CN1987373A - Vibration sensor based on magnetic suspension principle - Google Patents
Vibration sensor based on magnetic suspension principle Download PDFInfo
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- CN1987373A CN1987373A CN 200510111893 CN200510111893A CN1987373A CN 1987373 A CN1987373 A CN 1987373A CN 200510111893 CN200510111893 CN 200510111893 CN 200510111893 A CN200510111893 A CN 200510111893A CN 1987373 A CN1987373 A CN 1987373A
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Abstract
The vibration sensor is composed of magnet and winding. Characters are that when sensor induces external vibration, relative motion between magnetic suspended magnet and magnet fixed inside sensor occurs. Vibration of suspended magnet causes change of flux through coil. Based on Faraday law of electromagnetic induction, coil generates induction electromotive force being direct proportion to vibration velocity. Features are: simple and compact structure without need of metal reed and spring for fixing suspended magnet, wider induced vibration frequency spectrum. The disclosed vibration sensor is new type passive speed type vibration sensor.
Description
Invention field
The present invention relates to a kind of vibration transducer based on magnetic suspension principle.The present invention for example has specific use aspect petroleum prospecting and the seismic surveying aspect geologic prospecting and vibration safety monitoring, but still can be widely used in as mechanical vibration, sound wave and ultrasonic measurement aspect.
Background of invention
Vibration is a research topic that relates generally in engineering and the scientific research, as aspects such as seismic prospecting, mechanical vibration and sound wave, ultrasonic measurements.Vibration survey comprises displacement, frequency, position phase and physical quantitys such as vibration velocity and acceleration.Traditional vibration measurement method has senser elements such as mechanical type, inductance type, condenser type, voltage dependent resistor (VDR) formula, piezoelectric type at present.The limitation of these traditional sensors spares is that sensitivity is low, and anti-electromagnetic interference capability is relatively poor, and it is narrower to measure frequency band, to the environmental requirement harshness etc.And at present in a lot of fields, for example aspect oil seismic exploration, because detection and corresponding resolution to the geology infrastructure have very high requirement, press for high sensitivity and wide band vibration transducer, so the development of novel vibrating sensor just becomes the technical matters that many engineerings field presses for solution.
In sensor sale volume, being in primary at present is the pressure vibration sensor.Vibration transducer also is widely used in field of engineering technology such as noise, shock wave, blast, underwater sound detections.Oil seismic exploration is extensive use of vibration transducer.24 delta sigma technology are generally adopted in oil seismic exploration data acquisition and processing (DAP) at present, dynamic recording range can reach 120dB, at home and abroad the petroleum exploration industry is widely used simultaneously is traditional " movable coil velocity profile wave detector ", recordable maximum dynamic range only is 60dB, the distortion of received signal is big, response band is narrow, need several to tens receiver patteries to reduce noise jamming, strengthened the cost of oil-gas exploration like this.Along with the increasing of the exploration zone of interest degree of depth, the high-frequency signal decay in the petroleum seismic reflected signal of deep is fast, mainly shows as characteristics of low-frequency, and tradition " movable coil velocity profile wave detector " is poor to low frequency signal (particularly less than 6Hz signal) receiving ability.Simultaneously, the high frequency response ability of traditional detector is also poor, be unfavorable for the high resolving power exploration, so the wave detector technology becomes a bottleneck of high precision and deep seismic exploration technique.
High-resolution seismic survey requires the wave detector type to develop to many components from simple component; Develop to numeric type from analogue type; Develop to the high sensitivity great dynamic range from muting sensitivity, small dynamic range; Develop (being single wave detector received signal of single track) from the receiver pattern receive mode to the single-point receive mode; The wave detector construction method is developed to single small distance between receivers receive mode of single track by many strings of big track pitch and array mode.
" the movable coil velocity profile wave detector " that is used for petroleum exploration be coil stationary with activity at the spring coaxial with magnet, by the induction external vibration spring and coil are produced with respect to magnet and move and produce induction electromotive force by coil.Because the natural frequency of spring, therefore the frequency band of detection of " movable coil velocity profile wave detector " is very narrow, is not enough to survey the whole broadband elastic waves that produced by secondary reflection.And the velocity profile detector noise of this quasi-tradition disturbs greatlyyer, in order to suppress noise, must adopt several string and combinations to tens.
The mathematical model of conventional vibration sensor is all vibrated based on mass and is made the spring or the reed that bear the counterweight object produce vibration.And this elastic vibration is transformed into the physical quantity that can survey, as voltage etc.Therefore the natural frequency and the damping of spring or reed are two crucial physical quantitys.Because the coherence request of thousands of the velocity profile wave detectors that are used for petroleum exploration is very high, the stiffness coefficient of spring and processing technology are required also very high, therefore seek the key that the new technology of replacing the spring vibrations is development novel vibrating sensors.
