CN105841801A - Water surface wave sensor measurement device - Google Patents
Water surface wave sensor measurement device Download PDFInfo
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- CN105841801A CN105841801A CN201610267427.7A CN201610267427A CN105841801A CN 105841801 A CN105841801 A CN 105841801A CN 201610267427 A CN201610267427 A CN 201610267427A CN 105841801 A CN105841801 A CN 105841801A
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- electrode
- water surface
- pvdf piezoelectric
- wave sensor
- surface wave
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 238000005259 measurement Methods 0.000 title claims abstract description 36
- 239000002033 PVDF binder Substances 0.000 claims abstract description 79
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 79
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000009413 insulation Methods 0.000 claims abstract description 15
- 239000004744 fabric Substances 0.000 claims description 56
- 229920005594 polymer fiber Polymers 0.000 claims description 14
- 239000010409 thin film Substances 0.000 claims description 12
- 238000007667 floating Methods 0.000 claims description 9
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 239000011733 molybdenum Substances 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052721 tungsten Inorganic materials 0.000 claims description 4
- 239000010937 tungsten Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 239000006229 carbon black Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 15
- 239000000835 fiber Substances 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 5
- 238000011161 development Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 5
- 230000000007 visual effect Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008092 positive effect Effects 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 238000006424 Flood reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 241000630329 Scomberesox saurus saurus Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000009429 distress Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
- G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices
Abstract
The present invention discloses a water surface wave sensor measurement device. The pedestal of the water surface wave sensor measurement device is provided with four PVDF piezoelectric fibers with cantilever beam structure which are uniformly and symmetrically distributed on the pedestal. The surfaces of the PVDF piezoelectric fibers are uniformly coated with a pair of symmetrical electrodes, wherein a first electrode is taken as an positive electrode, and a second electrode is taken as a negative electrode. The surfaces of the first electrode and the second electrode are coated with one layer of waterproof insulation film to avoid the peeling of the PVDF piezoelectric fibers caused by human factors or non-human factor in the usage process of the PVDF piezoelectric fibers or the short circuit condition of the PVDF piezoelectric fibers and surrounding medium in the usage process of the first electrode and the second electrode. The prepared PVDF piezoelectric fibers are uniformly and symmetrically distributed on the pedestal. The four PVDF piezoelectric fibers are fixed installed on the pedestal of the water surface wave sensor and float on the water to measure the concrete position of the target object on the water. The water surface wave sensor measurement device is wide in signal detection range, complete in target information acquisition, high in target information acquisition precision and fast in target information acquisition speed.
Description
Technical field
The present invention relates to a kind of water surface wave sensor measurement apparatus.
Background technology
Now, one of floods always natural disaster affecting maximum in the world, floods not only compromise the safety of the people, and cause huge economic loss to country, individual, socio-economic development creates the adverse consequences that cannot estimate.To this end, timely aquatic environment and waterborne target can be detected by water surface movable robot and position, the person in distress in search rescue water and floating property thereof, reduce the loss that disaster is brought.Additionally, research waterborne target detection and the mode positioned, method have also served as the theoretical basis of water surface movable robot navigation, search and rescue.
In recent years, along with mobile robot is more and more intelligent, use the environment around various sensor senses, as mobile robot uses sonar sensor to carry out target detection and avoidance etc., use laser sensor to carry out distance detection etc., but these sensors can not judge the situation of surrounding widely；Although the environment judged around its target and target that visual system can be more wide, Computer Image Processing ability and technology have had certain development and the substantial amounts of digital image processing apparatus ratio of performance to price to increase, but due to environment and the complexity of object and uncertainty, and the impact that the quality external environment condition of sensor itself is on performance, use a single sensor to provide information to have limitation and uncertainty.Therefore, in order to reach certain real-time, we need to utilize the visual system mode with range-measurement system writing to detect target.The open source literature data that waterborne target is carried out in terms of detection study by the mode that domestic and international application vision and millimetre-wave radar combine is less, and the technology using single-sensor or other sensors to blend such as waterborne target detection, avoidance, navigation more, accuracy is relative with accuracy the highest, it is therefore necessary to the mode that foundation vision cooperates mutually with millimetre-wave radar more effectively realizes the perception to ambient condition information, and then detect and the target on the water surface of location.But so make measurement system have complication, be affected the shortcomings such as relatively big, survey error is the biggest by extraneous factor.
