CN108415088A - Waveforms detection method based on metal detection - Google Patents
Waveforms detection method based on metal detection Download PDFInfo
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- CN108415088A CN108415088A CN201810131633.4A CN201810131633A CN108415088A CN 108415088 A CN108415088 A CN 108415088A CN 201810131633 A CN201810131633 A CN 201810131633A CN 108415088 A CN108415088 A CN 108415088A
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- 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
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Abstract
The waveforms detection method based on metal detection that the present embodiments relate to a kind of, including：Control unit exports alternating current according to enabled instruction to magnet exciting coil；Magnet exciting coil exports excitation voltage according to alternating current to induction coil group；Induction coil group is set in magnet exciting coil, and induction coil group exports electromagnetic field according to excitation voltage；When metal object is by induction coil group, electromagnetic field changes；Induction coil group generates probe current according to the electromagnetic field after variation, and electrical measurement electric current is sent to control unit；Control unit parses probe current, generates prompt message according to analysis result, and show.The embodiment of the present invention provides the waveforms detection method based on metal detection, can accurately judge the carrying position of detected object, the areas search coverage Nei Ruo and blind area be eliminated, so that metal detection is more efficient.
Description
Technical field
The present invention relates to metal detection technical field more particularly to a kind of waveforms detection methods based on metal detection.
Background technology
With the development of society, safety problem has been to be concerned by more and more people.Whether airport, station, subway, discrepancy
Border, law court, prison, narcotic house, detention house, hospital, school, large-scale deduction venue, important international conference, international exhibitions etc., it is right
The safety check of visitor is all essential.So-called safety check exactly checks passenger or spectators by certain technological means and facility
Whether gun, cutter, ammunition and inflammable and explosive dangerous goods etc. are carried, to intercept possible security risk, pre- anti-violence
Crime or the generation of accident.
Existing safety check apparatus is investigated one by one generally by hand-held detector, to visitor, and safety check efficiency is low.Separately
A kind of mode is by gate or detector gate, and the metal carried to people is detected alarm.But existing gate
Or detector gate, there are certain detection blind areas and weak area, and sensitivity is not high, and performance is also not sufficiently stable.
Invention content
The waveforms detection method based on metal detection that the object of the present invention is to provide a kind of is divided according to human body basic structure
At overlapped netted search coverage, detection is interacted in such a way that multigroup induction coil is set and is detected object, it can be accurate
Judgement is detected the carrying position of object, the areas search coverage Nei Ruo and blind area is eliminated, so that metal detection is more efficient.
To achieve the above object, the waveforms detection method based on metal detection that the present invention provides a kind of, including：
Control unit exports alternating current according to enabled instruction to magnet exciting coil；
The magnet exciting coil exports excitation voltage according to the alternating current to induction coil group；
The induction coil group is set in the magnet exciting coil, and the induction coil group is exported according to the excitation voltage
Electromagnetic field；
When metal object is by the induction coil group, the electromagnetic field changes；The induction coil group according to
Electromagnetic field after variation generates probe current, and the electrical measurement electric current is sent to described control unit；
Described control unit parses the probe current, generates prompt message according to the analysis result, and show.
Preferably, the magnet exciting coil includes the first magnet exciting coil and the second magnet exciting coil；In first magnet exciting coil
It is provided with the first induction coil group, the second induction coil group is provided in second magnet exciting coil.
It is further preferred that the induction coil group is specially according to excitation voltage output electromagnetic field：
The first induction coil group exports the first electromagnetic field according to the excitation voltage；The second induction coil group root
The second electromagnetic field is exported according to the excitation voltage；
First electromagnetic field crosses with second electromagnetic field, and the space exploration of the first electromagnetic field is more than described second
The space exploration of electromagnetic field.
It is further preferred that the first induction coil group and the second induction coil group are five groups of induction coils.
It is further preferred that described be specially according to electromagnetic field generation probe current：
The first induction coil group and the second induction coil group according to the electromagnetic field generate ten groups described in detect
Electric current；Probe current described in every group includes induction coil position data.
It is further preferred that the prompt message includes the induction coil position data.
A kind of waveforms detection method based on metal detection provided by the invention, phase mutual respect is divided into according to human body basic structure
Folded netted search coverage interacts detection by way of multigroup induction coil is arranged and is detected object, can accurately judge to be visited
The carrying position of object is surveyed, the areas search coverage Nei Ruo and blind area are eliminated, so that metal detection is more efficient.
