CN105674866B - A kind of low dead band magnetostrictive displacement sensor - Google Patents
A kind of low dead band magnetostrictive displacement sensor Download PDFInfo
- Publication number
- CN105674866B CN105674866B CN201610021283.7A CN201610021283A CN105674866B CN 105674866 B CN105674866 B CN 105674866B CN 201610021283 A CN201610021283 A CN 201610021283A CN 105674866 B CN105674866 B CN 105674866B
- Authority
- CN
- China
- Prior art keywords
- detection coil
- measuring circuit
- sleeve pipe
- magnet
- circuit plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
Abstract
The invention discloses a kind of low dead band magnetostrictive displacement sensor, measuring circuit front edge of board is connected with the cable drawn from cable connector, and measuring circuit plate rear end is fixed on measuring staff front end by pedestal；Movement is provided with position magnet on the measuring staff；Metal protective sleeve pipe is socketed with measuring staff, metal protective sleeve pipe front end is provided with detection coil, and end is provided with metal plug; the waveguide filament is arranged in metal protective sleeve pipe; after detection coil, it is fixed in metal plug, waveguide filament front end is connected with measuring circuit plate；The detection coil is connected with measuring circuit plate；The metal protective sleeve pipe front end is connected by lead with measuring circuit plate；On the outside of the metal protective sleeve pipe compensating magnet is provided with detection coil.A kind of low dead band magnetostrictive displacement sensor provided by the invention, suppressing detection coil transient response by way of compensating magnet is added at detection coil, magnetostrictive displacement sensor dead band is reduced, improves sensor linearity.
Description
Technical field
The present invention relates to a kind of low dead band magnetostrictive displacement sensor, belong to technology of instrument and meter field.
Background technology
Magnetostrictive displacement sensor is a kind of direct magnetostriction effect using ferromagnetic material and converse magnetostriction effect
The displacement transducer that should be formed.Magnetostrictive displacement sensor is by the way that displacement physical quantity to be converted into time of two pulse signals
It is spaced to set up the corresponding relation between time and displacement, has measurement accuracy high, measurement range is big, and simple in construction is excellent
Point, it is widely used in the fields such as hydraulic cylinder detection, machine tool motion detection.
At present, magnetostrictive displacement sensor has and can surveyed along the position magnet of sensor length direction slidably
High current inquiry pulse is loaded during amount first on waveguide filament, inquiry pulses generation toroidal magnetic field is propagated along waveguide filament,
Toroidal magnetic field produces interaction with position magnetic field of magnets at the magnet of position, and echo is produced in waveguide filament along the past passback of waveguide filament
Broadcast and received by detection means.By measure send inquiry pulse to the time interval between receives echo-signal come settling time with
Corresponding relation between displacement.Due to magnetostrictive displacement sensor usually using coil as echo detection device, in big electricity
When flowing inquiry pulse loading, detection coil can produce transient response, and the transient response of coil can cause magnetostrictive displacement to pass
The dead band of sensor.
Transient response is the inherent characteristic of detection coil, though regulation measuring circuit RC parameters can reduce transient response,
Also the acquisition of echo-signal can be influenceed simultaneously.Therefore existing magnetostrictive displacement sensor generally evades this in structure design
One dead band.
The content of the invention
Purpose：In order to overcome the deficiencies in the prior art, the present invention provides a kind of low dead band magnetostrictive displacement and passed
Sensor.
Technical scheme：In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of low dead band magnetostrictive displacement sensor, including cable connector, measuring circuit plate, pedestal, guard shield, survey
Bar, position magnet, pole cap, waveguide filament, compensating magnet, detection coil, metal plug, metal protective sleeve pipe, the cable connector
It is connected with guard shield front end, guard shield rear end is connected with measuring staff front end；Measurement electricity is provided with the guard shield
Road plate, measuring circuit front edge of board are connected with the cable drawn from cable connector, and measuring circuit plate rear end is fixed on by pedestal
Measuring staff front end；Movement is provided with position magnet on the measuring staff；Metal protective sleeve pipe is socketed with measuring staff, before metal protective sleeve pipe
End is provided with detection coil, and end is provided with metal plug, and the waveguide filament is arranged in metal protective sleeve pipe, through detection line
After circle, it is fixed in metal plug, waveguide filament front end is connected with measuring circuit plate；The detection coil and measuring circuit plate phase
Connection；The metal protective sleeve pipe front end is connected by lead with measuring circuit plate；It is close on the outside of the metal protective sleeve pipe
Compensating magnet is provided with detection coil；The measuring staff rear end is socketed with pole cap.
