CN204989499U - Automatic metal detector of discernment metal type - Google Patents
Automatic metal detector of discernment metal type Download PDFInfo
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- CN204989499U CN204989499U CN201520238378.5U CN201520238378U CN204989499U CN 204989499 U CN204989499 U CN 204989499U CN 201520238378 U CN201520238378 U CN 201520238378U CN 204989499 U CN204989499 U CN 204989499U
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Abstract
The utility model provides an automatic metal detector of discernment metal type, its characterized in that: including a MCU, transmitting coil, receiving coil, preamplifier, keyboard, alarm and PWM impulse generator, transmitting coil and the coupling of receiving coil irritability transmitting coil's input meets high -frequency ac, receiving coil's output connection preamplifier's input, the keyboard connects another input of MCU, MCU's an output connects the alarm, another output of MCU connects PWM impulse generator, PWM impulse generator organizes the PWM impulse generator of variable phase for N, N is for being greater than 1 natural number. The difference of produced induced electromotive force phase shift when the device passes through high frequency alternating magnetic field based on different metal materials has realized metal detector automatic identification alarming function.
Description
Technical field
The utility model relates to a kind of metal detector, particularly a kind of metal detector of automatic identification metal types.
Background technology
Metal detector is mainly used in the metal object that detection is imbedded in below earth's surface, is widely used in the fields such as underground pipeline detects, earthquake is speedily carried out rescue work, the military detects a mine.
When metal detector is applied to underground metalliferous detection, containing various mineral matter in stratum, they also can make metal detection produce signal, and the signal of these mineral can mask the signal of metal and create a false impression.Therefore metal detector can only detect the metal in shallow soil, helpless to buried metal target.In order to improve detection efficiency, being necessary to identify fast detected object, getting rid of the detection thing irrelevant with detection mission.
Summary of the invention
The utility model is intended to the metal detector proposing a kind of automatic identification metal types.This detector can identify detected object fast, gets rid of the detection thing irrelevant with detection mission.
The utility model realizes by the following technical solutions: a kind of metal detector of automatic identification metal types, is characterized in that: comprise a MCU, transmitting coil, receiving coil, a prime amplifier, keyboard, alarm and pwm pulse phase shift generator; Described transmitting coil is coupled with described receiving coil electromagnetic induction; The input of described transmitting coil connects high-frequency alternating current; The output of described receiving coil connects the input of described prime amplifier; The output of described prime amplifier connects the input of described pwm pulse phase shift generator; Described keyboard connects the input of described MCU; One of described MCU exports and connects described alarm; The control of described MCU exports the input connecing described pwm pulse phase shift generator; Described pwm pulse phase shift generator is the pwm pulse generator of N group variable phase in parallel, described N be greater than 1 natural number.
In the utility model one embodiment, described N is 2.
Further, described pwm pulse phase shift generator comprises the first electronic switching circuit, first-phase shifter control circuit, the first direct current amplifier, the second electronic switching circuit, second-phase shifter control circuit and the second direct current amplifier; One input of described first electronic switching circuit connects the output of described prime amplifier; Another input of described first electronic switching circuit connects the output of described first-phase shifter control circuit; The input of described first-phase shifter control circuit connects the control output of described MCU; The output of described first electronic switching circuit connects the input of described first direct current amplifier; The output of described first direct current amplifier connects second input of described MCU; One input of described second electronic switching circuit connects an input of described first electronic switching circuit; Another input of described second electronic switching circuit connects the output of described second-phase shifter control circuit; The input of described second-phase shifter control circuit connects the control output of described MCU; The output of described second electronic switching circuit connects the input of described second direct current amplifier; The output of described second direct current amplifier connects the 3rd input of described MCU.
In the utility model one embodiment, described alarm is Buzzing type alarm or audible-visual annunciator.
In the utility model one embodiment, described button is soft touch electronic switch or mechanical switch.
In the utility model one embodiment, also comprise a LCD display; The input of described LCD display connects the output of described MCU.
The utility model based on different metal materials by during high-frequency alternating magnetic field produce the difference of induction electromotive force phase shift, achieve metal detector and automatically identify warning function.This functional realiey can to get rid of the function that the metal that has nothing to do with detection mission is reported to the police in metal process.
Accompanying drawing explanation
Fig. 1 is the utility model one embodiment circuit theory diagrams.
Fig. 2 is the phase shift of the utility model one embodiment induction electromotive force.
Fig. 3 is the utility model one embodiment phase-shift pulse generator theory diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
A metal detector for automatic identification metal types, is characterized in that: comprise a MCU, transmitting coil, receiving coil, a prime amplifier, keyboard, alarm and pwm pulse phase shift generator; Described transmitting coil is coupled with described receiving coil electromagnetic induction; The input of described transmitting coil connects high-frequency alternating current; The output of described receiving coil connects the input of described prime amplifier; The output of described prime amplifier connects the input of described pwm pulse phase shift generator; Described keyboard connects the input of described MCU; One of described MCU exports and connects described alarm; The control of described MCU exports the input connecing described pwm pulse phase shift generator; Described pwm pulse phase shift generator is the pwm pulse generator of N group variable phase in parallel, described N be greater than 1 natural number.
Those skilled in the art easily know and must could form automatic discrimination function by least 2 group pwm pulse generators, adopt the pwm pulse generator of variable phase at the utility model pwm pulse generator.
In the utility model one embodiment, described N is 2.
Further, described pwm pulse phase shift generator comprises the first electronic switching circuit, first-phase shifter control circuit, the first direct current amplifier, the second electronic switching circuit, second-phase shifter control circuit and the second direct current amplifier; One input of described first electronic switching circuit connects the output of described prime amplifier; Another input of described first electronic switching circuit connects the output of described first-phase shifter control circuit; The input of described first-phase shifter control circuit connects the control output of described MCU; The output of described first electronic switching circuit connects the input of described first direct current amplifier; The output of described first direct current amplifier connects second input of described MCU; One input of described second electronic switching circuit connects an input of described first electronic switching circuit; Another input of described second electronic switching circuit connects the output of described second-phase shifter control circuit; The input of described second-phase shifter control circuit connects the control output of described MCU; The output of described second electronic switching circuit connects the input of described second direct current amplifier; The output of described second direct current amplifier connects the 3rd input of described MCU.
Further, described alarm is Buzzing type alarm or audible-visual annunciator.
In the utility model one embodiment, described button is soft touch electronic switch or mechanical switch.
In the utility model one embodiment, also comprise a LCD display; The input of described LCD display connects the output of described MCU.
The pwm signal generator of variable phase is used for the signalling channel in gating a certain moment.Based on different metal materials by during high-frequency alternating magnetic field produce the difference of induction electromotive force phase shift, the strobe pulse pwm signal of more than 2 groups and corresponding amplifying circuit are set, change the phase place that the corresponding detector of pwm pulse transmits, the detection DC level of different magnitude of voltage can be obtained at each amplifier out.These DC level are compared, just can judge type metal being detected.
The utility model one embodiment, N is 2.Its circuit theory diagrams are see Fig. 1, and the phase shift of its induction electromotive force is see Fig. 2.In testing process, apply high-frequency current to transmitting coil L1, metal object through high frequency AC magnetic field, can produce the induction electromotive force of a phase shift at receiving end L2, and the waveform of induction electromotive force is see B1, B2 of Fig. 2.According to the difference of metal material, this phase shift is advanced or lags behind and transmit.
Preferably, described MCU adopts the STM8S105K4 of STMicw Electronics, and the output of described receiving coil connects the input of described enlarge leadingly; The output of described enlarge leadingly connects the input of described No. two electronic switches; Described keyboard connects the input of described MCU; One of described MCU exports and connects described alarm.Two tunnels of described MCU control input P1, P2 that trigger pip connects described two road pwm pulse phase shift generators.Its principle of work is see Fig. 3.Described pwm pulse phase shift generator has an external interrupt input port separately, MCU first exports the enabling signal of two Low level effectives, trigger the external interrupt input port of described pwm pulse phase shift generator respectively, see P1, P2 in Fig. 3, to guarantee the same frequency of the phase-shift PWM signal exported and synchronous.Described pwm pulse phase shift generator, see C1, C2 in Fig. 3, reads the data of ROM, exports the PWM of desired phase, see CS1, CS2 pulse in Fig. 3 after the time t that time delay is different respectively.The phase differential signal of two pulse signals is see Fig. 2.
In the utility model one embodiment, comprise pwm pulse generator C1, C2 of two groups of variable phases, its pulsed frequency is consistent with detector transmission frequency, but phase-adjustable, pulse waveform is see CS1, CS2 of Fig. 2.Set the different phase place of each road pwm pulse S1, S2 opposing detector transmitting coil respectively, when detecting metal object, export making direct current amplifier A1, A2 and to export because of the difference of gating signal phase place or DC level U1, the U2 of plus or minus, the Changing Pattern according to U1, U2 can identify metal types automatically.
In the utility model one embodiment, set detector and have 2 kinds of mode of operations: 1, " all-metal " pattern, 2, " identification " pattern, digital signal processing circuit is reported to the police according to set Schema control and is exported, if " all-metal " pattern, then detect any type metal all to report to the police, if " identification " pattern, then the metal that only detecting needs type of alarm is just reported to the police.This warning output control function is realized by the simple programming of MCU, also can realize with the circuit that discrete component is formed.When detection instrument detects different metal types, the alarm sound that can produce different frequency promotes loudspeaker, earphone etc. and sends different frequency alarm sound, points out the type of the metal detected to user
It is noted that the utility model is applicable to the application of various metal detection technology, and be not limited to the application at underground metal detector.
Above-described embodiment limits the utility model never in any form, all changes done according to technical solutions of the utility model, when the function produced does not exceed the scope of technical solutions of the utility model, all belongs to protection domain of the present utility model.
Claims (6)
1. automatically identify a metal detector for metal types, it is characterized in that: comprise a MCU, transmitting coil, receiving coil, a prime amplifier, keyboard, alarm and pwm pulse phase shift generator;
Described transmitting coil is coupled with described receiving coil electromagnetic induction; The input of described transmitting coil connects high-frequency alternating current; The output of described receiving coil connects the first input of described prime amplifier; The output of described prime amplifier connects the input of described pwm pulse phase shift generator; Described keyboard connects the input of described MCU; One of described MCU exports and connects described alarm; The control of described MCU exports the input connecing described pwm pulse phase shift generator; Described pwm pulse phase shift generator is the pwm pulse generator of N group variable phase in parallel, described N be greater than 1 natural number.
2. the metal detector of automatic identification metal types according to claim 1, is characterized in that: described N is 2.
3. the metal detector of automatic identification metal types according to claim 2, it is characterized in that: described pwm pulse phase shift generator comprises the first electronic switching circuit, first-phase shifter control circuit, the first direct current amplifier, the second electronic switching circuit, second-phase shifter control circuit and the second direct current amplifier;
One input of described first electronic switching circuit connects the output of described prime amplifier; Another input of described first electronic switching circuit connects the output of described first-phase shifter control circuit; The input of described first-phase shifter control circuit connects the control output of described MCU; The output of described first electronic switching circuit connects the input of described first direct current amplifier; The output of described first direct current amplifier connects second input of described MCU;
One input of described second electronic switching circuit connects an input of described first electronic switching circuit; Another input of described second electronic switching circuit connects the output of described second-phase shifter control circuit; The input of described second-phase shifter control circuit connects the control output of described MCU; The output of described second electronic switching circuit connects the input of described second direct current amplifier; The output of described second direct current amplifier connects the 3rd input of described MCU.
4. the metal detector of automatic identification metal types according to claim 1, is characterized in that: described alarm is Buzzing type alarm or audible-visual annunciator.
5. the metal detector of automatic identification metal types according to claim 1, is characterized in that: the button of described keyboard is soft touch electronic switch or mechanical switch.
6. the metal detector of automatic identification metal types according to claim 1, is characterized in that: also comprise a LCD display; The input of described LCD display connects the output of described MCU.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520238378.5U CN204989499U (en) | 2015-04-18 | 2015-04-18 | Automatic metal detector of discernment metal type |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520238378.5U CN204989499U (en) | 2015-04-18 | 2015-04-18 | Automatic metal detector of discernment metal type |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105866858A (en) * | 2016-03-25 | 2016-08-17 | 东莞市华盾电子科技有限公司 | Calibrating method, testing method for mobile phone detecting and system thereof |
| CN105866846A (en) * | 2016-03-25 | 2016-08-17 | 东莞市华盾电子科技有限公司 | Hand-held iron weapon detector |
| CN112485830A (en) * | 2020-11-13 | 2021-03-12 | 漳州市东方智能仪表有限公司 | Automatic sensitivity adjusting method for wall detector |
-
2015
- 2015-04-18 CN CN201520238378.5U patent/CN204989499U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105866858A (en) * | 2016-03-25 | 2016-08-17 | 东莞市华盾电子科技有限公司 | Calibrating method, testing method for mobile phone detecting and system thereof |
| CN105866846A (en) * | 2016-03-25 | 2016-08-17 | 东莞市华盾电子科技有限公司 | Hand-held iron weapon detector |
| CN112485830A (en) * | 2020-11-13 | 2021-03-12 | 漳州市东方智能仪表有限公司 | Automatic sensitivity adjusting method for wall detector |
| CN112485830B (en) * | 2020-11-13 | 2023-08-22 | 漳州市东方智能仪表有限公司 | Sensitivity automatic adjusting method for wall detector |
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| C14 | Grant of patent or utility model | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20171205 Address after: 363000 Fujian city of Zhangzhou province Jintang Xiangcheng Jinfeng Economic Development Zone Science Park Road No. 1 Building 2 layer Patentee after: Zhangzhou City Yushan Electronic Manufacture Co., Ltd. Address before: 363000 Dongfang Science and Technology Industrial Zone, Jintang Road, Jinfeng development area, Zhangzhou, Fujian Patentee before: Zhangzhou Dongfang Intelligent Instrument Co.,Ltd. |
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| TR01 | Transfer of patent right |