Description of the drawings
Fig. 1 is the method flow diagram of the waveforms detection method provided in an embodiment of the present invention based on metal detection；
Fig. 2 is the circuit diagram of amplifying circuit provided in an embodiment of the present invention；
Fig. 3 is the partial structural diagram of magnet exciting coil and induction coil group.
Specific implementation mode
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
The method of waveforms detection method provided in an embodiment of the present invention based on metal detection is, it can be achieved that in for various peaces
It examines in equipment detection, passes through whether the object of rays safety detection apparatus is metal product for detecting.Fig. 1 is provided in an embodiment of the present invention
The method flow diagram of waveforms detection method based on metal detection, as shown in Figure 1, provided in an embodiment of the present invention visited based on metal
The waveforms detection method of survey includes following steps.
Step 110, control unit sends alternating current according to the enabled instruction of user to magnet exciting coil；
Specifically, control unit can be understood as a set of control circuit, it is responsible for the execution of entire circuit.Control unit includes
Central processing unit, signal generator and the first amplifying circuit.Central processing unit is sent out according to enabled instruction input by user to signal
Raw device sends enabling signal so that signal generator generates alternating current according to enabling signal.
The alternating current of the generation of signal generator needs to amplify current strength by the first amplifying circuit.First amplification electricity
The premiere feature on road is to improve signal-to-noise ratio as far as possible so that amplified alternating current can generate stable detection magnetic field.
In a specific example, the first amplifying circuit uses AD620 instrument amplifiers.The signal being made of AD620
Amplifying circuit is as shown in Fig. 2, signal amplification circuit includes that signal input part 1, electric wire ground terminal 2, resistance branch end 3 and signal are defeated
Outlet 4, alternating current are inputted by signal input part 1, amplified to be exported again by signal output end 4.Three poles of signal input part 1
Pipe provides simple differential bipolar input and keeps the collector current of input triode by the feedback of amplifier inside input stage
It is constant, and input voltage is made to be added on external gain control resistance R.Because AD620 design volumes are small, power consumption is very low, thus suitable
For low-voltage, the application scenario of low-power consumption.
Step 120, magnet exciting coil generates detection magnetic field according to alternating current；
It is encouraged according to electromagnetic induction principle specifically, the first amplifying circuit exports amplified alternating current to magnet exciting coil
Magnetic coil generates detection magnetic field according to amplified alternating current.This process can be understood as the process of electric magnetisation.
Step 130, induction coil group generates detection data according to the variation in detection magnetic field, and detection data is sent to control
Unit processed；
Specifically, induction coil group is set to the inside of magnet exciting coil, when metal product is by detecting magnetic field, magnetic is detected
Change, induction coil group experiences the variation of sine wave in detection magnetic field by magnetic-coupled mode, and according to variation after
Detection magnetic field generate the first detection data.Detection data can be understood as voltage and or current analog signal.This process can
To be interpreted as the process of magnetic life electricity.
Specifically, Fig. 3 is the partial structural diagram of magnet exciting coil and induction coil group, as shown in figure 3, induction coil group
1 is set to the inside of magnet exciting coil 2, and induction coil group 2 includes the first induction coil 2a and the second induction coil 2b.First induction
Coil 2a and the second induction coil 2b differential concatenations so that the first electromotive force caused by the first induction coil 2a and the second induction
The second electromotive force is equal in magnitude caused by coil 2b and direction is opposite.
Ideally, since the first induction coil 2a is identical as the electromotive force size of the second induction coil 2b, but phase
On the contrary, so the voltage of induction coil group output, which can be regarded as, levels off to zero.When there is electronic product to pass through magnet exciting coil, magnetic is detected
Field changes, and leads to the electromotive force of the first induction coil 2a and the second induction coil 2b not rebalancing, to there is voltage output,
Generate the first detection data.
Step 140, control unit carries out signal enhanced processing and filtration treatment to detection data；
Specifically, control unit further includes first filter, the second amplifying circuit, analog-digital converter and second filter.
Since waveform detection circuit is worked using electromagnetic field, and the distracter of electromagnetic field is extremely complex, and interference may
Come from circuit surrounding enviroment, it is also possible to come from circuit itself, so it is inevitable to be filtered.Therefore, induction coil
Group needs the first detection data being sent to first filter, after the first detection data of first filter pair is filtered,
Obtain the second detection data.
