CN106225657A - Displacement transducer - Google Patents
Displacement transducer Download PDFInfo
- Publication number
- CN106225657A CN106225657A CN201610662236.0A CN201610662236A CN106225657A CN 106225657 A CN106225657 A CN 106225657A CN 201610662236 A CN201610662236 A CN 201610662236A CN 106225657 A CN106225657 A CN 106225657A
- Authority
- CN
- China
- Prior art keywords
- power supply
- regulated power
- coil
- agitator
- sensor
- 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.)
- Granted
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)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The invention discloses displacement transducer, including regulated power supply, agitator and testing circuit.Agitator, its energization input couples with the outfan of regulated power supply, has the coil that opposing metallic conductor is arranged.When metallic conductor moves closer to coil, agitator is gradually lowered oscillation amplitude, in order to regulated power supply is gradually reduced the electric current of its outfan.Testing circuit is adapted to detect for the signal of telecommunication of the current value corresponding to output end of stabilized voltage supply.Control unit couples with testing circuit, is suitable to calculate the distance of metallic conductor and coil according to the signal of telecommunication.
Description
Technical field
The present invention relates to monitoring of equipment technical field, particularly relate to displacement transducer.
Background technology
Displacement transducer is also called linear transducer, is a kind of linear unit belonging to metal sensing.Common displacement passes
Sensor e.g. Hall-type or eddy current type etc..Fig. 1 shows the operation principle of eddy-current transducer.Eddy current displacement sensor system
The working mechanism of system is by probe (i.e. the coil of coiling, is equivalent to inductance) and internal circuit one LC agitator of composition.Visiting
Head head produces alternating magnetic field H1.If not having metallic conductor close in the range of the H1 of magnetic field, then it is transmitted into this
Energy in the range of one all can all discharge.Whereas if having metallic conductor close to probe head, then alternating magnetic field H1 will
Produce current vortex field on the surface of conductor, this current vortex field also can produce a direction alternating magnetic field H2 contrary with H1.Due to
The retroaction of H2, will change amplitude and the phase place of probe head coil high-frequency electric current.
Fig. 2 shows the structured flowchart of common eddy current type displacement transducer.In this sensor, agitator is by fixing electricity
Hold and inductance (C in figure1、C2And Lx) parallel resonance method one high-frequency current signal of generation.Alternation magnetic is produced around probe head
Field H1.When metallic conductor is close to probe head, alternating magnetic field H1 produces current vortex field on the surface of conductor.This current vortex
Field will produce a direction alternating magnetic field H2 contrary with H1.Due to the retroaction of H2, probe head coil will be changed high
Frequently the amplitude of electric current and phase place.Thus, oscillation amplitude Ux of agitator can change with tested spacing δ with probe and change.Existing
Technical scheme be that Ux is carried out a series of process such as detection filter, amplification and linear correction, thus realize by output electricity
Pressure Uo value determines the value of probe and tested spacing δ.
But, in high-precision application scenarios, in existing displacement transducer, agitator is by environment shadows such as temperature
When ringing, there is the problems such as drift.Correspondingly, can there is deviation due to the impact of environmental condition in the measured value of displacement transducer.
To this end, the present invention proposes a kind of new displacement transducer technology scheme.
Summary of the invention
To this end, the present invention provides a kind of new displacement transducer technology scheme, effectively solve above-mentioned at least one
Problem.
According to an aspect of the present invention, it is provided that a kind of displacement transducer, including regulated power supply, agitator and detection electricity
Road.Agitator, its energization input couples with the outfan of regulated power supply, has the coil that opposing metallic conductor is arranged.At gold
Belong to agitator when conductor moves closer to coil and be gradually lowered oscillation amplitude, in order to regulated power supply is gradually reduced the electricity of its outfan
Stream.Testing circuit is adapted to detect for the signal of telecommunication of the current value corresponding to output end of stabilized voltage supply.Control unit and testing circuit coupling
Connect, be suitable to calculate according to the signal of telecommunication distance of metallic conductor and coil.
Alternatively, according in the displacement transducer of the present invention, the outfan of regulated power supply is provided with current sense resistor.