Preferably, in addition to rubber inhales wave apparatus, and the rubber inhales wave apparatus and is socketed in waveguide filament end.
Preferably, the compensating magnet is arranged to long 1.6mm, wide 1.2mm, thick 1mm rectangular parallelepiped structures.
Preferably, the compensating magnet uses ferrite material.
Beneficial effect：A kind of low dead band magnetostrictive displacement sensor provided by the invention, by close to detection coil
Place adds the mode of compensating magnet to suppress detection coil transient response, reduces magnetostrictive displacement sensor dead band, improves and pass
The sensor linearity.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is measuring staff partial sectional view；
Fig. 3 is existing magnetostrictive displacement sensor working signal waveform diagram；
Fig. 4 is working signal waveform diagram of the present invention.
Embodiment
The present invention is further described below in conjunction with the accompanying drawings.
As shown in Figure 1 and Figure 2, a kind of low dead band magnetostrictive displacement sensor, including cable connector 1, measuring circuit plate 2,
Pedestal 3, guard shield 4, measuring staff 5, position magnet 6, pole cap 7, waveguide filament 8, compensating magnet 9, detection coil 10, metal plug
11st, metal protective sleeve pipe 12, the cable connector 1 are connected with the front end of guard shield 4, the rear end of guard shield 4 and the front end of measuring staff 5
It is connected；Measuring circuit plate 2, the front end of measuring circuit plate 2 and the electricity drawn from cable connector 1 are provided with the guard shield 4
Cable is connected, and the rear end of measuring circuit plate 2 is fixed on the front end of measuring staff 5 by pedestal 3；Movement is provided with position magnetic on the measuring staff 5
Iron 6；Metal protective sleeve pipe 12 is socketed with measuring staff 5, the front end of metal protective sleeve pipe 12 is provided with detection coil 10, and end is provided with
Metal plug 11, the waveguide filament 8 is arranged in metal protective sleeve pipe 12, after detection coil 10, is fixed on metal plug
Interior 11, the front end of waveguide filament 5 is connected with measuring circuit plate 2；The detection coil 10 is connected with measuring circuit plate 2；The gold
The category front end of protection sleeve pipe 12 is connected by lead with measuring circuit plate 2；The outside of metal protective sleeve pipe 12 is close to detection line
Enclose at 10 and be provided with compensating magnet 9；The rear end of measuring staff 5 is socketed with pole cap 7.Also include rubber and inhale wave apparatus 13, the rubber
Inhale wave apparatus 13 and be socketed in the end of waveguide filament 8, to absorb the vibration wave being transferred to herein.
Specific works mode is as follows：Metal protection protector pipe end is connected by metal plug waveguide filament, and head end passes through lead
It is connected with measuring circuit plate.When measuring circuit plate sends inquiry pulse, pulse current is formed along waveguide filament and metal protective sleeve pipe
Circuit loop flowing.Cable connector, guard shield, metal plug, pole cap, which cooperate, realizes the anti-of displacement transducer entirety
Protect grade.
Compensating magnet is fixed on outside metal protective sleeve pipe at detection coil, and its axially mounted position is needed according to biography
Sense device working signal waveform is adjusted.In order to be adjusted to the installation site of compensating magnet, it is necessary first to regulating winding
RC parameters so that echo-signal caused by the magnet of position can detected circuit capture, then observation oscilloscope coil transient state
The region of response, clamp compensating magnet with tweezers and moved along metal protective sleeve pipe return, when compensating magnet is moved to a certain position,
The transient response of the suppression detection coil of echo-signal energy amplitude peak, the position are compensating magnet caused by compensating magnet
Installation site, after determining installation site, compensating magnet is fixed on the installed position with glue.
As shown in figure 3, vs is inquiry pulse signal, vo is detection coil detection signal.Surveyed in measurement procedure each time
Amount circuit loads high current inquiry pulse, toroidal magnetic field and the permanent magnetic field at the magnet of position of inquiry pulses generation on waveguide filament
Interaction produces echo impulse, and echo impulse is detected Coil Detector and arrived.Inquiry pulse is sent with receiving echo by measuring
The time interval tm of pulse can obtain corresponding displacement information.Inquiry pulse is the heavy current pulse that pulsewidth is musec order,
Transient response, coil transient response meeting interference echo signal, therefore magnetostrictive displacement sensor can be produced in detection coil
Intrinsic dead band be present in stem.The transient response of coil can maintain the t0 times, usually 30 to 35 microseconds.Therefore this period
Corresponding waveguide filament length is sensor dead band x0.
As shown in figure 4, in order to reduce the dead band of magnetostrictive displacement sensor, the present invention is proposed close to detection coil
Position adds compensating magnet.The installation site of compensating magnet determines according to coil transient response region.Returned caused by compensating magnet
Wave impulse can be overlapped mutually with the waveform of detection coil transient response, so as to effectively suppress detection coil transient response, be reduced
Sensor dead band.Dotted line waveform is respectively detection coil transient response waveform and compensating magnet echo waveform, the waveform after superposition
As shown by the solid line.Comparison diagram 3 can be found that compensating magnet significantly suppress detection coil transient response, reduces the dead of sensor
Area.Further, when not adding compensating magnet, the transient response of detection coil must be discharged by RC circuits,
After the t0 times, coil transient response can also have a gradual index decreased component, although now sensor measuring circuit can be with
The echo-signal of enough catch position magnet, but its gamut linear characteristic can be remained the shadow of transient response by detection coil
Ring.After compensating magnet is added, the transient response of detection coil has obtained fast and effeciently suppressing, and it is residual can to eliminate detection coil
Influence of the transient response to measurement is stayed, therefore compensating magnet can also improve the overall linearity of sensor.
Described above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (4)
1. a kind of low dead band magnetostrictive displacement sensor, including cable connector, measuring circuit plate, pedestal, guard shield, survey
Bar, position magnet, pole cap, it is characterised in that：Also include waveguide filament, compensating magnet, detection coil, metal plug, metal coating
Sleeve pipe, the cable connector are connected with guard shield front end, and guard shield rear end is connected with measuring staff front end；Outside the protection
Measuring circuit plate is provided with shell, measuring circuit front edge of board is connected with the cable drawn from cable connector, after measuring circuit plate
End is fixed on measuring staff front end by pedestal；Movement is provided with position magnet on the measuring staff；Metal protection protector is socketed with measuring staff
Pipe, metal protective sleeve pipe front end are provided with detection coil, and end is provided with metal plug, and the waveguide filament is arranged on metal coating
In sleeve pipe, after detection coil, it is fixed in metal plug, waveguide filament front end is connected with measuring circuit plate；The detection
Coil is connected with measuring circuit plate；The metal protective sleeve pipe front end is connected by lead with measuring circuit plate；The gold
On the outside of category protection sleeve pipe compensating magnet is provided with detection coil；The axially mounted position of compensating magnet is needed according to biography
Sense device working signal waveform is adjusted, when compensating magnet is moved to a certain position, echo-signal caused by compensating magnet
The transient response of the suppression detection coil of energy amplitude peak, the position is the installation site of compensating magnet；The measuring staff rear end
It is socketed with pole cap.
A kind of 2. low dead band magnetostrictive displacement sensor according to claim 1, it is characterised in that：Also include rubber to inhale
Wave apparatus, the rubber inhale wave apparatus and are socketed in waveguide filament end.
A kind of 3. low dead band magnetostrictive displacement sensor according to claim 1 or 2, it is characterised in that：The compensation
Magnet is arranged to long 1.6mm, wide 1.2mm, thick 1mm rectangular parallelepiped structures.
A kind of 4. low dead band magnetostrictive displacement sensor according to claim 3, it is characterised in that：The compensating magnet
Using ferrite material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610021283.7A CN105674866B (en) | 2016-01-13 | 2016-01-13 | A kind of low dead band magnetostrictive displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610021283.7A CN105674866B (en) | 2016-01-13 | 2016-01-13 | A kind of low dead band magnetostrictive displacement sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105674866A CN105674866A (en) | 2016-06-15 |
| CN105674866B true CN105674866B (en) | 2018-03-23 |
Family
ID=56300401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610021283.7A Active CN105674866B (en) | 2016-01-13 | 2016-01-13 | A kind of low dead band magnetostrictive displacement sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105674866B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108594311A (en) * | 2018-06-11 | 2018-09-28 | 中国石油天然气集团公司 | A kind of harmonic source detection device and method based on magnetostriction cable |
| CN110081806A (en) * | 2019-05-10 | 2019-08-02 | 南京南瑞水利水电科技有限公司 | A kind of magnetostrictive displacement sensor device, system and calibration method |
| CN113932881B (en) * | 2021-10-15 | 2023-11-10 | 常州市成丰流量仪表有限公司 | Method for measuring and calculating dead zone-free magnetostrictive material level sensor |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6232769B1 (en) * | 1998-06-16 | 2001-05-15 | Balluff, Inc. | Modular waveguide assembly for a position sensor and method for making the same |
| US20050114053A1 (en) * | 2003-10-14 | 2005-05-26 | Southward Steve C. | Magnetostrictive wavelet method for measuring pulse propagation time |
| CN101788259B (en) * | 2010-03-04 | 2012-09-05 | 上海雷尼威尔测量技术有限公司 | Double-wire differential-type magnetostrictive displacement sensor |
| CN102589403B (en) * | 2012-01-12 | 2014-07-02 | 上海交通大学 | Magnetostriction displacement sensor with compensation function |
| CN103486958B (en) * | 2013-09-30 | 2016-03-23 | 湖南宇航科技有限公司 | The tension installation method of a kind of magnetostrictive displacement sensor and waveguide filament thereof |
-
2016
- 2016-01-13 CN CN201610021283.7A patent/CN105674866B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN105674866A (en) | 2016-06-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105674866B (en) | A kind of low dead band magnetostrictive displacement sensor | |
| CN202018514U (en) | Shielding magnetic probe for transient electromagnetic receiving antenna | |
| CN209102918U (en) | A kind of transient electromagnetic apparatus | |
| CN102305901B (en) | Method for detecting cable fault point by impact oscillating wave principle | |
| CN207965113U (en) | Shield magnetic saturation performance testing device under low-frequency pulse strong magnetic field circumstance | |
| GB1491507A (en) | Inductive displacement transducer | |
| CN105954362B (en) | The supersonic guide-wave generator quickly detected for pipeline | |
| CN103234443A (en) | Wide-range magnetostrictive displacement sensor measuring device and method | |
| CN105068027A (en) | Intelligent magnetic sensor and vehicle detection method based on same | |
| CN102680857A (en) | Power cable fault locator | |
| CN108363106A (en) | A kind of detecting metal pipeline system and method based on time domain electromagnetic method | |
| CN202600098U (en) | Power cable fault positioning instrument | |
| CN101852775B (en) | Device for regulating magnetostrictive detection of longitudinal static magnetic field | |
| CN108415086A (en) | The receiving coil and transmitting coil of the active pcb board of Transient Electromagnetic Apparatus | |
| CN105021961A (en) | Aerial insulation line partial discharge detection and positioning device and method | |
| CN102096090B (en) | Beam signal monitoring device of electronic linear accelerator | |
| RU2681416C1 (en) | Device for searching for damages of insulation of high-voltage cable | |
| CN209055625U (en) | A kind of power cable shelf depreciation locating and detecting device | |
| CN110594596A (en) | Water pipe network leakage detection circuit | |
| CN103163388A (en) | Measuring method and measuring device of non-contact electrostatic spraying charge-to-mass ratios | |
| CN206281877U (en) | A kind of intelligent lightning calculating instrument support | |
| US4538082A (en) | High-output magnetic field transducer | |
| CN203069802U (en) | Quasi-overlap loop device of mining transient electromagnetic instrument | |
| CN211826244U (en) | Impact grounding impedance testing device | |
| CN201689078U (en) | Apparatus for modulating magnetostriction to detect longitudinal static magnetic field |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |