CN116772702A - Eddy current distance acquisition circuit - Google Patents
Eddy current distance acquisition circuit Download PDFInfo
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- CN116772702A CN116772702A CN202311073196.2A CN202311073196A CN116772702A CN 116772702 A CN116772702 A CN 116772702A CN 202311073196 A CN202311073196 A CN 202311073196A CN 116772702 A CN116772702 A CN 116772702A
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- 230000010355 oscillation Effects 0.000 claims abstract description 18
- 238000005070 sampling Methods 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims description 25
- 239000003990 capacitor Substances 0.000 claims description 12
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
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Abstract
The electric vortex distance acquisition circuit accurately detects the inductance change in the electric vortex sensor through the oscillation loop, converts the inductance change of the electric vortex sensor into a sampling range acceptable by a singlechip through the rectification loop and the signal modulation loop, can improve the sampling precision, and finally accurately calculates the braking distance of the brake through the singlechip; the circuit has the advantages of less number of elements and lower corresponding production cost.
Description
Technical Field
The invention relates to the technical field of crane braking, in particular to an eddy current distance acquisition circuit.
Background
As known, a crane brake is an important component in safe operation, and is mainly used for braking crane wheels, but because the crane is operated in an intermittent and repeated mode, starting and braking actions are frequent, the abrasion of brake pads is serious, braking torque is reduced when the crane is not replaced in time, and the braking distance is increased; the braking control of the crane is realized by means of a braking system, the braking system generally adopts an open-loop control mode, the main control computer cannot acquire the actual abrasion state of the brake in real time, and the braking distance of the brake is gradually prolonged along with the time, so that the longer the open-loop control mode is used for braking, the greater the potential safety hazard is;
therefore, at present, a closed-loop control braking system is mostly adopted, the braking system generally adopts a sensor to detect the braking capability of a brake, and commonly utilizes an electric vortex sensor to detect the wearing degree of a brake pad of the brake, or utilizes a torque sensor to detect the braking capability of the brake, but because the volume of a crane brake is usually larger, the torque sensor completes the detection of the braking capability through a mechanical structure, when the crane brake is used, the received torque is larger and is easy to damage, so the detection of the brake by utilizing the electric vortex sensor is the current mainstream;
chinese patent (202223127527. X) discloses a crane brake band-type brake gap detection device based on an eddy current sensor, which can monitor the band-type brake gap in real time, send out an alarm signal in time after abnormality occurs, remind related personnel to process, reduce accident occurrence and ensure safe operation of equipment; however, a specific signal acquisition method is not disclosed, and the effect achieved by using different methods for signal acquisition is different, and in addition, according to the application number: the electric vortex signal acquisition device of CN201711164376.6 adopts two sensors to obtain two processing results, the acquisition precision is improved by comparing the two processing results through a processor, and the external electromagnetic interference of signals in the transmission process is reduced through an isolation circuit; however, due to the adoption of more detection units, the cost of the acquisition device is higher, the electric signals output by the sensor are generally disordered, and if the processor directly receives the signals sent by the sensor, the situation of error of signal time can occur, so that the operation of a brake system is further influenced;
therefore, in view of the above, there is a need in the market for a low-cost acquisition circuit capable of accurately detecting the eddy current signal.
Disclosure of Invention
In order to overcome the defects in the background technology, the invention discloses an eddy current distance acquisition circuit.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
an eddy current distance acquisition circuit comprises a power supply loop, an oscillation loop, a rectification loop, a signal modulation loop, a singlechip and a data uploading loop;
the input end of the power supply loop is connected with an external power supply, and the output end of the power supply loop is respectively connected with the oscillation loop, the rectification loop, the signal modulation loop and the singlechip;
the oscillation loop is correspondingly connected with the eddy current sensor, and can convert the inductance change of the eddy current sensor into a regular sine wave;
the rectification loop can convert sine waves into direct current signals;
the signal modulation loop can adjust the direct current signal to be within the sampling range of the singlechip;
the singlechip is used for carrying out operation processing on the acquired data and converting the acquired data into a distance signal;
the data uploading loop can transmit the distance signal to the big data platform through the Ethernet interface unit.
Preferably, the power supply loop comprises an anti-reverse diode, an overvoltage protection unit, an isolation power supply unit and a linear voltage stabilizing unit which are sequentially connected in series; wherein the power supply reverse connection preventing diode unit can prevent internal components from being damaged due to reverse connection of an external power supply; the overvoltage protection unit can absorb external voltage surge and protect a circuit rear-end element; the isolation power supply unit can isolate an external power supply from an internal power supply, so that the interference of the external power supply to the oscillation loop and the singlechip is reduced; the linear voltage stabilizing unit can provide a stable power supply for the singlechip.
Preferably, the overvoltage protection unit is formed by connecting a piezoresistor ZR1, a TVS diode TVS1 and a TVS diode TVS2 in parallel.
Preferably, the oscillation loop comprises an operational amplifier U3, a triode Q1 and a peripheral circuit, wherein a signal input end IN-of the operational amplifier U3 is respectively connected with an eddy current sensor L4 and an emitter of the triode Q1, a signal input end IN+ of the operational amplifier U3 is respectively connected with an inductor L4 and a power supply loop, a signal output end of the operational amplifier is connected with a base electrode of the triode Q1, and a collector electrode of the triode Q1 is respectively connected with the eddy current sensor L1 and a rectifying circuit.
Preferably, the rectifying circuit includes a diode D3, a capacitor C11 and an operational amplifier U2, where an anode of the diode D3 is connected to an output end of the oscillating circuit, a cathode of the diode D3 is connected to the capacitor C11 and the operational amplifier U2, another end of the capacitor C11 is grounded, and an output end of the operational amplifier U2 is connected to the signal modulating circuit.
Preferably, the signal modulation loop comprises a data conversion chip U1, a voltage regulating resistor RM2, a pull-up resistor R02, a gain resistor R06 and a gain resistor R07, wherein the 11 th pin of the data conversion chip U1 is connected with the output end of the rectifying loop, the 15 th pin of the data conversion chip U1 is connected with the voltage regulating resistor RM1, the 16 th pin of the data conversion chip U1 is connected with the voltage regulating resistor RM2, the 4 th pin of the data conversion chip U1 is connected with the ground wire through the gain resistor R07, the 6 th pin and the 7 th pin of the data conversion chip U1 are connected with the gain resistor R06, the gain resistor R06 is connected with the gain resistor R07, the 10 th pin of the data conversion chip U1 is connected with the ground wire through the pull-up resistor R02, and the 8 th pin of the data conversion chip U1 is connected with the singlechip through the differential amplifying unit.
Preferably, the signal modulation circuit is used for adjusting zero output current of the direct current signal, and the zero output current meets the following conditions:
zero current:
；
output current:
；
wherein the gain factorThe method comprises the following steps:
。
preferably, the singlechip adopts STM32 series singlechip.
Preferably, the data uploading loop adopts an Ethernet interface unit and a USB interface unit of a W5500 chip, wherein the Ethernet interface unit is connected with a big data platform, and the USB interface unit is connected with a singlechip.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
according to the eddy current distance acquisition circuit disclosed by the invention, the inductance change in the eddy current sensor is accurately detected through the oscillation loop, the inductance change of the eddy current sensor is converted into the sampling range acceptable by the singlechip through the rectification loop and the signal modulation loop, the sampling precision can be improved, and finally, the braking distance of the brake is accurately calculated by the singlechip; the circuit has the advantages of less number of elements and lower corresponding production cost.
Drawings
FIG. 1 is a schematic diagram of a structure of the present invention;
FIG. 2 is a schematic diagram of the electrical principle of the power supply circuit;
FIG. 3 is a schematic diagram of the electrical principle of an oscillating circuit;
FIG. 4 is a schematic diagram of the electrical principle of the rectifying circuit;
FIG. 5 is a schematic diagram of the electrical principle of the signal modulation circuit;
fig. 6 is an electrical schematic diagram of a differential amplifying unit;
FIG. 7 is a schematic diagram of the electrical principle of a single-chip microcomputer;
FIG. 8 is a schematic diagram of the electrical principle of an Ethernet interface unit;
FIG. 9 is a schematic diagram of the electrical principle of the USB interface unit;
in the figure: 1. a power supply loop; 2. an oscillation loop; 3. a rectifying circuit; 4. a signal modulation circuit; 5. a single chip microcomputer; 6. and (5) a data uploading loop.
Detailed Description
In the description, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", etc., the drawings merely correspond to the drawings of the present invention, and in order to facilitate description of the present invention, it is not indicated or implied that the device or element referred to must have a specific azimuth:
the eddy current distance acquisition circuit comprises a power supply loop 1, an oscillation loop 2, a rectification loop 3, a signal modulation loop 4, a singlechip 5 and a data uploading loop 6, wherein the eddy current distance acquisition circuit is described with reference to figures 1-9;
the input end of the power supply loop 1 is connected with an external power supply, and the output end of the power supply loop 1 is respectively connected with the oscillating loop 2, the rectifying loop 3, the signal modulation loop 4 and the singlechip 5;
the oscillation loop 2 is correspondingly connected with the eddy current sensor, and can convert the inductance change of the eddy current sensor into a regular sine wave;
the rectifying circuit 3 is capable of converting a sine wave into a direct current signal;
the signal modulation loop 4 can adjust the direct current signal to be within the sampling range of the singlechip 5;
the singlechip 5 can perform operation processing on the acquired data and convert the acquired data into a distance signal;
the data upload loop 6 is capable of transmitting distance signals to a large data platform via an ethernet interface unit.
In embodiment 1, as shown in fig. 2, the power circuit 1 includes an anti-reverse diode, an overvoltage protection unit, an isolated power unit and a linear voltage stabilizing unit which are sequentially connected in series; wherein the power supply reverse connection preventing diode unit can prevent internal components from being damaged due to reverse connection of an external power supply; the overvoltage protection unit can absorb external voltage surge and protect a circuit rear-end element; the isolation power supply unit can isolate an external power supply from an internal power supply, so that the interference of the external power supply to the oscillation loop 2 and the singlechip 5 is reduced; the linear voltage stabilizing unit can provide a stable power supply for the singlechip 5, and in addition, the power circuit 1 is also provided with a capacitor C52, a capacitor C53 and an inductor L1 for filtering input signals, and an LDO linear voltage stabilizing power supply U11 for providing stable power supply for the rear end singlechip 5 and the chips.
In addition, the overvoltage protection unit is formed by connecting a piezoresistor ZR1, a TVS diode TVS1 and a TVS diode TVS2 in parallel.
IN embodiment 2, as shown IN fig. 3, the oscillation circuit 2 includes an operational amplifier U3, a triode Q1 and a peripheral circuit, wherein a signal input terminal IN-of the operational amplifier U3 is connected with an eddy current sensor L4 and an emitter of the triode Q1 respectively, a signal input terminal in+ of the operational amplifier U3 is connected with an inductor L4 and a power supply circuit 1 respectively, a signal output terminal of the operational amplifier is connected with a base of the triode Q1, and a collector of the triode Q1 is connected with the eddy current sensor L1 and a rectifying circuit respectively; IN the initial state, the output pin of the operational amplifier U3 is low because the IN+ voltage is smaller than IN-, at this moment, Q1 is conducted, the eddy current sensors L1 and L4 are charged, the current is gradually increased, the IN-pin voltage of the operational amplifier U3 is reduced, when the IN+ pin is larger than the IN-pin voltage, the OUT pin of the operational amplifier U3 outputs high level, the triode Q1 is cut off, at this moment, the eddy current sensors L1 and L4 are discharged, and a regular sine wave is generated IN a circulating way; in addition, when the distance between the eddy current sensor and the measured object is changed, the inductance value of the eddy current sensor is changed, so that the amplitude and the frequency of the sine wave signal are changed.