At present, on market, the sensor of existing multiple detection waterborne target object, mainly has sonar sensor, laser sensor and visual system sensor.But these three sensor has the biggest defect, sonar sensor and laser sensor can not judge the situation of surrounding widely；Visual system sensor construction is complicated, by extraneous factor affected compared with big, speed is slow and precision is low.
Summary of the invention
The purpose of the present invention is aiming at the problems referred to above, it is provided that a kind of can realize detecting waterborne target, target is searched and rescued, aquatic environment monitoring, ensure marine operation safety, in collision prevention, play positive effect and water surface wave sensor measurement apparatus that relatively reliable data can be provided.
It is an object of the invention to be achieved through the following technical solutions, a kind of water surface wave sensor measurement apparatus, it is characterised in that: include that floating ball, four PVDF piezoelectric fabrics, pedestals, described four PVDF piezoelectric fabrics are uniformly and symmetrically distributed and are arranged on pedestal；Described PVDF piezoelectric fabric surface is coated with a pair equally distributed symmetry electrode, and one of them electrode is the first electrode, and another is the second electrode；Described floating ball is installed on uncoated first electrode of PVDF piezoelectric fabric free end, the part of the second electrode.
Angle between described every two PVDF piezoelectric fabrics is 90 °, and the angle of each PVDF piezoelectric fabric and pedestal intermediate symmetry axle is 45 °, is 30 ° with the angle of pedestal.
The centrage of described first electrode and the centerlines of the second electrode are 180 °, and the cornerite of the first electrode and the second electrode is 120 °, and in the first electrode and the second electrode, an electrode is as positive pole, and another electrode is as negative pole.
Described PVDF piezoelectric fabric shape of cross section is circular.
Described PVDF piezoelectric fabric is a kind of PVDF piezoceramic-polymer fiber, and PVDF piezoelectric fabric is made up of the first electrode, the second electrode, PVDF piezopolymer, metal-cored and waterproof insulation thin film；Described PVDF piezopolymer is uniformly wrapped up in and is invested on metal-cored, and the first electrode, the second electrode are uniformly and symmetrically distributed to be coated on PVDF piezopolymer, and waterproof insulation thin film is wrapped on the first electrode, the second electrode.
Described metal-cored for molybdenum filament or tungsten filament.
Described metal-cored a diameter of 0.08mm, 0.09mm or 0.10mm；
Described first electrode, the second electrode include metal level or conducting resinl or conductive silver paste or white carbon black, and surface electrode is full electrode.
One layer of waterproof insulation thin film is wrapped up on described first electrode, the second electrode.
Present configuration rationally simple, manufacture easy, easy to use, pass through the present invention, the present invention relates to a kind of water surface wave sensor measurement apparatus, use PVDF piezoelectric fabric, specifically a kind of PVDF piezoceramic-polymer fiber, the pedestal of water surface wave sensor is provided with the PVDF piezoelectric fabric of four cantilever beam structures, and is evenly and symmetrically distributed on pedestal.Use this PVDF piezoelectric fabric, a pair symmetry electrode of surface even spread, first electrode can be used as positive pole, second electrode uses as negative pole, and on the first electrode and the second electrode surface, wrap up one layer of waterproof insulation thin film, avoid PVDF piezoelectric fabric in use, peel off due to anthropic factor or the impact of non-artificial factor, or the first electrode and the second electrode are in use short-circuited with surrounding medium situation.
The PVDF piezoelectric fabric prepared is evenly and symmetrically distributed on pedestal.The water surface wave sensor measurement apparatus prepared being thrown on the water surface, a kind of seriality produced the piezopolymer device of PVDF piezoelectric fabric when water surface ripple loads or impact load so that piezopolymer device one voltage signal of output.Eventually through the orientation that the analyzing and processing of data is drawn water surface wave-wave source.
According to sonar sensor measurement apparatus, laser sensor measurement apparatus and the shortcoming of visual system, a kind of water surface wave sensor measurement apparatus of invention, improve the deficiency of above-mentioned three kinds of measurement apparatus greatly.It is thereby achieved that the accurate measurement to waterborne target object space.Water surface wave sensor measurement apparatus has acquisition of signal wide ranges, target information obtains the features such as complete, precision is high, fast, the simple in construction of speed, therefore, the development prospect that the application in mobile robot target detection of the water surface wave sensor measurement apparatus is increasingly subject to people's attention and shows, positive effect is played, it is provided that relatively reliable data in detection waterborne target, target search and rescue, aquatic environment monitoring, marine operation safety and collision prevention.This kind of sensor configuration mode also will become development trend important in following water surface movable robot navigation's mode.
