CN213301094U - Inductive coil eddy current thickness measuring sensor - Google Patents
Inductive coil eddy current thickness measuring sensor Download PDFInfo
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- CN213301094U CN213301094U CN202022542878.1U CN202022542878U CN213301094U CN 213301094 U CN213301094 U CN 213301094U CN 202022542878 U CN202022542878 U CN 202022542878U CN 213301094 U CN213301094 U CN 213301094U
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Abstract
The utility model provides an inductance coil vortex thickness measurement sensor, including vortex induction coil, still include high accuracy reference voltage, electric capacity and vortex induction coil constitute LC oscillating circuit, high accuracy reference voltage produce through high accuracy reference voltage circuit by working power supply VCC, add the oscillating signal output that produces stable frequency on the LC oscillating circuit. The utility model discloses in, merge LC oscillating circuit with eddy current induction coil to add high accuracy reference voltage, stabilize signal frequency, the circuit is simple, signal frequency is wide, is suitable for measuring metal surface's powder, paint, electrophoresis, enamel, anticorrosive coating, and the plastic-blasting, thickness such as coating.
Description
Technical Field
The utility model relates to a thickness measurement sensor field, especially a measure the inductance coil vortex thickness measurement sensor of thickness such as powder, paint, electrophoresis, enamel, anticorrosive coating, spraying plastics, coating of metal surface.
Background
The eddy current thickness measuring sensor of the induction coil generates different eddy current effects by utilizing different distances between the coil and metal, so that different inductance values of the coil are changed. The device is mainly used for detecting the thickness (distance) of a coating on a metal surface, such as powder, paint, electrophoresis, enamel, an anticorrosive coating, plastic spraying, coating and the like on the metal surface.
The utility model discloses chinese utility model discloses an authorization bulletin number CN 204129828U discloses a financial equipment is with paper currency thickness measurement eddy current sensor, this kind of financial equipment is with paper currency thickness measurement eddy current sensor including establishing inductance and the electric capacity on the printing board, inductance and electric capacity parallel connection constitute oscillating circuit, the inductance for directly printing the copper foil coil at the printing board, the printing board have the M layer, be equipped with the copper foil coil of an n circle on every layer of printing board, the upper and lower position of the copper foil coil on the M layer of printing board is corresponding, the copper foil coil on the M layer of printing board is series connection in proper order and constitutes the inductance.
The paper money thickness measuring eddy current sensor for the melting equipment has low resolution due to wide signal range and narrow signal range. The signal stability is greatly influenced by temperature, humidity and the like, and the real-time response is slow, the signal linearity is poor and the algorithm is complex. It is not suitable for measuring the thickness of powder, paint, electrophoresis, enamel, anticorrosive coating, plastic spraying, coating, etc. on the surface of metal.
SUMMERY OF THE UTILITY MODEL
The utility model discloses because the signal wide range is narrow, distinguish low according to such paper currency thickness measurement eddy current sensor for melting equipment at present. The signal stability is greatly influenced by temperature, humidity and the like, and the real-time response is slow, the signal linearity is poor and the algorithm is complex. It is not suitable for measuring the thickness of powder, paint, electrophoresis, enamel, anticorrosive coating, plastic spraying, coating, etc. on the surface of metal. An eddy current thickness measuring sensor for an induction coil is provided.
The utility model discloses a technical scheme who adopts for realizing above technical requirement is: the utility model provides an inductance coil vortex thickness measurement sensor, includes eddy current induction coil, still includes high accuracy reference voltage, electric capacity and eddy current induction coil constitute LC oscillating circuit, high accuracy reference voltage produce through high accuracy reference voltage circuit by working power VCC, add the oscillating signal output that produces stable frequency on the LC oscillating circuit.
Further, in the above-mentioned inductor eddy current thickness measuring sensor: the high-precision reference voltage circuit comprises a three-end precision voltage-stabilized power supply Q1, a diode D1, a triode Q2, a capacitor C3, a resistor R1, a resistor R2 and a resistor R4; the working power supply VCC is grounded through a resistor R1, a K end and an A end of a three-end precision voltage-stabilized power supply Q1, a P end and an N end of a diode D1 in sequence; the K end of the three-end precision voltage-stabilized power supply Q1 is grounded through a capacitor C3, the Vref end of the three-end precision voltage-stabilized power supply Q1 is connected with the K end and is connected with the base electrode of a triode Q2, the collector electrode of the triode Q2 is connected with a working power supply through a resistor R2, the emitter electrode is grounded through a resistor R4, and high-precision reference voltage is formed between the collector electrode and the emitter electrode of the triode Q2.
Further, in the above-mentioned inductor eddy current thickness measuring sensor: the LC oscillating circuit comprises a capacitor C5, a capacitor C4, a capacitor C6 and the eddy current induction coil L1; capacitor C5 is disposed between the collector and emitter of transistor Q2, capacitor C4 is disposed between the emitter of transistor Q2 and ground, and capacitor C6 is connected in series with eddy current inductor L1 and then connected between the collector of transistor Q2 and ground.
Further, in the above-mentioned inductor eddy current thickness measuring sensor: the circuit also comprises an oscillation signal output amplifying circuit, wherein the oscillation signal output signal comprises a triode Q3, a capacitor C7, a resistor R5 and a resistor R6; the output of the LC oscillating circuit is coupled by a capacitor C7 and then is added to the base of a triode Q3, the base of the triode Q3 is also connected with a working power supply VCC through a resistor R5, and the working power supply VCC is connected with the collector of the triode Q3.
The utility model discloses in, merge LC oscillating circuit with the coil to add high accuracy reference voltage, stabilize signal frequency, the circuit is simple, signal frequency is wide, is suitable for powder, paint, electrophoresis, enamel, the anticorrosive coating of measuring metal surface, and the plastic-blasting, thickness such as coating.
The present invention will be further described with reference to the accompanying drawings and the detailed description.
Drawings
Figure 1 is the utility model discloses inductance coil vortex thickness measurement sensor structure block diagram.
Figure 2 is the utility model discloses inductance coil vortex thickness measurement sensor circuit diagram.
Detailed Description
Example 1, as shown in fig. 1 and 2: the embodiment is an inductive coil eddy current thickness measuring sensor suitable for measuring the thicknesses of powder, paint, electrophoresis, enamel, anticorrosive coatings, plastic spraying, coatings and the like on the surface of metal. The high-precision reference voltage is generated by a working power supply VCC through a high-precision reference voltage circuit and is added to the LC oscillating circuit to generate an oscillating signal with stable frequency for output.
The circuit diagram is shown in fig. 2, wherein the high-precision reference voltage circuit comprises a three-terminal precision voltage-stabilized power supply Q1, a diode D1, a triode Q2, a capacitor C3, a resistor R1, a resistor R2 and a resistor R4; the working power supply VCC is grounded through a resistor R1, a K end and an A end of a three-end precision voltage-stabilized power supply Q1, a P end and an N end of a diode D1 in sequence; in this embodiment, the operating power VCC is also grounded through the capacitor C1 for filtering, and the capacitor C1 is grounded for filtering the ac component in the power. The K end of the three-end precision voltage-stabilized power supply Q1 is grounded through a capacitor C3, the Vref end of the three-end precision voltage-stabilized power supply Q1 is connected with the K end and is connected with the base electrode of a triode Q2, the collector electrode of the triode Q2 is connected with a working power supply through a resistor R2, the emitter electrode is grounded through a resistor R4, and high-precision reference voltage is formed between the collector electrode and the emitter electrode of the triode Q2. In the embodiment, the LC oscillating circuit comprises a capacitor C5, a capacitor C4, a capacitor C6 and the eddy current induction coil L1; capacitor C5 is disposed between the collector and emitter of transistor Q2, capacitor C4 is disposed between the emitter of transistor Q2 and ground, and capacitor C6 is connected in series with eddy current inductor L1 and then connected between the collector of transistor Q2 and ground. The circuit also comprises an oscillation signal output amplifying circuit, wherein the oscillation signal output signal comprises a triode Q3, a capacitor C7, a resistor R5 and a resistor R6; the output of the LC oscillating circuit is coupled by a capacitor C7 and then is added to the base of a triode Q3, the base of the triode Q3 is also connected with a working power supply VCC through a resistor R5, and the working power supply VCC is connected with the collector of the triode Q3.
Description of the circuit of the inductor eddy current thickness measuring sensor of the present embodiment:
an LC oscillating circuit is formed by a triode Q2, a capacitor C4, a capacitor C5 and a C6 inductor L1, a three-terminal precision voltage-stabilized power supply Q1 is a CJ432 chip, a diode D1 provides proper high-precision reference voltage for a base electrode (point B) of the triode Q2, and the voltage drop of an emitter is 0.7V, so that the voltage of the point e of the triode Q2 is equal to the voltage of the point B minus the voltage drop of the emitter by 0.7V, and therefore high-precision static working voltage is obtained at the point e, the current Ie is Ue/R4, the current Ie reaches a constant current and the current Ic reaches the constant current (Ie-Ic), the LC oscillating frequency is stabilized after the high-precision static working point is obtained by the Q2 triode, and the LC oscillating frequency is coupled through the C7 to be amplified and output to a next-stage triode Q3.
The thickness measurement principle is realized for the induction coil eddy current thickness measurement sensor of the embodiment:
when the sensor is close to metal, the coil can generate an eddy current effect, so that the inductance is changed, the frequency of the LC oscillating circuit is also changed by the inductance change, and the closer the distance between the coil and the metal, the larger the eddy current effect is, the larger the inductance change is, and the larger the frequency is. And measuring the distance between the coil and the metal through the frequency change, and finally measuring the thickness (distance) of the metal surface coating.
Claims (4)
1. The utility model provides an inductance coil eddy current thickness measurement sensor, includes eddy current induction coil, its characterized in that: still include high accuracy reference voltage, electric capacity and eddy current induction coil constitute LC oscillating circuit, high accuracy reference voltage produce through high accuracy reference voltage circuit by working power VCC, add to the oscillation signal output that produces stable frequency on the LC oscillating circuit.
2. The inductive coil eddy current thickness gauge sensor of claim 1, wherein: the high-precision reference voltage circuit comprises a three-end precision voltage-stabilized power supply Q1, a diode D1, a triode Q2, a capacitor C3, a resistor R1, a resistor R2 and a resistor R4; the working power supply VCC is grounded through a resistor R1, a K end and an A end of a three-end precision voltage-stabilized power supply Q1, a P end and an N end of a diode D1 in sequence; the K end of the three-end precision voltage-stabilized power supply Q1 is grounded through a capacitor C3, the Vref end of the three-end precision voltage-stabilized power supply Q1 is connected with the K end and is connected with the base electrode of a triode Q2, the collector electrode of the triode Q2 is connected with a working power supply through a resistor R2, the emitter electrode is grounded through a resistor R4, and high-precision reference voltage is formed between the collector electrode and the emitter electrode of the triode Q2.
3. The inductive coil eddy current thickness gauge sensor of claim 2, wherein: the LC oscillating circuit comprises a capacitor C5, a capacitor C4, a capacitor C6 and the eddy current induction coil L1; capacitor C5 is disposed between the collector and emitter of transistor Q2, capacitor C4 is disposed between the emitter of transistor Q2 and ground, and capacitor C6 is connected in series with eddy current inductor L1 and then connected between the collector of transistor Q2 and ground.
4. The inductive coil eddy current thickness gauge sensor of claim 3, wherein: the circuit also comprises an oscillation signal output amplifying circuit, wherein the oscillation signal output amplifying circuit comprises a triode Q3, a capacitor C7, a resistor R5 and a resistor R6; the output of the LC oscillating circuit is coupled by a capacitor C7 and then is added to the base of a triode Q3, the base of the triode Q3 is also connected with a working power supply VCC through a resistor R5, and the working power supply VCC is connected with the collector of the triode Q3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022542878.1U CN213301094U (en) | 2020-11-05 | 2020-11-05 | Inductive coil eddy current thickness measuring sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022542878.1U CN213301094U (en) | 2020-11-05 | 2020-11-05 | Inductive coil eddy current thickness measuring sensor |
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| Publication Number | Publication Date |
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| CN213301094U true CN213301094U (en) | 2021-05-28 |
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| CN202022542878.1U Active CN213301094U (en) | 2020-11-05 | 2020-11-05 | Inductive coil eddy current thickness measuring sensor |
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Address after: 511400 Room C-508, fifth floor, No. 1 (plant 3), Yuhong Street, Zhongcun Street, Panyu District, Guangzhou, Guangdong Patentee after: GUANGZHOU EAST CONFUCIANISM ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: Room 1030, No. 2, Ruifeng Third Street, Huangpu District, Guangzhou, Guangdong 510000 Patentee before: GUANGZHOU EAST CONFUCIANISM ELECTRONIC TECHNOLOGY Co.,Ltd. |