In embodiment 3, as shown in fig. 4, the rectifying circuit 3 includes a diode D3, a capacitor C11 and an operational amplifier U2, wherein an anode of the diode D3 is connected to an output end of the oscillating circuit 2, a cathode of the diode D3 is connected to the capacitor C11 and the operational amplifier U2, another end of the capacitor C11 is grounded, and an output end of the operational amplifier U2 is connected to the signal modulating circuit 4, wherein the diode D3 is capable of filtering a lower half wave of a sine wave signal; the capacitor C11 filters the rectified half-wave signal to generate a stable direct current signal, and the operational amplifier U2 zeroes and amplifies the signal to convert the original sine wave signal into a recognizable direct current signal.
In embodiment 4, as shown in fig. 5-6, the signal modulation circuit 4 includes a data conversion chip U1, a voltage regulation resistor RM2, a pull-up resistor R02, a gain resistor R06 and a gain resistor R07, where an 11 th pin of the data conversion chip U1 is connected to an output end of the rectification circuit 3, a 15 th pin of the data conversion chip U1 is connected to the voltage regulation resistor RM1, a 16 th pin of the data conversion chip U1 is connected to the voltage regulation resistor RM2, a 4 th pin of the data conversion chip U1 is connected to a ground wire through the gain resistor R07, a 6 th pin and a 7 th pin of the data conversion chip U1 are both connected to the gain resistor R06, and the gain resistor R06 is connected to the gain resistor R07, a 10 th pin of the data conversion chip U1 is connected to the ground wire through the pull-up resistor R02, and an 8 th pin of the data conversion chip U1 is connected to the single chip 5 through a differential amplifying unit, and the data conversion chip U1 can convert a voltage signal into a more stable 4-20 ma signal, increase anti-interference capability, and can provide a stable operation reference voltage for a back-end circuit at the same time; in addition, the differential amplification unit can convert 4-20 mA signals into 0.5-2.7V voltage signals, and the single chip microcomputer 5 can conveniently recognize the signals.
In addition, the signal modulation circuit 4 is used for adjusting the zero output current of the direct current signal, and the zero output current meets the following conditions:
zero current:
；
output current:
；
wherein the gain factorThe method comprises the following steps:
。
in particular, the singlechip 5 adopts STM32 series singlechip 5.
In the embodiment 5, as shown in fig. 8-9, the data uploading loop 6 adopts an ethernet interface unit and a USB interface unit of a W5500 chip, where the ethernet interface unit is connected with a big data platform, and the USB interface unit is connected with the single chip microcomputer 5;
the data of the singlechip 5 are transmitted to a W5500 chip through an SPI serial port, the W5500 packages and converts the data and sends the data to a big data platform, so that the data is monitored by a background;
the USB circuit is mainly used for updating the program of the singlechip 5, adopts CH340G as a USB interface chip and is provided with a configurable output interface, when the program starts to be downloaded, an RTS pin is set to be low level, a triode Q2 is conducted at the moment, and a singlechip 5BOOT0 pin is set to be high level; then the DTR pin is set to be high level, the triode Q1 is conducted at the moment, the singlechip 5RSET pin is set to be low level, and the reset state is entered; and then the DTR pin is set to be high level, the singlechip 5 can enter a BootLoader mode, and program downloading can be carried out through a serial port.
The invention has not been described in detail in the prior art, and it is apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (9)
1. An eddy current distance acquisition circuit is characterized in that: the device comprises a power supply loop (1), an oscillation loop (2), a rectification loop (3), a signal modulation loop (4), a singlechip (5) and a data uploading loop (6);
the input end of the power supply loop (1) is connected with an external power supply, and the output end of the power supply loop (1) is respectively connected with the oscillation loop (2), the rectification loop (3), the signal modulation loop (4) and the singlechip (5);
the oscillation loop (2) is correspondingly connected with the eddy current sensor, and can convert the inductance change of the eddy current sensor into a regular sine wave;
the rectification circuit (3) can convert sine waves into direct current signals;
the signal modulation loop (4) can adjust the direct current signal to be within the sampling range of the singlechip (5);
the singlechip (5) can perform operation processing on the acquired data and convert the acquired data into a distance signal;
the data uploading loop (6) can transmit the distance signal to the big data platform through the Ethernet interface unit.
2. The eddy current distance collecting circuit according to claim 1, wherein: the power supply loop (1) comprises an anti-reverse diode, an overvoltage protection unit, an isolated power supply unit and a linear voltage stabilizing unit which are sequentially connected in series; wherein the power supply reverse connection preventing diode unit can prevent internal components from being damaged due to reverse connection of an external power supply; the overvoltage protection unit can absorb external voltage surge and protect a circuit rear-end element; the isolation power supply unit can isolate an external power supply from an internal power supply, so that the interference of the external power supply to the oscillation loop (2) and the singlechip (5) is reduced; the linear voltage stabilizing unit can provide a stable power supply for the singlechip (5).
3. The eddy current distance collecting circuit according to claim 2, wherein: the overvoltage protection unit is formed by connecting a piezoresistor ZR1, a TVS diode TVS1 and a TVS diode TVS2 in parallel.
4. The eddy current distance collecting circuit according to claim 1, wherein: the oscillation loop (2) comprises an operational amplifier U3, a triode Q1 and a peripheral circuit, wherein a signal input end IN-of the operational amplifier U3 is respectively connected with an eddy current sensor L4 and an emitter of the triode Q1, a signal input end IN+ of the operational amplifier U3 is respectively connected with an inductor L4 and a power supply loop (1), a signal output end of the operational amplifier is connected with a base electrode of the triode Q1, and a collector electrode of the triode Q1 is respectively connected with the eddy current sensor L1 and a rectifying circuit.
5. The eddy current distance collecting circuit according to claim 1, wherein: the rectification circuit (3) comprises a diode D3, a capacitor C11 and an operational amplifier U2, wherein the anode of the diode D3 is connected with the output end of the oscillation circuit (2), the cathode of the diode D3 is respectively connected with the capacitor C11 and the operational amplifier U2, the other end of the capacitor C11 is grounded, and the output end of the operational amplifier U2 is connected with the signal modulation circuit (4).
6. The eddy current distance collecting circuit according to claim 1, wherein: the signal modulation loop (4) comprises a data conversion chip U1, a voltage regulating resistor RM2, a pull-up resistor R02, a gain resistor R06 and a gain resistor R07, wherein an 11 th pin of the data conversion chip U1 is connected with the output end of the rectification loop (3), a 15 th pin of the data conversion chip U1 is connected with the voltage regulating resistor RM1, a 16 th pin of the data conversion chip U1 is connected with the voltage regulating resistor RM2, a 4 th pin of the data conversion chip U1 is connected with a ground wire through the gain resistor R07, a 6 th pin and a 7 th pin of the data conversion chip U1 are both connected with the gain resistor R06, the gain resistor R06 is connected with the gain resistor R07, a 10 th pin of the data conversion chip U1 is connected with the ground wire through the pull-up resistor R02, and an 8 th pin of the data conversion chip U1 is connected with the singlechip (5) through a differential amplifying unit.
7. The eddy current distance collecting circuit according to claim 6, wherein: the signal modulation loop (4) is used for adjusting zero output current of the direct current signal, and the zero output current meets the following conditions:
zero current:
；
output current:
；
wherein the gain factorThe method comprises the following steps:
。
8. the eddy current distance collecting circuit according to claim 1, wherein: the singlechip (5) adopts STM32 series singlechip.
9. The eddy current distance collecting circuit according to claim 1, wherein: the data uploading loop (6) adopts an Ethernet interface unit and a USB interface unit of a W5500 chip, wherein the Ethernet interface unit is connected with a big data platform, and the USB interface unit is connected with the singlechip (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311073196.2A CN116772702A (en) | 2023-08-24 | 2023-08-24 | Eddy current distance acquisition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311073196.2A CN116772702A (en) | 2023-08-24 | 2023-08-24 | Eddy current distance acquisition circuit |
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| Publication Number | Publication Date |
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| CN116772702A true CN116772702A (en) | 2023-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311073196.2A Pending CN116772702A (en) | 2023-08-24 | 2023-08-24 | Eddy current distance acquisition circuit |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001056203A (en) * | 1999-08-18 | 2001-02-27 | Japan Atom Energy Res Inst | Non-contact displacement measuring device |
| CN101126622A (en) * | 2007-09-25 | 2008-02-20 | 深圳东方锅炉控制有限公司 | High temperature non-contact type eddy current displacement sensor |
| CN204535644U (en) * | 2015-05-11 | 2015-08-05 | 肖思宇 | Based on the displacement measurement system of differential transformer transducer |
| CN106225657A (en) * | 2016-08-12 | 2016-12-14 | 安徽容知日新科技股份有限公司 | Displacement transducer |
| CN106969698A (en) * | 2017-06-02 | 2017-07-21 | 深圳怡化电脑股份有限公司 | A kind of electric vortex sensor measuring circuit and current vortex sensor |
| CN111059994A (en) * | 2018-10-16 | 2020-04-24 | 纳博特斯克有限公司 | Displacement sensor |
| CN212567265U (en) * | 2020-08-05 | 2021-02-19 | 深圳市森瑟科技发展有限公司 | Direct current voltage output demodulation circuit of eddy current displacement sensor |
| CN113358015A (en) * | 2021-04-16 | 2021-09-07 | 上海兰宝传感科技股份有限公司 | Eddy current displacement sensor and method for expanding linear range thereof |
| CN218539123U (en) * | 2022-11-24 | 2023-02-28 | 河南卫华重型机械股份有限公司 | Crane brake band-type brake gap detection device based on eddy current sensor |
| CN218619979U (en) * | 2022-11-24 | 2023-03-14 | 河南卫华重型机械股份有限公司 | High-precision eddy current detection circuit |
-
2023
- 2023-08-24 CN CN202311073196.2A patent/CN116772702A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001056203A (en) * | 1999-08-18 | 2001-02-27 | Japan Atom Energy Res Inst | Non-contact displacement measuring device |
| CN101126622A (en) * | 2007-09-25 | 2008-02-20 | 深圳东方锅炉控制有限公司 | High temperature non-contact type eddy current displacement sensor |
| CN204535644U (en) * | 2015-05-11 | 2015-08-05 | 肖思宇 | Based on the displacement measurement system of differential transformer transducer |
| CN106225657A (en) * | 2016-08-12 | 2016-12-14 | 安徽容知日新科技股份有限公司 | Displacement transducer |
| CN106969698A (en) * | 2017-06-02 | 2017-07-21 | 深圳怡化电脑股份有限公司 | A kind of electric vortex sensor measuring circuit and current vortex sensor |
| CN111059994A (en) * | 2018-10-16 | 2020-04-24 | 纳博特斯克有限公司 | Displacement sensor |
| CN212567265U (en) * | 2020-08-05 | 2021-02-19 | 深圳市森瑟科技发展有限公司 | Direct current voltage output demodulation circuit of eddy current displacement sensor |
| CN113358015A (en) * | 2021-04-16 | 2021-09-07 | 上海兰宝传感科技股份有限公司 | Eddy current displacement sensor and method for expanding linear range thereof |
| CN218539123U (en) * | 2022-11-24 | 2023-02-28 | 河南卫华重型机械股份有限公司 | Crane brake band-type brake gap detection device based on eddy current sensor |
| CN218619979U (en) * | 2022-11-24 | 2023-03-14 | 河南卫华重型机械股份有限公司 | High-precision eddy current detection circuit |
Non-Patent Citations (2)
| Title |
|---|
| 危水根 等: "《电子技术实践指导书》", vol. 1, 北京航空航天大学出版社, pages: 166 - 170 * |
| 张尚坤;: "新型位移电涡流传感器设计", 现代电子技术, no. 08 * |
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Application publication date: 20230919 |