CN105891893A - Hand-held specific metal detector - Google Patents
Hand-held specific metal detector Download PDFInfo
- Publication number
- CN105891893A CN105891893A CN201610177250.1A CN201610177250A CN105891893A CN 105891893 A CN105891893 A CN 105891893A CN 201610177250 A CN201610177250 A CN 201610177250A CN 105891893 A CN105891893 A CN 105891893A
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- Prior art keywords
- coil
- circuit
- control chip
- hand
- detection
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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
Abstract
The invention relates to a hand-held specific metal detector comprising a housing, a detection coil, a control chip, an alarm unit, a signal generator circuit, a signal acquisition circuit, a key and a power supply. The detection coil, the control chip, the alarm unit, the signal generator circuit, the signal acquisition circuit, the key and the power supply are installed in the housing. A detection zone, a part zone, and a handle zone that are connected mutually are formed in the housing. The detection coil arranged in the detection zone includes a large coil and a small coil, wherein the coils have different structures and are arranged in a same plane. According to the invention, the detection coil is configured to have the large coil and the small coil that have different structures and a detection magnetic field covering the detection area is formed by using two different coils; because different kinds of metal materials generate different secondary magnetic fields in the detection magnetic field due to eddies, the two coils receive inductive current signals of the secondary magnetic fields and transmit the signals to a control chip; and the control chip carries out selective alarming according to specific electric signals. Therefore, alarming of a certain metal material or several kinds of specific metal materials is realized.
Description
Technical field
The present invention relates to technical field of security inspection equipment, be a kind of hand-held special metal detector reported to the police for special metal in particular.
Background technology
Handheld metal detector, as a kind of conventional security device, is widely used in the public places such as airport, station, customs, law court, is used for
Detection is hidden in the metal with human body.Handheld metal detector is mainly used in the detection of violated metal object in public safety place, such as
Controlled knife, firearms etc., pre-anti-riot probably attack；And at some special occasions such as factory, factories and miness, then it is primarily directed to certain special metal, such as
Gold, silver, copper etc., prevent the loss of precious metal goods.Handheld metal detector utilizes the principle of electromagnetic induction, by detector housing
The magnetic field that Electromagnetic Launching coil produces, when there are metal object in this magnetic field, can produce vortex flow inside metal, vortex flow can be produced again
Magnetisation field affects original magnetic field in turn, and receiving coil in detector and interlock circuit detect the change in this magnetic field, thus detect metal
Existence, cause detector sound and light alarm.
Handheld metal survey meter in the market uses beat frequency oscillator principle substantially.Metal detection head is by one group of inductance coil and one capacitance group in parallel
Become LC resonance circuit.Coil is a part for agitator, the output signal frequency of this agitator and the oscillator signal of another one fixed frequency
Being mixed, its difference on the frequency (i.e. beat frequency) just falls in range of audibility.When there being metal near probe coil, the resonant frequency in loop and
The equiva lent impedance in loop changes, and causes oscillation circuit frequency to change, and detects this change thus indirect detection goes out the existence of metal.But
In the safety check of common public place, what we mainly detected is prohibited items, such as controlled knife, firearms etc., but at present, market produces
Handheld metal detector that sell, that use in all of safety check occasion, is that all of metal all can produce warning, controlled knife and firearms meeting
Reporting to the police, key, button, mobile phone etc. all can be reported to the police.
Generally all can carry with some conventional metals, such as key, belt fastener, mobile phone, coin etc. with people, and these article are all
Metal detector can be caused to report to the police, cause tested personnel almost everybody report to the police state, thus need security staff to be touched by hands or alternate manner not
Disconnected checking confirms whether these metals are prohibited items.On the one hand this detection mode causes safety check efficiency the lowest；On the other hand, safety check is caused
The labor intensity of personnel is very big, and the problem such as also can result in blockage when the occasion that flow of the people is big uses.
Thus be badly in need of a kind of reporting to the police just for prohibited items (such as controlled knife, rifle etc.), and to typically carry with metal (as key,
Mobile phone etc.) metal detector do not reported to the police.
Summary of the invention
To be solved technical problem is that of this patent overcomes deficiency of the prior art, it is provided that a kind of to a certain or the warning of certain several special metal
Hand-held special metal detector.
