CN101930078A - Anti-electromagnetic interference sensor - Google Patents
Anti-electromagnetic interference sensor Download PDFInfo
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- CN101930078A CN101930078A CN2009100867491A CN200910086749A CN101930078A CN 101930078 A CN101930078 A CN 101930078A CN 2009100867491 A CN2009100867491 A CN 2009100867491A CN 200910086749 A CN200910086749 A CN 200910086749A CN 101930078 A CN101930078 A CN 101930078A
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Abstract
The invention relates to an anti-electromagnetic interference sensor. The sensor has a cylindrical structure; in the structure, main magnetic steel is arranged in the middle, a coil rack is sleeved outside and is wound with a copper coil which is fixed by the extrusion of a spring and can move up and down relative to the main magnetic steel; the two ends of the main magnetic steel are fixed on an upper magnetic steel frame and a lower magnetic steel frame; the external ends of the upper and lower magnetic steel frames are fixed with upper secondary magnetic steel and lower secondary magnetic steel respectively; the polarities of the upper and lower secondary magnetic steels correspond to those of the two ends of the main magnetic steel, namely, N and S poles of the upper and lower secondary magnetic steels correspond to those of the two ends of the main magnetic steel respectively; an upper top cover, a lower bottom cover, the two secondary magnetic steel, the two magnetic steel frames, the main magnetic steel and a shell wall are fixed together rigidly; a magnetic steel fixing frame, the upper top cover, the bottom cover and the shell wall are soft iron or aluminium alloys having good magnetic conductivities; and a lead wire of the coil is connected with a hair spring and led out from a magnetic steel fixing frame close to the external wall, the upper secondary magnetic steel and the upper top cover. The sensor has a capability of preventing external electromagnet interference, a distortion index of up to 0.025 to 0.05 percent and a dynamic range which is 6 to 12dB higher than that of a super detector.
Description
Technical field
The present invention relates to a kind of sensor of anti-electromagnetic interference (EMI), this sensor produces correspondent voltage signal (be mainly used in the seismic prospecting in the seismoreceiver) with extraneous vibration (speed or acceleration).
Background technology
The shielding of electromagnetic field can be divided into electrostatic screening, magnetic shielding and three kinds of situations of electromagnetic screen, and these three kinds of differences that situation had both had matter have inherent contact again:
Electrostatic screening
No matter whether sealing conductor shell ground connection, internal electric field is not subjected to shell exterior charging and electric field influence, and ground connection sealing conductor shell external electric field is not subjected to the influence of electric charge in the shell, and this phenomenon is electrostatic screening; The electrostatic screening practical significance: shielding makes instrument or the working environment in the metallic conductor shell not influenced by external electrical field, also external electrical field is not exerted an influence.In fact, the electrostatic screening of being realized by a sealing conductor cavity is very effective.
Magnetic shielding
Static magnetic field is the magnetic field that steady current or permanent magnet produce, magnetic shielding is to utilize the ferromagnetic material of high magnetic permeability to make radome with the shielding external magnetic field, it is similar with the electrostatic screening effect and have differently, and the principle of magnetic shielding can illustrate with the notion of magnetic circuit.When ferromagnetic material and air were analyzed as parallel circuits, exhausted most magnetic field concentration was in ferromagnetic circuit.Because the magnetic permeability of ferromagnetic material is than big several thousand times of the magnetic permeability of air, so the magnetic resistance of the magneto resistive ratio ferromagnetic material of cavity is much bigger, the exhausted major part of the lines of magnetic induction of external magnetic field will be passed through in the ferromagnetic material wall, and the magnetic flux that enters sky vapour is few, like this, the cavity that is shielded by ferromagnetic material does not just have external magnetic field basically, thereby reach the purpose of magnetic shielding, the magnetic permeability of material is higher, barrel is thicker, shield effectiveness is just significantly. because of high ferromagnetic material such as the soft iron of magnetic permeability commonly used, silicon steel, permalloy is done screen layer, so magnetic shielding is named ferro-magnetic shield again.