Testing circuit is adapted to detect for the magnitude of voltage at current sense resistor two ends as the signal of telecommunication.
Alternatively, according in the displacement transducer of the present invention, regulated power supply includes amplifier U1.The homophase of this amplifier
Input connects has DC source, inverting input to be provided with the first drop-down resistance R1.The outfan of regulated power supply is with anti-phase
Connect between input and have the second resistance R2.The outfan of regulated power supply and amplifier U1Outfan between connect have described electricity
Stream detection resistance R3。
Alternatively, according in the displacement transducer of the present invention, agitator includes transistor Q1.Transistor Q1Emitter stage is even
It is connected to the 4th drop-down resistance R4, it is connected between base stage with energization input VCC and has the 5th resistance R5.Transistor Q1Colelctor electrode with
The coil L and the first electric capacity C having parallel connection is connected between energization input VCC1.It is connected between emitter stage with colelctor electrode and has the second electricity
Hold C2.It is connected between emitter stage with energization input and has the 3rd electric capacity C3.The energization input VCC of agitator connects bypass electricity
Hold C4.When metallic conductor moves closer to coil L, current value is gradually reduced.
Alternatively, be suitable to determine current value according to the signal of telecommunication according to control unit in the displacement transducer of the present invention,
And the distance of metallic conductor and coil is calculated according to this current value.Sensor can also include the radio communication that control unit couples
Unit.Control unit is suitable to externally be transmitted calculated distance by this wireless communication unit.The most micro-process of control unit
Device (MCU).Wireless communication unit e.g. ZigBee.
To sum up, the displacement transducer technology scheme of the present invention from the angle of energy variation to oscillator coil and metallic conductor
Distance measure.When metallic conductor moves closer to the coil of agitator, regulated power supply export the electric current of agitator by
The least.Therefore, by the change of detection output end of stabilized voltage supply electric current, technical scheme can determine that metal is led
Body and the distance of coil.Although the oscillation amplitude of agitator is easily subject to environmental effect and offsets (such as temperature drift
Deng).But, the output current ratio oscillation amplitude of regulated power supply is affected much smaller by environment.Therefore, the displacement of the present invention
The mode of sensor ratio traditional measurement oscillation amplitude change has more preferable accuracy and capacity of resisting disturbance.
Accompanying drawing explanation
In order to realize above-mentioned and relevant purpose, herein in conjunction with explained below and accompanying drawing, some illustrative side is described
Face, these aspects indicate can to put into practice the various modes of principles disclosed herein, and all aspects and equivalence aspect
It is intended to fall under in the range of theme required for protection.By reading in conjunction with the accompanying detailed description below, the disclosure above-mentioned
And other purpose, feature and advantage will be apparent from.Throughout the disclosure, identical reference generally refers to identical
Parts or element.
Fig. 1 shows the fundamental diagram of eddy-current transducer；
Fig. 2 shows the structured flowchart of common eddy current type displacement transducer；
Fig. 3 shows the schematic diagram of displacement transducer 300 according to some embodiments of the invention；
Fig. 4 shows the schematic diagram of regulated power supply 400 according to an embodiment of the invention；And
Fig. 5 shows the schematic diagram of the agitator 500 according to an embodiment.
Detailed description of the invention
It is more fully described the exemplary embodiment of the disclosure below with reference to accompanying drawings.Although accompanying drawing shows the disclosure
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure and should be by embodiments set forth here
Limited.On the contrary, it is provided that these embodiments are able to be best understood from the disclosure, and can be by the scope of the present disclosure
Complete conveys to those skilled in the art.
Fig. 3 shows the schematic diagram of displacement transducer 300 according to some embodiments of the invention.As it is shown on figure 3, displacement passes
Sensor 300 includes regulated power supply 310, agitator 320, testing circuit 330 and control unit 340.Agitator 320 has gold relatively
Belong to the coil that conductor is arranged.Here, regulated power supply 310 is D.C. regulated power supply, can export stable electricity to agitator 320
Pressure.Here, regulated power supply 310 can be multiple known type voltage regulation DC source, it is also possible to be regulated power supply shown in Fig. 4.Shake
Swinging device 320 can be multiple known LC oscillating circuit, it is also possible to being the agitator shown in Fig. 5, this is not done too much by the present invention
Limit.Being different from traditional eddy current sensor (mode of the oscillation amplitude of detection agitator), the testing circuit 330 of the present invention is fitted
The signal of telecommunication in outfan (coupling with the energization input of agitator 320) the corresponding current value of detection regulated power supply 310.This
In, the magnitude of voltage at the signal of telecommunication e.g. current sense resistor two ends.But it is not limited to this, the side of known various detection size of current
Formula can be used for this invention.Control unit 340 for example, microprocessor (MCU), but it is not limited to this.
It should be noted that the displacement transducer 300 of the present invention from the angle of energy variation to agitator 320 coil with gold
The distance belonging to conductor (not shown) accounts for.Specifically, metallic conductor is when away from the coil of agitator 320, in coil
Energy is directly discharged.Metallic conductor near the coil of agitator 320 time, due to eddy current effect, eddy current in metallic conductor
Field energy can feed back to coil.Here, metallic conductor is the nearest with coil distance, and the energy feeding back to coil is the most.Correspondingly,
When metallic conductor moves closer to the coil of agitator 320, agitator 320 is gradually reduced oscillation amplitude, and makes regulated power supply
310 electric currents being gradually reduced outfan.
To sum up, when metallic conductor moves closer to the coil of agitator 320, regulated power supply 310 output is to agitator 320
Electric current is gradually reduced.So, control unit 340 can be according to regulated power supply 310 output end current obtained from testing circuit 330
Change, determines the distance of metallic conductor and coil.Specifically, control unit 340 is suitable to according to testing circuit 330 offer
The signal of telecommunication determines the current value of regulated power supply 310 outfan.And then, control unit 340 can calculate gold according to current value
Belong to the distance of conductor and coil.It addition, when the voltage signal that the signal of telecommunication is corresponding current value, control unit 340 can be direct
The distance of metallic conductor and coil is calculated according to voltage signal.Control unit 640 can also select to enter the distance calculated
Row storage.
Alternatively, the displacement transducer 300 of the present invention can also include wireless communication unit (not shown).Radio communication list
Unit e.g. ZigBee, it is also possible to be other communication units such as WiFi or 4G.Control unit 640 can select to pass through radio communication
The distance calculated externally is transmitted by unit.
Special instruction, when the distance of metallic conductor Yu coil is unchanged, the oscillation amplitude of agitator 320 is easily subject to
Environmental effect and offset (such as temperature drift etc.).But, the output current ratio oscillation amplitude of regulated power supply 310 is by ring
The impact in border is much smaller.Therefore, the mode that the displacement transducer 300 of the present invention changes than traditional measurement oscillation amplitude has more preferably
Accuracy and capacity of resisting disturbance.
Fig. 4 shows the schematic diagram of regulated power supply 400 according to an embodiment of the invention.As shown in Figure 4, regulated power supply
400 include amplifier U1.Amplifier U1In-phase input end connect have DC source.Amplifier U1Inverting input be provided with
Pull down resistor R1.It is connected between the outfan of regulated power supply 400 and inverting input and has the second resistance R2, the output of regulated power supply
End and amplifier U1Outfan between connect have current sense resistor R3.Here, current sense resistor R3It is the least resistance.
Testing circuit (330) can be by measuring R3Voltage, and using this voltage as the signal of telecommunication of corresponding regulated power supply output electric current.
Fig. 5 shows the schematic diagram of the agitator 500 according to an embodiment.As it is shown in figure 5, agitator 500 includes crystalline substance
Body pipe Q1.Transistor Q1Emitter stage connect have the 4th drop-down resistance R4, it is connected between base stage with energization input VCC and has
Five resistance R5.Transistor Q1Colelctor electrode and energization input VCC between be connected have parallel connection coil L and the first electric capacity C1.Crystal
Pipe Q1Emitter stage and colelctor electrode between be connected and have the second electric capacity C2, it is connected between emitter stage with energization input and has the 3rd electric capacity
C3.Alternatively, the energization input VCC of agitator 500 connects shunt capacitance C4。
In description mentioned herein, illustrate a large amount of detail.It is to be appreciated, however, that the enforcement of the present invention
Example can be put into practice in the case of not having these details.In some instances, it is not shown specifically known method, knot
Structure and technology, in order to do not obscure the understanding of this description.
Similarly, it will be appreciated that one or more in order to simplify that the disclosure helping understands in each inventive aspect, exist
Above in the description of the exemplary embodiment of the present invention, each feature of the present invention is grouped together into single enforcement sometimes
In example, figure or descriptions thereof.But, the method for the disclosure should not be construed to reflect an intention that i.e. required guarantor
The application claims protected is than the feature more features being expressly recited in each claim.More precisely, as following
As claims are reflected, inventive aspect is all features less than single embodiment disclosed above.Therefore, abide by
The claims following detailed description of the invention are thus expressly incorporated in this detailed description of the invention, the most each claim itself
Independent embodiment as the present invention.
Those skilled in the art are to be understood that the module of the equipment in example disclosed herein or unit or group
Part can be arranged in equipment as depicted in this embodiment, or alternatively can be positioned at and the equipment in this example
In different one or more equipment.Module in aforementioned exemplary can be combined as a module or be segmented into multiple in addition
Submodule.
Those skilled in the art are appreciated that and can carry out the module in the equipment in embodiment adaptively
Change and they are arranged in one or more equipment different from this embodiment.Can be the module in embodiment or list
Unit or assembly are combined into a module or unit or assembly, and can put them in addition multiple submodule or subelement or
Sub-component.In addition at least some in such feature and/or process or unit excludes each other, can use any
Combine all features disclosed in this specification (including adjoint claim, summary and accompanying drawing) and so disclosed appoint
Where method or all processes of equipment or unit are combined.Unless expressly stated otherwise, this specification (includes adjoint power
Profit requires, summary and accompanying drawing) disclosed in each feature can be carried out generation by providing identical, equivalent or the alternative features of similar purpose
Replace.
Although additionally, it will be appreciated by those of skill in the art that embodiments more described herein include other embodiments
Some feature included by rather than further feature, but the combination of the feature of different embodiment means to be in the present invention's
Within the scope of and form different embodiments.Such as, in the following claims, embodiment required for protection appoint
One of meaning can mode use in any combination.
Additionally, some in described embodiment be described as at this can be by the processor of computer system or by performing
The method of other device enforcement of described function or the combination of method element.Therefore, have for implementing described method or method
The processor of the necessary instruction of element is formed for implementing the method or the device of method element.Additionally, device embodiment
This described element is the example of following device: this device is for implementing by performed by the element of the purpose in order to implement this invention
Function.
As used in this, unless specifically stated so, ordinal number " first ", " second ", " the 3rd " etc. is used
Describe plain objects and be merely representative of the different instances relating to similar object, and be not intended to imply that the object being so described must
Must have the time upper, spatially, sequence aspect or in any other manner to definite sequence.
Although the embodiment according to limited quantity describes the present invention, but benefits from above description, the art
In it is clear for the skilled person that in the scope of the present invention thus described, it can be envisaged that other embodiments.Additionally, it should be noted that
The language that uses in this specification primarily to the readable and purpose of teaching and select rather than in order to explain or limit
Determine subject of the present invention and select.Therefore, in the case of without departing from the scope of the appended claims and spirit, for this
For the those of ordinary skill of technical field, many modifications and changes will be apparent from.For the scope of the present invention, to this
The disclosure that invention is done is illustrative and not restrictive, and it is intended that the scope of the present invention be defined by the claims appended hereto.
Claims (9)
1. a displacement transducer, including:
Regulated power supply；
Agitator, its energization input couples with the outfan of regulated power supply, has the coil that opposing metallic conductor is arranged, at gold
Belong to conductor to move closer to be gradually lowered oscillation amplitude during coil, in order to regulated power supply is gradually reduced the electric current of outfan；And
Testing circuit, is adapted to detect for the signal of telecommunication of the current value corresponding to output end of stabilized voltage supply；And
Control unit, couples with testing circuit, is suitable to calculate the distance of metallic conductor and coil according to this signal of telecommunication.
2. sensor as claimed in claim 1, wherein, the outfan of described regulated power supply is provided with current sense resistor；
Described testing circuit, is adapted to detect for the magnitude of voltage at current sense resistor two ends as the described signal of telecommunication.
3. sensor as claimed in claim 1 or 2, wherein, described regulated power supply includes amplifier (U1), this amplifier (U1)
In-phase input end connect have DC source, inverting input to be provided with the first drop-down resistance (R1), the output of regulated power supply
End has the second resistance (R with being connected between inverting input2), the outfan of regulated power supply and amplifier (U1) outfan between
Connect and have described current sense resistor (R3)。
4. the sensor as according to any one of claim 1-3, wherein, described agitator includes transistor (Q1),
Its emitter stage connects the 4th drop-down resistance (R4), it is connected between its base stage with energization input (VCC) and has the 5th resistance
(R5),
Coil (L) and the first electric capacity (C having parallel connection it is connected between its colelctor electrode with energization input VCC1),
It is connected between its emitter stage with colelctor electrode and has the second electric capacity (C2),
It is connected between its emitter stage with energization input and has the 3rd electric capacity (C3)。
5. sensor as claimed in claim 4, wherein, the energization input (VCC) of described agitator connects shunt capacitance
(C4)。
6. the sensor as according to any one of claim 1-5, described control unit is further adapted for:
Described current value is determined according to the described signal of telecommunication；
The distance of described metallic conductor and coil is calculated according to this current value.
7. the sensor as according to any one of claim 1-6, also includes the wireless communication unit coupled with control unit；
Described control unit is suitable to externally be transmitted calculated distance by this wireless communication unit.
8. the sensor as according to any one of claim 1-7, wherein, described control unit includes microprocessor (MCU).
9. sensor as claimed in claim 7 or 8, wherein, described wireless communication unit is ZigBee.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610662236.0A CN106225657B (en) | 2016-08-12 | 2016-08-12 | displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610662236.0A CN106225657B (en) | 2016-08-12 | 2016-08-12 | displacement sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106225657A true CN106225657A (en) | 2016-12-14 |
| CN106225657B CN106225657B (en) | 2019-12-06 |
Family
ID=57548141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610662236.0A Active CN106225657B (en) | 2016-08-12 | 2016-08-12 | displacement sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106225657B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112400143A (en) * | 2019-08-02 | 2021-02-23 | 深圳市越疆科技有限公司 | Sensing circuit, logic circuit board, joint control board, main controller board and robot |
| CN114018144A (en) * | 2021-10-28 | 2022-02-08 | 上海隐冠半导体技术有限公司 | Sensor detection circuit and sensor detection method |
| CN116772702A (en) * | 2023-08-24 | 2023-09-19 | 河南卫华重型机械股份有限公司 | Eddy current distance acquisition circuit |
| CN117029660A (en) * | 2023-07-26 | 2023-11-10 | 深圳市华怡丰科技有限公司 | Method and circuit for detecting distance of metal object |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6114501A (en) * | 1984-06-30 | 1986-01-22 | Nippon Kokan Kk <Nkk> | Eddy current type range finder |
| JPS6182117A (en) * | 1984-09-29 | 1986-04-25 | Nippon Kokan Kk <Nkk> | Direct current feedback type eddy current range finder |
| CN2283829Y (en) * | 1996-12-10 | 1998-06-10 | 姚广仁 | Intelligence magnetic means coating thickness measuring instrument |
| CN201247043Y (en) * | 2008-08-19 | 2009-05-27 | 江祥红 | Linear corrective circuit for electric vortex flow sensor |
| CN102072694A (en) * | 2010-12-15 | 2011-05-25 | 北京经纬恒润科技有限公司 | Eddy current distance sensor |
| CN105333808A (en) * | 2015-11-25 | 2016-02-17 | 珠海格力节能环保制冷技术研究中心有限公司 | Displacement detection circuit, eddy current displacement sensor as well as correcting circuit and method thereof |
-
2016
- 2016-08-12 CN CN201610662236.0A patent/CN106225657B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6114501A (en) * | 1984-06-30 | 1986-01-22 | Nippon Kokan Kk <Nkk> | Eddy current type range finder |
| JPS6182117A (en) * | 1984-09-29 | 1986-04-25 | Nippon Kokan Kk <Nkk> | Direct current feedback type eddy current range finder |
| CN2283829Y (en) * | 1996-12-10 | 1998-06-10 | 姚广仁 | Intelligence magnetic means coating thickness measuring instrument |
| CN201247043Y (en) * | 2008-08-19 | 2009-05-27 | 江祥红 | Linear corrective circuit for electric vortex flow sensor |
| CN102072694A (en) * | 2010-12-15 | 2011-05-25 | 北京经纬恒润科技有限公司 | Eddy current distance sensor |
| CN105333808A (en) * | 2015-11-25 | 2016-02-17 | 珠海格力节能环保制冷技术研究中心有限公司 | Displacement detection circuit, eddy current displacement sensor as well as correcting circuit and method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112400143A (en) * | 2019-08-02 | 2021-02-23 | 深圳市越疆科技有限公司 | Sensing circuit, logic circuit board, joint control board, main controller board and robot |
| CN112400143B (en) * | 2019-08-02 | 2023-09-08 | 深圳市越疆科技股份有限公司 | Sensing circuit, logic circuit board, joint control board, master controller board and robot |
| CN114018144A (en) * | 2021-10-28 | 2022-02-08 | 上海隐冠半导体技术有限公司 | Sensor detection circuit and sensor detection method |
| CN117029660A (en) * | 2023-07-26 | 2023-11-10 | 深圳市华怡丰科技有限公司 | Method and circuit for detecting distance of metal object |
| CN116772702A (en) * | 2023-08-24 | 2023-09-19 | 河南卫华重型机械股份有限公司 | Eddy current distance acquisition circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106225657B (en) | 2019-12-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106225657A (en) | Displacement transducer | |
| CN108593999A (en) | A kind of Zero flux current sensor | |
| EP2558822B1 (en) | An electromagnetic method for sensing the relative position of two items using coupled tuned circuits | |
| CN103245819B (en) | Magnetic excitation resonant piezoresistive cantilever beam is adopted to measure the method for DC current or DC voltage | |
| CN109283379A (en) | Method, device and equipment for measuring current of lead and readable storage medium | |
| CN102003973A (en) | Wireless passive measuring method and circuit | |
| CN101706526A (en) | Measuring method and device of pulse width detection type magnetic modulation direct current | |
| CN106645387A (en) | Pulse magnetoelastic and magnetic flux leakage integrated detection system for detecting cable force and damage of stay cable | |
| WO2003038371A1 (en) | Displacement sensor | |
| CN203630195U (en) | Giant magnetoresistance current sensor | |
| CN102252795B (en) | A capacitive cable force sensor | |
| CN113028965A (en) | Giant magnetoresistance detection device of magnetostrictive displacement sensor | |
| CN107202966A (en) | The measuring method and system of a kind of alternate stray field of Transformer Winding | |
| EP3105602B1 (en) | Sensor and method for electric current measurement | |
| CN105318935A (en) | Wide-range mutual-induction type liquid metal liquidometer | |
| CN102645582A (en) | High-accuracy frequency measurement system | |
| CN105223266B (en) | A kind of electromagnetic acoustic detection method and device from perception operating point | |
| CN103808453B (en) | There is in bandwidth of operation the electromagnetic exciter of amplitude self-stabilization sine-wave excitation power | |
| CN108732403B (en) | Current sensor and magnetic flux balancing circuit thereof | |
| RU2631916C1 (en) | Method of controlling fluid media flow measurement by electromagnetic flowmeter | |
| CN116256007A (en) | Second-order space symmetric time-symmetry passive wireless sensing system based on singular point | |
| CN109387665A (en) | Speed detector and speed detection method | |
| CN203572435U (en) | Weak strain measurement system | |
| JP2014222163A (en) | Inspection circuit of magnetic field detector and inspection method of the same | |
| CN106093457B (en) | Rotating speed sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |