CN106226825A - A kind of metal detecting device - Google Patents
A kind of metal detecting device Download PDFInfo
- Publication number
- CN106226825A CN106226825A CN201610558013.XA CN201610558013A CN106226825A CN 106226825 A CN106226825 A CN 106226825A CN 201610558013 A CN201610558013 A CN 201610558013A CN 106226825 A CN106226825 A CN 106226825A
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- CN
- China
- Prior art keywords
- circuit
- coil
- warning
- detecting device
- volume
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- G01V3/101—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 by measuring the impedance of the search coil; by measuring features of a resonant circuit comprising the search coil
Abstract
The invention discloses a kind of metal detecting device, specifically include that coil oscillating circuit, warning circuit, warning circuit volume testing circuit and control circuit, multi-resonant oscillating circuit in coil oscillating circuit, amplifying circuit and search coil are sequentially connected with, linear hall element in control circuit, amplifying circuit, peak-detector circuit, A/D change-over circuit and single-chip microcomputer are sequentially connected with, the sound size that sound detection circuit detection warning circuit sends, the size adjustment of warning volume is controlled by control circuit, A/D change-over circuit includes ADC0809, overcome detector in prior art expensive；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, realize alarm sound simultaneously and adjust warning volume along with the sound size of surrounding, strengthen supervision.
Description
Technical field
The present invention relates to metal detection technical field, in particular it relates to a kind of metal detecting device.
Background technology
Metal detector is as a kind of most important Security Inspection Equipments, and oneself is widely used in social life and industry
The numerous areas produced.Such as on airport, megaevent (such as the Olympic Games), exhibition etc. all come passing with metal detector
Personnel carry out safety detection, to investigate the violated metal objects of nocuity such as cutter that luggage, parcel and human body carry secretly, gun, ammunition
Product；Industrial department (including that wrist-watch, glasses, jewel, electronics etc. produce the factory containing metal product) also uses metal to visit
Survey device discrepancy personnel to be detected, to prevent the loss of precious metal material；At present, even examination also begins to enable metal spy
Surveying device prevents 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.Meanwhile, when the situation many people
Under, the sound of detector can be submerged, and causes staff can not find in time, at present.Although it is the most existing the most perfect
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.
Summary of the invention
It is an object of the invention to, for the problems referred to above, propose a kind of metal detecting device, to realize improving detection accuracy
Advantage.
For achieving the above object, the technical solution used in the present invention is: a kind of metal detecting device, specifically includes that coil
Oscillating circuit, warning circuit, warning circuit volume testing circuit and control circuit, multi-harmonic-oscillations electricity in described coil oscillating circuit
Road, amplifying circuit and search coil are sequentially connected with, and described control circuit includes linear hall element, amplifying circuit, peak detection
Circuit, A/D change-over circuit and single-chip microcomputer are sequentially connected with, warning circuit volume detection testing circuit detection alarm sound size, and
Sending detection signal to control circuit, control circuit control the size adjustment of warning volume, described A/D change-over circuit includes
ADC0809。
Further, described coil oscillating circuit, specifically, 555 intervalometers constitute a multivibrator, produces pulse
Signal, is input to the base stage of audion from the positive pulse signal of multivibrator output after audion amplifies through electric capacity, shape
Become the pulse signal that frequency stability is high, power is bigger, and pulse signal is input in search coil, produce wink in coil
Between stronger electric current, 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.
Further, described volume testing circuit include detection module and receiver module, described detection module include microphone,
Operational amplifier CA3130, described operational amplifier CA3130 are high-gain inverting amplifier mode of operation, and input small area analysis swashs
Encouraging operational amplifier CA3130 work, described receiver module is specifically, transmission of sound signals is to voltage pump circuit, voltage pump circuit
AC signal rectification is maintained simultaneously the output voltage of operational amplifier CA3130.
Various embodiments of the present invention, owing to specifically including that coil oscillating circuit, warning circuit, warning circuit volume detect
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 sound detection circuit detection warning circuit is sent out
The sound size gone out, and detection signal is sent to control circuit, control circuit control the size adjustment of warning volume.
Other features and advantages of the present invention will illustrate in the following description, and, partly become from description
Obtain it is clear that 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 only used
In the description and interpretation present invention, it is not intended to limit the present invention.
Specifically, a kind of metal detecting device, specifically include that coil oscillating circuit, warning circuit, warning circuit volume are examined
Slowdown monitoring circuit and control circuit, in described coil oscillating circuit, multi-resonant oscillating circuit, amplifying circuit and search coil are sequentially connected with, institute
State control circuit and include that linear hall element, amplifying circuit, peak-detector circuit, A/D change-over circuit and single-chip microcomputer are sequentially connected with,
Warning circuit volume detection testing circuit detection alarm sound size, and detection signal is sent to control circuit, by controlling electricity
Road controls the size adjustment of warning volume, and described A/D change-over circuit includes ADC0809.
Described coil oscillating circuit, specifically, 555 intervalometers constitute a multivibrator, produces pulse signal, from many
The positive pulse signal of harmonic oscillator output is input to the base stage of audion after audion amplifies through electric capacity, and forming frequency is stable
The pulse signal that degree is high, power is bigger, and pulse signal is input in search coil, the electricity that generation moment is stronger in coil
Stream, 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.
Described volume testing circuit includes that detection module and receiver module, described detection module include microphone, operation amplifier
Device CA3130, described operational amplifier CA3130 are high-gain inverting amplifier mode of operation, and input small area analysis excitation computing is put
Big device CA3130 work, described receiver module is specifically, transmission of sound signals is to voltage pump circuit, and voltage pump circuit is to exchange letter
Number rectification maintains the output voltage of operational amplifier CA3130 simultaneously.
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.From the positive pulse letter of multivibrator output
Number replace with 2N2222 in electric capacity C7 is input to base stage (Q1 is β >=the 9013H of the 125) figure of Q1 so that it is conducting, put through Q1
After great, it be the formation of the pulse signal that frequency stability is high, power is bigger and be input in search coil L1, produce in coil
The electric current that moment is stronger, 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 locate again
Reason.In the design, signal amplification circuit uses the integrated operational amplifier that input impedance is high, drift is less, common mode rejection ratio is high
LM324.LM324 is four high guaily unit integrated circuit, and it uses 14 foot dual-in-line Plastic Package.It is complete that its inside comprises four groups of forms
Exactly the same operational amplifier, except power supply is common, four groups of amplifiers are separate.
Information owing to collecting is continually varying analog quantity, it is impossible to directly processed by single-chip microcomputer, therefore it is necessary to this
A little analog quantitys can be input to process in single-chip microcomputer after being converted into digital quantity, has selected economical and practical here
ADC0809 type A/D converter completes analog digital conversion.
At least can reach following beneficial effect: such that it is able to overcome detector price and costliness thereof in prior art；State
Interior traditional metal detector then utilizes analog circuit detect and control, and its circuit is complicated, and detectivity is low, and
Whole system, easily by external interference, realizes alarm sound simultaneously and adjusts warning volume along with the sound size of surrounding, add
Strong supervision.
Finally it is noted that the foregoing is only the preferred embodiments of the present invention, it is not limited to the present invention,
Although being described in detail the present invention with reference to previous embodiment, for a person skilled in the art, it still may be used
So that the technical scheme described in foregoing embodiments to be modified, 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 in the present invention's
Within protection domain.
Claims (5)
1. a metal detecting device, it is characterised in that include that coil oscillating circuit, warning circuit, warning circuit volume detect
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, report
Alert circuit volume detection testing circuit detection alarm sound size, and detection signal is sent to control circuit, by control circuit
Controlling the size adjustment of warning volume, described A/D change-over circuit includes ADC0809.
A kind of metal detecting device the most according to claim 1, it is characterised in that described coil oscillating circuit specifically,
555 intervalometers constitute a multivibrator, produce pulse signal, from the positive pulse signal of multivibrator output through electric capacity
It is input to the base stage of audion after audion amplifies, the pulse signal that forming frequency degree of stability is high, power is bigger, and by pulse
Signal is input in search coil, the electric current that generation moment is stronger in coil, thus produces constant alternation magnetic around coil
?.
A kind of metal detecting device the most according to claim 2, it is characterised in that the pulse signal that multivibrator produces
Frequency is 24KHz, and dutycycle is 2/3.
A kind of metal detecting device the most according to claim 3, it is characterised in that described amplifying circuit includes operation amplifier
Device LM324.
A kind of metal detecting device the most according to claim 4, it is characterised in that described volume testing circuit includes detection
Module and receiver module, described detection module includes that microphone, operational amplifier CA3130, described operational amplifier CA3130 are high
Gain inverting amplifier mode of operation, input small area analysis excitation operational amplifier CA3130 work, described receiver module specifically,
Transmission of sound signals is to voltage pump circuit, and voltage pump circuit maintains to AC signal rectification that operational amplifier CA3130's is defeated simultaneously
Go out voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610558013.XA CN106226825A (en) | 2016-07-15 | 2016-07-15 | A kind of metal detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610558013.XA CN106226825A (en) | 2016-07-15 | 2016-07-15 | A kind of metal detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106226825A true CN106226825A (en) | 2016-12-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610558013.XA Pending CN106226825A (en) | 2016-07-15 | 2016-07-15 | A kind of metal detecting device |
Country Status (1)
| Country | Link |
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| CN (1) | CN106226825A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109932752A (en) * | 2017-12-15 | 2019-06-25 | 蒋伟 | A kind of metal detector |
| CN109932750A (en) * | 2019-04-15 | 2019-06-25 | 王开 | A kind of metal detection sensing integrated circuit and metal detection sensor circuit |
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| CN1909365A (en) * | 2005-08-02 | 2007-02-07 | 乐金电子（昆山）电脑有限公司 | Volume automatic regulating device and its method |
| KR20120028280A (en) * | 2010-09-14 | 2012-03-22 | 콤팔 일렉트로닉스 인코포레이션 | Electronic device and control method thereof |
| CN103152668A (en) * | 2012-12-22 | 2013-06-12 | 深圳先进技术研究院 | Adjusting method of output audio and system thereof |
| 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 |
| CN105607132A (en) * | 2015-12-17 | 2016-05-25 | 无锡信大气象传感网科技有限公司 | Oscillation detection-based metal detector |
| CN105676717A (en) * | 2014-11-21 | 2016-06-15 | 鸿富锦精密工业(武汉)有限公司 | Volume adjustment circuit and electronic device employing same |
-
2016
- 2016-07-15 CN CN201610558013.XA patent/CN106226825A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1909365A (en) * | 2005-08-02 | 2007-02-07 | 乐金电子（昆山）电脑有限公司 | Volume automatic regulating device and its method |
| KR20120028280A (en) * | 2010-09-14 | 2012-03-22 | 콤팔 일렉트로닉스 인코포레이션 | Electronic device and control method thereof |
| CN103152668A (en) * | 2012-12-22 | 2013-06-12 | 深圳先进技术研究院 | Adjusting method of output audio and system thereof |
| 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 |
| CN105676717A (en) * | 2014-11-21 | 2016-06-15 | 鸿富锦精密工业(武汉)有限公司 | Volume adjustment circuit and electronic device employing same |
| CN105607132A (en) * | 2015-12-17 | 2016-05-25 | 无锡信大气象传感网科技有限公司 | Oscillation detection-based metal detector |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109932752A (en) * | 2017-12-15 | 2019-06-25 | 蒋伟 | A kind of metal detector |
| CN109932750A (en) * | 2019-04-15 | 2019-06-25 | 王开 | A kind of metal detection sensing integrated circuit and metal detection sensor circuit |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 545006 No. 20, No. 2, 2 District, E, district 102, new Liu Road, Liuzhou, the Guangxi Zhuang Autonomous Region. Applicant after: LIUZHOU GUOTAO TECHNOLOGY CO., LTD. Address before: 545005 No. 1, unit 1, Kim Du Hui, 16 Tan Zhong Xi Road, Liuzhou, the Guangxi Zhuang Autonomous Region, No. 5-13 Applicant before: LIUZHOU GUOTAO TECHNOLOGY CO., LTD. |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20161214 |