Summary of the invention
Principle of the present invention is as follows:
A permanent magnet (magnet and NdFeB material etc.) is placed another piece magnet top, as shown in Figure 1, if the magnetic direction of two permanent magnets is opposite, and the interaction force μ H in two magnetic fields
2A/2 is greater than the gravity mg (μ: the magnetic permeability of magnet of top magnet; H: magnetic field intensity; A: the area of plane of two magnets that are parallel to each other; M: top magnet quality) promptly: μ H
2A/2＞mg, then the top magnet is suspended on another magnet.Be fixed in the below magnet on the tested vibrating mass and when responding to external vibration, then levitated magnet under gravity and magneticaction with respect to the fixed magnets reversal of vibrations.On vibration transducer, because the levitated magnet up-down vibration, the magnetic flux by coil changes with coil stationary, the foundation Faraday's electromagnetic induction law, and the coil two ends produce induction electromotive force, and induction electromotive force and vibration velocity are proportional.Therefore this magnetic suspension vibrating sensor is the velocity profile sensor.The length of coil as far as possible with the levitated magnet equal in length, and end face of levitated magnet placed the coil centre position.For the linearity and the raising sensitivity that improves sensor, can adopt difference form as shown in Figure 1.Permanent magnet is suspended between two magnets, and under static state two end faces up and down of magnetic levitation magnet is suspended in the centre position of two groups of identical coils.Under identical vibration condition, the induction electromotive force that two groups of coils in parallel produce is the twice of one group of coil, and the linearity of velocity pick-up greatly improves.
According to above-mentioned magnetic suspension principle, the support magnet of novel magnetically levitated sensor can be by permanent magnet (as magnet and neodymium-iron-boron magnetic material etc.), and electromagnet and alive coil are formed.The big I of the suspension magnetic that alive coil produces changes with the change of electric current.The magnetic levitation magnet can be by permanent magnet, and electromagnet and magnetic fluid constitute.
Three-component magnetic suspension vibrating sensor be achieved in that cube magnet or magnetizable solid such as ferrite or other cubical three directions three pairs of magnets are installed respectively, as shown in Figure 2.This magnet is suspended in the cubic space that is made of other three pairs of magnets; Each is opposite to the magnetic direction of the magnet magnetic direction corresponding with levitated magnet; And at two groups of coils of each direction coiling; Two groups of coils in parallel form the three-component magnetic suspension vibrating sensor of difference form.
Under equal magnetic field condition, the natural frequency of magnetic suspension vibrating sensor is exponential decay dependence with the distance between two magnets, and reduces with the increase of levitated magnet weight.Produce eddy current owing to the relative motion of levitated magnet and support magnet in magnet surface, but the vibration of this eddy current damping levitated magnet.Therefore being characterized as of this magnetic suspension vibrating sensor need not spring or spring leaf support, and has auto inhibition.This magnetic suspension vibrating sensor has simple in structure, and compactness is highly sensitive, stability and high conformity and the characteristics of being convenient to assemble.Because levitated magnet need not mechanical support, stand collision and impact to set back automatically afterwards, do not have the influence factor of mechanical fatigue, so this magnetic suspension vibrating sensor can be applicable to the more abominable field work of environment.
This magnetic levitation sensor has high sensitivity, wide band characteristics.The high-frequency information that this magnetic suspension vibrating sensor receives is abundanter than traditional detector, and this provides a kind of new technology for high-precision oil seismic exploration.
Description of drawings
Fig. 1 is an organigram of the present invention;
Fig. 2 is three-component magnetic suspension vibrating sensor arrangement synoptic diagram;
Fig. 3 is the width of cloth-frequency feature measurement figure as a result of one dimension magnetic suspension vibrating sensor;
Fig. 4 is the combination contrast and experiment figure of single magnetic levitation sensor and 24 traditional moving-coil geophones;
Fig. 5 is the spectrogram of the reflection wave signal of single magnetic suspension vibrating sensor reception;
Fig. 6 is the reflection wave signal spectrogram of 24 traditional moving-coil geophone combined reception.
Embodiment
Based on above-mentioned magnetic suspension principle, an one dimension magnetic suspension vibrating sensor surplus we have constructed 300, and the width of cloth-frequency characteristic of sensor measured, the result is as shown in Figure 3.The magnetic suspension vibrating sensor of constructing is used for petroleum exploration in the somewhere, Jiangsu, and the combination of 24 traditional moving-coil geophones of single magnetic levitation sensor and French import carried out single big gun contrast experiment, the result as shown in Figure 4, left side figure is the result of single magnetic suspension vibrating sensor, and right figure is the combined result of 24 traditional moving-coil geophones.As can be seen, this magnetic levitation sensor resolution of being used for petroleum exploration is higher than the combination of traditional moving-coil geophone.Fig. 5 is the spectrogram of the reflection wave signal of single magnetic suspension vibrating sensor reception.Fig. 6 is the reflection wave signal spectrogram of 24 traditional moving-coil geophone combined reception.As can be seen, the high-frequency information that this magnetic suspension vibrating sensor receives is abundanter than traditional detector, and this provides a kind of new technology for high-precision oil seismic exploration.
Claims (7)
1. based on the vibration transducer of magnetic suspension principle, be made up of magnet and coil, it is characterized by: the magnet that suspends when the sensor sensing external vibration is with respect to its support magnet generation telemechanical, and produced with the proportional induction electromotive force of vibration velocity by coil.
2. vibration transducer as claimed in claim 1, magnet are suspended on another fixed magnets opposite with its magnetic direction.
3. vibration transducer as claimed in claim 1, magnet are suspended between other two fixed magnets opposite with its magnetic direction.
4. vibration transducer as claimed in claim 1, magnet are suspended between two pairs of fixed magnets opposite with its magnetic direction.
5. vibration transducer as claimed in claim 1, magnet are suspended between three pairs of fixed magnets opposite with its magnetic direction.
6. as claim 1,2,3,4 or 5 described vibration transducers, magnet are by permanent magnet (as magnet and neodymium-iron-boron magnetic material etc.), electromagnet, and magnetic liquid, and alive coil is formed.
7. as claim 1,2,3,4 or 5 described vibration transducers when magnet is suspended in pair of magnets, in the time of between the two pairs of magnets and the three pairs of magnets, constitute one dimension respectively, and the two and three dimensions vibration transducer also is used to respond to one dimension, the two and three dimensions vibration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510111893 CN1987373A (en) | 2005-12-23 | 2005-12-23 | Vibration sensor based on magnetic suspension principle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510111893 CN1987373A (en) | 2005-12-23 | 2005-12-23 | Vibration sensor based on magnetic suspension principle |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101237176B (en) * | 2008-01-10 | 2010-06-09 | 上海交通大学 | Scalable swing magnetic suspending device |
| CN101858925A (en) * | 2010-03-26 | 2010-10-13 | 鸿富锦精密工业（深圳）有限公司 | Sensing device |
| CN102023309A (en) * | 2010-10-29 | 2011-04-20 | 谭成忠 | Maglev electromagnetic induction cymoscope |
| CN102901556A (en) * | 2012-10-09 | 2013-01-30 | 北京航空航天大学 | Magnetic suspension type ultra-low-frequency vibration sensor |
| CN104006916A (en) * | 2014-05-30 | 2014-08-27 | 北京交通大学 | Mutual inductance type magnetic liquid micro-differential-pressure sensor |
| CN104393736A (en) * | 2014-11-25 | 2015-03-04 | 北京交通大学 | Planar vibration energy collector adopting magnetic liquid and permanent magnet combined structure |
| CN104500640A (en) * | 2014-12-29 | 2015-04-08 | 北京交通大学 | Adaptive linear magnetic liquid damping vibration absorber |
| CN104565167A (en) * | 2014-12-29 | 2015-04-29 | 北京交通大学 | Adaptive variable-stiffness linear magnetic liquid damping vibration absorber |
| CN104990622A (en) * | 2015-07-31 | 2015-10-21 | 河北工业大学 | Multi-level vibration detector based on electromagnetic induction |
| CN106840367A (en) * | 2017-03-23 | 2017-06-13 | 北京航空航天大学 | A kind of floated low-frequency shock transducer of multiaxis |
| CN107313920A (en) * | 2016-04-27 | 2017-11-03 | 青岛海尔智能技术研发有限公司 | Linear compressor and method for detecting position |
| CN108303174A (en) * | 2018-02-05 | 2018-07-20 | 山东理工大学 | A kind of electromagnetic induction vibration signal extraction element based on field-effect tube |
| CN109375260A (en) * | 2018-12-05 | 2019-02-22 | 西安振兴泽博智能震感科技有限公司 | The single anti-drop sensor of low frequency high sensitivity moving-coil type |
| CN109883319A (en) * | 2019-01-31 | 2019-06-14 | 江西理工大学 | A kind of detection method and system of permanent magnet suspension lateral deviation |
| CN110247536A (en) * | 2019-04-29 | 2019-09-17 | 中北大学 | A kind of anti-rolling hexahedron magnetic suspending power generation device |
| CN111412831A (en) * | 2020-03-27 | 2020-07-14 | 北京交通大学 | Impact-resistant magnetic liquid touch sensor |
| CN116320948A (en) * | 2023-05-25 | 2023-06-23 | 深圳市遨捷智能科技有限公司 | Magnetic suspension bone conduction speaker and bone conduction hearing aid |
-
2005
- 2005-12-23 CN CN 200510111893 patent/CN1987373A/en active Pending
Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101237176B (en) * | 2008-01-10 | 2010-06-09 | 上海交通大学 | Scalable swing magnetic suspending device |
| CN101858925A (en) * | 2010-03-26 | 2010-10-13 | 鸿富锦精密工业（深圳）有限公司 | Sensing device |
| CN102023309A (en) * | 2010-10-29 | 2011-04-20 | 谭成忠 | Maglev electromagnetic induction cymoscope |
| CN102023309B (en) * | 2010-10-29 | 2013-03-27 | 谭成忠 | Maglev electromagnetic induction cymoscope |
| CN102901556A (en) * | 2012-10-09 | 2013-01-30 | 北京航空航天大学 | Magnetic suspension type ultra-low-frequency vibration sensor |
| CN102901556B (en) * | 2012-10-09 | 2014-04-16 | 北京航空航天大学 | Magnetic suspension type ultra-low-frequency vibration sensor |
| CN104006916A (en) * | 2014-05-30 | 2014-08-27 | 北京交通大学 | Mutual inductance type magnetic liquid micro-differential-pressure sensor |
| CN104006916B (en) * | 2014-05-30 | 2017-10-31 | 北京交通大学 | A kind of mutual inductance type magnetic-liquid micro differential pressure sensor |
| CN104393736A (en) * | 2014-11-25 | 2015-03-04 | 北京交通大学 | Planar vibration energy collector adopting magnetic liquid and permanent magnet combined structure |
| CN104500640A (en) * | 2014-12-29 | 2015-04-08 | 北京交通大学 | Adaptive linear magnetic liquid damping vibration absorber |
| CN104565167A (en) * | 2014-12-29 | 2015-04-29 | 北京交通大学 | Adaptive variable-stiffness linear magnetic liquid damping vibration absorber |
| CN104500640B (en) * | 2014-12-29 | 2016-08-24 | 北京交通大学 | A kind of self adaptation straight line magnetic fluid damper |
| CN104990622A (en) * | 2015-07-31 | 2015-10-21 | 河北工业大学 | Multi-level vibration detector based on electromagnetic induction |
| CN104990622B (en) * | 2015-07-31 | 2017-09-26 | 河北工业大学 | Multistage vibration detector based on electromagnetic induction |
| CN107313920A (en) * | 2016-04-27 | 2017-11-03 | 青岛海尔智能技术研发有限公司 | Linear compressor and method for detecting position |
| CN106840367A (en) * | 2017-03-23 | 2017-06-13 | 北京航空航天大学 | A kind of floated low-frequency shock transducer of multiaxis |
| CN108303174A (en) * | 2018-02-05 | 2018-07-20 | 山东理工大学 | A kind of electromagnetic induction vibration signal extraction element based on field-effect tube |
| CN109375260A (en) * | 2018-12-05 | 2019-02-22 | 西安振兴泽博智能震感科技有限公司 | The single anti-drop sensor of low frequency high sensitivity moving-coil type |
| CN109375260B (en) * | 2018-12-05 | 2023-12-05 | 西安振兴泽博智能震感科技有限公司 | Single low-frequency high-sensitivity moving coil type anti-falling sensor |
| CN109883319A (en) * | 2019-01-31 | 2019-06-14 | 江西理工大学 | A kind of detection method and system of permanent magnet suspension lateral deviation |
| WO2020155974A1 (en) * | 2019-01-31 | 2020-08-06 | 赣州德业电子科技有限公司 | System and method for detecting lateral deviation of permanent magnet suspension |
| CN109883319B (en) * | 2019-01-31 | 2020-11-24 | 江西理工大学 | Permanent magnet suspension lateral deviation detection method and system |
| CN110247536A (en) * | 2019-04-29 | 2019-09-17 | 中北大学 | A kind of anti-rolling hexahedron magnetic suspending power generation device |
| CN111412831A (en) * | 2020-03-27 | 2020-07-14 | 北京交通大学 | Impact-resistant magnetic liquid touch sensor |
| CN116320948A (en) * | 2023-05-25 | 2023-06-23 | 深圳市遨捷智能科技有限公司 | Magnetic suspension bone conduction speaker and bone conduction hearing aid |
| CN116320948B (en) * | 2023-05-25 | 2023-08-18 | 深圳市遨捷智能科技有限公司 | Magnetic suspension bone conduction speaker and bone conduction hearing aid |
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