CN217034284U - Detector for underground metal detection - Google Patents
Detector for underground metal detection Download PDFInfo
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- CN217034284U CN217034284U CN202123380671.XU CN202123380671U CN217034284U CN 217034284 U CN217034284 U CN 217034284U CN 202123380671 U CN202123380671 U CN 202123380671U CN 217034284 U CN217034284 U CN 217034284U
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Abstract
The utility model relates to the technical field of metal detection, in particular to a detector for underground metal detection, which comprises a single chip microcomputer, wherein the signal output end of the single chip microcomputer is connected with a transmitting vibrator, the signal output end of the transmitting vibrator is connected with an electromagnetic transmitting coil, and the signal output end of the electromagnetic transmitting coil is connected with a voltage sampling feedback module; the signal output end of the singlechip is also connected with a program-controlled frequency-selecting filter, the signal input end of the program-controlled frequency-selecting filter is connected with a front-end program-controlled amplifier, and the signal input end of the front-end program-controlled amplifier is connected with a receiving coil; the signal output end of the program-controlled frequency-selecting filter is connected with a rear-end amplifier, the signal output end of the rear-end amplifier is connected with an audio amplifier, and the signal output end of the audio amplifier is connected with a loudspeaker; the signal output end of the rear-end amplifier is also connected with a multi-path A/D detection multiplexing module. The utility model can adjust the gain of the front-end program control amplifier through the singlechip, prevent signal distortion, improve detection precision and facilitate debugging.
Description
Technical Field
The utility model relates to the technical field of metal detection, in particular to a detector for underground metal detection.
Background
At present, the existing underground metal detector consists of a transmitting oscillator, a transmitting coil, a receiving coil, a phase shifter, a front-end receiving amplifier, a band-pass filter, a synchronous demodulator, a rear-end amplifier, a loudspeaker and an instrument panel. The front end receiving amplifier is designed as a fixed high-gain closed-loop amplifying circuit, the gain of the rear operational amplifier cannot be set too high to prevent the signal distortion which is amplified again, and even then, the situation that the signal distortion cannot be avoided, for example, when a metal detector detects metal on a shallow surface layer or large metal with high conductivity, the waveform of the detected signal is often distorted due to the fact that the original feedback signal is larger and is amplified by high gain, which is very unfavorable for carrying out characteristic analysis on the detected metal, meanwhile, the traditional metal detector only uses a transmitting coil signal as a phase-shifting reference on hardware and does not carry out A/D acquisition and software analysis, the excited influence of a transmitting coil on some metal or a certain detection point of a coil area is very large, but the excited influence of a receiving coil is very weak, and the detection performance of the detector is influenced under the situation, meanwhile, the phase shifter and the synchronous demodulator adopted in the existing detector are complex to debug and inconvenient to use. In view of this, we propose a detector for underground metal detection.
SUMMERY OF THE UTILITY MODEL
It is an object of the present invention to provide a detector for underground metal detection that solves the problems set forth in the background above.
In order to achieve the purpose, the utility model provides the following technical scheme:
a detector for underground metal detection comprises a single chip microcomputer, wherein a signal output end of the single chip microcomputer is connected with a transmitting vibrator, a signal output end of the transmitting vibrator is connected with an electromagnetic transmitting coil, and a signal output end of the electromagnetic transmitting coil is connected with a voltage sampling feedback module;
the signal output end of the single chip microcomputer is also connected with a program control frequency-selecting filter, the signal input end of the program control frequency-selecting filter is connected with a front-end program control amplifier, and the signal input end of the front-end program control amplifier is connected with a receiving coil;
the signal output end of the program-controlled frequency-selecting filter is connected with a rear-end amplifier, the signal output end of the rear-end amplifier is connected with an audio amplifier, and the signal output end of the audio amplifier is connected with a loudspeaker;
the signal output end of the rear-end amplifier is also connected with a multi-path A/D detection multiplexing module;
the single chip microcomputer collects the output signal of the rear-end amplifier through the multi-path A/D detection multiplexing module and controls the gain of the front-end programmable amplifier through the output signal of the rear-end amplifier;
the single chip microcomputer collects the output signal of the voltage sampling feedback module through the multi-path A/D detection multiplexing module, and identifies the attribute of the detected metal through comparing the output signal of the voltage sampling feedback module with the signal received by the receiving coil during detection.
Preferably, the lithium battery is further included and used for supplying power to the single chip microcomputer.
Preferably, the lithium battery voltage signal acquisition system further comprises a battery voltage sampling module, and the single chip microcomputer acquires the lithium battery voltage signal through the multi-path A/D detection multiplexing module and the battery voltage sampling module.
Preferably, the device also comprises a display screen, and the display screen is connected to the single chip microcomputer.
