CN109470130B - Transmitting-receiving differential type eddy current displacement detection device - Google Patents
Transmitting-receiving differential type eddy current displacement detection device Download PDFInfo
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- CN109470130B CN109470130B CN201811653065.0A CN201811653065A CN109470130B CN 109470130 B CN109470130 B CN 109470130B CN 201811653065 A CN201811653065 A CN 201811653065A CN 109470130 B CN109470130 B CN 109470130B
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 30
- 238000001514 detection method Methods 0.000 title abstract description 17
- 239000000523 sample Substances 0.000 claims abstract description 19
- 238000004804 winding Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
Classifications
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- 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
- G01B7/023—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring distance between sensor and object
Abstract
The invention discloses a transmitting-receiving differential type eddy current displacement detection device. The device comprises a sine wave generating circuit, a transmitting-receiving differential type sensor probe, a first filter, a feedback circuit, an inverting amplifier, an in-phase amplifier, a voltage doubling rectifying circuit, an LC filter, a microprocessor, a keyboard and a display, wherein the sine wave generating circuit, the transmitting-receiving differential type sensor probe, the first filter, the inverting amplifier, the in-phase amplifier, the voltage doubling rectifying circuit, the LC filter and the microprocessor are sequentially connected, the output end of the feedback circuit is connected with the input end of the inverting amplifier, and the input end of the feedback circuit is connected with the keyboard and the display of the output end of the in-phase amplifier. The invention adopts two-stage amplifier direct coupling and depth negative feedback to obtain high gain and inhibit gain drift and spurious interference, and adopts band-pass filter to improve the selectivity of the amplifier and the accuracy of displacement detection.
Description
Technical Field
The present invention relates to a displacement detecting device, and more particularly, to a transmitting-receiving differential eddy current displacement detecting device.
Background
The eddy current displacement detection is a nondestructive detection technology based on an electromagnetic induction principle, and the eddy current displacement detection device is widely applied to the fields of industrial automation, mechanical manufacturing, aerospace and the like. The eddy current sensor usually has impedance mode, bridge mode, transmitting-receiving mode and other modes, and weak displacement eddy current detection signals often have a plurality of interference signals, such as common mode interference, interference caused by temperature drift, various interference such as direct current level shift in the amplifying process and the like, and the interference signals in the eddy current detection signals must be suppressed to be within an allowable range so as to effectively identify useful displacement information. The existing eddy current displacement detection device has more problems in eliminating various interference signals, so that the accuracy and reliability of displacement detection are not high.
Disclosure of Invention
In order to solve the technical problems of the conventional eddy current displacement detection device, the invention provides a transmitting-receiving differential eddy current displacement detection device with high accuracy and reliability.
The technical scheme for solving the technical problems is as follows: the output of the sine wave generating circuit is connected with an oscillating coil of the transmitting-receiving differential type sensor probe, the output end of the transmitting-receiving differential type sensor probe, the first filter, the inverting amplifier, the voltage doubling rectifying circuit, the LC filter and the microprocessor are sequentially connected, the keyboard and the display are connected with the microprocessor, and the microprocessor is provided with an A/D, D/A and a communication interface.
The transmitting-receiving differential type eddy current displacement detection device further comprises a feedback circuit, wherein the output end of the feedback circuit is connected with the input end of the inverting amplifier, and the input end of the feedback circuit is connected with the output end of the inverting amplifier.
In the transmitting-receiving differential type eddy current displacement detection device, the feedback circuit is formed by serially connecting an integrator and a second filter, wherein the input end of the integrator is connected with the output end of the in-phase amplifier, and the output end of the second filter is connected with the input end of the inverting amplifier.
In the above-mentioned transmitting-receiving differential type eddy current displacement detecting device, the transmitting-receiving differential type sensor probe includes a transmitting coil W 0 Receiving coil W 1 、W 2 Receiving coil W 1 And W is 2 The reverse polarities are connected in series to form a differential receiving coil.
The invention has the technical effects that: first receiving coil W in sensor probe in the invention 1 And a second receiving coil W 2 Same parameter reverse serial connection to form differential receiving coil W 1 W 2 Suppressing temperature drift and common-mode interference of receiving coil, directly coupling with two-stage amplifier, and deep negative feedback to obtain high gain while suppressing gain drift and spurious interference, applying band-pass filter to improve amplifier selectivity, and suppressing receiving coil W with narrow-band filtering characteristic 1 W 2 The maximum useful information is obtained by the broadband noise in the detection system, and the accuracy of displacement detection is improved.
Drawings
Fig. 1 is a functional block diagram of the present invention.
FIG. 2 is a schematic diagram of the structure of a sensor probe according to the present invention.
FIG. 3 shows a sensor probe exciting coil W according to the present invention 0 A schematic structural diagram.
FIG. 4 shows a sensor probe receiving coil W according to the present invention 1 W 2 A schematic structural diagram.
FIG. 5 is a schematic diagram of a differential type eddy current displacement sensor for transmitting and receiving signals according to the present invention.
In fig. 1 to 5: 1 is a sine wave generating circuit, 2 is an eddy current sensor probe, 3 is a band-pass filter, 4 is an inverting amplifier Q 1 5 is an in-phase amplifier Q 2 6 is an integrator Q 3 The low-pass filter is 7, the voltage-multiplying rectifying circuit is 8, and the L is 9 2 C 2 The filter 10 is microprocessor STM32,11 is keyboard and display, 12 is analog output terminal, 13 is CAN communication interface, 14 is probe shell, 15 is filler, 16 is interlayer insulating paper, 17 is skeleton, 18 is exciting coil W 0 Reference numeral 19 denotes a first receiving coil W 1 20 is a second receiving coil W 2 21 is an air gap, 22 is a measured object, 23 is a front end of a skeleton (also a front end of a probe), 24 is a rear end of the skeleton (also a rear end of the probe), W 1 W 2 Is a differential receiving coil.
Detailed Description
The invention is further described below with reference to the accompanying drawings and specific examples.
As shown in fig. 1 to 5, a transmitting-receiving differential type eddy current displacement detecting device comprises a sine wave generating circuit 1, an eddy current sensor probe 2, and a bandpassFilter 3, low pass filter 7 and L 2 C 2 A filter 9, an inverting amplifier 4, an in-phase amplifier 5, an integrator 6, a voltage doubling rectifying circuit 8, a microprocessor 10 and a keyboard and display 11. The output end of the quartz crystal oscillator sine wave generating circuit 1 is externally connected with C 0 Parallel transmitting coil W 0 18, generating a sine wave excitation signal with constant frequency and amplitude. The manufacturing method of the transmitting-receiving coil comprises the following steps: firstly, a transmission coil W is uniformly wound on a non-magnetic framework 17 0 18, transmitting coil W 0 After 18 is wound, a layer of insulating paper 16 is coated on the outer surface of the shell, and as shown in fig. 4, a first receiving coil W is uniformly wound in the forward direction from the front end 23 of the framework, i.e. the lowest position of the front end of the probe 1 19, when winding to one half of the frame 17, starting to uniformly wind the second receiving coil W in the opposite direction 2 20, two receiving coils W 1 And W is 2 Receiving coil forming differential structure, W 1 And W is 2 The spatial positions of the two magnetic fields are different, the distances from the detected object are different, and the strength of the eddy current magnetic field generated by the detected object is different, so that W 1 And W is 2 The induced potentials in the two receiving coils are different, and the differential receiving coil W 1 W 2 The resulting potential of (2) is: the output of the band-pass filter 3 is the input of an inverting amplifier 4, which is the input signal +.>Suppressing wideband noise in a narrowband filtering mode; the direct coupling and deep negative feedback of the inverting amplifier 4 and the non-inverting amplifier 5 are adopted, the DC level shift existing in the operational amplifier circuit must be controlled and the spurious interference is restrained while the high-gain useful signal is obtained, otherwise, the measurement precision is affected, in the embodiment, the servo tracking negative feedback link consisting of the amplifiers 4 and 5 as preamplifiers, the integrator 6 and the RC filter 7 is adopted, and the preamplifiers are ensured to haveHigh gain, high stability and reliability, and high multiple noise ratio. The de-noised amplified displacement signal is output V from the output end of the in-phase amplifier 5 3 Voltage V 3 The information is rectified into direct current voltage and L by a voltage doubling rectifying circuit 8 2 C 2 After the filter 9, the digital displacement is transmitted to an A/D input end of the microprocessor (10) for A/D conversion, the microprocessor processes displacement information according to the magnetic permeability and the electric conductivity of different measured objects, corrects and compensates the displacement, displays the actually measured displacement on a display, converts the digital displacement into analog voltage, and outputs the displacement analog voltage from a D/A output end so as to be convenient for external equipment to use, and CAN realize intelligent and network control through a CAN interface 13 of the microprocessor 10.
Claims (3)
1. A transmitting-receiving differential type eddy current displacement detecting device, characterized in that: the device comprises a sine wave generating circuit, a transmitting-receiving differential type sensor probe, a first filter, an inverting amplifier, an in-phase amplifier, a voltage doubling rectifying circuit, an LC filter, a microprocessor, a keyboard and a display, wherein the output of the sine wave generating circuit is connected with an oscillating coil of the transmitting-receiving differential type sensor probe, the output end of the transmitting-receiving differential type sensor probe, the first filter, the inverting amplifier, the in-phase amplifier, the voltage doubling rectifying circuit, the LC filter and the microprocessor are sequentially connected, the keyboard and the display are connected with the microprocessor, and the microprocessor is provided with an A/D, D/A and a communication interface; the output end of the feedback circuit is connected with the input end of the inverting amplifier, and the input end of the feedback circuit is connected with the output end of the non-inverting amplifier; the transmitting-receiving differential sensor probe comprises a transmitting coil W 0 Receiving coil W 1 、W 2 Receiving coil W 1 And W is 2 Reverse polarity is connected in series to form a differential receiving coil; the transmitting coil W 0 The coil is uniformly wound on the non-magnetic framework, and the coil W is sent 0 After winding, at W 0 An insulating paper layer is coated on the outer surface, and a first receiving coil W is uniformly wound from the lowest position of the front end of the framework in the forward direction 1 Winding to one half of the skeleton to start reverse uniform winding W 2 Receiving coil W 1 And W is 2 The turns are equal, the wire diameters are the same, and the winding directions are opposite.
2. The transmitting-receiving differential type eddy current displacement detecting device as claimed in claim 1, wherein: the feedback circuit is formed by serially connecting an integrator and a second filter, wherein the input end of the integrator is connected with the output end of the in-phase amplifier, and the output end of the second filter is connected with the input end of the inverting amplifier.
3. The transmitting-receiving differential type eddy current displacement detecting device as claimed in claim 1, wherein: the LC filter is an LC series resonant circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811653065.0A CN109470130B (en) | 2018-12-29 | 2018-12-29 | Transmitting-receiving differential type eddy current displacement detection device |
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| CN201811653065.0A CN109470130B (en) | 2018-12-29 | 2018-12-29 | Transmitting-receiving differential type eddy current displacement detection device |
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| CN109470130A CN109470130A (en) | 2019-03-15 |
| CN109470130B true CN109470130B (en) | 2024-02-27 |
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| CN110260773A (en) * | 2019-05-22 | 2019-09-20 | 北京清科电子有限责任公司 | A kind of preposition conditioning device of the current vortex sensor of Low Drift Temperature |
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| CN107064604A (en) * | 2017-05-10 | 2017-08-18 | 哈尔滨工业大学 | A kind of current sensor device based on magnetic field sensing |
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| CN209147918U (en) * | 2018-12-29 | 2019-07-23 | 长沙市开启时代电子有限公司 | It is a kind of to send a reception differential type current vortex displacement detection device |
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2018
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|---|---|---|---|---|
| EP0258468A1 (en) * | 1986-08-28 | 1988-03-09 | Vickers Systems GmbH | Inductive displacement sensing process and displacement sensor |
| US6498477B1 (en) * | 1999-03-19 | 2002-12-24 | Biosense, Inc. | Mutual crosstalk elimination in medical systems using radiator coils and magnetic fields |
| JP2004056163A (en) * | 2002-07-16 | 2004-02-19 | Oki Electric Ind Co Ltd | Amplifier circuit |
| CN1587894A (en) * | 2004-08-18 | 2005-03-02 | 浙江大学 | Temperature compensation method for electric eddy shift sensor |
| CN101233385A (en) * | 2005-07-29 | 2008-07-30 | 格尔德·赖梅 | Method and device for distance measurement by means of capacitive or inductive sensors |
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Effective date of registration: 20221215 Address after: 411100 No. 14, Liancheng Avenue, economic development zone, Xiangtan City, Hunan Province Applicant after: Hunan Kaikai Times Technology Co.,Ltd. Address before: 410205 Room 1401-1410, Headquarters Building of CEC Software Park, Jianshan Road, High tech Zone, Changsha City, Hunan Province Applicant before: CHANGSHA KAIQI SHIDAI ELECTRONIC Co.,Ltd. |
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