The front points out that the effect of electrostatic screening is extraordinary, this be because the conductivity of metallic conductor than big tens orders of magnitude of conductivity of air, and the difference of the magnetic permeability of ferromagnetic material and air has only several magnitude, approximately greatly several thousand times usually.So total some leakage field of magnetic shielding.In order to reach better shield effectiveness, can adopt multilayer screen, leakage is masked one after another advance the residual magnetic flux amount in the sky vapour, so heaviness is generally all compared in respond well magnetic shielding, but, if make absolute " magnetostatic vacuum ", then can utilize the Meissner effect of superconductor, be about to a superconductor and be placed in the external magnetic field, magnetic induction density in its body is zero forever, superconductor is complete diamagnet, has optimal magnetic shielding effect, but at present can't widespread usage.
Electromagnetic screen
When electromagnetic field was propagated in conducting medium, the amplitude of its amount was pressed the index law decay with the increase of distance, and from viewpoint of energy, electromagnetic wave has energy loss when propagating in conducting medium, therefore, showed as reducing of an amount amplitude.The field amount of conductive surface is maximum, more gos deep into conductor inside, and an amount is littler, and this phenomenon is also referred to as skin effect, utilizes skin effect can stop frequency electromagnetic waves to penetrate good conductor and make electromagnetic screen.It has more universal significance than static, magnetic shielding.Electromagnetic screen is to suppress to disturb, and strengthens the reliability of equipment and the effective means of improving the quality of products.Reasonably use electromagnetic screen, can suppress the interference of external frequency electromagnetic waves, also can avoid removing to influence other equipment as interference source.
At present in existing more than the 50 year history of the widely used magnetic induction sensor of field of seismic exploration (seismoreceiver), along with progress of science and technology, present moving-coil geophone improves than early stage moving-coil geophone performance is existing, such as volume, durability, sensitivity etc., develop into present what is called " super wave detector ", but just do not have essence to change on structure and the principle.
Summary of the invention
The purpose of this invention is to provide on a kind of basis of the magnetic induction type sensor (seismoreceiver) in conventional principle, adopt the sensor of the anti-electromagnetic interference (EMI) of new construction design, make it have following characteristics: at first to be to have stronger anti-electromagnetic interference capability, the anti-electromagnetic interference structure of this uniqueness that novel anti-nafbetuc test adopts designs, and has the ability of anti-outside electromagnetic interference from principle; Next is a low distortion, and the distortion index may reach in the 0.025%--0.05 scope, makes its dynamic range improve 12-18dB on the basis of conventional wave detector, improves 6-12dB than super wave detector.
The sensor construction of anti-electromagnetic interference (EMI) of the present invention is a cylindrical structure, middle magnet steel is main magnet steel, the plastic coil frame that main magnet steel overcoat one is not influenced by magnetic force, twine copper inductive coil on the coil former, the coil former two ends are fixing by the spring extruding, but can do relative moving up and down with main magnet steel with the vibration in the external world; Main magnet steel two ends are fixed on up and down on two magnet steel framves, the magnet steel frame is fixed on the outer casing inner wall, two blocks of secondary magnet steel about two magnet steel frame outer ends are fixed respectively up and down, the diameter of two blocks of secondary magnet steel is greater than the diameter of hub of a spool master magnet steel up and down, diameter near shell, the polarity of two blocks of secondary magnet steel is staggered relatively with the polarity at main magnet steel two ends respectively up and down, N is extremely to the N utmost point, S is extremely to the S utmost point, upper top cover, lower bottom cover, two blocks of secondary magnet steel, two magnet steel framves, main magnet steel rigidly fixes with shell wall is in the same place the magnet steel fixed mount, upper top cover, lower bottom cover, with shell wall be good soft iron of magnetic conduction or aluminium alloy; The lead-in wire of coil connects with hairspring, and lead-in wire is from drawing near the magnet steel fixed mount of outer wall, last secondary magnet steel, upper top cover.
