CN101788259B - Double-wire differential-type magnetostrictive displacement sensor - Google Patents
Double-wire differential-type magnetostrictive displacement sensor Download PDFInfo
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- CN101788259B CN101788259B CN2010101174587A CN201010117458A CN101788259B CN 101788259 B CN101788259 B CN 101788259B CN 2010101174587 A CN2010101174587 A CN 2010101174587A CN 201010117458 A CN201010117458 A CN 201010117458A CN 101788259 B CN101788259 B CN 101788259B
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Abstract
The invention provides a double-wire differential-type magnetostrictive displacement sensor, relates to the technical field of sensors, and solves the technical problem of improving detection accuracy. A framework, a fixed block, signal generation assemblies and a measuring circuit are arranged in a casing of the sensor, wherein the framework and the fixed block are fixed at two ends of the inner wall of the casing respectively. The sensor is characterized in that: two sets of signal generation assemblies are provided; each set of the signal generation assemblies comprises a waveguide wire, an induction coil and a shielding device; one end of each waveguide wire is a near end and the other end of each waveguide wire is a far end; the near ends of two waveguide wires are arranged in two bores of the framework respectively, and the far ends of the two waveguide wires are arranged on the fixed block and connected to each other through a connection lead; the axial lines of the two waveguide wires are parallel to each other; two induction coils are coaxially wound at the peripheries of the two bores on the framework respectively and connected to the measuring circuit after being in series-opposing connection; and two shielding devices are coaxially sleeved at the peripheries of the induction coils of the assemblies respectively. The sensor provided by the invention has high detection accuracy.
Description
Technical field
The present invention relates to the technology of sensor, particularly relate to a kind of technology of double-wire differential-type magnetostrictive displacement sensor.
Background technology
Magnetostrictive displacement sensor is that Wiedemann (Wiedeman) effect and prestige Larry (Villary) effect of utilizing magnetostriction materials realize the non-cpntact measurement device that absolute displacement is measured; Have excellent properties such as range is big, noncontact, precision is high, speed is fast, degree of protection is high, cost is low, be widely used in industries such as machinery, building, lathe.
Because magnetostrictive displacement sensor is to rely on electromagnetic signal work; Can receive the influence of the electromagnetic interference (EMI) of external electromagnetic field in use; Can cause introducing in the inductive coil undesired signal (being electrical noise) of various different rules; And waveguide filament itself can produce random vibration after being encouraged, and also can cause the generation of electrical noise signal; Therefore, reducing noise is the problem that magnetostrictive displacement sensor must solve;
Existing magnetostrictive displacement sensor all adopts the processing of circuit technology to reduce noise effect, to improve measuring accuracy and stability.The method of this reduction noise does not improve signal to noise ratio (S/N ratio) from the signal source; When noise effect in the signal source was big, its noise reduction was relatively poor, and the method for this reduction noise is because circuit is very complicated; The adjustment difficulty, therefore the accuracy of detection of existing magnetostrictive displacement sensor is not high.
Summary of the invention
To the defective that exists in the above-mentioned prior art, technical matters to be solved by this invention provides the high double-wire differential-type magnetostrictive displacement sensor of a kind of accuracy of detection.
In order to solve the problems of the technologies described above, a kind of double-wire differential-type magnetostrictive displacement sensor provided by the present invention comprises shell and magnet assemblies, and skeleton, fixed block, signal generating assembly and metering circuit are housed in the said shell; Said skeleton, fixed block are individually fixed in the two ends of outer casing inner wall; Said magnet assemblies is movably installed on the outer wall of shell, and can moving axially along shell; It is characterized in that: said signal generating assembly has two groups; Every group of signal generating assembly comprises a waveguide filament, an inductive coil and a shielding device, and each parts in every group of signal generating assembly all with another group signal generating assembly in each corresponding component identical;
Said skeleton is provided with the endoporus that two axis are parallel to each other, respectively corresponding two groups of signal generating assemblies;
End in the two ends of every waveguide filament is a near-end, and the other end is a far-end; The near-end of two waveguide filaments is installed on respectively in two endoporus of skeleton; And each is electrically connected metering circuit through an excitation wire; The far-end of two waveguide filaments all is installed on the fixed block; And through a connection wire interconnects, the axis of two waveguide filaments is parallel to each other, and the line between the near-end of two waveguide filaments is perpendicular to the axis of two waveguide filaments;
Two inductive coils are coaxial respectively to be set around on the skeleton periphery with the corresponding endoporus of this assembly, and inserts metering circuit after the differential concatenation; In the two ends of each inductive coil, an end that is positioned at fixed block one side is a near-end, and the other end is a far-end, and the line between the near-end of two inductive coils is perpendicular to the axis of two waveguide filaments;
Two coaxial respectively peripheries that are sheathed on the inductive coil of this assembly of shielding device, in the two ends of each shielding device, an end that is positioned at fixed block one side is a near-end, and the other end is a far-end, and the line between the near-end of two shielding devices is perpendicular to the axis of two waveguide filaments.
Further, said shielding device is the annular permanent magnet that periphery is arranged with ferromagnetic protective sleeve.
Further, the far-end of every waveguide filament is equipped with damper.
Further, the periphery of every waveguide filament all is arranged with protective casing, and an end and the skeleton of each protective casing are affixed, and the other end and fixed block are affixed.
Further, the outer wall of said shell is equipped with socket, and said socket is electrically connected metering circuit.
Double-wire differential-type magnetostrictive displacement sensor provided by the invention; Adopt two groups of signal generating assemblies to pick up the positional information of magnet assemblies; Through two opposite polarity inductive impulses of two groups of signal generating assembly output; Owing to two inductive coil differential concatenations in two groups of signal generating assemblies constitute differential form, therefore the signal intensity of the total output signal of two groups of signal generating assembly outputs is twices of the output signal strength of individual signals generating assembly; And owing to the noise signal that exists in two groups of signal generating assemblies is identical, therefore disturbs in the total output signal of two groups of signal generating assembly outputs with the noise meeting and significantly reduce, can improve accuracy of detection; In addition; Owing to adopted annular permanent magnet that periphery is arranged with ferromagnetic protective sleeve as the shielding device; Therefore can protect electromagnetic interference (EMI) and magnet assemblies that the differential type coil resists external space effectively near the time influence that produced, and effectively improve the quality of electrical signal of reaction in the differential type coil.
Description of drawings
Fig. 1 is the structural representation of the double-wire differential-type magnetostrictive displacement sensor of the embodiment of the invention;
Fig. 2 is the induction coil configuration synoptic diagram of the double-wire differential-type magnetostrictive displacement sensor of the embodiment of the invention;
Fig. 3 is the inductive coil and the structural representation that shields device of the double-wire differential-type magnetostrictive displacement sensor of the embodiment of the invention.
Embodiment
Below in conjunction with description of drawings embodiments of the invention are described in further detail, but present embodiment is not limited to the present invention, every employing analog structure of the present invention and similar variation thereof all should be listed protection scope of the present invention in.
Like Fig. 1-shown in Figure 3, a kind of double-wire differential-type magnetostrictive displacement sensor that the embodiment of the invention provided comprises shell 9 and magnet assemblies 8, and skeleton 3, fixed block 12, signal generating assembly and metering circuit 13 are housed in the said shell 9; Said skeleton 3, fixed block 12 are individually fixed in the two ends of shell 9 inwalls; Said magnet assemblies 8 is movably installed on the outer wall of shell 9, and can moving axially along shell 9; It is characterized in that:
Said signal generating assembly has two groups, and every group of signal generating assembly comprises a waveguide filament 6, an inductive coil 5 and a shielding device 4, and each parts in every group of signal generating assembly all with another group signal generating assembly in each corresponding component identical;
Said skeleton 3 is provided with the endoporus that two axis are parallel to each other, respectively corresponding two groups of signal generating assemblies;
End in the two ends of every waveguide filament 6 is a near-end, and the other end is a far-end; The near-end of two waveguide filaments 6 is installed on respectively in two endoporus of skeleton 3; And each is electrically connected metering circuit 13 through an excitation wire 2; The far-end of two waveguide filaments 6 all is installed on the fixed block 12; And through a connection lead 11 interconnection, the axis of two waveguide filaments is parallel to each other, and the line between the near-end of two waveguide filaments is perpendicular to the axis of two waveguide filaments 6;
Two inductive coils 5 are coaxial respectively to be set around on the skeleton 3 periphery with the corresponding endoporus of this assembly, and differential concatenation (referring to Fig. 2) is after signal conductor 14 inserts metering circuits 13; In the two ends of each inductive coil 5, an end that is positioned at fixed block 12 1 sides is a near-end, and the other end is a far-end, and the line between the near-end of two inductive coils 5 is perpendicular to the axis of two waveguide filaments 6;
Two coaxial respectively peripheries that are sheathed on the inductive coil 5 of this assembly of shielding device 4; In the two ends of each shielding device 4; An end that is positioned at fixed block 12 1 sides is a near-end, and the other end is a far-end, and the line between the near-end of two shielding devices 4 is perpendicular to the axis of two waveguide filaments 6;
In the embodiment of the invention, the periphery of every waveguide filament 6 all is arranged with protective casing 7, and an end and the skeleton 3 of each protective casing 7 are affixed, and the other end and fixed block 12 are affixed; The far-end of every waveguide filament 6 is equipped with damper 10; The outer wall of said shell 9 is equipped with socket 1, and said socket 1 is electrically connected metering circuit 13; Said shielding device 4 (referring to Fig. 3) is the annular permanent magnet 16 that periphery is arranged with ferromagnetic protective sleeve 17;
During embodiment of the invention work; The driving pulse that is produced by metering circuit is loaded on two waveguide filaments through excitation wire; Thereby produce one perpendicular to the toroidal magnetic field of two waveguide filament axis and with the light velocity two waveguide filament transmission in edge; When the intrinsic magnetic field that is produced in magnet assemblies position and magnet assemblies when this magnetic field met, helical magnetic field of the superimposed formation of the magnetic vector of the two produced instantaneous torsion thus and on every waveguide filament, forms a mechanical torsional wave; This torsional wave transmits respectively along two waveguide filaments with supersonic speed, and at the far-end of two waveguide filaments, torsional wave is absorbed by damper; At the near-end of two waveguide filaments, torsional wave converts inductive impulse into after being picked up respectively by two inductive coils; Through measuring the mistiming between the inductive impulse that driving pulse and torsional wave return generation, just can accurately calculate the position of magnet assemblies, thereby can realize the measurement of phase magnet assembly absolute displacement size;
In the embodiment of the invention; Because the flow direction of electric current in two waveguide filaments of driving pulse is opposite; Therefore the torsional direction of two formed mechanical torsional waves of waveguide filament also is opposite, makes that the polarity of the inductive impulse that two inductive coils are exported also is opposite; Because two inductive coils are differential concatenations, make that the inductive impulse of two inductive coils subtracts each other (promptly constituting differential form), therefore the signal intensity of the total output signal of two inductive coil outputs is twices of the inductive impulse signal intensity of single inductive coil; And since the noise signal that exists in two inductive coils (for example: from the electromagnetic interference (EMI) of space outerpace; Or by noises that factor produced such as internal electric source fluctuation, waveguide filament vibrations) be identical; Therefore disturb in the total output signal of two inductive coil outputs with noise and can significantly reduce, can improve accuracy of detection;
In the embodiment of the invention; Because the shielding device is the annular permanent magnet that periphery is arranged with ferromagnetic protective sleeve; The annular permanent magnet can form a powerful stable direct current internal magnetic field at the inductive coil surrounding space; Ferromagnetic protective sleeve can prevent that magnetic field from leaking, therefore can protect electromagnetic interference (EMI) and magnet assemblies that inductive coil resists external space effectively near the time influence that produced, thereby shorten its dead band length; And because the shielding device is annular; Its magnetic pole is distributed in two fragment position; Therefore can form a stabilizing magnetic field with shielding device parallel axes in that the shielding device is inner, this magnetic field can make the waveguide filament near-end produce part to magnetize, thereby effectively improves inductive impulse quality of signals in the inductive coil.
Claims (5)
1. a double-wire differential-type magnetostrictive displacement sensor comprises shell and magnet assemblies, and skeleton, fixed block, signal generating assembly and metering circuit are housed in the said shell; Said skeleton, fixed block are individually fixed in the two ends of outer casing inner wall; Said magnet assemblies is movably installed on the outer wall of shell, and can moving axially along shell; It is characterized in that: said signal generating assembly has two groups; Every group of signal generating assembly comprises a waveguide filament, an inductive coil and a shielding device, and each parts in every group of signal generating assembly all with another group signal generating assembly in each corresponding component identical;
Said skeleton is provided with the endoporus that two axis are parallel to each other, respectively corresponding two groups of signal generating assemblies;
End in the two ends of every waveguide filament is a near-end, and the other end is a far-end; The near-end of two waveguide filaments is installed on respectively in two endoporus of skeleton; And each is electrically connected metering circuit through an excitation wire; The far-end of two waveguide filaments all is installed on the fixed block; And through a connection wire interconnects, the axis of two waveguide filaments is parallel to each other, and the line between the near-end of two waveguide filaments is perpendicular to the axis of two waveguide filaments;
Two inductive coils are coaxial respectively to be set around on the skeleton periphery with the corresponding endoporus of this group signal generating assembly, and inserts metering circuit after the differential concatenation; In the two ends of each inductive coil, an end that is positioned at fixed block one side is a near-end, and the other end is a far-end, and the line between the near-end of two inductive coils is perpendicular to the axis of two waveguide filaments;
Two coaxial respectively peripheries that are sheathed on the inductive coil of this assembly of shielding device, in the two ends of each shielding device, an end that is positioned at fixed block one side is a near-end, and the other end is a far-end, and the line between the near-end of two shielding devices is perpendicular to the axis of two waveguide filaments.
2. double-wire differential-type magnetostrictive displacement sensor according to claim 1 is characterized in that: said shielding device is the annular permanent magnet that periphery is arranged with ferromagnetic protective sleeve.
3. double-wire differential-type magnetostrictive displacement sensor according to claim 1 and 2 is characterized in that: the far-end of every waveguide filament is equipped with damper.
4. double-wire differential-type magnetostrictive displacement sensor according to claim 1 and 2 is characterized in that: the periphery of every waveguide filament all is arranged with protective casing, and an end and the skeleton of each protective casing are affixed, and the other end and fixed block are affixed.