By technique scheme, a kind of water surface wave sensor measurement apparatus of the present invention can realize detecting waterborne target, plays positive effect, it is provided that relatively reliable data in target search and rescue, aquatic environment monitoring, marine operation safety and collision prevention.
Along with mobile robot is more and more intelligent, use the environment around various sensor senses, popularizing of target detection, avoidance and aquatic environment detection etc., need the non-electrical quantity that substantial amounts of sensor will be measured and control, being converted into can be with the signal of computer compatibility, the input signal as theirs, this fast development just feeding water wave sensor provides chance, forms the development of appreciable water surface wave sensor industry.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention a kind of water surface wave sensor measurement apparatus.
Fig. 2 is the structural representation of the PVDF piezoelectric fabric of the present invention.
In figure: 1 floating ball, 2 PVDF piezoelectric fabrics, 201 waterproof insulation thin film, 202 first electrodes, 203 metal-cored, 204 second electrodes, 205 PVDF piezopolymers, 3 pedestals.
Detailed description of the invention
Below in conjunction with the accompanying drawings and accompanying drawing explanation the present invention is described further.
This water surface wave sensor measurement apparatus is made up of the PVDF piezoelectric fabric 2 of a pedestal 3 and four cantilever beam structures, PVDF piezoelectric fabric 2 is a kind of PVDF piezoceramic-polymer fiber, the PVDF piezoelectric fabric 2 of four cantilever beam structures is evenly and symmetrically distributed on pedestal 3, angle between every two PVDF piezoelectric fabrics 2 is 90 °, the angle of each PVDF piezoelectric fabric 2 and pedestal 3 intermediate symmetry axle is 45 °, is 30 ° with the angle of pedestal 3.Every PVDF piezoelectric fabric 2 surface is all coated with a pair symmetry electrode, symmetry electrode is first electrode the 202, second electrode 204, it is insulation between electrode and the cantilever beam of PVDF piezoelectric fabric surface coating, and electrode (first electrode the 202, second electrode 204) surface is coated with one layer of waterproof insulation thin film 201, two center lines of electrodes angles are 180 °, and the cornerite of each electrode is 120 °, an electrode is as positive pole, and another electrode uses as negative pole；First electrode 202 and the second electrode 204 surface wrap up one layer of waterproof insulation thin film, avoid PVDF piezoelectric fabric 2 in use, peel off due to anthropic factor or the impact of non-artificial factor, or the first electrode 202 and the second electrode 204 are in use short-circuited with surrounding medium situation.PVDF piezoelectric fabric 2 free end at cantilever beam structure installs the floating ball 1 of a ultra-hydrophobicity so that water surface wave sensor measurement apparatus can swim on the water surface, and the four PVDF piezoelectric fabrics 2 prepared are arranged on the pedestal 3 of water surface wave sensor.Water surface wave sensor measurement apparatus is positioned on the water surface, loads or impact load when water surface ripple produces a kind of seriality to PVDF piezoelectric fabric 2 so that PVDF piezopolymer device one voltage signal of output.Owing to water surface ripple is in wave process, the time arriving four PVDF piezoelectric fabrics 2 is different, make when PVDF piezoelectric fabric 2 is by impulsive force, there is a time difference in the voltage signal of output, eventually through the orientation that the analyzing and processing of data is drawn water surface wave-wave source, thus realize the detection to waterborne target, target search and rescue, aquatic environment monitoring etc..
Selectively, this device is a kind of similar water skipper structure, the PVDF piezoelectric fabric 2 of four cantilever beam structures is arranged on pedestal 3, every PVDF piezoelectric fabric 2 is all cantilever beam structure, one end is fixed on pedestal 3, and PVDF piezoceramic-polymer fiber surface is coated with a pair equally distributed symmetry electrode, and one of them electrode is the first electrode 202, another electrode is the second electrode 204, is insulation between electrode and the cantilever beam of piezoceramic-polymer fiber surface coating.
Selectively, four cantilever beam structure PVDF piezoelectric fabrics 2 of this device are evenly and symmetrically distributed on pedestal 3, angle between every two PVDF piezoelectric fabrics 2 is 90 °, and the angle of each PVDF piezoelectric fabric 2 and pedestal 3 intermediate symmetry axle is 45 °, is 30 ° with the angle of pedestal 3.
Selectively, there is one group of symmetry electrode on this piezoceramic-polymer fiber surface, and two center lines of electrodes angles are 180 °, and the cornerite of each electrode is 120 °, and an electrode is as positive pole, and another electrode uses as negative pole.
Selectively, PVDF piezoelectric fabric 2 shape of cross section of this cantilever beam structure is circular.
Selectively, the PVDF fiber 2 of this cantilever beam structure is a kind of piezoceramic-polymer fiber.
Selectively, this piezoceramic-polymer fiber is molybdenum filament or tungsten filament by intermediate core, is uniformly wrapped up in the piezopolymer being attached on molybdenum filament or tungsten filament and be coated on the electrode on piezopolymer surface and form.
Selectively, the metallic core diameter in the middle of this piezoceramic-polymer fiber can be 0.08mm, 0.09mm or 0.10mm.
Selectively, the electrode of this piezoceramic-polymer fiber surface coating includes metal level, or conducting resinl, or conductive silver paste, or white carbon black, and surface electrode is full electrode.
Selectively, the electrode on this piezoceramic-polymer fiber surface, in order to not contact with water, is provided with waterproof insulation thin film on coated surface electrode.
Selectively, this piezoceramic-polymer fiber, in the part of the uncoated electrode of free end, installs the floating ball 1 with ultra-hydrophobicity.
A kind of water surface wave sensor measurement apparatus of invention is as it is shown in figure 1, be made up of floating ball 1, PVDF piezoelectric fabric 2 and pedestal 3.
Fig. 2 is the structural representation of PVDF piezoelectric fabric, and PVDF piezoelectric fabric 2 is a kind of PVDF piezoceramic-polymer fiber, is made up of first electrode the 202, second electrode 204, PVDF piezopolymer 205, metal-cored 203 and waterproof insulation thin film 201.The PVDF piezoelectric fabric 2 prepared is arranged on the pedestal 3 of water surface wave sensor, is finally placed on the water surface detection waterborne target, target search and rescue, aquatic environment monitoring etc..Water surface ripple can be produced when object flows on the water surface.When water surface wave-wave moves water surface wave sensor measurement apparatus, PVDF piezoelectric fabric 2 can be produced impulsive force, PVDF piezoelectric fabric 2 is after receiving impulsive force, one end of stress can occur bending and deformation to the one end not stressed, impulsive force is the biggest, and deflection is the biggest, otherwise the least.PVDF piezoelectric fabric 2 is deforming when, and the electrode of PVDF piezoelectric fabric 2 can export a magnitude of voltage, and deflection is the biggest, and the piezoelectric voltage value of output is the biggest.Water surface wave sensor is according in the same time, water surface ripple is different to the impulsive force power of four PVDF piezoelectric fabrics 2, the deflection of PVDF piezoelectric fabric 2 is the most different, the voltage signal power of output is also the most different, and judge the wave source of water surface ripple according to this character, thus detect the particular location of waterborne target.
Water surface wave sensor measurement apparatus needed to be linked to two electrodes (first electrode the 202, second electrode 204) on every PVDF piezoelectric fabric 2 with metal lead wire the input of charge amplifier before detection waterborne target, outfan and the data collecting card of charge amplifier are connected, then data collecting card is connected on computer.It is analyzed by the data obtained by water surface wave sensor detection waterborne target, the particular location of waterborne target can be drawn.
Claims (9)
1. a water surface wave sensor measurement apparatus, it is characterised in that: including floating ball (1), four PVDF piezoelectric fabrics (2), pedestals (3), described four PVDF piezoelectric fabrics (2) are uniformly and symmetrically distributed and are arranged on pedestal (3)；Described PVDF piezoelectric fabric (2) surface is coated with a pair equally distributed symmetry electrode, and one of them electrode is the first electrode (202), and another is the second electrode (204)；Described floating ball (1) is installed on uncoated first electrode of PVDF piezoelectric fabric (2) free end (202), the part of the second electrode (204).
A kind of water surface wave sensor measurement apparatus the most according to claim 1, it is characterized in that: the angle between described every two PVDF piezoelectric fabrics (2) is 90 °, the angle of each PVDF piezoelectric fabric (2) and pedestal (3) intermediate symmetry axle is 45 °, is 30 ° with the angle of pedestal (3).
A kind of water surface wave sensor measurement apparatus the most according to claim 1, it is characterized in that: the centrage of described first electrode (202) and the centerlines of the second electrode (204) are 180 °, the cornerite of the first electrode (202) and the second electrode (204) is 120 °, in first electrode (202) and the second electrode (204), an electrode is as positive pole, and another electrode is as negative pole.
A kind of water surface wave sensor measurement apparatus the most according to claim 1, it is characterised in that: described PVDF piezoelectric fabric (2) shape of cross section is circular.
A kind of water surface wave sensor measurement apparatus the most according to claim 1, it is characterized in that: described PVDF piezoelectric fabric (2) is a kind of PVDF piezoceramic-polymer fiber, and PVDF piezoelectric fabric (2) is made up of the first electrode (202), the second electrode (204), PVDF piezopolymer (205), metal-cored (203) and waterproof insulation thin film (201)；Described PVDF piezopolymer (205) uniformly wraps up in and invests on metal-cored (203), first electrode (202), the second electrode (204) are uniformly and symmetrically distributed to be coated on PVDF piezopolymer (205), and waterproof insulation thin film (201) is wrapped on the first electrode (202), the second electrode (204).
A kind of water surface wave sensor measurement apparatus the most according to claim 5, it is characterised in that: described metal-cored (203) are molybdenum filament or tungsten filament.
A kind of water surface wave sensor measurement apparatus the most according to claim 5, it is characterised in that: a diameter of 0.08mm, 0.09mm or the 0.10mm of described metal-cored (203).
A kind of water surface wave sensor measurement apparatus the most according to claim 1, it is characterised in that: described first electrode (202), the second electrode (204) include metal level or conducting resinl or conductive silver paste or white carbon black, and surface electrode is full electrode.
A kind of water surface wave sensor measurement apparatus the most according to claim 1, it is characterised in that: described first electrode (202), the second electrode (204) one layer of waterproof insulation thin film (201) of upper parcel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610267427.7A CN105841801B (en) | 2016-04-27 | 2016-04-27 | A kind of water surface wave sensor measuring device |
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| CN201610267427.7A CN105841801B (en) | 2016-04-27 | 2016-04-27 | A kind of water surface wave sensor measuring device |
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| CN105841801A true CN105841801A (en) | 2016-08-10 |
| CN105841801B CN105841801B (en) | 2019-04-09 |
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|---|---|---|---|---|
| CN1646887A (en) * | 2002-04-08 | 2005-07-27 | 韦伯罗特龙股份有限公司 | Piezoelectric vibration sensor |
| CN101304069A (en) * | 2008-06-13 | 2008-11-12 | 南京航空航天大学 | Piezoelectric ceramic fibre containing metal core painted by electrode partly |
| US20090021117A1 (en) * | 2004-09-10 | 2009-01-22 | Matsushita Electric Industrial Co., Ltd. | Vibration detecting sensor and pressure sensitive switch using cable-shaped piezoelectric element |
| CN102013837A (en) * | 2010-12-23 | 2011-04-13 | 南京航空航天大学 | Dandelion-like multi-directional broadband piezoelectric vibration energy collection device |
| JP2011137637A (en) * | 2009-12-25 | 2011-07-14 | Nec Tokin Corp | Surface acoustic wave resonator type vibration sensor |
| CN201903398U (en) * | 2010-08-30 | 2011-07-20 | 江苏省电力公司宜兴市供电公司 | Vibrating sensor based on directionality |
-
2016
- 2016-04-27 CN CN201610267427.7A patent/CN105841801B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1646887A (en) * | 2002-04-08 | 2005-07-27 | 韦伯罗特龙股份有限公司 | Piezoelectric vibration sensor |
| US20090021117A1 (en) * | 2004-09-10 | 2009-01-22 | Matsushita Electric Industrial Co., Ltd. | Vibration detecting sensor and pressure sensitive switch using cable-shaped piezoelectric element |
| CN101304069A (en) * | 2008-06-13 | 2008-11-12 | 南京航空航天大学 | Piezoelectric ceramic fibre containing metal core painted by electrode partly |
| JP2011137637A (en) * | 2009-12-25 | 2011-07-14 | Nec Tokin Corp | Surface acoustic wave resonator type vibration sensor |
| CN201903398U (en) * | 2010-08-30 | 2011-07-20 | 江苏省电力公司宜兴市供电公司 | Vibrating sensor based on directionality |
| CN102013837A (en) * | 2010-12-23 | 2011-04-13 | 南京航空航天大学 | Dandelion-like multi-directional broadband piezoelectric vibration energy collection device |
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