CN107219557A - A kind of low-intensity magnetic field detection method and system - Google Patents
A kind of low-intensity magnetic field detection method and system Download PDFInfo
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- CN107219557A CN107219557A CN201710549198.2A CN201710549198A CN107219557A CN 107219557 A CN107219557 A CN 107219557A CN 201710549198 A CN201710549198 A CN 201710549198A CN 107219557 A CN107219557 A CN 107219557A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
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Abstract
The invention discloses a kind of low-intensity magnetic field detection method and system, the problem of to solve rate of false alarm and rate of failing to report high of the existing detecting devices to eavesdropping burglary equipment.This method includes：S1, the magnetic field signal for obtaining the microphone for eavesdropping burglary equipment are simultaneously converted into electric signal；S2, analyze and handle the electric signal；S3, judge whether the electric signal matches with the default electric signal of database, if so, being determined as prohibited items.Using the present invention, eavesdropping burglary equipment can be distinguished, reduces rate of false alarm, reduction and fails to report, user's request is met conscientiously.
Description
Technical field
The present invention relates to Articles detecting technical field, more particularly to a kind of low-intensity magnetic field detection method and system.
Background technology
With socio-economic development, the popularization of intelligent electronic device is more and more using the user of intelligent electronic device, body
Understand its bring convenience with it is quick while, there is also very big potential safety hazard.At present, intelligent electronic device, which is divulged a secret, turns into new
Approach of divulging a secret, be a great potential safety hazard.
Government organs' divulge a secret place, military project of place, military establishment of divulging a secret is divulged a secret place, and intelligent electronic device is divulged a secret thing
Part is increasingly frequent, though being required to carrying intelligent electronic device entrance, conveniently technological means can be to that may let out for shortage
Close terminal is checked and spot-check.The place of the mechanism such as Examination Yuan, prison system communication apparatus, due to lacking to communication tool
The means of detection, violation event is difficult to investigate and prosecute, found.
As long as existing metal detection device run into metal will alarm, no matter wrist-watch, belt, button etc. are not added with
Distinguish, rate of false alarm is high, causes user to can't bear to stand, determine to abandon.
Some detecting devices are also only able to detect the intelligent electronic device under open state, mobile phone shutdown, removal battery
Or can not be detected in the state of removal SIM card.
Now it is badly in need of to metal detection rays safety detection apparatus function upgrading, for eavesdropping burglary equipment detection, reduces rate of false alarm, reduction
Rate of failing to report.
Publication No. CN204116622U patent discloses a kind of novel security inspection door.Using multiple fluxgate sensors,
Detect electronic product and the metal class articles such as mobile phone, computer, wireless receiving and transmitting apparatus.The detector gate can detect ferromagnetism thing
Body, permanent magnetism object and the equipment alived, but according to the technical principle and method of the patent, can only be according to maximum magnetic flux field strength
Degree sets out alarm, but can not further analyze the size of measured object, shape, the information such as position and magnetic field feature, thus, it is impossible to root
Factually border detection demand distinguishes the various objects that there is Weak magentic-field.Inevasible high wrong report is had according to the technical principle
The problems such as rate.
The content of the invention
The technical problem to be solved in the present invention purpose is to provide a kind of low-intensity magnetic field detection method and system, existing to solve
Some detecting devices are to eavesdropping the rate of false alarm of burglary equipment and the problem of high rate of failing to report.
To achieve these goals, the technical solution adopted by the present invention is：
A kind of low-intensity magnetic field detection method, including step：
S1, the magnetic field signal for obtaining the microphone for eavesdropping burglary equipment are simultaneously converted into electric signal；
S2, analyze and handle the electric signal；
S3, judge whether the electric signal matches with the default electric signal of database, if so, being determined as prohibited items.
Further, step S2 is specifically included：
Conditioning is filtered to the electric signal using multi-stage operational amplifier；
Enter Mobile state to the amplitude of the electric signal using Programmable Gain Amplifier Circuit to adjust；
The electric signal after adjustment is acquired using A-D converter；
Data analysis is carried out to the electric signal of the collection.
Further, in addition to step：
The electric signal being converted to according to preset algorithm to the magnetic field signal of a variety of prohibited items is learnt and is stored in
In database.
Further, in addition to step：
Background noise in collecting and detecting device pre-determined distance is simultaneously stored in database.
Further, in addition to step：
Detect after prohibited items, show the positional information of prohibited items.
A kind of weak magnetic field detection system, including：
Acquisition module, for obtaining the magnetic field signal for the microphone for eavesdropping burglary equipment and being converted into electric signal；
Processing module, for analyzing and handling the electric signal；
Judge module, for judging whether the electric signal matches with the default electric signal of database, if so, being judged to disobeying
Prohibited cargo product.
Further, the processing module is specifically included：
Filter unit, for being filtered conditioning to the electric signal using multi-stage operational amplifier；
AM unit, is adjusted for entering Mobile state to the amplitude of the electric signal using Programmable Gain Amplifier Circuit；
Collecting unit, for being acquired using A-D converter to the electric signal after adjustment；
Analytic unit, data analysis is carried out for the electric signal to the collection.
Further, in addition to：
Study module, the electric signal for being converted to according to preset algorithm to the magnetic field signal of a variety of prohibited items is carried out
Learn and be stored in database.
Further, in addition to：
Detection module, for the background noise in collecting and detecting device pre-determined distance and is stored in database.
Further, in addition to：
Locating module, for detecting after prohibited items, shows the positional information of prohibited items.
It is of the invention compared with traditional technology, have the following advantages：
Using the present invention, eavesdropping burglary equipment can be distinguished, reduces rate of false alarm, reduction and fails to report, user's request is met conscientiously.
Brief description of the drawings
Fig. 1 is a kind of low-intensity magnetic field detection method flow chart that embodiment one is provided；
Fig. 2 is a kind of weak magnetic field detection system structure chart that embodiment one is provided；
Fig. 3 is a kind of low-intensity magnetic field detection method flow chart that embodiment two is provided；
Fig. 4 is a kind of weak magnetic field detection system structure chart that embodiment two is provided；
Fig. 5 is a kind of low-intensity magnetic field detection method flow chart that embodiment three is provided；
Fig. 6 is a kind of weak magnetic field detection system structure chart that embodiment three is provided；
Fig. 7 is a kind of low-intensity magnetic field detection method flow chart that example IV is provided；
Fig. 8 is a kind of weak magnetic field detection system structure chart that example IV is provided.
Embodiment
The following is specific embodiment of the invention and with reference to accompanying drawing, technical scheme is further described,
But the present invention is not limited to these embodiments.
Embodiment one
A kind of low-intensity magnetic field detection method is present embodiments provided, as shown in figure 1, including step：
S11：Obtain the Magnetic Field of the microphone of eavesdropping burglary equipment and be converted into electric signal；
S12：Analyze and handle electric signal；
S13：Judge whether electric signal matches with the default electric signal of database, if so, being determined as prohibited items.
The low-intensity magnetic field detection method that the present embodiment is provided, it is main to use Magnetic Sensor induced field principle, by magnetic field signal
Electric signal is converted to, is analyzed further according to preset algorithm, the object entrained by tested personnel is judged, and accurately tells and is
The eavesdropping burglary equipment containing microphone such as no carrying mobile phone.
In the prior art, the article with metal is mainly detected using safety check detection door, also has some mobile phone detectors
The mobile phone under open state is only able to detect, and the difference of the detection means of the present embodiment and conventional art is, is being detected
When personnel pass through door body, no matter intelligent electronic device is in start, shutdown, intelligence that is standby, removing battery or removal SIM card
It can be detected under the states such as electronic equipment.
In the present embodiment, step S11 eavesdrops the Magnetic Field of the microphone of burglary equipment for acquisition and is converted into electric signal.
Traditional detection method is article of the detection with metal, is detected the things such as key, belt, glasses that personnel carry
Product can all be judged as doubtful prohibited items.The present embodiment is determined whether there is by detecting the microphone of eavesdropping burglary equipment
Prohibited items.
All contain magnet in the eavesdropping burglary equipment such as mobile phone, recording pen, changes of magnetic field is detected using Magnetic Sensor, can be to stealing
Burglary equipment is listened to be detected.
Traditional detection method direct detection magnetic field signal, the method for the present embodiment is that magnetic field signal is converted into telecommunications
Number.
In the present embodiment, step S12 is analysis and handles electric signal.Specifically include step：
Conditioning is filtered to electric signal using multi-stage operational amplifier；
Enter Mobile state to the amplitude of electric signal using Programmable Gain Amplifier Circuit to adjust；
The electric signal after adjustment is acquired using magic converter；
Data analysis is carried out to the electric signal of collection.
Specifically, getting after the Magnetic Field of the microphone of eavesdropping burglary equipment, realize that high frequency is made an uproar using analog circuit
The amplification filtered out with more than 80dB gains of sound.Inherently a kind of silent, passive collection of magnetic signal acquisition device, does not launch and appoints
What signal.