The working sensor principle of this structure is the same with common sensor, when sensor during along with extraneous up-down vibration, being subjected to up and down, two certain fixing coils of extruding of spring will keep original intrinsic stationary state and form relative moving up and down with main magnet steel, coil cuts the magnetic line of force of main magnet steel and produces induction electromotive force, also just finished the process that will the process of moving up and down have become the corresponding voltage signal.The sensor of this structure has very strong anti-electromagnetic radiation interference function, also gets the flux loop of analyte sensors structure.
General sensor does not have two blocks of secondary magnet steel up and down, the magnetic line of force overwhelming majority of main magnet steel is by magnetic force coil holder and outer wall form the loop up and down, top cover and sensor outer wall play the effect of shielding external electromagnetic radiation up and down, the reason that causes geophone distortion has a lot (as temperature, machining accuracy, pass coil magnetic line of force variation etc.), the variation of wherein passing the magnetic line of force of coil is one of major reason, also is the factor that we are most interested in.Reason is that the variation of passing the magnetic line of force of coil is from what to come.The magnetoconductivity of metal is much higher than the magnetoconductivity of air, has determined from the magnetic line of force overwhelming majority of the N utmost point through magnetic boots-metal shell-another magnetic boots-get back to S utmost point.Also have a small part to be dispersed in the air, these the two poles of the earth from sensor (wave detector) also have magnetic force directly to feel.But the magnetic line of force that it can not influence in the middle of the coil changes, and be not subjected under the external influence, and the magnetic line of force in the middle of the coil is should fixing of permanent-magnet steel generation.Yet we we can say that the electromagnetic wave in the large natural environment is ubiquitous.The variation of the magnetic line of force in the middle of the coil is from the environmental interference beyond the sensor.From the N level,, be subjected to the repulsion of the magnetic line of force that sends from the N utmost point and can't enter from the N utmost point magnetic line of force in the Nature; And, be subjected to the attraction of the magnetic line of force that sends from the N utmost point and enter flux loop from the S utmost point magnetic line of force in the Nature.See just in time on the contrary from the S level, repel the S magnetic line of force absorption of N utmost point magnetic line of force.Because thereby the intrusion of the extraneous magnetic line of force has changed the magnetic flux by coil, the reason and the process of extraneous electromagnetic interference (EMI) that Here it is.Be in the sensor of field environment, when stronger electromagnetic interference (EMI) occurring, some enters from sensor.The variation of passing the magnetic line of force of coil is one of reason that causes transducer distortion.Theoretically, this magnetic loop structure of traditional sensors does not possess the ability of anti-electromagnetic interference (EMI), and rise anti-electromagnetic interference (EMI) function be the metallic shield that forms of top cover and outer wall up and down, find in the reality, when electromagnetic interference (EMI) intensity acquires a certain degree, can produce interference, for example " serial induction " phenomenon in the seismic prospecting in the open air by the penetrating metal screen layer.
Fig. 2 is that three blocks of magnet steel of the anti-nafbetuc test of high precision are placed synoptic diagram, and the key distinction of it and traditional detector structure is to have increased by two blocks of secondary magnet steel.
Analyze the magnetic loop of this detector structure now.Because two blocks of secondary magnet steel are staggered relatively with the polarity at main magnet steel two ends respectively, according to principle of same-sex repulsion, force all magnetic lines of force of main magnet steel to turn back to the own other end, form main magnetic loop, and two blocks of secondary magnet steel form the secondary magnetic loop of oneself respectively.
