CN111121608B - Circuit for performing multistage correction on output linearity of eddy current sensor by using Schottky diode - Google Patents
Circuit for performing multistage correction on output linearity of eddy current sensor by using Schottky diode Download PDFInfo
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- CN111121608B CN111121608B CN201911359139.4A CN201911359139A CN111121608B CN 111121608 B CN111121608 B CN 111121608B CN 201911359139 A CN201911359139 A CN 201911359139A CN 111121608 B CN111121608 B CN 111121608B
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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
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Abstract
The invention provides a circuit for performing multistage correction on output linearity of an eddy current sensor by utilizing a Schottky diode, wherein an output signal of the eddy current sensor is rectified and filtered to be used as an input signal of the correction circuit, the correction circuit comprises a first resistor R1, a first operational amplifier U1A and a second operational amplifier U1B, one end of the first resistor R1 is connected with an output signal of the eddy current sensor after rectification and filtering, the other end of the first resistor R1 is connected with a pin 2 of the first operational amplifier U1A, a pin 1 of the first operational amplifier U1A is connected with one end of a seventeenth resistor R17, the other end of the seventeenth resistor R17 is connected with one end of a twentieth resistor R20 and is connected with a pin 6 of the second operational amplifier U1B, and a pin 7 of the second operational amplifier U1B is output to a post-stage circuit for processing through the twentieth resistor R22. The circuit has the advantages of simple structure, small volume, low cost and easy operation, and greatly improves the linearity of the eddy current sensor and expands the measurement range by the simplest and most effective scheme.
Description
Technical Field
The invention relates to the technical field of eddy current sensors, in particular to a circuit for performing multistage correction on the output linearity of an eddy current sensor by using a Schottky diode.
Background
The eddy current sensor is a non-contact measuring instrument and has been widely used for displacement measurement in various industries. In the displacement measurement scenario, the displacement distance from the object to be measured, as sensed by the induction coil and the oscillator, will be converted into a voltage signal. Within a certain displacement distance range, the voltage signal can change linearly along with the change of the displacement distance. However, after the displacement distance of the measured object exceeds a certain range, the induced voltage signal is not linear any more but is in a curve relation with the change of the displacement distance. When the displacement distance increases to a certain extent, the change of the voltage signal with the displacement distance will become non-linear in the far section of the measuring range of the sensor (as shown in fig. 2).
Disclosure of Invention
The invention aims to provide a circuit for performing multistage correction on the output linearity of an eddy current sensor by using a Schottky diode, which can effectively enlarge the linear measurement range of the eddy current sensor.
The technical scheme provided by the invention
A circuit for performing multi-stage correction on the output linearity of an eddy current sensor by using Schottky diodes, wherein the output signal of the eddy current sensor is rectified and filtered to be used as an input signal of a correction circuit, the correction circuit comprises a first resistor R1, a first operational amplifier U1A and a second operational amplifier U1B, the first operational amplifier U1A is powered by VCC1, one end of the first resistor R1 is connected with the rectified and filtered output signal of the eddy current sensor, the other end of the first resistor R1 is connected with the pin 2 of the first operational amplifier U1A, a first filter capacitor C1 is further connected between the first resistor R1 and the pin 2 of the first operational amplifier U1A, the pin 3 of the first operational amplifier U1A is connected with a voltage division circuit consisting of a thirteenth resistor R13 and a fourteenth resistor R14, one end of the thirteenth resistor R13 is grounded, the other end of the thirteenth resistor R14 is connected with a voltage division circuit, and the other end of the voltage division circuit VCC2 of the fourteenth resistor R14, one end of a fifteenth resistor R15 is connected with a pin 2 of a first operational amplifier U1A, the other end of the fifteenth resistor R15 is connected with one end of a sixteenth resistor R16 in series, the other end of the sixteenth resistor R16 is connected with a pin 1 of a first operational amplifier U1A in series, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and a first diode D1 are sequentially connected in series to form a series voltage division adjusting circuit, the series voltage division adjusting circuit is powered by VCC2, a second filter capacitor C2 is further connected between the second resistor R2 and the VCC2 of the series voltage division adjusting circuit, a third filter capacitor C3 is connected in parallel to the thirteenth resistor R13, one end of an eighth resistor R8 is connected between the second resistor R2 and the third resistor R3, the other end of the eighth resistor R8 is connected with the anode of the first Schottky diode D2 to form a 1 stage of the correcting circuit, one end of the first resistor R6867 is connected between the ninth resistor R36 9 2 and the fourth resistor R36, the other end of the resistor is connected with the anode of a second Schottky diode D3 to form the 2 nd stage of the correction circuit, one end of a tenth resistor R10 is connected between a fourth resistor R4 and a fifth resistor R5, the other end of the resistor is connected with the anode of a third Schottky diode D4 to form the 3 rd stage of the correction circuit, one end of an eleventh resistor R11 is connected between a fifth resistor R5 and a sixth resistor R6, the other end of the resistor R11 is connected with the anode of a fourth Schottky diode D5 to form the 4 th stage of the correction circuit, one end of a twelfth resistor R12 is connected between a sixth resistor R6 and a seventh resistor R7, the other end of the twelfth resistor R12 is connected with the anode of a fifth Schottky diode D6 to form the 5 th stage of the correction circuit, cathodes of the first schottky diode D2, the second schottky diode D3, the third schottky diode D4, the fourth schottky diode D5 and the fifth schottky diode D6 are connected together and connected between a fifteenth resistor R15 and a sixteenth resistor R16.
The pin 1 of the first operational amplifier U1A is connected to one end of a seventeenth resistor R17, the other end of the seventeenth resistor R17 is connected to one end of a twentieth resistor R20 and is connected to the pin 6 of the second operational amplifier U1B, the other end of the twentieth resistor R20 is connected to the center tap of the second variable resistor VR2, one end of the second variable resistor VR2 is connected to the twenty-first resistor R21, the other end of the twenty-first resistor R21 is grounded, the other end of the second variable resistor VR2 is connected to the pin 7 of the second operational amplifier U1B and is output to a post-stage circuit via the twenty-second resistor R22, the pin 5 of the second operational amplifier U1B is connected to the center tap of the first variable resistor VR1, one end of the first variable resistor VR1 is connected to the eighteenth resistor R18, the other end of the eighteenth resistor R18 is grounded, the other end of the first variable resistor VR1 is connected to the terminal VCC 19, and the other end of the nineteenth resistor R19 is connected to the nineteenth resistor R2, a fourth filter capacitor C4 is also connected between the pin 5 of the second operational amplifier U1B and the center tap of the first variable resistor VR 1.
The anode of the first diode D1 is connected with the seventh resistor R7, and the cathode of the first diode D1 is grounded.
The invention has the following advantages: the linearity of the eddy current sensor can be obviously corrected, and the measurement range is expanded. In addition, the circuit is small in size, simple in structure, low in cost and easy to operate.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention.
FIG. 2 is a linear plot of the output displacement of an unmodified eddy current sensor.
FIG. 3 is a linear graph of the output displacement of the eddy current sensor after being corrected by the circuit of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in FIG. 1, a circuit for performing multi-stage correction on the output linearity of an eddy current sensor by using Schottky diodes, the output signal of the eddy current sensor is rectified and filtered to be used as the input signal of the correction circuit, the correction circuit comprises a first resistor R1, a first operational amplifier U1A and a second operational amplifier U1B, the first operational amplifier U1A is powered by VCC1, one end of the first resistor R1 is connected with the rectified and filtered output signal of the eddy current sensor, the other end of the first resistor R1 is connected with the 2 pin of the first operational amplifier U1A, a first filter capacitor C1 is further connected between the first resistor R1 and the 2 pin of the first operational amplifier U1A, the 3 pin of the first operational amplifier U1A is connected with a voltage division circuit consisting of a thirteenth resistor R13 and a fourteenth resistor R14, one end of the thirteenth resistor R13 is connected with ground, another fourteenth resistor R14 and another VCC R2 of the fourteenth resistor R14, one end of a fifteenth resistor R15 is connected with a pin 2 of a first operational amplifier U1A, the other end of the fifteenth resistor R15 is connected with one end of a sixteenth resistor R16 in series, the other end of the sixteenth resistor R16 is connected with a pin 1 of a first operational amplifier U1A in series, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and a first diode D1 are sequentially connected in series to form a series voltage division adjusting circuit, the series voltage division adjusting circuit is powered by VCC2, a second filter capacitor C2 is further connected between the second resistor R2 and the VCC2 of the series voltage division adjusting circuit, a third filter capacitor C3 is connected in parallel to the thirteenth resistor R13, one end of an eighth resistor R8 is connected between the second resistor R2 and the third resistor R3, the other end of the eighth resistor R8 is connected with the anode of the first Schottky diode D2 to form a 1 stage of the correcting circuit, one end of the first resistor R6867 is connected between the ninth resistor R36 9 2 and the fourth resistor R36, the other end of the resistor is connected with the anode of a second Schottky diode D3 to form the 2 nd stage of the correction circuit, one end of a tenth resistor R10 is connected between a fourth resistor R4 and a fifth resistor R5, the other end of the resistor is connected with the anode of a third Schottky diode D4 to form the 3 rd stage of the correction circuit, one end of an eleventh resistor R11 is connected between a fifth resistor R5 and a sixth resistor R6, the other end of the resistor R11 is connected with the anode of a fourth Schottky diode D5 to form the 4 th stage of the correction circuit, one end of a twelfth resistor R12 is connected between a sixth resistor R6 and a seventh resistor R7, the other end of the twelfth resistor R12 is connected with the anode of a fifth Schottky diode D6 to form the 5 th stage of the correction circuit, cathodes of the first schottky diode D2, the second schottky diode D3, the third schottky diode D4, the fourth schottky diode D5 and the fifth schottky diode D6 are connected together and connected between a fifteenth resistor R15 and a sixteenth resistor R16.
The pin 1 of the first operational amplifier U1A is connected to one end of a seventeenth resistor R17, the other end of the seventeenth resistor R17 is connected to one end of a twentieth resistor R20 and is connected to the pin 6 of the second operational amplifier U1B, the other end of the twentieth resistor R20 is connected to the center tap of the second variable resistor VR2, one end of the second variable resistor VR2 is connected to the twenty-first resistor R21, the other end of the twenty-first resistor R21 is grounded, the other end of the second variable resistor VR2 is connected to the pin 7 of the second operational amplifier U1B and is output to a post-stage circuit via the twenty-second resistor R22, the pin 5 of the second operational amplifier U1B is connected to the center tap of the first variable resistor VR1, one end of the first variable resistor VR1 is connected to the eighteenth resistor R18, the other end of the eighteenth resistor R18 is grounded, the other end of the first variable resistor VR1 is connected to the terminal VCC 19, and the other end of the nineteenth resistor R19 is connected to the nineteenth resistor R2, a fourth filter capacitor C4 is also connected between the pin 5 of the second operational amplifier U1B and the center tap of the first variable resistor VR 1.
The anode of the first diode D1 is connected with the seventh resistor R7, and the cathode of the first diode D1 is grounded.
With the increase of the displacement distance of the eddy current displacement sensor, the input signal will continuously increase, the output voltage of the 1 pin will continuously decrease after being processed by the first operational amplifier U1A, and the fifteenth resistor R15 and the sixteenth resistor R16 are connected in series to form a feedback circuit. The fifteenth resistor R15 and the sixteenth resistor R16 are connected to the cathode of each schottky diode, where the voltage decreases with the increasing input voltage. The feedback value of each corresponding stage can be corrected by adjusting resistance parameters of the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7, setting a correction voltage starting point of each stage, and adjusting parameters of the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11 and the twelfth resistor R12.
The principle is that the voltage of the cathode terminal of the schottky diode continuously decreases with the continuous increase of the input voltage. When the voltage is lower than the tube voltage drop of the Schottky diode of the current level, the diode is conducted, the current circuit is connected into the feedback circuit, and otherwise, the diode is not connected into the feedback circuit when the diode is cut off. And the other stages of correction circuits are analogized. The feedback value is continuously increased step by step, namely the amplification factor is continuously increased, so as to correct the defect that the amplitude of the far-section signal is smaller. The number of stages of the correction circuit can be increased or decreased according to the actual output characteristic of the circuit.
Adjusting VR1 may change the voltage value at the start of the output. Adjusting VR2 may change the magnitude of the feedback value of the second operational amplifier U1B. Thus, the output amplification factor is changed, and the amplitude of the output amplification factor reaches an ideal output voltage value.
The technical scheme of the invention is applied to the linear multistage correction of the eddy current displacement sensor, and the nonlinear region of the far section of the eddy current is effectively corrected through the tube voltage drop of the Schottky diode, the unidirectional conduction of the diode and other characteristics. The circuit has the advantages of small volume, simple structure, easy operation and low cost. The method provides a simple and effective scheme for expanding the measuring range of the eddy current displacement sensor.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A circuit for performing multistage correction on the output linearity of an eddy current sensor by using Schottky diodes, wherein the output signal of the eddy current sensor is rectified and filtered to be used as an input signal of the correction circuit, the correction circuit is characterized by comprising a first resistor (R1), a first operational amplifier (U1A) and a second operational amplifier (U1B), the first operational amplifier (U1A) is powered by VCC1, one end of the first resistor (R1) is connected with the rectified and filtered output signal of the eddy current sensor, the other end of the first resistor (R1) is connected with a pin 2 of the first operational amplifier (U1A), a first filter capacitor (C1) is further connected between the first resistor (R1) and a pin 2 of the first operational amplifier (U1A), a pin 3 of the first operational amplifier (U1A) is connected with a voltage division circuit consisting of a thirteenth resistor (R13) and a fourteenth resistor (R14), one end of the thirteenth resistor (R13) is grounded, the other end of the thirteenth resistor (R13) is connected with a fourteenth resistor (R14), the other end of the fourteenth resistor (R14) is connected with VCC2, one end of the fifteenth resistor (R15) is connected with a pin 2 of the first operational amplifier (U1A), the other end of the fifteenth resistor (R15) is connected with one end of the sixteenth resistor (R16) in series, the other end of the sixteenth resistor (R16) is connected with a pin 1 of the first operational amplifier (U1A), the second resistor (R2), the third resistor (R3), the fourth resistor (R4), the fifth resistor (R5), the sixth resistor (R6), the seventh resistor (R7) and the first diode (D1) are sequentially connected in series to form a voltage division regulating circuit, the voltage division regulating circuit connected in series is powered by VCC2, a second filter capacitor (C5) is further connected between the second resistor (R2) and the VCC 2) of the series regulating circuit, and a third filter capacitor (C57324) are connected in parallel on the thirteenth resistor, an eighth resistor (R8) has one end connected between the second resistor (R2) and the third resistor (R3) and the other end connected to the anode of the first Schottky diode (D2) to form the 1 st stage of the correction circuit, a ninth resistor (R9) has one end connected between the third resistor (R3) and the fourth resistor (R4) and the other end connected to the anode of the second Schottky diode (D3) to form the 2 nd stage of the correction circuit, a tenth resistor (R10) has one end connected between the fourth resistor (R4) and the fifth resistor (R5) and the other end connected to the anode of the third Schottky diode (D4) to form the 3 rd stage of the correction circuit, an eleventh resistor (R11) has one end connected between the fifth resistor (R5) and the sixth resistor (R632) and the other end connected to the anode of the fourth Schottky diode (D5) to form the sixth stage of the correction circuit, a twelfth resistor (R634) and a seventh resistor (R7) are connected between the seventh stage of the correction circuit, the other end of the voltage regulator is connected with the anode of a fifth Schottky diode (D6) to form the 5 th stage of the correction circuit, and the cathodes of the first Schottky diode (D2), the second Schottky diode (D3), the third Schottky diode (D4), the fourth Schottky diode (D5) and the fifth Schottky diode (D6) are connected and are connected between a fifteenth resistor (R15) and a sixteenth resistor (R16).
2. The circuit of claim 1, wherein the circuit for performing multi-stage correction on the output linearity of the eddy current sensor by using the schottky diode is characterized in that: the pin 1 of the first operational amplifier (U1A) is connected with one end of a seventeenth resistor (R17), the other end of the seventeenth resistor (R17) is connected with one end of a twentieth resistor (R20) and is connected with the pin 6 of the second operational amplifier (U1B), the other end of the twentieth resistor (R20) is connected with a center tap of a second variable resistor (VR2), one end of a second variable resistor (VR2) is connected with a twenty-first resistor (R21), the other end of the twenty-first resistor (R21) is grounded, the other end of the second variable resistor (VR2) is connected with the pin 7 of the second operational amplifier (U1B) and is output to a post-stage circuit through the twenty-second resistor (R22), the pin 5 of the second operational amplifier (U1B) is connected with the center tap of the first variable resistor (VR1), one end of the first variable resistor (1) is connected with the pin eighteenth resistor (R18), and the other end of the eighteenth resistor (R18) is grounded, the other end of the first variable resistor (VR1) is connected with one end of a nineteenth resistor (R19), the other end of the nineteenth resistor (R19) is connected with a VCC2, and a fourth filter capacitor (C4) is connected between a pin 5 of the second operational amplifier (U1B) and a center tap of the first variable resistor (VR 1).
3. The circuit of claim 1, wherein the circuit for performing multi-stage correction on the output linearity of the eddy current sensor by using the schottky diode is characterized in that: the anode of the first diode (D1) is connected with the seventh resistor (R7), and the cathode of the first diode (D1) is grounded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911359139.4A CN111121608B (en) | 2019-12-25 | 2019-12-25 | Circuit for performing multistage correction on output linearity of eddy current sensor by using Schottky diode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911359139.4A CN111121608B (en) | 2019-12-25 | 2019-12-25 | Circuit for performing multistage correction on output linearity of eddy current sensor by using Schottky diode |
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| CN111121608B true CN111121608B (en) | 2021-03-26 |
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Citations (6)
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| US6046635A (en) * | 1998-04-08 | 2000-04-04 | Powerwave Technologies, Inc. | Dynamic predistortion compensation for a power amplifier |
| CN201302445Y (en) * | 2008-11-25 | 2009-09-02 | 罗福恒 | Novel linear correction circuit of electric eddy sensor |
| CN105423886A (en) * | 2015-11-25 | 2016-03-23 | 上海工程技术大学 | Direction discrimination unit for micro displacement data acquisition system |
| CN107483021A (en) * | 2017-08-15 | 2017-12-15 | 广州联星科技有限公司 | Analog predistortion power amplifier linearity circuit for rectifying, antidote and device |
| DE102016012089A1 (en) * | 2016-10-05 | 2018-04-05 | André Schleicher | Triple differential capacitive multi-axis distance measuring system |
| CN110260892A (en) * | 2018-03-12 | 2019-09-20 | 巴鲁夫有限责任公司 | Inductance type transducer and method for running inductance type transducer |
-
2019
- 2019-12-25 CN CN201911359139.4A patent/CN111121608B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6046635A (en) * | 1998-04-08 | 2000-04-04 | Powerwave Technologies, Inc. | Dynamic predistortion compensation for a power amplifier |
| CN201302445Y (en) * | 2008-11-25 | 2009-09-02 | 罗福恒 | Novel linear correction circuit of electric eddy sensor |
| CN105423886A (en) * | 2015-11-25 | 2016-03-23 | 上海工程技术大学 | Direction discrimination unit for micro displacement data acquisition system |
| DE102016012089A1 (en) * | 2016-10-05 | 2018-04-05 | André Schleicher | Triple differential capacitive multi-axis distance measuring system |
| CN107483021A (en) * | 2017-08-15 | 2017-12-15 | 广州联星科技有限公司 | Analog predistortion power amplifier linearity circuit for rectifying, antidote and device |
| CN110260892A (en) * | 2018-03-12 | 2019-09-20 | 巴鲁夫有限责任公司 | Inductance type transducer and method for running inductance type transducer |
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Denomination of invention: A circuit for multilevel correction of output linearity of eddy current sensor using Schottky diode Effective date of registration: 20230228 Granted publication date: 20210326 Pledgee: China CITIC Bank Co.,Ltd. Xiangyang Branch Pledgor: ZAOYANG MIRAN SCIENCE & TECHNOLOGY CO.,LTD. Registration number: Y2023980033559 |
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Address after: 441200 milang Industrial Park, 112 Jianshe West Road, Zaoyang City, Xiangyang City, Hubei Province Patentee after: Hubei Mirang Technology Co.,Ltd. Address before: 441200 milang Industrial Park, 112 Jianshe West Road, Zaoyang City, Xiangyang City, Hubei Province Patentee before: ZAOYANG MIRAN SCIENCE & TECHNOLOGY CO.,LTD. |
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