Since after being once filtered, entrained signal message opposite can reduce in the second detection data, so
It after being once filtered, is needing to carry out a signal enhanced processing again.Therefore, first filter needs to visit second
Measured data is sent to the second amplifying circuit, and second the second detection data of amplifying circuit pair carries out multi-level differential enhanced processing, putting
While big signal, signal noise is further decreased.After first the second detection data of amplifying circuit pair is filtered, obtain
Third detection data obtains third detection data.At this point, third detection data is still voltage and or current analog signal.
Since voltage and or current signal data cannot be directly subsequently can by computer, to third detection data into
Before row processing, need to convert third detection data to digital signal.Therefore, the first amplifying circuit is needed third detection data
It is sent to analog-digital converter.Analog-digital converter carries out analog-to-digital conversion process to third detection data, obtains the 4th detection data.The
Four detection datas can be understood as the digital signal that can be readable by a computer, handle.
The conversion accuracy and conversion speed of analog-digital converter determine the attainable accuracy and speed of circuit institute, although alternation is electric
It is direct current tempolabile signal to flow signal, but analog-digital converter needs enough conversion accuracies.Therefore, what analog-digital converter was selected turns
It need to be multrirange, two channels, 12 high-precision conversion chips to change chip.Wherein, two channels are for collecting in induction coil group
The signal of the first induction coil and the second induction coil of same level position.
Step 150, control unit parses detection data, obtains waveform phase angular data；
Specifically, third detection data, after analog-to-digital conversion, into Digital Signal Processing link, second filter needs
First the 4th detection data is parsed, and resolving can be understood as the process of digital signal filter processing.It needs to illustrate
, what first filter was carried out be filtered being filtered for analog signal, and the filtering that second filter is carried out
Processing is being filtered for digital signal.
Further specifically, the 4th detection data is sent to second filter by analog-digital converter, second filter is first
The 4th detection data in timing statistics is sampled, multiple 4th detection datas are obtained.Then, second filter is to multiple
4th detection data group carries out mean value calculation, obtains the average wave number of the 4th detection data.The average wave number of 4th detection data
Including waveform phase angular data and wave-shape amplitude data.This process can be understood as the second filter and carry out multiple repairing weld and count
Average filter is calculated, then according to just profound wave processing, extracts the process at its range value and phase angle.
Wherein, waveform phase angular data can be understood as a certain alternating voltage (or spatial position) work sine or remaining at any time
When string changes, a numerical value of alternating voltage amount (or position) state at any one time is determined, it can be according to formula U=Umsin
(ω t+ Φ u) is obtained.U indicates that the virtual value of alternating voltage, Um indicate that the maximum value of the alternating voltage, ω are the angular frequency of alternating current
Rate, t are the time, and Φ u are the initial phases of the alternating voltage, and (ω t+ Φ u) is then phase angle.
Preferably, control unit further includes the first infrared sensor and the second infrared sensor.First infrared sensor and
The time that second infrared sensor is used to determine metal product by induction coil group, that is, second filter pair the 4th detect
The sampling statistics time that data are sampled.When metal product is by the first infrared sensor, starts timing, work as metal product
When by the second infrared sensor, timing terminates.The timing obtained time is timing statistics.
It is further preferred that second filter selects FIR filter (Finite Impulse Response).
Step 160, the waveform phase angular data and preset metal product characteristic parameter are compared, and according to comparing result
Generate prompt message；
Specifically, metal product characteristic parameter can be understood as various metal products produced phase angle in electromagnetic field
Characteristic value.Wave-shape amplitude threshold value can be understood as judging that current examined object generated wave-shape amplitude in electromagnetic field is symbol
The standard of alloy metal products wave-shape amplitude.
Central processing unit determines whether wave-shape amplitude data exceed preset wave-shape amplitude threshold value first, when wave-shape amplitude number
Whether when according to beyond preset wave-shape amplitude threshold value, it is metal product to represent the currently article by safety check apparatus.Then, root
It is by safety check apparatus currently according to location determination of the waveform phase angular data in preset metal product characteristic parameter range
Which kind of metal, and corresponding prompt message is generated according to different metal products, for prompting user currently to pass through safety check
Which kind of metal product the metal product of device is so that user can need to carry out conditional examine according to practical safety check
It looks into.
Preset metal product characteristic parameter includes 0 °, 45 °, 90 °, 120 ° and 180 °.
If wave-shape amplitude data exceed preset wave-shape amplitude threshold value, and waveform phase angle is less than 0 °, then explanation is current
Object by induction coil group is mobile phone, then central processing unit generates the prompt message that prompt current item is electronic product,
And it is prompted to user.
If wave-shape amplitude data exceed preset wave-shape amplitude threshold value, and waveform phase angle is more than or equal to 0 ° and is less than
45 °, then illustrate that currently the object by induction coil group is the metal product similar to tinplate can-like, then central processing unit is given birth to
At the prompt message for the metal product that prompt current item is irony can-like, and it is prompted to user.
If wave-shape amplitude data exceed preset wave-shape amplitude threshold value, and waveform phase angle is more than or equal to 45 ° and is less than
90 °, then illustrate that currently the object by induction coil group is the metal product similar to aluminum tank body shape, then central processing unit is given birth to
At the prompt message for the metal product that prompt current item is aluminum tank body shape, and it is prompted to user.
If wave-shape amplitude data exceed preset wave-shape amplitude threshold value, and waveform phase angle is more than or equal to 90 ° and is less than
120 °, then illustrate that currently the object by induction coil group is the metal product similar to copper tank body shape, then central processing unit
The prompt message for the metal product that prompt current item is copper tank body shape is generated, and is prompted to user.
If wave-shape amplitude data exceed preset wave-shape amplitude threshold value, and waveform phase angle is more than or equal to 120 ° and is less than
180 °, then illustrate that currently the object by induction coil group is the metal product similar to weapons shape, then central processing unit generates
It is the prompt message of the metal product of weapons shape to prompt current item, and is prompted to user.
In one example, prompt message can be the acoustic information of sound amplifying circuit output, when central processing unit is examined
When measuring metal, alarm signal is sent to sound amplifying circuit, sound amplifying circuit exports alarm sound.
In another example, prompt message can be the optical information of light emitting diode output, when central processing unit detects
When to metal, alarm signal is sent to light emitting diode, light emitting diode is into line flicker to alarm.
In another example, prompt message can be the display image information of display screen output, when central processing unit is examined
When measuring metal, alarm signal is sent to display screen, display screen shows the article of alarm, such as knife, mobile phone etc..
The display screen can be liquid crystal display (Liquid Crystal Display, LCD).
In another example, prompt message can be the arbitrary combination of above-mentioned three kinds of situations, to realize type of alarm
Diversification.
Preferably, metal product characteristic parameter and preset wave-shape amplitude threshold value can be that control unit is inputted according to user
Enabled instruction parse.For example, when whether it is cutter that user only need to detect object to be detected, inputted to central processing unit
The enabled instruction of " detection cutter ", then control unit parsed to obtain the metal product feature just for " cutter " according to the instruction
Parameter and preset wave-shape amplitude threshold value.
Alternatively, metal product characteristic parameter and preset wave-shape amplitude threshold value can also be according to different metal products
The data that the experiment of multipass safety check apparatus obtains, and it is pre-stored in control unit local.
It is further preferred that magnet exciting coil and induction coil group can be correspondingly arranged to control two sets, it is respectively used to detection people
Body left area and right area.Induction coil group is provided with five groups altogether, this five groups of induction coil groups in magnet exciting coil
Position, size and arrangement mode are corresponding with the detecting location of human body, are respectively used to detection human body head, chest, waist, big
The region of leg and calf.
Specifically, magnet exciting coil includes being responsible for the first magnet exciting coil of detection human body left area, and it is responsible for detection people
Second magnet exciting coil of body right area is provided with the first induction coil group in the first magnet exciting coil, is set in the second magnet exciting coil
It is equipped with the second induction coil group.First induction coil group includes five groups of induction coil groups, and the first electromagnetism is exported according to excitation voltage
.Second induction coil group equally includes five groups of induction coil groups, and the second electromagnetic field is exported according to excitation voltage.First electromagnetic field
It crosses with the second electromagnetic field and constitutes a complete search coverage, and the first electromagnetic field is responsible for visiting the sky of entire search coverage 2/3
Between, the second electromagnetic field is responsible for visiting the space of entire search coverage 1/3.
That is, induction coil group has ten groups altogether.Every group of generated detection data of induction coil group includes induction
The location information of coil.When central processing unit parses detection data, induction coil location information can also be obtained.Finally, in
Central processor can be determined according to the location information of induction coil and is currently carried and human body by the object of induction coil group
Which position, and user is shown in prompt message.
A kind of waveforms detection method based on metal detection provided in an embodiment of the present invention, is divided into according to human body basic structure
Overlapped netted search coverage interacts detection by way of multigroup induction coil is arranged and is detected object, can accurately sentence
Surely the carrying position of detected object, eliminates the areas search coverage Nei Ruo and blind area, so that metal detection is more efficient.
Professional should further appreciate that, described in conjunction with the examples disclosed in the embodiments of the present disclosure
Unit and algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, hard in order to clearly demonstrate
The interchangeability of part and software generally describes each exemplary composition and step according to function in the above description.
These functions are implemented in hardware or software actually, depend on the specific application and design constraint of technical solution.
Professional technician can use different methods to achieve the described function each specific application, but this realization
It should not be considered as beyond the scope of the present invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can use hardware, processor to execute
The combination of software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only memory
(ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field
In any other form of storage medium well known to interior.
Above-described specific implementation mode has carried out further the purpose of the present invention, technical solution and advantageous effect
It is described in detail, it should be understood that the foregoing is merely the specific implementation mode of the present invention, is not intended to limit the present invention
Protection domain, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (6)
1. a kind of waveforms detection method based on metal detection, which is characterized in that the method includes：
Control unit exports alternating current according to enabled instruction to magnet exciting coil；
The magnet exciting coil exports excitation voltage according to the alternating current to induction coil group；
The induction coil group is set in the magnet exciting coil, and the induction coil group exports electromagnetism according to the excitation voltage
；
When metal object is by the induction coil group, the electromagnetic field changes；The induction coil group is according to variation
Electromagnetic field afterwards generates probe current, and the electrical measurement electric current is sent to described control unit；
Described control unit parses the probe current, generates prompt message according to the analysis result, and show.
2. the waveforms detection method according to claim 1 based on metal detection, which is characterized in that the magnet exciting coil packet
Include the first magnet exciting coil and the second magnet exciting coil；It is provided with the first induction coil group in first magnet exciting coil, described second
The second induction coil group is provided in magnet exciting coil.
3. the waveforms detection method based on metal detection stated according to claim 2, which is characterized in that the induction coil group root
It is specially according to excitation voltage output electromagnetic field：
The first induction coil group exports the first electromagnetic field according to the excitation voltage；The second induction coil group is according to institute
It states excitation voltage and exports the second electromagnetic field；
First electromagnetic field crosses with second electromagnetic field, and the space exploration of the first electromagnetic field is more than second electromagnetism
The space exploration of field.
4. the waveforms detection method according to claim 3 based on metal detection, which is characterized in that first line of induction
Circle group and the second induction coil group are five groups of induction coils.
5. the waveforms detection method according to claim 4 based on metal detection, which is characterized in that described according to the electricity
Magnetic field generates probe current：
The first induction coil group and the second induction coil group according to the electromagnetic field generate ten groups described in probe current；
Probe current described in every group includes induction coil position data.
6. the waveforms detection method according to claim 4 based on metal detection, which is characterized in that the prompt message packet
Include the induction coil position data.
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| CN201810131633.4A CN108415088A (en) | 2018-02-09 | 2018-02-09 | Waveforms detection method based on metal detection |
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| CN201810131633.4A CN108415088A (en) | 2018-02-09 | 2018-02-09 | Waveforms detection method based on metal detection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111580173A (en) * | 2020-06-04 | 2020-08-25 | 山东大学 | Metal object detection sensor and detection device |
| CN112147703A (en) * | 2020-09-25 | 2020-12-29 | 湖北理工学院 | Metal detector |
| CN113835136A (en) * | 2021-09-09 | 2021-12-24 | 国网河北省电力有限公司辛集市供电分公司 | External-breaking-proof device for underground cable |
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| CN201037870Y (en) * | 2007-03-26 | 2008-03-19 | 赵晶 | Metal detector |
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| CN111580173A (en) * | 2020-06-04 | 2020-08-25 | 山东大学 | Metal object detection sensor and detection device |
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| CN113835136A (en) * | 2021-09-09 | 2021-12-24 | 国网河北省电力有限公司辛集市供电分公司 | External-breaking-proof device for underground cable |
| CN113835136B (en) * | 2021-09-09 | 2024-05-07 | 国网河北省电力有限公司辛集市供电分公司 | Underground cable anti-external-damage device |
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