Antimagnetic principle analysis: from the upper end of Fig. 2, the magnetic line of force of the middle main magnet steel S utmost point is subjected to the repulsion of the secondary magnet steel S utmost point in upper end and can't enters secondary magnetic loop, and the N utmost point magnetic line of force that the secondary magnet steel in upper end absorbs passes the repulsion that is subjected to the main magnet steel magnetic line of force behind the secondary magnet steel and is forced to from the upper end that secondary magnetic loop returns.Under correct on the contrary, the magnetic line of force of the N utmost point is subjected to the repulsion of the lower end secondary magnet steel N utmost point and can't enters secondary magnetic loop, the S utmost point magnetic line of force that absorbs passes the repulsion that is subjected to the main magnet steel magnetic line of force behind the secondary magnet steel and is forced to from the lower end that secondary magnetic loop returns.In the scope that coil moves, the external interference magnetic line of force that vertically passes coil is rejected entirely like this.In other words, the effect of two blocks of secondary magnet steel that increase at the two ends up and down of main magnet steel is refused outside electromagnetic interference in main magnetic loop outdoors as two walls respectively.The diameter of two blocks of secondary magnet steel of two ends increase helps the effect of electromagnetic screen as far as possible greater than the diameter of main magnet steel up and down; Coil lead is drawn from the edge of last secondary magnet steel, can not change the loop of going up secondary magnetic.The sensor of this structure (wave detector) has anti-electromagnetic interference capability, thereby has also improved its degree of distortion.
The effect of invention
The main seismoreceiver that is used at present the continental land earthquake exploration both at home and abroad has magnetic inductive and MEMS digital two big classes.The magnetic inductive seismoreceiver is also referred to as traditional analog wave detector (with 20DX-10HZ typical case representative), accounts for more than 70% of the market share.The digital geophone of new generation that utilizes the MEMS technology to make, owing to reasons such as manufacturing technology, price and subsequent treatment, large tracts of land is promoted the use of and also is subjected to certain limitation.In from now on 10 years, the traditional analog wave detector still accounts for sizable ratio.At present, the distortion index request of domestic wave detector is below 0.2%, and its dynamic range is less than 60dB, not as good as half of instrument dynamic range.As seen, how to improve wave detector self dynamic scope, become the bottleneck that improves the seismic prospecting quality, though can what improve to the seismic prospecting quality on earth to the dynamic range that improves wave detector, the notion of the present amount of not having, still, the dynamic range of wave detector is big more, its geological data just can react the geology general picture more really, and this is the common recognition of physical prospecting brainstrust.Thus, the wave detector of low distortion is to explore the wave detector of always pursuing in the industry.Use the wave detector that anti-electromagnetic interference (EMI) sensor construction technology manufactures, improve anti-electromagnetic interference capability of traditional detector and degree of distortion, prolong traditional analog wave detector life cycle, to replace present two strings or three to conspire to create be possible to a string wave detector of well-founded usefulness in the seismic prospecting of land.The ability that has anti-outside electromagnetic interference from principle; Next is a low distortion, and the distortion index may reach in the 0.025%--0.05 scope, makes its dynamic range improve 12-18dB on the basis of conventional wave detector, also improves 6-12dB than super wave detector.
Description of drawings
The sensor construction synoptic diagram of the anti-electromagnetic interference (EMI) of Fig. 1.
Three blocks of magnet steel of sensor of the anti-electromagnetic interference (EMI) of Fig. 2 are placed synoptic diagram.
Wherein: 1, lead-in wire 2, last secondary magnet steel 3, upper top cover 4, coil former 5, coil 6, spring 7, lower bottom cover 8, following secondary magnet steel 9, shell 10, lower magnetic steel frame 11, main magnet steel 12, upper magnetic steel frame
Embodiment
With reference to the accompanying drawings the sensor construction of described anti-electromagnetic interference (EMI) is explained below.
