CN106019389A - Metal detector with near field communication function - Google Patents
Metal detector with near field communication function Download PDFInfo
- Publication number
- CN106019389A CN106019389A CN201610558017.8A CN201610558017A CN106019389A CN 106019389 A CN106019389 A CN 106019389A CN 201610558017 A CN201610558017 A CN 201610558017A CN 106019389 A CN106019389 A CN 106019389A
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- China
- Prior art keywords
- circuit
- field communication
- coil
- metal detector
- near field
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
Abstract
The invention discloses a metal detector with a near field communication function, which comprises a coil vibration circuit, a near field communication module, an alarming circuit and a control circuit, wherein a multi-vibrator circuit, an amplifier circuit and a detection coil in the coil vibration circuit are sequentially connected; the control circuit comprises a linear Hall element, an amplifier circuit, a peak detector circuit, an A/D conversion circuit and a single chip microcomputer in sequential connection; and the near field communication module and the alarming circuit are respectively connected with the control circuit. Thus, the defects that the detector in the prior art is extremely expensive; the domestic traditional metal detector uses an analog circuit for detection and control, the circuit is complicated, the detection sensitivity is low, the whole system is susceptible to external interference; and as the metal detector in the prior has no near field communication function, statistics of alarming information can not be completed are overcome.
Description
Technical field
The present invention relates to metal detection technical field, in particular it relates to a kind of metal detector with near field communication (NFC) function.
Background technology
Metal detector is as a kind of most important Security Inspection Equipments, and oneself is widely used in social life and industrial numerous areas.Such as on airport, megaevent (such as the Olympic Games), exhibition etc. all with metal detector, holdee carried out safety detection, to investigate the violated metals of nocuity such as cutter that luggage, parcel and human body carry secretly, gun, ammunition；Industrial department (including that wrist-watch, glasses, jewel, electronics etc. produce the factory containing metal product) also uses metal detector to detect discrepancy personnel, to prevent the loss of precious metal material；At present, even examination also begins to enable metal detector to prevent examinee from utilizing the instruments such as mobile phone to practise fraud.
As can be seen here, commercial production and personal safety are played an important role by metal detector.And in order to accurately judge the position that metal is concealed, it is necessary to metal detector has higher sensitivity.Send relevant persons in charge to sometimes for by warning message, so that warning message is carried out record simultaneously；At present.Although the most perfect the most existing series of products, but price and costliness thereof；Domestic traditional metal detector then utilizes analog circuit detect and control, its circuit is complicated, and detectivity is low, and whole system is easily by external interference, the metal detector of prior art does not possess near field communication (NFC) function simultaneously, causes the statistics of warning message to complete.
Summary of the invention
It is an object of the invention to, for the problems referred to above, propose a kind of metal detector with near field communication (NFC) function, to realize improving detection accuracy, it is achieved the advantage of record warning message.
For achieving the above object, the technical solution used in the present invention is: a kind of metal detector with near field communication (NFC) function, specifically include that coil oscillating circuit, near-field communication module, warning circuit and control circuit, in described coil oscillating circuit, multi-resonant oscillating circuit, amplifying circuit and search coil are sequentially connected with, described control circuit includes that linear hall element, amplifying circuit, peak-detector circuit, A/D change-over circuit and single-chip microcomputer are sequentially connected with, and described near-field communication module, warning circuit are connected with control circuit respectively.
Further, described coil oscillating circuit is specially, 555 intervalometers constitute a multivibrator, produce pulse signal, it is input to the base stage of audion after audion amplifies through electric capacity from the positive pulse signal of multivibrator output, the pulse signal that forming frequency degree of stability is high, power is bigger, and pulse signal is input in search coil, the electric current that generation moment is stronger in coil, thus around coil, produce constant alternating magnetic field.
Further, the pulse signal frequency that multivibrator produces is 24KHz, and dutycycle is 2/3.
Further, described amplifying circuit includes operational amplifier LM324.
Various embodiments of the present invention, owing to specifically including that coil oscillating circuit, near-field communication module, warning circuit and control circuit, in described coil oscillating circuit, multi-resonant oscillating circuit, amplifying circuit and search coil are sequentially connected with, described control circuit includes that linear hall element, amplifying circuit, peak-detector circuit, A/D change-over circuit and single-chip microcomputer are sequentially connected with, LED display circuit, audible alarm circuit and power circuit are connected with single-chip microcomputer respectively, and described near-field communication module, warning circuit are connected with control circuit respectively.Such that it is able to overcome detector price and costliness thereof in prior art；Domestic traditional metal detector then utilizes analog circuit detect and control, its circuit is complicated, and detectivity is low, and whole system is easily by external interference, overcome metal detector in prior art not possess near field communication (NFC) function simultaneously, cause the defect that the statistics of warning message cannot complete.
Other features and advantages of the present invention will illustrate in the following description, and, partly become apparent from description, or understand by implementing the present invention.
Below by embodiment, technical scheme is described in further detail.
Detailed description of the invention
Hereinafter the preferred embodiments of the present invention are illustrated, it will be appreciated that preferred embodiment described herein is merely to illustrate and explains the present invention, is not intended to limit the present invention.
Specifically, a kind of metal detector with near field communication (NFC) function, specifically include that coil oscillating circuit, near-field communication module, warning circuit and control circuit, in described coil oscillating circuit, multi-resonant oscillating circuit, amplifying circuit and search coil are sequentially connected with, described control circuit includes that linear hall element, amplifying circuit, peak-detector circuit, A/D change-over circuit and single-chip microcomputer are sequentially connected with, and described near-field communication module, warning circuit are connected with control circuit respectively.
Described coil oscillating circuit is specially, 555 intervalometers constitute a multivibrator, produce pulse signal, it is input to the base stage of audion after audion amplifies through electric capacity from the positive pulse signal of multivibrator output, the pulse signal that forming frequency degree of stability is high, power is bigger, and be input in search coil by pulse signal, the electric current that generation moment is stronger in coil, thus around coil, produce constant alternating magnetic field.
The pulse signal frequency that multivibrator produces is 24KHz, and dutycycle is 2/3.
Described amplifying circuit includes operational amplifier LM324.
Be made up of a multivibrator 555 intervalometers, producing frequency is 24KHz, and dutycycle is the pulse signal of 2/3.The myriametric wave frequency selecting 24KHz is to weaken the soil impact on electromagnetic wave.Replace with 2N2222 through electric capacity C7 is input to base stage (Q1 is β >=the 9013H of the 125) figure of Q1 from the positive pulse signal of multivibrator output, turn it on, after Q1 amplifies, it is the formation of the pulse signal that frequency stability is high, power is bigger to be input in search coil L1, the electric current that generation moment is stronger in coil, so that producing constant alternating magnetic field around coil.
The amplitude of sine wave signal produced by oscillating circuit is smaller, it is therefore desirable to amplifies and just can reprocess.In the design, signal amplification circuit uses the integrated operational amplifier LM324 that input impedance is high, drift is less, common mode rejection ratio is high.LM324 is four high guaily unit integrated circuit, and it uses 14 foot dual-in-line Plastic Package.Its inside comprises four groups of identical operational amplifiers of form, and except power supply is common, four groups of amplifiers are separate.
Warning message is sent to mobile phone or the flat board with wireless communication function by near-field communication module, and by relevant persons in charge's record.
At least can reach following beneficial effect: overcome detector price and costliness thereof in prior art；Domestic traditional metal detector then utilizes analog circuit detect and control, its circuit is complicated, and detectivity is low, and whole system is easily by external interference, the metal detector of prior art does not possess near field communication (NFC) function simultaneously, causes the statistics of warning message to complete.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, it is not limited to the present invention, although the present invention being described in detail with reference to previous embodiment, for a person skilled in the art, technical scheme described in foregoing embodiments still can be modified by it, or wherein portion of techniques feature is carried out equivalent.All within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (4)
1. a metal detector with near field communication (NFC) function, it is characterized in that, including coil oscillating circuit, near-field communication module, warning circuit and control circuit, in described coil oscillating circuit, multi-resonant oscillating circuit, amplifying circuit and search coil are sequentially connected with, described control circuit includes that linear hall element, amplifying circuit, peak-detector circuit, A/D change-over circuit and single-chip microcomputer are sequentially connected with, and described near-field communication module, warning circuit are connected with control circuit respectively.
The metal detector with near field communication (NFC) function the most according to claim 1, it is characterized in that, described coil oscillating circuit is specially, 555 intervalometers constitute a multivibrator, produce pulse signal, it is input to the base stage of audion after audion amplifies through electric capacity from the positive pulse signal of multivibrator output, the pulse signal that forming frequency degree of stability is high, power is bigger, and pulse signal is input in search coil, the electric current that generation moment is stronger in coil, thus around coil, produce constant alternating magnetic field.
The metal detector with near field communication (NFC) function the most according to claim 2, it is characterised in that the pulse signal frequency that multivibrator produces is 24KHz, and dutycycle is 2/3.
The metal detector with near field communication (NFC) function the most according to claim 3, it is characterised in that described amplifying circuit includes operational amplifier LM324.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610558017.8A CN106019389A (en) | 2016-07-15 | 2016-07-15 | Metal detector with near field communication function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610558017.8A CN106019389A (en) | 2016-07-15 | 2016-07-15 | Metal detector with near field communication function |
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| CN106019389A true CN106019389A (en) | 2016-10-12 |
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| CN201610558017.8A Pending CN106019389A (en) | 2016-07-15 | 2016-07-15 | Metal detector with near field communication function |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120028280A (en) * | 2010-09-14 | 2012-03-22 | 콤팔 일렉트로닉스 인코포레이션 | Electronic device and control method thereof |
| CN202614951U (en) * | 2012-06-21 | 2012-12-19 | 傅清河 | Metal detection device |
| CN203587817U (en) * | 2013-11-22 | 2014-05-07 | 南京信息工程大学 | Handheld digital metal detector |
| CN105005084A (en) * | 2015-08-11 | 2015-10-28 | 安徽远鸿机械自动化有限公司 | Method for detecting metal impurities in material |
| CN105527336A (en) * | 2014-10-22 | 2016-04-27 | 陕西同力电气有限公司 | Metal detector |
-
2016
- 2016-07-15 CN CN201610558017.8A patent/CN106019389A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120028280A (en) * | 2010-09-14 | 2012-03-22 | 콤팔 일렉트로닉스 인코포레이션 | Electronic device and control method thereof |
| CN202614951U (en) * | 2012-06-21 | 2012-12-19 | 傅清河 | Metal detection device |
| CN203587817U (en) * | 2013-11-22 | 2014-05-07 | 南京信息工程大学 | Handheld digital metal detector |
| CN105527336A (en) * | 2014-10-22 | 2016-04-27 | 陕西同力电气有限公司 | Metal detector |
| CN105005084A (en) * | 2015-08-11 | 2015-10-28 | 安徽远鸿机械自动化有限公司 | Method for detecting metal impurities in material |
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Application publication date: 20161012 |