Filtering modulate circuit is filtered conditioning to signal using three-stage operational amplifier；Use programmable automation controller electricity
Mobile state adjustment is entered on road to signal amplitude；Data are acquired using 16 A-D converters (ADC)；A-D converter
(ADC) data volume of collection is than larger, and data analysis component is handled using Digital Signal Processing (DSP).
In the present embodiment, step S13 is judges whether electric signal matches with the default electric signal of database, if so, judging
For prohibited items.
The detection means of the present embodiment is analysed and compared alarm software two parts group by leading portion data acquisition unit and back-end data
Into.The electric signal of database purchase is the electric signal that is converted to of magnetic field signal of prohibited items.If the magnetic of the article detected
The electric signal of field signal conversion is matched with the default electric signal of database, is determined as prohibited items.It is convenient and swift, more accurately.
The present embodiment additionally provides a kind of weak magnetic field detection system, as shown in Fig. 2 including：
Acquisition module 21, for obtaining the Magnetic Field for the microphone for eavesdropping burglary equipment and being converted into electric signal；
Processing module 22, for analyzing and handling electric signal；
Judge module 23, for judging whether electric signal matches with the default electric signal of database, if so, being determined as violated
Article.
In the present embodiment, acquisition module 21 is used to obtain the Magnetic Field of the microphone of eavesdropping burglary equipment and is converted into electricity
Signal.
All contain magnet in the eavesdropping burglary equipment such as mobile phone, recording pen, changes of magnetic field is detected using Magnetic Sensor, can be to stealing
Burglary equipment is listened to be detected.The present embodiment is to determine whether there is violated thing by detecting the microphone of eavesdropping burglary equipment
Product.
Traditional detection method direct detection magnetic field signal, the method for the present embodiment is that magnetic field signal is converted into telecommunications
Number.
In the present embodiment, processing module 22 is analysis and handles electric signal.Specifically include：
Filter unit, for being filtered conditioning to electric signal using multi-stage operational amplifier；
AM unit, is adjusted for entering Mobile state to the amplitude of electric signal using Programmable Gain Amplifier Circuit；
Collecting unit, for being acquired using magic converter to the electric signal after adjustment；
Analytic unit, data analysis is carried out for the electric signal to collection.
Specifically, getting after the Magnetic Field of the microphone of eavesdropping burglary equipment, realize that high frequency is made an uproar using analog circuit
The amplification filtered out with more than 80dB gains of sound.Inherently a kind of silent, passive collection of magnetic signal acquisition device, does not launch and appoints
What signal.
Filtering modulate circuit is filtered conditioning to signal using three-stage operational amplifier；Use programmable automation controller electricity
Mobile state adjustment is entered on road to signal amplitude；Data are acquired using 16 A-D converters (ADC)；A-D converter
(ADC) data volume of collection is than larger, and data analysis component is handled using Digital Signal Processing (DSP).
In the present embodiment, judge module 23 is judges whether electric signal matches with the default electric signal of database, if so, sentencing
It is set to prohibited items.
If specifically, the article detected magnetic field signal conversion electric signal matched with the default electric signal of database,
It is determined as prohibited items.It is convenient and swift, more accurately.
Embodiment two
A kind of low-intensity magnetic field detection method is present embodiments provided, as shown in figure 3, including step：
S31：The electric signal being converted to according to preset algorithm to the magnetic field signal of a variety of prohibited items is learnt and deposited
It is stored in database；
S32：Obtain the Magnetic Field of the microphone of eavesdropping burglary equipment and be converted into electric signal；
S33：Analyze and handle electric signal；
S34：Judge whether electric signal matches with the default electric signal of database, if so, being determined as prohibited items.
It is with the difference of embodiment one, in addition to step S31.
The detection means of the present embodiment is made up of front end data acquisition device and background data base alarm software of analysing and comparing, and is
The third generation low-intensity magnetic field detection product of cash.
Background data base analyses and comparison alarm software is provided with advanced intelligent algorithm.First gather microphone on the market
Magnetic field signal, learns according to the electric signal that preset algorithm is converted to the magnetic field signal of a variety of microphones.After learning
Electric signal be stored in database.The species of magnetic field signal kind analogy intelligent electronic device due to microphone etc. is few, therefore
The magnetic field signal for gathering microphone is simpler more easy to operate than collection intelligent electronic device.