The sensor construction of anti-electromagnetic interference (EMI) of the present invention is a cylindrical structure, middle magnet steel is main magnet steel 11, the plastic coil frame 4 that main magnet steel overcoat one is not influenced by magnetic force, twine copper inductive coil 5 on the coil former, the coil former two ends are fixing by spring 6 extruding, but can do relative moving up and down with main magnet steel with the vibration in the external world; Main magnet steel two ends are fixed on two magnet steel framves 12 up and down, on 10, the magnet steel frame is fixed on shell 9 inwalls, two blocks of secondary magnet steel 2 about two magnet steel frame outer ends are fixed respectively up and down, 8, the diameter of two blocks of secondary magnet steel is greater than the diameter of hub of a spool master magnet steel up and down, diameter near shell, the polarity of two blocks of secondary magnet steel is staggered relatively with the polarity at main magnet steel two ends respectively up and down, N is extremely to the N utmost point, S is extremely to the S utmost point, upper top cover 3, lower bottom cover 7, two blocks of secondary magnet steel, two magnet steel framves, main magnet steel rigidly fixes with shell wall is in the same place the magnet steel fixed mount, upper top cover, lower bottom cover, with shell wall be good soft iron of magnetic conduction or aluminium alloy; The lead-in wire 1 usefulness hairspring of coil connects, and lead-in wire is from drawing near the magnet steel fixed mount of outer wall, last secondary magnet steel, upper top cover.
Claims (1)
1. the sensor of an anti-electromagnetic interference (EMI) is characterized in that:
Sensor is a cylindrical structure, middle magnet steel is main magnet steel, and the plastic coil frame that main magnet steel overcoat one is not influenced by magnetic force twines copper inductive coil on the coil former, the coil former two ends are fixing by the spring extruding, but can do relative moving up and down with main magnet steel with the vibration in the external world; Main magnet steel two ends are fixed on up and down on two magnet steel framves, the magnet steel frame is fixed on the outer casing inner wall, two blocks of secondary magnet steel about two magnet steel frame outer ends are fixed respectively up and down, the diameter of two blocks of secondary magnet steel is greater than the diameter of hub of a spool master magnet steel up and down, diameter near shell, the polarity of two blocks of secondary magnet steel is staggered relatively with the polarity at main magnet steel two ends respectively up and down, N is extremely to the N utmost point, S is extremely to the S utmost point, upper top cover, lower bottom cover, two blocks of secondary magnet steel, two magnet steel framves, main magnet steel rigidly fixes with shell wall is in the same place the magnet steel fixed mount, upper top cover, lower bottom cover, with shell wall be good soft iron of magnetic conduction or aluminium alloy; The lead-in wire of coil connects with hairspring, and lead-in wire is from drawing near the magnet steel fixed mount of outer wall, last secondary magnet steel, upper top cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100867491A CN101930078A (en) | 2009-06-26 | 2009-06-26 | Anti-electromagnetic interference sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100867491A CN101930078A (en) | 2009-06-26 | 2009-06-26 | Anti-electromagnetic interference sensor |
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| CN101930078A true CN101930078A (en) | 2010-12-29 |
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| CN2009100867491A Pending CN101930078A (en) | 2009-06-26 | 2009-06-26 | Anti-electromagnetic interference sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104428795A (en) * | 2012-09-05 | 2015-03-18 | 日立欧姆龙金融系统有限公司 | Magnetic recording medium reading device |
| CN107014403A (en) * | 2017-04-13 | 2017-08-04 | 西安振兴泽博智能震感科技有限公司 | A kind of moving-coil sensor movement |
| CN109459154A (en) * | 2018-11-09 | 2019-03-12 | 合肥亿珀电子材料有限公司 | A kind of sealed temperature sensor |
-
2009
- 2009-06-26 CN CN2009100867491A patent/CN101930078A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104428795A (en) * | 2012-09-05 | 2015-03-18 | 日立欧姆龙金融系统有限公司 | Magnetic recording medium reading device |
| CN104428795B (en) * | 2012-09-05 | 2017-03-01 | 日立欧姆龙金融系统有限公司 | Magnetic recording media reading device |
| CN107014403A (en) * | 2017-04-13 | 2017-08-04 | 西安振兴泽博智能震感科技有限公司 | A kind of moving-coil sensor movement |
| CN109459154A (en) * | 2018-11-09 | 2019-03-12 | 合肥亿珀电子材料有限公司 | A kind of sealed temperature sensor |
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Open date: 20101229 |