CN1243240A - Displacement sensor - Google Patents
Displacement sensor Download PDFInfo
- Publication number
- CN1243240A CN1243240A CN 99109841 CN99109841A CN1243240A CN 1243240 A CN1243240 A CN 1243240A CN 99109841 CN99109841 CN 99109841 CN 99109841 A CN99109841 A CN 99109841A CN 1243240 A CN1243240 A CN 1243240A
- Authority
- CN
- China
- Prior art keywords
- magnetic core
- full
- coil
- displacement transducer
- signal processing
- 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.)
- Pending
Links
Images
Landscapes
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
A displacement sensor comprises a magnetic core composed of magnetic material and linked by the same parts, a coil tube with magnetic core surrounding its outside, a first and a second coil winding the coil tube, and a signal treatment unit for detecting magnetic core position changes according to induced voltages over the first and the second coil. Said sensor is capable of detecting position changes of parts without adopting a resistor and then avoids unnecessary power consumption; and is capable of detecting position changes of parts with high precision by enabling position change detection signals to exhibit linear characteristics, without depending on a signal treatment unit which outside is separated.
Description
The present invention relates to a kind of displacement transducer, particularly a kind of displacement transducer that is applicable to the detection part position.
Fig. 1 is the principle assumption diagram of the displacement transducer of prior art, wherein is wound with two coils 2 and 3 on the bobbin 1 of displacement transducer, magnetic core 4 that magnetic material is made and the parts interlock in the bobbin 1.
Fig. 2 is the circuit diagram of prior art displacement transducer, and wherein the resistance of resistor R 1 and R2 is identical, applies AC power AC to change the inductance Z1 and the Z2 of coil on the magnetic core 2 and 3 by the outside.
That is to say, when magnetic core 4 because parts drive when occurrence positions changes, can produce one with the proportional output voltage (e of magnetic core 4 change in location
0); If magnetic core 4 is placed the center of bobbin 1,, make output voltage (e because two coils 2 are identical with Z2 with 3 inductance Z1
0) be zero (" 0 "), then can detect part displacements.
Yet there is following problem in the displacement transducer of prior art: because essential two resistors that adopt resistance to equate when the load end impedance is low, will adopts the resistor of low resistance, thereby easily cause zero point drift.Therefore, need to adopt the precision resistor of high value.
Also have a problem in addition, for the degree of accuracy that improves displacement transducer will adopt the AC power of high voltage, the thermal losses height on the resistor causes unnecessary power consumption like this.
Purpose of the present invention exactly for addressing the above problem.Thereby one of its purpose provides a kind of displacement transducer that resistor can be avoided unnecessary power loss and be suitable for the detection part displacement that do not rely on.
Another one purpose of the present invention provides a kind of displacement transducer that makes tested displacement have linear feature and do not rely on external signal processing apparatus, thus detection part displacement accurately.
By above-mentioned purpose of the present invention, provide a kind of displacement transducer that is used for the detection part position at this, this sensor comprises:
One make by magnetic material and with the magnetic core of parts interlock;
A bobbin that surrounds magnetic core in the outside;
First coil and second coil on the bobbin; And
Signal processing unit according to first and second coil induced potentials detection magnetic core change in location, this signal processing unit comprises:
First full wave rectifier that is used for the first coil induced potential is carried out full-wave rectification;
Second full wave rectifier that is used for the second coil induced potential is carried out full-wave rectification;
One is used for differential amplifier that the voltage difference after the first and second full wave rectifier full-wave rectifications is amplified; And
A filter unit that is used to filter differential amplifier output signal medium-high frequency component.
In order more fully to understand target of the present invention and characteristics, should consult accompanying drawing and read following detailed description of the present invention, wherein:
Fig. 1 is the principle assumption diagram of prior art displacement transducer;
Fig. 2 is the circuit diagram of prior art displacement transducer;
Fig. 3 is the principle assumption diagram of displacement transducer of the present invention;
Fig. 4 is the circuit diagram of displacement transducer of the present invention;
Fig. 5 is the circuit diagram of full wave rectifier among Fig. 4;
Fig. 6 is the circuit diagram of differential amplifier among Fig. 4;
Fig. 7 is the circuit diagram of filter unit and peak detection unit among Fig. 4;
Fig. 8 is the curve map of explanation according to the displacement detecting result of displacement transducer of the present invention.
Referring now to accompanying drawing in detail most preferred embodiment of the present invention is described in detail.
Fig. 3 is the principle assumption diagram of displacement transducer of the present invention, Fig. 4 is the circuit diagram of displacement transducer of the present invention, wherein displacement transducer comprises: by magnetic material make and with the magnetic core 10 of parts interlocks, surround the bobbin 11 of magnetic core 10 outside, symmetry is around first coil 12 and second coil 13 of bobbin 11 top and bottom, and the signal processing unit 20 that detects magnetic core 10 change in location according to induced potential on first and second coils 12 and 13.
As shown in Figure 5, first and second full wave rectifiers 21 and 22 are made up of a plurality of resistor R 1-R7, diode D1 and D2, capacitor C1 and operational amplifier (OP) U1 and U2; As shown in Figure 6, differential amplifier comprises that a plurality of resistor R 8-R11 and operational amplifier U1 of Y form.
In addition, as shown in Figure 7, filter unit 24 is made up of a plurality of resistor R 12-R14, capacitor C2 and operational amplifier U3; Peak detection unit 25 comprises diode D3 and D4 and capacitor C3 and C4.
Working condition by the displacement transducer of the present invention's structure like this now is described in detail in detail.
When frequency be the external AC power AC of 2 KHz (KHz) to first and second coils 12 and 13 power supplies and the position of magnetic core 10 because component locations variation when changing, to produce on first and second coils 12 and 13 and the proportional induced potential of magnetic core 10 change in location, first and second full wave rectifiers 21 and 22 pairs of voltages of inducting on first and second coils 12 and 13 carry out full-wave rectification respectively and export the result to differential amplifier 23.
In addition, 23 pairs of voltage differences through first and second full wave rectifiers 21 and 22 full-wave rectifications of differential amplifier are amplified and the result are exported to filter unit 24.
Situation according to magnetic core 10 change in location, signal magnitude respective change by differential amplifier 23 outputs, when being in bobbin 11 central authorities, magnetic core 10 is output as " 0 " V, when magnetic core 10 is positioned at the top of bobbin 11, be output as "+" V, when magnetic core 10 is positioned at the bottom of bobbin 11, be output as "-" V.
That is to say, change, should remove the high fdrequency component in differential amplifier 23 output signals in order to make microcomputer 30 can detect position component according to the output signal of differential amplifier 23.
As a result, by what filter unit 24 was exported be and the proportional voltage signal of component locations, and in very wide scope, have linear feature, as shown in Figure 8 by the voltage signal of filter unit 24 outputs.
In addition, more need to detect than the centre position in the extreme higher position and the extreme lower position of a lot of application scenarios parts, thereby only need detect desired value.The maximal value and the minimum value of 25 pairs of filter unit 24 output signals of peak detection unit detect and are entered into microcomputer 30, thereby can satisfy above-mentioned requirements.
In other words, even peak detctor 25 also can be kept its minimum and maximum value under the situation that the parts physical location changes, thereby microcomputer 30 can read and utilize this minimum and maximum value in expeced time.
Advantage by above-mentioned obviously visible displacement transducer of the present invention has does not namely adopt resistor yet But the change in location of detection part, thereby avoided unnecessary power attenuation. An other advantage is, In the situation that does not rely on the signal processing apparatus that adopts external separation, make detected change in location letter Number have linear character, thus can be with the change in location of pinpoint accuracy detection part very.
Claims (3)
1. a displacement transducer that is used for the detection part position is characterized in that, this sensor pack
Draw together:
One make by magnetic material and with the magnetic core of parts interlock;
A bobbin that surrounds described magnetic core in the outside;
First and second coils on the described bobbin; And
Basis induced potential on described first and second coils detects the signal processing unit of described magnetic core change in location.
2. sensor according to claim 1 is characterized in that, this signal processing unit comprises:
One is used for first full wave rectifier that the described first coil induced potential is carried out full-wave rectification;
One is used for second full wave rectifier that the described second coil induced potential is carried out full-wave rectification;
The differential amplifier that voltage difference after the described first and second full wave rectifier full-wave rectifications is amplified; And
The filter unit that described differential amplifier output signal medium-high frequency component is carried out filtering.
3. sensor according to claim 2 is characterized in that, described signal processing unit also comprises a peak detection unit that is used to detect described filter unit output signal maximal value and minimum value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99109841 CN1243240A (en) | 1998-07-22 | 1999-07-16 | Displacement sensor |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR9829503 | 1998-07-22 | ||
| CN 99109841 CN1243240A (en) | 1998-07-22 | 1999-07-16 | Displacement sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1243240A true CN1243240A (en) | 2000-02-02 |
Family
ID=5274191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99109841 Pending CN1243240A (en) | 1998-07-22 | 1999-07-16 | Displacement sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1243240A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108413857A (en) * | 2018-05-08 | 2018-08-17 | 河北布鲁克科技有限公司 | A kind of travel range metering installation and method of steel wire rope |
| CN111412826A (en) * | 2020-04-09 | 2020-07-14 | 华中科技大学 | Double-helix-tube differential inductive sensor based on amplitude-phase detection technology |
| CN111707175A (en) * | 2019-03-18 | 2020-09-25 | Tdk株式会社 | Signal processing circuit, position detection device, and magnetic sensor system |
-
1999
- 1999-07-16 CN CN 99109841 patent/CN1243240A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108413857A (en) * | 2018-05-08 | 2018-08-17 | 河北布鲁克科技有限公司 | A kind of travel range metering installation and method of steel wire rope |
| CN111707175A (en) * | 2019-03-18 | 2020-09-25 | Tdk株式会社 | Signal processing circuit, position detection device, and magnetic sensor system |
| CN111412826A (en) * | 2020-04-09 | 2020-07-14 | 华中科技大学 | Double-helix-tube differential inductive sensor based on amplitude-phase detection technology |
| CN111412826B (en) * | 2020-04-09 | 2021-07-27 | 华中科技大学 | Double-helix-tube differential inductive sensor based on amplitude-phase detection technology |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1083981C (en) | DC and AC current sensor having a minor-loop orperated current transformer | |
| CN1243248C (en) | Current sensor | |
| US9080852B2 (en) | Displacement sensor and a magnetic bearing system using the same | |
| US20020162403A1 (en) | Magnetoelastic torque sensor | |
| CN109556647B (en) | Low-frequency noise suppression device and method for tunnel magnetoresistance effect sensor | |
| CN1712973A (en) | Device for the reading of direct and/or alternating currents | |
| CN1131434C (en) | Power supply circuit for electricity meter | |
| US6429639B1 (en) | Combined filter inductor and hall current sensor | |
| CN107014405A (en) | A kind of self difference inductive displacement transducer for magnetic levitation bearing system | |
| US5278500A (en) | Planar, core saturation principle, low flux magnetic field sensor | |
| CN111323737B (en) | Impedance sensitive type magnetic sensor and hardware detection circuit thereof | |
| US20050103126A1 (en) | Integrating fluxgate for magnetostrictive torque sensors | |
| CN101031779A (en) | Position sensor | |
| CN1243240A (en) | Displacement sensor | |
| CN1267734C (en) | Double detection type current sensor | |
| CN1168992C (en) | D.C. current sensing device | |
| CN1904629A (en) | Three terminal type magnetic flow gate sensor | |
| CN1211666C (en) | Impedance-to-voltage converter and converting method | |
| Kano et al. | New type linear variable differential transformer position transducer | |
| JP2000046503A (en) | Displacement sensor | |
| JPS6243429B2 (en) | ||
| CN2670951Y (en) | Current sensor | |
| EP2781887A1 (en) | Variable inductance type position sensor system and method | |
| CN1641365A (en) | Zero-flux current sensor circuit | |
| CN1044990A (en) | Auto measurement equipment for magnetic material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |