elasticity of the edge part of the shell 11 can be increased, the shell is easy to deform, and crosstalk between the peripheral cantilever structure and the inner circular transduction structure is reduced during active driving test.
Furthermore, the elastic holes are rectangular or circular, and a layer of piezoelectric material is bonded on the front surface of the shell 11 around each elastic hole, so that the volume of the piezoelectric material is enlarged, and a better transduction effect is obtained.
The method for installing the transduction structure of the piezoelectric rainfall sensor comprises the following steps:
1) carrying out ultrasonic cleaning on the shell 11, the circular piezoelectric patches 12, the bracket 13 and the rectangular piezoelectric patches 14, washing off oil stains on the surfaces of the structure and the elements to ensure the bonding effect, putting the cleaned structure and the elements into a stainless steel tray padded with dust-free paper, heating and drying the structure and the elements by using an electrothermal blowing drying box, and naturally cooling the structure and the elements for later use;
2) placing the concave surface of the shell 11 upwards on an annular fixing clamp, keeping the edge horizontal, and applying an adhesive to the central concave surface of the shell 11;
3) horizontally placing the circular piezoelectric patch 12 on the central concave surface of the shell 11, extruding the adhesive by utilizing the self gravity, removing the glue overflowing around in time, placing a heavy object on the circular piezoelectric patch 12, placing a level gauge on the surface of the heavy object, and finely adjusting the position of the circular piezoelectric patch 12 to enable the level gauge to be in a horizontal state within a horizontal range, wherein the positions of the circular piezoelectric patch 12 and the shell 11 are in a horizontal state, so that the adhesive is cured;
4) placing the bonded circular piezoelectric sheet 12 and the shell 11 into a special die for bonding sheets, coating the bonding agent on the cantilever structure 15 of the shell 11, and curing in the same manner as in the step 3);
5) the round piezoelectric plate 12 and the rectangular piezoelectric plate 14 adopt a flanging electrode mode to lead out a negative electrode or utilize the conductivity of the shell 11 as the negative electrode;
6) after the electrical signal extraction operation is completed, the bracket 13 is fixed to the housing to form the final transducing structure.
Compared with the existing piezoelectric rainfall sensor transduction structure, the design provided by the patent takes into account two conditions of heavy rainfall and light rainfall, solves the problem of inaccurate measurement of light rainfall, improves the measurement precision of the piezoelectric rainfall sensor, further improves the early warning capability of a weather instrument and the like to natural disasters such as flood, drought and landslide, has important significance for effectively protecting life and property safety, and has important social and economic benefits.
Drawings
FIG. 1 is a schematic view of a rain sensor transducing structure embodiment 1 of the present invention;
FIG. 2 is a schematic view of embodiment 1 of a metal housing in a transduction structure of a rain sensor according to the present invention;
FIG. 3 is a schematic view of embodiment 2 of the transduction structure of the rainfall sensor according to the present invention;
FIG. 4 is a schematic view of embodiment 2 of a metal housing in a transduction structure of a rain sensor according to the present invention;
FIG. 5 is a schematic representation of a cantilever structure according to the present invention in the form of a Fibonacci helix;
in the drawings: 11-shell, 12-round piezoelectric plate, 13-bracket, 14-rectangular piezoelectric plate, and 15-cantilever structure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a transduction structure of a piezoelectric rainfall sensor, which comprises a shell 11, a circular piezoelectric plate 12, a support 13 and a rectangular piezoelectric plate 14, wherein a sheet-shaped cantilever structure 15 is arranged on the periphery of the shell 11, a concave surface is arranged at the central position of the shell 11, the circular piezoelectric plate 12 is bonded on the concave surface at the center of the shell 11, the rectangular piezoelectric plate 14 is bonded on two surfaces of the cantilever structure 15, and the support 13 is fixed below the shell 11;
preferably, the cantilever structure 15 is a rectangular plate extending from the circumferential edge of the housing 11, and has two structures, namely a large rectangular plate and a small rectangular plate, and a large rectangular plate is arranged between every two small rectangular plates;
preferably, as shown in fig. 1 and fig. 3, the cantilever structure 15 is a rectangular sheet with equal size and extending from the circumferential edge of the housing 11 at equal intervals, so that the contact area of raindrops is more even, and the processing process is simpler;
preferably, as shown in fig. 5, the cantilever structures 15 are fan-shaped pieces extending from the circumferential edge of the housing 11 at equal intervals, the size of the fan-shaped pieces increases sequentially, all the cantilever structures 15 at the edge of the housing 11 form a fibonacci spiral shape, the contact area with rainwater is enlarged, vibration caused by small amount of rainwater is sensed more sensitively, and the measurement is more accurate.
The shape and size of the cantilever structure 15 can be one of the three structures, and can also be adjusted according to actual conditions and processing techniques.
Specifically, the support 13 includes a base and a support frame, the base is uniformly provided with a plurality of support frames, the support frames are fixedly connected with the housing 11, contact points of the support 13 and the housing 11 are as few as possible, the contact points are as small as possible, the contact area is too large, the contact points are too many, and the vibration of the structure is affected;
preferably, as shown in fig. 1, the bracket 13 is composed of a circular ring and three t-shaped supports, the center of the circular ring is taken as a cross point, every two three t-shaped supports form an angle of 120 degrees and are connected to the edge of the circular ring, and the three t-shaped supports are fixed on the circular ring outside the central concave surface of the housing 11.
The transduction area formed by the shell center position and the circular piezoelectric plate has stronger impact resistance, when the sensor is impacted by raindrops, the mechanical vibration generated by the raindrops impacting the shell of the sensor can be converted into an electric signal by the piezoelectric sensing element, the larger the impact force of the raindrops impacting the sensor is, the larger the vibration amplitude is, the larger the amplitude of the output voltage of the sensing element is, the larger the large rainfall is, the double-wafer structure uniformly distributed around the shell 11 can be actively tested and passively tested, and the accurate measurement of the small rainfall is realized.
The metal shell 11 can be made of stainless steel, the adhesive between the shell 11 and the piezoelectric patch 12 can be rigid adhesives such as epoxy resin, anaerobic adhesive, AB adhesive and the like, the piezoelectric patch 12 can be made of piezoelectric materials such as piezoelectric ceramics, piezoelectric single crystals, piezoelectric polymers, piezoelectric composite materials and the like, the adhesive between the piezoelectric patch 14 and the shell 11 can be rigid adhesives such as epoxy resin, anaerobic adhesive, AB adhesive and the like, and the support frame 13 and the shell 11 can be fixed by screws or by ultrasonic welding, laser welding and the like.
The invention provides another transduction structure of a piezoelectric rainfall sensor, which comprises a shell 11, a circular piezoelectric plate 12, a support 13 and a rectangular piezoelectric plate 14, wherein a sheet-shaped cantilever structure 15 is arranged on the periphery of the shell 11, a concave surface is arranged at the center of the shell 11, the circular piezoelectric plate 12 is adhered to the concave surface at the center of the shell 11, the rectangular piezoelectric plate 14 is adhered to two surfaces of the cantilever structure 15, and the support 13 is fixed below the shell 11; elastic holes are uniformly formed in the position, close to the cantilever structure 15, of the shell 11, the elastic hole structure is set to be a through hole or a groove, the shape of the elastic hole structure is rectangular or circular, a layer of piezoelectric material is bonded to the front face of the shell 11 around each elastic hole, the size of the piezoelectric material capable of generating transduction is enlarged, the elasticity of the edge portion of the shell 11 is increased, and crosstalk between the peripheral cantilever structure and the inner circular transduction structure is reduced during active driving testing.
The transduction structure of the piezoelectric rainfall sensor can be divided into two parts, wherein one part is a transduction area formed by a circular piezoelectric sheet and a metal shell at the center of the shell, has stronger impact resistance and is used for measuring large rainfall; the other part is a piezoelectric bimorph structure which is uniformly distributed on the periphery of the shell and consists of a rectangular piezoelectric sheet and a metal sheet, and active testing and passive testing can be performed. The active test is to adopt alternating voltage to drive the piezoelectric bimorph structure to vibrate, when raindrops attach to the piezoelectric bimorph structure, the vibration frequency and amplitude can change, the equivalent load in the circuit can also change, and the rainfall is detected through the change. During passive detection, driving voltage is not needed, and the rainfall is detected mainly by using a voltage signal generated by impact of raindrops on the structure.
Specifically, during passive testing, a small amount of rain impacts the double-chip structure, so that the piezoelectric chip is deformed, and an electric signal is output; during active test, a water film with a certain thickness is formed on the surface of the bimorph by small rainfall, the water film influences the resonant frequency of the piezoelectric bimorph, the impedance characteristic of the piezoelectric bimorph is tested through the rear-end circuit to obtain the resonant frequency of the piezoelectric bimorph, and the impedance characteristic of the piezoelectric bimorph and the corresponding relation between the resonant frequency and the rainfall can be obtained through a large number of tests, so that the measurement of the small rainfall is realized.
A method for installing a transduction structure of a piezoelectric rainfall sensor comprises the following steps:
1) carrying out ultrasonic cleaning on the shell 11, the piezoelectric plate 12, the piezoelectric plate 14 and the support frame 13, firstly cleaning with absolute ethyl alcohol, then cleaning with acetone, finally cleaning with absolute ethyl alcohol, putting the cleaned object on a stainless steel tray, laying dust-free paper on the tray, then putting the stainless steel tray into an electric heating blowing drying oven for heating and drying, and naturally cooling for later use after drying;
2) placing the concave surface of the shell 11 upwards on an annular fixing clamp, keeping the edge horizontal, preparing an epoxy resin adhesive, and applying the prepared adhesive to the central concave surface of the shell 11, wherein the amount of the adhesive is determined according to the area of the piezoelectric sheet 12, and the larger the area of the piezoelectric sheet 12 is, the more adhesive is needed;
3) horizontally placing the piezoelectric sheet 12 on the central concave surface of the shell 11, extruding and overflowing the adhesive by utilizing the self gravity, removing the glue overflowing around in time, adding an object with a certain weight on the piezoelectric sheet 12 to increase the stability of the extrusion state of the piezoelectric sheet, enabling the upper surface of the weight to be parallel to the surface of the piezoelectric sheet 12, placing a level gauge on the surface of the weight, finely adjusting the position of the piezoelectric sheet 12 to enable the level gauge to be in a horizontal range, enabling the positions of the circular piezoelectric sheet 12 and the shell 11 to be in a horizontal state, and after the position is fixed, finishing the curing of the adhesive according to the curing conditions of the adhesive;
4) after the piezoelectric patch 12 and the shell 11 are bonded, the shell 11 is placed in a special die for bonding patches, the precise positioning between the cantilever structure 15 and the piezoelectric patch 14 around the shell 11 can be realized by the aid of the grinding tool, the same adhesive in the step 2) is coated on the cantilever structure 15 of the shell 11, then the piezoelectric patch 14 is placed on the cantilever structure 15 in parallel, pressure is applied by placing a heavy object above the piezoelectric patch 14, and redundant adhesive is extruded as much as possible. After all the piezoelectric sheets 14 are placed, curing is performed in the same manner as in step 3);
5) the piezoelectric sheets 12 and 14 may be flanged electrodes to lead out the negative electrodes, or may be made of the conductivity of the case 11. If the flanging electrode mode is used, the leads are respectively welded to lead out the positive and negative electrodes of the piezoelectric sheets 12 and 14; if the conductivity of the shell is utilized, a lead needs to be welded to lead out the positive electrode, and the shell is used as the negative electrode;
6) after the electrical signal leading-out operation is completed, the bracket 13 is fixed to the housing 11 by welding or screws, and a final transduction structure is formed.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "disposed," "connected," "fixed," "rotated," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A transduction structure of a piezoelectric rain sensor, comprising: the piezoelectric ceramic comprises a shell (11), a circular piezoelectric sheet (12), a support (13) and a rectangular piezoelectric sheet (14), wherein a sheet-shaped cantilever structure (15) is arranged on the periphery of the shell (11), a concave surface is arranged at the central position of the shell (11), the circular piezoelectric sheet (12) is bonded on the concave surface at the center of the shell (11), the rectangular piezoelectric sheet (14) is bonded on the front surface and the back surface of the cantilever structure (15) of the sheet-shaped structure, and the support (13) is fixed below the shell (11).
2. The piezoelectric rain sensor transduction structure according to claim 1, wherein the cantilever structure (15) is a rectangular plate with equal size and extending from the circumference of the casing (11) at equal intervals.
3. The transduction structure according to claim 1, characterized in that the cantilever structures (15) are fan-shaped pieces extending from the circumferential edge of the shell (11) at equal intervals, the length and the width of the fan-shaped pieces increase sequentially, and all the cantilever structures (15) on the edge of the shell (11) form a Fibonacci spiral shape.
4. The transduction structure of the piezoelectric rain sensor according to claim 1, wherein the support (13) comprises a base and a plurality of supports uniformly arranged on the base, and the supports are fixedly connected with the casing (11).
5. The transduction structure of a piezoelectric rain sensor according to claim 1 or 3, characterized in that the fixing means between the support (13) and the casing (11) is screw fixing, ultrasonic welding or laser welding.
6. The transduction structure according to claim 1, wherein the rigid adhesive used between the casing (11) and the circular piezoelectric plate (12) and between the rectangular piezoelectric plate (14) and the cantilever structure (15) is epoxy, anaerobic adhesive or AB adhesive.
7. The transduction structure of a piezoelectric rain sensor according to claim 1, wherein the shell (11) and the circular piezoelectric plate (12) and the rectangular piezoelectric plate (14) and the cantilever structure (15) can be connected and fixed by gold bonding, silver electrode sintering or anodic bonding.
8. The transduction structure of a piezoelectric rain sensor according to claim 1, wherein the circular piezoelectric sheet (12) is made of piezoelectric material such as piezoelectric ceramic, piezoelectric single crystal, piezoelectric polymer or piezoelectric composite material.
9. The transduction structure according to claim 1, wherein the casing (11) is uniformly provided with elastic holes near the cantilever structure (15), the elastic hole structure is configured as one of a through hole and a groove, the elastic hole is rectangular or circular, and a layer of piezoelectric material is bonded to the front surface of the casing (11) around each elastic hole.
10. A method for mounting a transduction structure of a piezoelectric rain sensor, for mounting the transduction structure of the piezoelectric rain sensor according to any one of claims 1 to 9, comprising the steps of:
1) carrying out ultrasonic cleaning on the shell (11), the circular piezoelectric sheet (12), the bracket (13) and the rectangular piezoelectric sheet (14), putting the cleaned piezoelectric sheet into a stainless steel tray padded with dust-free paper, heating and drying the cleaned piezoelectric sheet by using an electrothermal blowing drying box, and naturally cooling the dried piezoelectric sheet for later use;
2) placing the concave surface of the shell (11) upwards on an annular fixing clamp, keeping the edge horizontal, and preparing an adhesive to be coated on the concave surface of the center of the shell (11);
3) horizontally placing a circular piezoelectric patch (12) on a central concave surface of a shell (11), extruding an adhesive by utilizing self gravity, removing glue overflowing from the periphery in time, placing a heavy object on the circular piezoelectric patch (12), placing a level gauge on the surface of the heavy object, and finely adjusting the position of the circular piezoelectric patch (12) to enable the level gauge to be in a horizontal state, wherein the positions of the circular piezoelectric patch (12) and the shell (11) are in a horizontal state, so that the adhesive is cured;
4) putting the bonded circular piezoelectric sheet (12) and the shell (11) into a sheet-bonding special die, coating the adhesive on the cantilever structure (15) of the shell (11), and curing in the same manner as in the step 3);
5) the round piezoelectric sheet (12) and the rectangular piezoelectric sheet (14) adopt a flanging electrode mode to lead out a negative electrode or utilize the conductivity of the shell (11) as the negative electrode;
6) after the electric signal leading-out operation is finished, the bracket (13) is fixed on the shell to form a final transduction structure.
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| CN202111138975.7A CN113791461A (en) | 2021-09-27 | 2021-09-27 | Transduction structure of piezoelectric rainfall sensor and installation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120272726A1 (en) * | 2011-04-29 | 2012-11-01 | Cullen Robert M | Precipitation Sensor |
| CN104316243A (en) * | 2014-09-29 | 2015-01-28 | 西北农林科技大学 | Raindrop impact kinetic energy testing system based on multipoint PVDF piezoelectric thin-film sensor |
| CN111472921A (en) * | 2020-03-04 | 2020-07-31 | 温州大学 | Wave energy piezoelectric power generation buoy based on mass spring system |
| CN111473839A (en) * | 2020-04-22 | 2020-07-31 | 中电科技集团重庆声光电有限公司 | Ultrasonic transducer and nested structure thereof |
| CN213365073U (en) * | 2020-10-22 | 2021-06-04 | 深圳市农博创新科技有限公司 | Piezoelectric rainfall sensor and piezoelectric rainfall detection system |
-
2021
- 2021-09-27 CN CN202111138975.7A patent/CN113791461A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120272726A1 (en) * | 2011-04-29 | 2012-11-01 | Cullen Robert M | Precipitation Sensor |
| CN104316243A (en) * | 2014-09-29 | 2015-01-28 | 西北农林科技大学 | Raindrop impact kinetic energy testing system based on multipoint PVDF piezoelectric thin-film sensor |
| CN111472921A (en) * | 2020-03-04 | 2020-07-31 | 温州大学 | Wave energy piezoelectric power generation buoy based on mass spring system |
| CN111473839A (en) * | 2020-04-22 | 2020-07-31 | 中电科技集团重庆声光电有限公司 | Ultrasonic transducer and nested structure thereof |
| CN213365073U (en) * | 2020-10-22 | 2021-06-04 | 深圳市农博创新科技有限公司 | Piezoelectric rainfall sensor and piezoelectric rainfall detection system |
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| Title |
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| 刘清惓 等: "基于压电效应的FPGA降水粒子测量系统设计", 《传感器与微系统》, vol. 33, no. 3, pages 85 - 88 * |
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