For solving prior art problem, this patent the technical scheme is that a kind of hand-held special metal detector, including housing and be arranged on shell
Internal search coil, control chip, alarm unit, signal generating circuit, signal acquisition circuit, button and power supply, described housing is formed mutually
Detecting area, component region and the handle region connected, described search coil is arranged on described detecting area, and described search coil includes the big line of architectural difference
Circle and little coil, in described big coil and little coil are generally aligned in the same plane, described little coil is arranged on described big coil inside zone line.This patent
Search coil be set to the big coil of architectural difference and little coil, utilize the most collinear circle formed cover search coverage detection magnetic field, due to difference
Metal detection magnetic field in produce different secondary magnetic fields because of eddy current, described two coils receive the sensor current signal of secondary magnetic field and transmit
To control chip, control chip carries out selectivity warning according to the specific signal of telecommunication, thus realizes reporting to the police a certain or certain several special metal.
Realizing rationale here is that of the present invention, the metallic conductor of motion all can be because of electromagnetic induction in the magnetic field of change or in magnetic field for metallic conductor
And producing eddy current, eddy current closes flowing inside metallic conductor and forms secondary field, and the direction in its magnetic field is contrary with magnetic field, eddy current produce
The size in magnetic field depends on the shape of metal object, size, distance, also depends on the resistivity of metal, permeability etc. simultaneously.Daily for us
For these metals of application, every kind of metal has the most different resistivity and permeability, and the different resistivity of metal and permeability are because of electromagnetism
In the eddy current sensed and produce, its phase characteristic is also different.The electricity relevant to the eddy current signal that detected metal produces received by detection
The phase characteristic of signal, thus correspond to different metals, it is achieved that the identification of metal.Certainly, this patent can be arranged according to demand, only to certain
A kind of or certain several specific metal are reported to the police, and do not report to the police other metal.The most AT STATION, customs, the public place such as law court, could be arranged to
To controlled knife firearms alarm mode；Then can be set as certain special metal alarm mode at non-ferrous metal factories and miness, such as only copper is reported to the police, right
Other metal not warning etc..All-metal alarm mode can certainly be set as, all metals are all reported to the police.Hand-held special metal detector realizes
Be target acquisition the most targetedly and warning function, so substantially increase detection efficiency, alleviate the labor intensity of testing staff simultaneously,
It is truly realized the original purpose of contraband detection.
Described big coil includes that transmitting coil, described little coil include feedback coil；Or described big coil includes that feedback coil, described little coil include
Transmitting coil, described receiving coil is arranged on described big coil or little coil.Transmitting coil can individually can also be individually at big line on little coil
On circle.When transmitting coil is on little coil, feedback coil is on big coil；When transmitting coil is on big coil, feedback coil is on little coil.
In the course of the work, transmitting coil and feedback coil form the detection magnetic field of some strength around the detecting area of described detector；Transmitting coil simultaneously
The magnetic field that comfortable receiving coil region each with feedback coil is formed is equal in magnitude, in opposite direction, and i.e. two coils form magnetic signal and become in receiving coil region
It is bordering on the balancing fields of zero.Now, in detection process, on receiving coil, produced faradic current can be regarded as and is entirely detected metal institute
Produce the faradic current of secondary magnetic field, and this current signal is finally fed back to control chip.The low frequency sine wave signal driving transmitting coil can be by
Frequency oscillator produces, or is produced by control chip or special signal generation chip (such as ICL8038) generation, and sine wave signal is through driving
Transmitting coil it is added to after Dong.
It addition, described big coil and little coil can all include receiving coil, the most described transmitting coil is arranged on described big coil or little coil.
When having receiving coil on size coil, feedback coil can not have.Without feedback coil, then by the turn ratio being sized on coil,
The faradic current received making the two coil is equal in magnitude in opposite direction, and it is zero that the faradic current produced in receiving loop is cancelled out each other.This
Planting under situation, owing to not arranging feedback coil, the receiving coil on the biggest coil and the receiving coil on little coil connect signals collecting jointly
Circuit.Now, around the detecting area of described detector, the detection magnetic field of some strength is only formed by transmitting coil.Meanwhile, by adjusting big coil
On receiving coil and the turn ratio of receiving coil on little coil so that on two receiving coils produced by the magnetic field of transmitting coil faradic current
Equal in magnitude in opposite direction, the faradic current i.e. produced in signal acquisition circuit is zero.Now, in detection process, signal acquisition circuit is accepted
Current signal can regard as entirely owing to detected metal secondary magnetic field is at sensor current signal produced by two receiving coils, and the most at last
This current signal is delivered to control chip.
Described signal generating circuit includes the first filter circuit, shaping circuit, the first amplifying circuit and the drive circuit being sequentially connected with, described filtered electrical
Road connects control chip, and described drive circuit connects transmitting coil or feedback coil.In the course of the work, control chip produces according to sequence circuit
The input current signal of raw some strength, this input current signal processes through the first filter circuit, shaping circuit, and by the first amplification electricity
Road carries out signal amplification, is input in corresponding transmitting coil or feedback coil finally by drive circuit.Simultaneously according to practical situation, transmitting coil or
In feedback coil, respective input current size and Orientation is incomplete same, has corresponding change.
Described signal acquisition circuit includes frequency-selecting pre-arcing road, the second filter circuit and the second amplifying circuit being sequentially connected with, described frequency-selecting pre-arcing road
Connecting receiving coil, described second amplifying circuit connects control chip.In the course of the work, to enter frequency-selecting pre-for the sensor current signal in receiving coil
Electric discharge road, the second filter circuit process, and are amplified through the second amplifying circuit, recently enter in control chip.
Further, described control chip is provided with analog to digital conversion circuit, and analog-digital conversion circuit as described connects the second amplifying circuit.So, put by second
The analogue signal of big circuit input is converted to digital signal through analog to digital conversion circuit, then is judged by control chip.Meanwhile, described control chip is also
It is provided with the database storage unit for storing metal warning electrical signal data data.Described database storage unit storage has one or more to need report
The signal of telecommunication data of alert metal.In detection process, control chip is according to needing warning in the detected metal signal of telecommunication gathered and database storage unit
The metal signal of telecommunication compares, and carries out selectivity warning.
Described detector also includes that Power Management Unit, described Power Management Unit are connected with described power supply, and described Power Management Unit is to power supply low pressure
Situation is reported to the police, and is managed the charging process of power supply simultaneously.When cannot be carried out detection operations when the brownout of detector power supply, power supply
Administrative unit detects the situation of the brownout of power supply and sends corresponding alarm signal to inform that detector is charged by safety inspector in time；Work as detection
Device is when charging, and the charge condition of Power Management Unit detection power supply, when electric quantity of power supply is full of, Power Management Unit controls power supply and external charge
Circuit disconnects, and points out safety inspector by this situation.
Described alarm unit includes one or more in Multicolor LED lamp light crossing-signal, buzzerphone alarm apparatus or vibration alarm.When detector is visited
In the presence of measuring specific metal, alarm unit can by LED lamplight alarm, buzzerphone alarm apparatus or vibration alarm provide light warning,
Audible alarm or vibration alarming, it is ensured that safety inspector can know this warning message at once.
Compared with prior art, the search coil of this patent is set to the big coil of architectural difference and little coil.Utilize the most collinear circle to be formed and cover spy
Surveying the detection magnetic field in region, two coils receive the sensor current signal of secondary magnetic field produced by detected metal and are delivered to control chip simultaneously, control
Coremaking sheet carries out selectivity warning according to the specific signal of telecommunication, thus realizes reporting to the police a certain or certain several special metal.The most permissible
It is greatly improved detection efficiency, reduces false alarm.Realize low failing to report, low wrong report quickly detects, it is achieved the quick detection of big flow.
Accompanying drawing explanation
Accompanying drawing 1 is the theory diagram of this patent embodiment.
Accompanying drawing 2 is the structural representation of this patent embodiment.
Accompanying drawing 3 is the structural representation of this patent embodiment search coil.
Detailed description of the invention
Below in conjunction with accompanying drawing, this patent is further explained explanation.Accompanying drawing being merely cited for property explanation, it is impossible to be interpreted as the restriction to this patent；
In order to the present embodiment is more preferably described, some parts of accompanying drawing have omission, zoom in or out；To those skilled in the art, in accompanying drawing, some is public
Know that structure and explanation thereof may be omitted will be understood by.
Hand-held special metal detector as depicted in figs. 1 and 2, the search coil including housing and being arranged in housing, control chip, warning list
Unit, signal generating circuit, signal acquisition circuit, button and power supply, described signal generating circuit includes the first filter circuit, the shaping being sequentially connected with
Circuit, the first amplifying circuit and drive circuit, described signal acquisition circuit includes frequency-selecting pre-arcing road, the second filter circuit and second being sequentially connected with
Amplifying circuit.Described search coil 10 includes big coil 14 and the little coil 15 of architectural difference, and described big coil 14 and little coil 15 are positioned at same
In plane.
As it is shown on figure 3, described big coil 14 and little coil 15 are at grade and CMP, described big coil 14 includes transmitting coil 11,
Described little coil 15 includes feedback coil 12 and receiving coil 13.Transmitting coil 11 and feedback coil 12 shape around the detecting area of described detector
Become the detection magnetic field of some strength.Meanwhile, transmitting coil 11 is contrary with feedback coil 12 magnetic direction of each self-forming in receiving coil 13,
I.e. two coils receiving coil 13 region formed magnetic signal level off to zero balancing fields.
Described control chip 20 produce low frequency sinusoidal current signal through the first filter circuit 31, shaping circuit the 32, first amplifying circuit 33 with
And after drive circuit 34, drive circuit 34 be transferred to transmitting coil 11 and feedback coil 12, and formed at detecting area according to electromagnetic induction principle
The electromagnetic field of one alternation.
The reception current signal of described receiving coil 13 is through the adjustment of frequency-selecting pre-arcing road the 41, second filter circuit the 42, second amplifying circuit 43
After amplification, eventually enter into control chip 20.Described control chip 20 is provided with analog to digital conversion circuit, and analog-digital conversion circuit as described is the simulation received
Signal is converted in digital signal comparison database memory element one or more signal of telecommunication data needing warning metal, is analyzed processing.Its
In, control chip 20 judges size or the distance of tested metal according to the signal amplitude received.Control chip 20 is according to receiving
The phase place of signal and the phase place launching signal compare, according to the data in the different of its phase contrast comparison database memory element, it is judged that different
Metal material, and specific metal is reported to the police.
Described button 51 is power switch key, and button 52 is function key, and function key sets for function and selects the metal types to be detected preset.
Described alarm unit 70 comprises Multicolor LED lamp light crossing-signal 71 and buzzerphone alarm apparatus 72.When detecting special metal in detection process,
Multicolor LED lamp light crossing-signal 71 sends warning lamplight pointing, and buzzerphone alarm apparatus 72 sends alarm sound instruction, and prompting safety inspector notes simultaneously.
Obviously, above-described embodiment of this patent is only for clearly demonstrating this patent example, and is not the embodiment to this patent
Limit.Can also make other changes in different forms on the basis of the above description, here without also all of embodiment being given
With exhaustive.Any amendment, equivalent and the improvement etc. made within all spirit at this patent and principle, should be included in patent claims
Protection domain within.
Claims (9)
1. a hand-held special metal detector, the search coil including housing and being arranged in housing, control chip, alarm unit, signal are sent out
Raw circuit, signal acquisition circuit, button and power supply, described housing forms interconnective detecting area, component region and handle region, described search coil
It is arranged on described detecting area, it is characterised in that described search coil includes that the big coil of architectural difference and little coil, described big coil and little coil are positioned at
In same plane, described little coil is arranged on described big coil inside zone line.
Hand-held special metal detector the most according to claim 1, it is characterised in that described big coil includes transmitting coil, described little coil
Including feedback coil；Or described big coil includes that feedback coil, described little coil include that transmitting coil, described receiving coil are arranged on described big coil
Or on little coil.
Hand-held special metal detector the most according to claim 1, it is characterised in that described big coil and little coil all include receiving coil,
Described transmitting coil is arranged on described big coil or little coil.
4. according to the hand-held special metal detector described in any one of claim 2 to 3, it is characterised in that described signal generating circuit includes successively
The first filter circuit, shaping circuit, the first amplifying circuit and the drive circuit connected, described filter circuit connects control chip, described drive circuit
Connect transmitting coil or feedback coil.
5. according to the hand-held special metal detector described in any one of claim 2 to 3, it is characterised in that described signal acquisition circuit includes successively
Frequency-selecting pre-arcing road, the second filter circuit and the second amplifying circuit connected, described frequency-selecting pre-arcing road connects receiving coil, and described second amplifies electricity
Road connects control chip.
Hand-held special metal detector the most according to claim 5, it is characterised in that described control chip is provided with analog to digital conversion circuit, described
Analog to digital conversion circuit connects the second amplifying circuit.
Hand-held special metal detector the most according to claim 5, it is characterised in that described control chip is additionally provided with for storing metal warning
The database storage unit of electrical signal data data.
8. according to the hand-held special metal detector described in any one of claims 1 to 3, it is characterised in that also include Power Management Unit, described
Power Management Unit is connected with described power supply.
9. according to the hand-held special metal detector described in any one of claims 1 to 3, it is characterised in that described alarm unit includes multi-colored led
One or more in visual alarm, buzzerphone alarm apparatus or vibration alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610177250.1A CN105891893A (en) | 2016-03-28 | 2016-03-28 | Hand-held specific metal detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610177250.1A CN105891893A (en) | 2016-03-28 | 2016-03-28 | Hand-held specific metal detector |
Publications (1)
| Publication Number | Publication Date |
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| CN105891893A true CN105891893A (en) | 2016-08-24 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610177250.1A Pending CN105891893A (en) | 2016-03-28 | 2016-03-28 | Hand-held specific metal detector |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107831547A (en) * | 2017-09-22 | 2018-03-23 | 永康市卓图工贸有限公司 | The method that a kind of metal detector and metal detector compensate to its detection coil |
| CN108227021A (en) * | 2018-02-09 | 2018-06-29 | 李法利 | Rays safety detection apparatus |
| CN108318075A (en) * | 2018-02-09 | 2018-07-24 | 李法利 | The control circuit of safety check apparatus |
| CN108398723A (en) * | 2018-02-09 | 2018-08-14 | 李法利 | Detection method for detecting electronic product |
| CN108398724A (en) * | 2018-02-09 | 2018-08-14 | 李法利 | waveform detection circuit |
| CN110379534A (en) * | 2019-07-11 | 2019-10-25 | 中国科学院上海应用物理研究所 | The method of 1 magnetic field point is formed in septum magnet and septum magnet |
| CN114391996A (en) * | 2021-12-27 | 2022-04-26 | 广州星际悦动股份有限公司 | Electric toothbrush handle and electric toothbrush |
| RU215357U1 (en) * | 2022-06-10 | 2022-12-09 | Вячеслав Михайлович Фоминых | Wireless metal detector based on the principle of a digital frequency meter |
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| CN201000486Y (en) * | 2006-04-12 | 2008-01-02 | 许凯 | Through type metal detection door |
| CN201110898Y (en) * | 2007-10-15 | 2008-09-03 | 深圳市赛时特科技有限公司 | Duct type synthetic safety detecting door |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107831547A (en) * | 2017-09-22 | 2018-03-23 | 永康市卓图工贸有限公司 | The method that a kind of metal detector and metal detector compensate to its detection coil |
| CN108227021A (en) * | 2018-02-09 | 2018-06-29 | 李法利 | Rays safety detection apparatus |
| CN108318075A (en) * | 2018-02-09 | 2018-07-24 | 李法利 | The control circuit of safety check apparatus |
| CN108398723A (en) * | 2018-02-09 | 2018-08-14 | 李法利 | Detection method for detecting electronic product |
| CN108398724A (en) * | 2018-02-09 | 2018-08-14 | 李法利 | waveform detection circuit |
| CN110379534A (en) * | 2019-07-11 | 2019-10-25 | 中国科学院上海应用物理研究所 | The method of 1 magnetic field point is formed in septum magnet and septum magnet |
| CN114391996A (en) * | 2021-12-27 | 2022-04-26 | 广州星际悦动股份有限公司 | Electric toothbrush handle and electric toothbrush |
| RU215357U1 (en) * | 2022-06-10 | 2022-12-09 | Вячеслав Михайлович Фоминых | Wireless metal detector based on the principle of a digital frequency meter |
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