CN105974483A - Metal detector - Google Patents
Metal detector Download PDFInfo
- Publication number
- CN105974483A CN105974483A CN201610558018.2A CN201610558018A CN105974483A CN 105974483 A CN105974483 A CN 105974483A CN 201610558018 A CN201610558018 A CN 201610558018A CN 105974483 A CN105974483 A CN 105974483A
- Authority
- CN
- China
- Prior art keywords
- circuit
- coil
- metal detector
- pulse signal
- multivibrator
- 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.)
- Pending
Links
Classifications
-
- 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
- G01V3/102—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 by measuring amplitude
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Electromagnetism (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
The invention discloses a metal detector. The metal detector mainly comprises a coil oscillation circuit and a control circuit, wherein a multivibrator circuit, an amplification circuit and a detection coil in the coil oscillation circuit are successively connected, a linear Hall element, an amplification circuit, a peak demodulation circuit, an A/D conversion circuit and a single-chip microcomputer in the control circuit are successively connected, and an LED display circuit, a sound alarm circuit and a power supply circuit are connected with the single-chip microcomputer. According to the invention, the disadvantage of extremely high price of a detector in the prior art can be overcome; and a conventional domestic metal detector carries out detection and control by use of a simulation circuit, the circuit is complex, the detection sensitivity is low, and the whole system is easily interfered by the outside world.
Description
Technical field
The present invention relates to metal detection technical field, in particular it relates to a kind of metal detector.
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.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, and 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 detector, to realize the advantage improving detection accuracy.
For achieving the above object, the technical solution used in the present invention is: a kind of metal detector, specifically include that coil oscillating circuit and control circuit, in described coil oscillating circuit, multi-resonant oscillating circuit, amplifying circuit and search coil are sequentially connected with, in described control circuit, linear hall element, amplifying circuit, peak-detector circuit, A/D change-over circuit and single-chip microcomputer are sequentially connected with, and LED display circuit, audible alarm circuit and power circuit are connected with single-chip microcomputer 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 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 LED display circuit, audible alarm circuit and power circuit are connected with single-chip microcomputer 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, and its circuit is complicated, and detectivity is low, and whole system is easily by external interference.
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, specifically include that coil oscillating circuit and control circuit, in described coil oscillating circuit, multi-resonant oscillating circuit, amplifying circuit and search coil are sequentially connected with, in described control circuit, linear hall element, amplifying circuit, peak-detector circuit, A/D change-over circuit and single-chip microcomputer are sequentially connected with, and LED display circuit, audible alarm circuit and power circuit are connected with single-chip microcomputer 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.
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, and its circuit is complicated, and detectivity is low, and whole system is easily by external interference.
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, it is characterized in that, including coil oscillating circuit and control circuit, in described coil oscillating circuit, multi-resonant oscillating circuit, amplifying circuit and search coil are sequentially connected with, in described control circuit, linear hall element, amplifying circuit, peak-detector circuit, A/D change-over circuit and single-chip microcomputer are sequentially connected with, and LED display circuit, audible alarm circuit and power circuit are connected with single-chip microcomputer respectively.
Metal detector 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, are input to the base stage of audion from the positive pulse signal of multivibrator output after audion amplifies through electric capacity, 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.
Metal detector 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.
Metal detector 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 |
|---|---|---|---|
| CN201610558018.2A CN105974483A (en) | 2016-07-15 | 2016-07-15 | Metal detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610558018.2A CN105974483A (en) | 2016-07-15 | 2016-07-15 | Metal detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105974483A true CN105974483A (en) | 2016-09-28 |
Family
ID=56952473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610558018.2A Pending CN105974483A (en) | 2016-07-15 | 2016-07-15 | Metal detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105974483A (en) |
Citations (4)
| 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 |
| 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 |
-
2016
- 2016-07-15 CN CN201610558018.2A patent/CN105974483A/en active Pending
Patent Citations (4)
| 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 |
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105527336A (en) | Metal detector | |
| CN203587817U (en) | Handheld digital metal detector | |
| CN204882890U (en) | Novel handheld metal detector can fix a position | |
| CN102488520A (en) | Radar life body information extracting and processing system for monitoring life information | |
| CN106226825A (en) | A kind of metal detecting device | |
| CN201622355U (en) | Metal detection door | |
| Yavari et al. | System-on-Chip based Doppler radar occupancy sensor | |
| CN105974482A (en) | Metal detector with additional function | |
| CN105974483A (en) | Metal detector | |
| CN101422363B (en) | Micro flux-gate lung magnetic signal detection device | |
| CN106019389A (en) | Metal detector with near field communication function | |
| CN201477423U (en) | Intelligent vibration monitoring and protecting apparatus | |
| CN105974485A (en) | Metal detector with near field communication function and expansion storage function | |
| CN105974484A (en) | Multifunctional metal detector | |
| CN106168681A (en) | A kind of metal detector with regulation warning volume | |
| CN106249303A (en) | A kind of metal detector with near field communication (NFC) function and extension storage function | |
| CN109669209A (en) | Seismic sensor cable instrument | |
| CN204949584U (en) | Intelligence skirt | |
| CN206960559U (en) | A kind of EAS electronic tags mass parameter detector | |
| CN201242569Y (en) | Radiation protection detector | |
| CN105607132A (en) | Oscillation detection-based metal detector | |
| CN205843840U (en) | A kind of multi-chip differential type SAW temperature sensor | |
| CN201829034U (en) | Lost property alarm | |
| CN207545076U (en) | A kind of wrist-watch for being used to detect pulse | |
| CN205485347U (en) | Can detect electromagnetic radiation's wrist -watch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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. |
|
| CB02 | Change of applicant information | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160928 |
|
| RJ01 | Rejection of invention patent application after publication |