Compared with the prior art, the utility model has the beneficial effects that: this a detector for underground metal surveys, through the multichannel AD that sets up detect multiplexing module and gather the output signal of rear end amplifier enlargies to the singlechip in, the singlechip can be through the gain according to the signal conditioning front end program control amplifier who gathers, with this guarantee signal can not distort after front end program control amplifier and the twice enlargies of rear end amplifier, and simultaneously, the signal that is surveyed metal flyback to electromagnetic emission coil can be gathered once more by the singlechip through voltage sampling feedback module and multichannel AD detection multiplexing module and detect, improve the detection precision of being surveyed the metal, furthermore, this detector compares with prior art, do not adopt and move the looks ware, synchronous demodulator surveys, the instrument debugging is more convenient, and convenient to use.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure: 1. a single chip microcomputer; 2. a launch vibrator; 3. an electromagnetic transmitting coil; 4. a voltage sampling feedback module; 5. a program-controlled frequency-selective filter; 6. a front-end program control amplifier; 7. a receiving coil; 8. a back-end amplifier; 9. an audio amplifier; 10. a speaker; 11. a multi-path A/D detection multiplexing module; 12. a lithium battery; 13. a battery voltage sampling module; 14. and a display screen.
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.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by one of ordinary skill in the art as appropriate.
A detector for underground metal detection comprises a single chip microcomputer 1, wherein a signal output end of the single chip microcomputer 1 is connected with a transmitting vibrator 2, a signal output end of the transmitting vibrator 2 is connected with an electromagnetic transmitting coil 3, and a signal output end of the electromagnetic transmitting coil 3 is connected with a voltage sampling feedback module 4;
the signal output end of the singlechip 1 is also connected with a program-controlled frequency-selecting filter 5, the signal input end of the program-controlled frequency-selecting filter 5 is connected with a front-end program-controlled amplifier 6, and the signal input end of the front-end program-controlled amplifier 6 is connected with a receiving coil 7;
the signal output end of the program-controlled frequency-selecting filter 5 is connected with a rear-end amplifier 8, the signal output end of the rear-end amplifier 8 is connected with an audio amplifier 9, and the signal output end of the audio amplifier 9 is connected with a loudspeaker 10;
the signal output end of the rear-end amplifier 8 is also connected with a multi-path A/D detection multiplexing module 11;
the single chip microcomputer 1 collects an output signal of the rear-end amplifier 8 through the multi-path A/D detection multiplexing module 11, and controls the gain of the front-end program control amplifier 6 through the output signal of the rear-end amplifier 8;
the single chip microcomputer 1 collects output signals of the voltage sampling feedback module 4 through the multi-path A/D detection multiplexing module 11, compares the output signals of the voltage sampling feedback module 4 with signals received by the receiving coil 7 during detection, and identifies attributes of detected metals.
Further, the intelligent control system also comprises a lithium battery 12, and the lithium battery 12 is used for supplying power to the singlechip 1.
In addition, still include battery voltage sampling module 13, and singlechip 1 detects multiplexing module 11 and battery voltage sampling module 13 through multichannel AD and gathers lithium cell 12 voltage signal for real-time supervision lithium cell 12's electric quantity.
Specifically, still include display screen 14, and display screen 14 connects on singlechip 1, and display screen 14 is used for showing the detected metal's that discerns attribute condition to and the electric quantity of lithium cell 12 through showing singlechip 1.
It should be noted that, in this embodiment, the singlechip 1 controls the gain of the front-end programmable amplifier 6 through the output signal of the rear-end amplifier 8, and identifies the attribute of the detected metal through comparing the output signal of the voltage sampling feedback module 4 with the signal received by the receiving coil 7 during detection, which are all the prior art, but are not the main innovation points of the present invention, and can be completely implemented by those skilled in the art, and are not described herein again.
The working principle is as follows:
the single chip microcomputer 1 sends out a PWM signal with specific and fixed frequency to drive the transmitting oscillator 2 to generate a sine wave signal with high amplitude and corresponding frequency, and the sine wave signal is transmitted out by the electromagnetic transmitting coil 3; when the detected metal receives the transmitted sine wave signal, an eddy current is generated in the detected metal, so that induced electromotive force is formed; the generated induced electromotive force electromagnetic field can be reversely excited to the electromagnetic transmitting coil 3 and the receiving coil 7, so that the electromagnetic transmitting coil 3 and the receiving coil 7 generate electric signals with the frequency consistent with that of the induced electromotive force electromagnetic field;
the receiving coil 7 amplifies the electric signal induced by the detected metal eddy current electromotive force through the front-end program-controlled amplifier 6, the single chip microcomputer 1 controls the program-controlled frequency-selective filter 5 to select a signal with the same frequency as the transmitted alternating magnetic field, and then the signal drives the loudspeaker 10 to give out alarm sound when metal is detected through the rear-end amplifier 8 and the audio amplifier 9;
meanwhile, the output signal of the rear-end amplifier 8 is collected again by the singlechip 1 through the control multi-path A/D detection multiplexing module 11, the singlechip analyzes whether the amplified signal of the rear-end amplifier 8 is distorted according to the collected signal, and if the amplified signal is distorted, the gain of the front-end programmable control amplifier 6 is automatically adjusted to be low;
in addition, a voltage sampling feedback module 4 sampled from the electromagnetic transmitting coil 3 is re-collected by the singlechip 1 through a multi-path A/D detection multiplexing module 11, and the singlechip 1 comprehensively analyzes and identifies the characteristic attribute of the detected metal and displays the characteristic attribute on a display screen K according to the collected signal on the receiving coil 7 and the change signal on the electromagnetic transmitting coil 3;
furthermore, the battery voltage sampling 13 collects the electric quantity of the lithium battery 12 to the single chip microcomputer 1 through the multi-path A/D detection multiplexing module 11, so that the single chip microcomputer 1 detects whether the electric quantity of the lithium battery 12 is too low, and if the electric quantity of the battery is too low, a warning is given on a display screen.
It can be seen from the above that, when the detector for detecting underground metal of the present invention is used, the multi-channel a/D detection multiplexing module 11 is arranged to collect the output signal amplified by the back-end amplifier 8 to the single chip microcomputer 1, the single chip microcomputer 1 can adjust the gain of the front-end programmable amplifier 6 according to the collected signal, so as to ensure that the signal is not distorted after being amplified twice by the front-end programmable amplifier 6 and the back-end amplifier 8, and meanwhile, the signal flyback to the electromagnetic transmitting coil 3 from the detected metal can be collected and detected by the single chip microcomputer 1 again through the voltage sampling feedback module 4 and the multi-channel a/D detection multiplexing module 11, so as to improve the detection precision of the detected metal.
The foregoing shows and describes the general principles, essential features, and advantages of the utility model. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (4)
1. A detector for underground metal detection comprises a single chip microcomputer (1) and is characterized in that a signal output end of the single chip microcomputer (1) is connected with a transmitting vibrator (2), a signal output end of the transmitting vibrator (2) is connected with an electromagnetic transmitting coil (3), and a signal output end of the electromagnetic transmitting coil (3) is connected with a voltage sampling feedback module (4);
the signal output end of the single chip microcomputer (1) is further connected with a program control frequency selection filter (5), the signal input end of the program control frequency selection filter (5) is connected with a front-end program control amplifier (6), and the signal input end of the front-end program control amplifier (6) is connected with a receiving coil (7);
a signal output end of the program-controlled frequency-selecting filter (5) is connected with a rear-end amplifier (8), a signal output end of the rear-end amplifier (8) is connected with an audio amplifier (9), and a signal output end of the audio amplifier (9) is connected with a loudspeaker (10);
the signal output end of the rear-end amplifier (8) is also connected with a multi-channel A/D detection multiplexing module (11);
the single chip microcomputer (1) collects the output signal of the rear-end amplifier (8) through the multi-path A/D detection multiplexing module (11), and controls the gain of the front-end program control amplifier (6) through the output signal of the rear-end amplifier (8);
the single chip microcomputer (1) collects the output signal of the voltage sampling feedback module (4) through the multi-path A/D detection multiplexing module (11), compares the output signal of the voltage sampling feedback module (4) with the signal received by the receiving coil (7) during detection, and identifies the attribute of the detected metal.
2. A detector for underground metal detection according to claim 1, characterized by further comprising a lithium battery (12), said lithium battery (12) being adapted to power said single-chip microcomputer (1).
3. A detector for underground metal detection according to claim 2, characterized by further comprising a battery voltage sampling module (13), and the single chip microcomputer (1) collects the voltage signal of the lithium battery (12) through the multiplex a/D detection multiplexing module (11) and the battery voltage sampling module (13).
4. A detector for underground metal detection according to claim 1, characterized in that it further comprises a display screen (14), and the display screen (14) is connected to the single-chip microcomputer (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123380671.XU CN217034284U (en) | 2021-12-30 | 2021-12-30 | Detector for underground metal detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123380671.XU CN217034284U (en) | 2021-12-30 | 2021-12-30 | Detector for underground metal detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217034284U true CN217034284U (en) | 2022-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123380671.XU Active CN217034284U (en) | 2021-12-30 | 2021-12-30 | Detector for underground metal detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217034284U (en) |
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2021
- 2021-12-30 CN CN202123380671.XU patent/CN217034284U/en active Active
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