CN210894727U - Receiving coil resonance device of probe in metal detector - Google Patents
Receiving coil resonance device of probe in metal detector Download PDFInfo
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- CN210894727U CN210894727U CN201921987728.2U CN201921987728U CN210894727U CN 210894727 U CN210894727 U CN 210894727U CN 201921987728 U CN201921987728 U CN 201921987728U CN 210894727 U CN210894727 U CN 210894727U
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- resonance
- receiving coil
- inductor
- tuning capacitor
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Abstract
The utility model discloses a receiving coil resonance device of a probe in a metal detector, which comprises a receiving coil, a coupling inductor, a resonance coarse tuning capacitor, a resonance fine tuning capacitor and an oscilloscope; the receiving coil is composed of two groups of coils, the receiving coil is connected with a coupling inductor and an oscilloscope through a circuit, the coupling inductor and a resonance inductor are coupled through a magnetic pole to form a component, the resonance inductor is connected with a resonance coarse tuning capacitor and a resonance fine tuning capacitor in parallel, and the resonance inductor, the resonance coarse tuning capacitor and the resonance fine tuning capacitor form a resonance circuit. The utility model discloses an advantage lies in: according to the total inductance values of the receiving coil and the coupling inductor, the capacity of the resonance capacitor is theoretically calculated by utilizing the turn ratio relation of the coupling coil and the resonance inductor, the voltage value of the receiving coil is observed through an oscilloscope, and the resonance capacitor in the resonance device of the receiving coil can be quickly and accurately finished.
Description
Technical Field
The utility model relates to a metal detection field, especially resonance device, this ratio technique will obtain the wide application in the metal detection instrument.
Background
The metal detector is an automatic instrument for detecting metal impurities, and is widely applied to the fields of military affairs, security inspection, archaeology, food, pharmacy and the like. Although resonant capacitance can be selectively allocated by using the capacitor box, the capacitor box itself has an error such as a line capacitance of a line length of the capacitor box, and the capacitance in the capacitor box itself has an error. However, the receiving coil resonance device of the probe in the existing metal detector has the problems of large matching difficulty, weak precision of resonance capacitance, failure to reach the maximum value of resonance voltage and the like, and the detection sensitivity of the metal detector is influenced. The patent combines theory and practice, and can rapidly and accurately match the capacitance.
Disclosure of Invention
An object of the utility model is to provide a receiving coil resonance device technique of probe in the metal detection instrument to the not enough of receiving coil resonance device existence of probe in the current metal detection instrument.
The technical scheme of the utility model is that: a receiving coil resonance device of a probe in a metal detector comprises a receiving coil, a coupling inductor, a resonance coarse tuning capacitor, a resonance fine tuning capacitor and an oscilloscope; the receiving coil is composed of two groups of coils, the receiving coil is connected with a coupling inductor and an oscilloscope through a circuit, the coupling inductor and a resonance inductor are coupled through a magnetic pole to form a component, the resonance inductor is connected with a resonance coarse tuning capacitor and a resonance fine tuning capacitor in parallel, and the resonance inductor, the resonance coarse tuning capacitor and the resonance fine tuning capacitor form a resonance circuit.
The wire diameter of the receiving coil is 1.0-2.5 mm.
The two sets of coils in the receiving coil are of opposite polarity.
The turn ratio of the coupling inductor to the resonance inductor is 2: 40-2: 80.
The resonance circuit is formed by connecting the resonance inductor, the resonance coarse adjustment capacitor and the resonance fine adjustment capacitor in parallel, and the resonance frequency of the resonance circuit is the transmission frequency of the probe.
The ratio of the resonance coarse tuning capacitor to the resonance fine tuning capacitor is that the capacity of the resonance coarse tuning capacitor is roughly calculated by calculating the relation between the probe transmitting frequency and the resonance inductance, then the resonance fine tuning capacitor is connected in parallel at two ends of the resonance coarse tuning capacitor, the maximum value of the resonance voltage is observed by an oscilloscope to be unchanged, and finally the capacities of the resonance coarse tuning capacitor and the resonance fine tuning capacitor are determined to complete the ratio of the capacitors.
The utility model has the advantages that: firstly, the value of the resonance capacitor is calculated roughly by using a theoretical calculation formula, and then the coarse tuning capacitor is selected, so that the time and steps of manual searching can be greatly simplified, and the proportion of the coarse tuning capacitor is completed; secondly, connecting a small-capacity capacitor in parallel with the coarse tuning capacitor, and observing whether the resonance voltage on the receiving coil reaches the maximum value by using an oscilloscope to finish the matching of the fine tuning capacitor; and thirdly, the resonance capacitance values obtained by coarse adjustment and fine adjustment are welded beside the resonance inductor, so that the parasitic capacitance of the circuit board is reduced. The matching technology of the resonant capacitor has important application value in a metal detector.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention;
in the figure: 1-receiving coil, 2-coupling inductor, 3-resonance inductor, 4-resonance coarse tuning capacitor, 5-resonance fine tuning capacitor and 6-oscilloscope.
Detailed Description
The invention will be further described with reference to the following figures and examples:
example 1: see fig. 1.
A receiving coil resonance device of a probe in a metal detector comprises a receiving coil 1, a coupling inductor 2, a resonance inductor 3, a resonance coarse tuning capacitor 4, a resonance fine tuning capacitor 5 and an oscilloscope 6. The proportioning technology is as follows: firstly, calculating a resonance capacitance value by using an LC oscillation resonance theory formula, and selecting a capacitance with the same capacity as the theoretically calculated capacitance, namely a coarse tuning capacitance. And secondly, connecting the oscilloscope to the receiving coil, observing the resonance voltage value of the receiving coil, and considering the influence of various factors, wherein the resonance voltage value is about 0.85 time of the power supply voltage. And thirdly, connecting a capacitor with the capacitance value of 50pF in parallel at two ends of the coarse tuning capacitor, observing whether the voltage at two ends of the resonance coil is increased or not through an oscilloscope, if so, continuously changing the capacitor with the larger value, observing that the voltage value at two ends of the resonance coil is close to the power supply voltage through the oscilloscope, and completing the proportioning of the fine tuning capacitor. And finally, the total capacitance values of the coarse tuning capacitor and the fine tuning capacitor are converted into capacitors with the same capacitance values, and then the resonant capacitors are welded at two ends of the resonant inductance coil, so that the capacitance of the parasitic circuit board is reduced, and the matching of the resonant capacitors is completed.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.
The embodiments disclosed above are illustrative and not exclusive in all respects, and all changes that come within the scope of the invention or that come within the range of equivalency of the invention are intended to be embraced therein.
Claims (5)
1. A receiving coil resonance device of a probe in a metal detector is characterized in that: the resonance device comprises a receiving coil (1), a coupling inductor (2), a resonance inductor (3), a resonance coarse tuning capacitor (4), a resonance fine tuning capacitor (5) and an oscilloscope (6); the receiving coil (1) is composed of two groups of coils, the receiving coil (1) is connected with a coupling inductor (2) and an oscilloscope (6) through a circuit, the coupling inductor (2) and a resonance inductor (3) are coupled through magnetic poles to form a component, the resonance inductor (3) is connected with a resonance coarse tuning capacitor (4) and a resonance fine tuning capacitor (5) in parallel, and the resonance inductor (3), the resonance coarse tuning capacitor (4) and the resonance fine tuning capacitor (5) form a resonance circuit.
2. The metal detector as claimed in claim 1, wherein the receiving coil resonance device of the probe head comprises: the wire diameter of the receiving coil (1) is 1.0-2.5 mm.
3. The metal detector as claimed in claim 1, wherein the receiving coil resonance device of the probe head comprises: the two groups of coils in the receiving coil (1) have opposite polarities.
4. The metal detector as claimed in claim 1, wherein the receiving coil resonance device of the probe head comprises: the turn ratio of the coupling inductor (2) to the resonance inductor (3) is 2: 40-2: 80.
5. The metal detector as claimed in claim 1, wherein the receiving coil resonance device of the probe head comprises: the resonance circuit is formed by connecting the resonance inductor (3), the resonance coarse tuning capacitor (4) and the resonance fine tuning capacitor (5) in parallel, and the resonance frequency is the transmission frequency of the probe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921987728.2U CN210894727U (en) | 2019-11-18 | 2019-11-18 | Receiving coil resonance device of probe in metal detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921987728.2U CN210894727U (en) | 2019-11-18 | 2019-11-18 | Receiving coil resonance device of probe in metal detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210894727U true CN210894727U (en) | 2020-06-30 |
Family
ID=71340780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921987728.2U Expired - Fee Related CN210894727U (en) | 2019-11-18 | 2019-11-18 | Receiving coil resonance device of probe in metal detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210894727U (en) |
-
2019
- 2019-11-18 CN CN201921987728.2U patent/CN210894727U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200630 Termination date: 20201118 |