The present embodiment additionally provides a kind of weak magnetic field detection system, as shown in figure 4, including：
Study module 41, the electric signal for being converted to according to preset algorithm to the magnetic field signal of a variety of prohibited items enters
Row learns and is stored in database；
Acquisition module 42, for obtaining the Magnetic Field for the microphone for eavesdropping burglary equipment and being converted into electric signal；
Processing module 43, for analyzing and handling electric signal；
Judge module 44, for judging whether electric signal matches with the default electric signal of database, if so, being determined as violated
Article.
The present embodiment is with the difference of embodiment one, in addition to study module 41.
Specifically, the electric signal being converted to according to preset algorithm to the magnetic field signal of a variety of microphones learns.Will
Electric signal after study is stored in database.Constantly the accuracy rate of lifting detection device, it also avoid failing to report the situation of wrong report.
Embodiment three
This implementation provides a kind of low-intensity magnetic field detection method, as shown in figure 5, including step：
S51：The electric signal being converted to according to preset algorithm to the magnetic field signal of a variety of prohibited items is learnt and deposited
It is stored in database；
S52：Background noise in collecting and detecting device pre-determined distance is simultaneously stored in database；
S53：Obtain the Magnetic Field of the microphone of eavesdropping burglary equipment and be converted into electric signal；
S54：Analyze and handle electric signal；
S55：Judge whether electric signal matches with the default electric signal of database, if so, being determined as prohibited items.
The present embodiment is with embodiment one, two differences, in addition to step S52.
Wherein, background noise is also known as ambient noise, refers to the overall noise in addition to useful signal in electroacoustics system：Including sound
Ring noise of equipment and playback ambient noise two parts." rustling " sound in such as TV sound in addition to broadcast sounds etc..
Too strong background noise, can not only make one irritated, also flood detail section weaker in sound, make the noise of sound
Than reducing with dynamic range, reproduced sound quality is destroyed.
Device for detecting rock is unable to during background noise is gathered, surrounding ferromagnetism object can not be rocked again, otherwise can
The increase collection deadline.
Gather this Earth noise to be stored in database, can more accurately be judged to eavesdrop burglary equipment according to algorithm.
This implementation additionally provides a kind of weak magnetic field detection system, as shown in fig. 6, including：
Study module 61, the electric signal for being converted to according to preset algorithm to the magnetic field signal of a variety of prohibited items enters
Row learns and is stored in database；
Detection module 62, for the background noise in collecting and detecting device pre-determined distance and is stored in database；
Acquisition module 63, for obtaining the Magnetic Field for the microphone for eavesdropping burglary equipment and being converted into electric signal；
Processing module 64, for analyzing and handling electric signal；
Judge module 65, for judging whether electric signal matches with the default electric signal of database, if so, being determined as violated
Article.
It is with embodiment one, two differences, in addition to detection module 62.
It is stored in specifically, gathering this Earth noise in database, can more accurately judges that eavesdropping is stolen according to algorithm
Depending on equipment.
Example IV
A kind of low-intensity magnetic field detection method is present embodiments provided, as shown in fig. 7, comprises step：
S71：The electric signal being converted to according to preset algorithm to the magnetic field signal of a variety of prohibited items is learnt and deposited
It is stored in database；
S72：Background noise in collecting and detecting device pre-determined distance is simultaneously stored in database；
S73：Obtain the Magnetic Field of the microphone of eavesdropping burglary equipment and be converted into electric signal；
S74：Analyze and handle electric signal；
S75：Judge whether electric signal matches with the default electric signal of database, if so, being determined as prohibited items；
S76：Detect after prohibited items, show the positional information of prohibited items.
It is with the difference of embodiment one, two, three, in addition to step S76.
The present embodiment can send alarm after prohibited items are detected.
For example：Green indicating lamp is lighted during detection means normal work, and red led extinguishes, people's P Passable；If inspection
Prohibited items are measured, red led is for lighting and sending alarm.
By double side probing, it can accurately judge to eavesdrop the position of burglary equipment.Detection means has power model, tune
The characteristics of making digitlization, weak magnetic detection, height precisely, prohibited items locating alarming is realized based on being detected to low-intensity magnetic field.Can not only
Particular location can also be detected by being detected with prohibited items.
The present embodiment additionally provides a kind of weak magnetic field detection system, as shown in figure 8, including：
Study module 81, the electric signal for being converted to according to preset algorithm to the magnetic field signal of a variety of prohibited items enters
Row learns and is stored in database；
Detection module 82, for the background noise in collecting and detecting device pre-determined distance and is stored in database；
Acquisition module 83, for obtaining the Magnetic Field for the microphone for eavesdropping burglary equipment and being converted into electric signal；
Processing module 84, for analyzing and handling electric signal；
Judge module 85, for judging whether electric signal matches with the default electric signal of database, if so, being determined as violated
Article；
Locating module 86:, for detecting after prohibited items, show the positional information of prohibited items.
It is with the difference of embodiment one, two, three, in addition to locating module 86.
Specifically, by double side probing, can accurately judge to eavesdrop the position of burglary equipment.Can not only detect against
Prohibited cargo product can also detect particular location.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology neck belonging to of the invention
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Claims (10)
1. a kind of low-intensity magnetic field detection method, it is characterised in that including step：
S1, the magnetic field signal for obtaining the microphone for eavesdropping burglary equipment are simultaneously converted into electric signal；
S2, analyze and handle the electric signal；
S3, judge whether the electric signal matches with the default electric signal of database, if so, being determined as prohibited items.
2. a kind of low-intensity magnetic field detection method according to claim 1, it is characterised in that step S2 is specifically included：
Conditioning is filtered to the electric signal using multi-stage operational amplifier；
Enter Mobile state to the amplitude of the electric signal using Programmable Gain Amplifier Circuit to adjust；
The electric signal after adjustment is acquired using A-D converter；
Data analysis is carried out to the electric signal of the collection.
3. a kind of low-intensity magnetic field detection method according to claim 1, it is characterised in that also including step：
The electric signal being converted to according to preset algorithm to the magnetic field signal of a variety of prohibited items is learnt and is stored in data
In storehouse.
4. a kind of low-intensity magnetic field detection method according to claim 1, it is characterised in that also including step：
Background noise in collecting and detecting device pre-determined distance is simultaneously stored in database.
5. a kind of low-intensity magnetic field detection method according to claim 1, it is characterised in that also including step：
Detect after prohibited items, show the positional information of prohibited items.
6. a kind of weak magnetic field detection system, it is characterised in that including：
Acquisition module, for obtaining the magnetic field signal for the microphone for eavesdropping burglary equipment and being converted into electric signal；
Processing module, for analyzing and handling the electric signal；
Judge module, for judging whether the electric signal matches with the default electric signal of database, if so, being determined as violated thing
Product.
7. a kind of weak magnetic field detection system according to claim 6, it is characterised in that the processing module is specifically included：
Filter unit, for being filtered conditioning to the electric signal using multi-stage operational amplifier；
AM unit, is adjusted for entering Mobile state to the amplitude of the electric signal using Programmable Gain Amplifier Circuit；
Collecting unit, for being acquired using A-D converter to the electric signal after adjustment；
Analytic unit, data analysis is carried out for the electric signal to the collection.
8. a kind of weak magnetic field detection system according to claim 6, it is characterised in that also include：
Study module, the electric signal for being converted to according to preset algorithm to the magnetic field signal of a variety of prohibited items learns
And be stored in database.
9. a kind of weak magnetic field detection system according to claim 6, it is characterised in that also include：
Detection module, for the background noise in collecting and detecting device pre-determined distance and is stored in database.
10. a kind of weak magnetic field detection system according to claim 6, it is characterised in that also include：
Locating module, for detecting after prohibited items, shows the positional information of prohibited items.
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| CN105403922A (en) * | 2015-12-18 | 2016-03-16 | 北京航星机器制造有限公司 | Weak magnetic detection method |
| CN105467456A (en) * | 2015-12-18 | 2016-04-06 | 北京航星机器制造有限公司 | Communication recording device detection door based on knowledge base |
| CN105467457A (en) * | 2015-12-18 | 2016-04-06 | 北京航星机器制造有限公司 | Communication recording device detection door based on magnetic sensor |
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|---|---|---|---|---|
| CN200989924Y (en) * | 2006-02-08 | 2007-12-12 | 黑龙江大学 | Wireless hidden earphone detector for examination cheating |
| CN103630853A (en) * | 2013-08-20 | 2014-03-12 | 中国科学院电子学研究所 | Inductive magnetic field sensor |
| CN105403922A (en) * | 2015-12-18 | 2016-03-16 | 北京航星机器制造有限公司 | Weak magnetic detection method |
| CN105467456A (en) * | 2015-12-18 | 2016-04-06 | 北京航星机器制造有限公司 | Communication recording device detection door based on knowledge base |
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