5. double-wire differential-type magnetostrictive displacement sensor according to claim 1 and 2 is characterized in that: the outer wall of said shell is equipped with socket, and said socket is electrically connected metering circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101174587A CN101788259B (en) | 2010-03-04 | 2010-03-04 | Double-wire differential-type magnetostrictive displacement sensor |
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| CN2010101174587A CN101788259B (en) | 2010-03-04 | 2010-03-04 | Double-wire differential-type magnetostrictive displacement sensor |
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| CN101788259A CN101788259A (en) | 2010-07-28 |
| CN101788259B true CN101788259B (en) | 2012-09-05 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010039055A1 (en) | 2010-08-09 | 2012-02-09 | Balluff Gmbh | Displacement measuring device |
| CN102435129B (en) * | 2011-09-08 | 2013-06-19 | 华中科技大学 | Coplanar detector for measuring position of two-dimensional moving part |
| CN102589403B (en) * | 2012-01-12 | 2014-07-02 | 上海交通大学 | Magnetostriction displacement sensor with compensation function |
| CN103591881B (en) * | 2013-10-14 | 2016-04-27 | 然斯康波达机电设备(深圳)有限公司 | Full-measuring-rangemagnetostrictive magnetostrictive displacement sensor |
| JP6050778B2 (en) * | 2014-03-31 | 2016-12-21 | 京セラドキュメントソリューションズ株式会社 | Differential transformer permeability sensor |
| CN103994712B (en) * | 2014-04-28 | 2016-09-14 | 安徽华盛科技控股股份有限公司 | Passive linear displacement transducer |
| WO2016141967A1 (en) | 2015-03-09 | 2016-09-15 | Balluff Gmbh | Magnetostrictive path-measuring device and method for operating a magnetorestrictive path-measuring device |
| CN105674866B (en) * | 2016-01-13 | 2018-03-23 | 南京南瑞集团公司 | A kind of low dead band magnetostrictive displacement sensor |
| JP6458742B2 (en) | 2016-01-20 | 2019-01-30 | オムロン株式会社 | Proximity sensor |
| DE102016114561A1 (en) | 2016-08-05 | 2018-02-08 | Balluff Gmbh | Magnetostrictive displacement measuring device and method for producing a sensor of a magnetostrictive displacement measuring device |
| CN109539967B (en) * | 2018-12-29 | 2020-06-05 | 潍坊学院 | Device for accurately detecting mechanical part hole by magnetostrictive sensor |
| CN110243271B (en) * | 2019-07-10 | 2020-11-20 | 浙江凯悦纺织股份有限公司 | Size measuring device for clothing production |
| US11519710B2 (en) * | 2020-02-26 | 2022-12-06 | Honeywell Limited | High accuracy and high stability magnetic displacement sensor in the presence of electromagnetic interferences |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5196791A (en) * | 1991-09-27 | 1993-03-23 | Magnetek Controls | Magnetostrictive linear position detector and a dual pole position magnet therefor |
| CN2307282Y (en) * | 1997-06-05 | 1999-02-10 | 电力工业部电力自动化研究院 | Displacement measuring capacitance sensor |
| CN201059954Y (en) * | 2007-07-10 | 2008-05-14 | 鞍山维盛机电有限公司 | Magnetic telescopic displacement sensor |
| CN101593599A (en) * | 2009-04-01 | 2009-12-02 | 西安理工大学 | A kind of electromagnetic field device of large-scale production of giant magnetic materials |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202006012815U1 (en) * | 2006-08-17 | 2007-12-20 | Mts Sensor Technologie Gmbh & Co. Kg | travel length |
-
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- 2010-03-04 CN CN2010101174587A patent/CN101788259B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5196791A (en) * | 1991-09-27 | 1993-03-23 | Magnetek Controls | Magnetostrictive linear position detector and a dual pole position magnet therefor |
| CN2307282Y (en) * | 1997-06-05 | 1999-02-10 | 电力工业部电力自动化研究院 | Displacement measuring capacitance sensor |
| CN201059954Y (en) * | 2007-07-10 | 2008-05-14 | 鞍山维盛机电有限公司 | Magnetic telescopic displacement sensor |
| CN101593599A (en) * | 2009-04-01 | 2009-12-02 | 西安理工大学 | A kind of electromagnetic field device of large-scale production of giant magnetic materials |
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Application publication date: 20100728 Assignee: Shanghai magnetostrictive Measuring System Co Ltd Assignor: Shanghai Renywell Measurement Technology Co.,Ltd. Contract record no.: 2014310000085 Denomination of invention: Double-wire differential-type magnetostrictive displacement sensor Granted publication date: 20120905 License type: Exclusive License Record date: 20140506 |
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