CN105866176B - Scaling method, test method and its system of sorting metals detection - Google Patents
Scaling method, test method and its system of sorting metals detection Download PDFInfo
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Abstract
The invention discloses scaling method, test method and its system of a kind of detection of sorting metals, scaling method includes: the induction region that metal calibration object is passed through the receiving coil of metal detector；Obtain the phase property value T that metal calibration object corresponds to the receiving coil；The calibration object phase property table in alarm database is written into the composition information of phase property value T, metal calibration object.Test method includes: the induction region by measured object by the receiving coil of metal detector；Obtain the phase property value R of measured object；The calibration object phase property table for searching alarm database, judges whether the phase property value R of measured object meets the decision condition in calibration object phase property table；If meeting the decision condition in calibration object phase property table, doubtful signal is issued to alarm module.Sorting metals can be detected using scaling method, test method and its system that sorting metals detect, shorten the review time, improve detection efficiency.
Description
Technical field
The present invention relates to sorting metals fields, in particular to the scaling method and test method of sorting metals detection
And its system.
Background technique
In the enterprises such as raw material smeltery, Metal Processing Factory, to prevent staff in violation of rules and regulations by product in factory or raw material
It carries and goes out, common metal detection door can be all installed under normal conditions.Common metal detection door in actual use, also can be to skin
Buckle, key, the metal objects on clothes generate induction, and staff carries these every-day objects and can by metal detection door
Cause to alarm, what it is because of its indistinguishable detected personnel's carrying is products material or common metal material, so work people
Member must will take off through metal detection door all private metal objects with it, and such mode detection efficiency is low, detection essence
Exactness is low.From the angle of enterprise, it is desirable to be able to detect whether staff carries a certain or several forbid carrying
Metal is outgoing.In addition, in public security protection occasion, it is also desirable to daily carrying object can be excluded, to doubtful iron force
Device, if gun, cutter are alarmed, metal detector always can not detect metal component information.To inspection work belt
Carry out inconvenience.Especially be unable to satisfy the purpose of quick security check in the case of large passenger flow, therefore, it is necessary to a kind of new detection method and
Device solves this problem.
Summary of the invention
The task of the present invention is that can not detect to metal component information to overcome metal detector always, one is provided
Scaling method, test method and its system of kind sorting metals detection.To achieve the above object, this patent uses following technical side
Case:
In a first aspect, providing a kind of scaling method of sorting metals detection, it is characterised in that: the following steps are included:
The induction region that metal calibration object is passed through into the receiving coil of metal detector；
Obtain the phase property value T of metal calibration object；
The calibration object phase property table in alarm database is written into the composition information of phase property value T, metal calibration object.
Preferably, the phase property value T of the metal calibration object is that multiple measurement is averaged to obtain.
Preferably, further comprising the steps of: datum mark is demarcated into sense of the object by the receiving coil of the metal detector
Region is answered, phase property value Z is obtained, sets phase property datum mark 0 for phase property value Z.
Preferably, further comprising the steps of: to calculate T-Z, show that phase of the metal calibration object based on datum mark calibration object is special
Value indicative t；The calibration object phase property table in alarm database is written into the composition information of phase property value t, metal calibration object.
Preferably, the metal calibration object is equipped with M, and m metal demarcates phase property of the object based on datum mark calibration object
Value is expressed as tm, and wherein M, m are greater than 1 natural number, M >=m.
Preferably, the metal calibration object belongs to same class, and the phase by metal calibration object based on datum mark calibration object is special
The minimum value of value indicative is set as phase property value range of the metalloid calibration object based on datum mark calibration object to maximum value.
Preferably, further comprising the steps of: the first datum mark calibration object is passed through to the receiving coil of the metal detector
Induction region, obtain phase property value S, and the calibration object phase property table that is written into alarm database or/and by base
It is demarcated in the difference Z-S write-in alarm database of the phase property value of object and the phase property value of the first datum mark calibration object on schedule
Calibration object phase property table.
Preferably, in calibration object phase property table, write-in: red copper and the phase property difference of stainless steel are 34 °.
Preferably, further comprising the steps of: according in calibration object phase property table, datum mark demarcates the phase property value of object
With the phase property of difference Z-S, metal calibration object based on datum mark calibration object of the phase property value of the first datum mark calibration object
Value is t, calculates phase property value t+Z-S of the metal calibration object based on the first datum mark calibration object and calibration object phase property is written
Table.
Preferably, further include the first receiving coil, datum mark calibration object is passed through to the induction region of the first receiving coil, is obtained
It takes datum mark calibration object to correspond to the phase property value Y of the first receiving coil, calculates the first receiving coil and correspond to the reception
Simultaneously calibration object phase property table is written in the correction value Y-Z of coil.
Preferably, further include the first receiving coil, adjust the phase shifter connecting with the first receiving coil, metal is made to demarcate object
It is identical by the phase property value detected when the first receiving coil that object is demarcated by the receiving coil and metal.
Second aspect provides a kind of test method of sorting metals detection, it is characterised in that: the following steps are included:
Measured object is passed through into the induction region of the receiving coil of metal detector；
Obtain the phase property value R of measured object；
The calibration object phase property table for searching alarm database, judges whether the phase property value R of measured object meets calibration
Decision condition in object phase property table；If meeting the decision condition in calibration object phase property table, issues doubtful signal and arrive
Alarm module.
Preferably, the decision condition is: the phase property value R of measured object and calibration object phase property table acceptance of the bid earnest phase
The difference of position characteristic value T is within the scope of preset.
Preferably, the decision condition is: phase property value R-Z of the measured object based on datum mark calibration object is in tested species
Metal is demarcated within the scope of phase property value of the object based on datum mark calibration object, and Z is the phase property value of datum mark calibration object.
Preferably, phase property value range of the measured object metalloid calibration object based on datum mark calibration object is defeated in advance
Enter to demarcate in object phase property table.
Preferably, the doubtful signal includes the composition information of metal calibration object.
Preferably, further comprising the steps of: after alarm module receives doubtful signal, staff to be reminded to examine manually
It looks into.
The third aspect provides a kind of sorting metals detection system, including metal detector and the transmitting being provided at its inner portion
Coil and receiving coil, it is characterised in that: further include that phase property obtains module and alarm database；Phase property obtains module
Metal measured object is passed through into the phase property value that detects when the induction region of the receiving coil of metal detector for obtaining；Report
There is calibration object phase property table in alert database, calibration object phase property table is for recording phase property value and corresponding metal
Composition information.
It preferably, further include that metal calibration object is obtained for metal calibration object to be passed through to the induction region of the receiving coil
Take its phase property value T.
Preferably, the composition information that record has phase property value T, demarcates object in the calibration object phase property table；Phase
Characteristic value T is that multiple measurement is averaged to obtain.
It preferably, further include datum mark calibration object, for datum mark calibration object to be passed through to the induction zone of the receiving coil
Domain obtains its phase property value Z and is set as phase property datum mark 0.
Preferably, further include benchmark module, for calculating T-Z, show that metal calibration object is based on datum mark and demarcates object
Phase property value t；There are phase property value t, metal calibration object in calibration object phase property table in the alarm database
Composition information.
Preferably, the metal calibration object is equipped with M, and m metal demarcates phase property of the object based on datum mark calibration object
Value is expressed as tm, and wherein M, m are greater than 1 natural number, M >=m.
Preferably, the metal calibration object belongs to same class, demarcates in object phase property table and demarcates object with the metalloid
Based on the phase property value range of datum mark calibration object, which demarcates phase property value model of the object based on datum mark calibration object
Enclose for metal demarcate object based on datum mark demarcate object phase property value minimum value to maximum value.
Preferably, further include the first datum mark calibration object, be written in the calibration object phase property table in alarm database
First datum mark demarcates the phase property value S of object or/and the phase property value of datum mark calibration object and the first datum mark demarcates object
Phase property value difference Z-S.
Preferably, the phase property difference in calibration object phase property table with red copper and stainless steel is 34 °.
It preferably, further include benchmark module, for according in calibration object phase property table, datum mark to demarcate the phase of object
The difference Z-S of position characteristic value and the phase property value of the first datum mark calibration object, metal calibration object are based on datum mark calibration object
Phase property value is t, calculates phase property value t+Z-S of the metal calibration object based on the first datum mark calibration object.
It preferably, further include the first receiving coil；The phase property obtains module and is also used to lead to datum mark calibration object
The induction region of the first receiving coil is crossed, the phase property value Y that datum mark calibration object corresponds to the first receiving coil is obtained；Benchmark
Computing module is also used to calculate the correction value Y-Z that the first receiving coil corresponds to receiving coil.
It preferably, further include the first receiving coil, phase shifter；Phase shifter is for adjusting the first receiving coil output signal
Phase makes metal calibration object pass through the phase that detects when the first receiving coil by the receiving coil and metal calibration object
Characteristic value is identical.
Preferably, further include judgment module, for searching the calibration object phase property table of alarm database, judge measured object
Phase property value R whether meet calibration object phase property table in decision condition, if meet calibration object phase property table in
Decision condition issues doubtful signal；Alarm module, for receiving doubtful signal.
Preferably, the difference of the phase property value R of measured object and calibration object phase property table acceptance of the bid earnest phase property value T
Within the scope of preset.
Preferably, the decision condition is: phase property value R-Z of the measured object based on datum mark calibration object is in tested species
Metal is demarcated within the scope of phase property value of the object based on datum mark calibration object, and Z is the phase property value of datum mark calibration object.
Preferably, phase property value range of the measured object metalloid calibration object based on datum mark calibration object is defeated in advance
Enter to demarcate in object phase property table.
Preferably, the doubtful signal includes the composition information of metal calibration object.
Preferably, the alarm module is also used to after receiving doubtful signal, and staff is reminded to check manually.
Scaling method, test method and the sorting metals detection system detected using sorting metals provided by the invention, solution
Classification detection can be carried out to metal by having determined, and whether have doubtful calibration object object with detection tested personnel, if carrying is forbidden
Metal objects or iron weapon, such as gun, cutter shorten the review time, improve detection efficiency.
Detailed description of the invention
Fig. 1 is the scaling method flow chart of sorting metals detection of the present invention；
Fig. 2 is an embodiment schematic diagram of metal detector of the present invention；
Fig. 3 is the another embodiment schematic diagram of metal detector of the present invention；
Fig. 4 is the first embodiment block diagram of sorting metals detection system of the present invention；
Fig. 5 is the second embodiment block diagram of sorting metals detection system of the present invention；
Fig. 6 is the test method flow chart of sorting metals detection of the present invention；
Fig. 7 is the 3rd embodiment block diagram of sorting metals detection system of the present invention；
Fig. 8 is the fourth embodiment block diagram of sorting metals detection system of the present invention.
Specific embodiment
The invention will be further described with embodiment with reference to the accompanying drawing, but protection scope of the present invention not office
It is limited to the range of embodiment statement.
Metal detector of the present invention includes passing through formula detector 200 or hand-held detector 300.
It is an embodiment schematic diagram of metal detector of the present invention with reference to Fig. 2, Fig. 2.It include main body by formula detector 200
Structure, transmitting coil 201, receiving coil 202, host (not shown).Host sends pumping signal to transmitting coil for controlling
201, receiving coil 202 receives the signal of transmitting coil 201.
It is the another embodiment schematic diagram of metal detector of the present invention with reference to Fig. 3, Fig. 3.Hand-held detector 300 includes master
Body structure, transmitting coil 301, receiving coil 302, host 303.Host 303 sends pumping signal to transmitting coil for controlling
301, receiving coil 302 receives the signal of transmitting coil 301.
According to Maxwell's Theory of Electromagnetic Field, emit pumping signal from transmitting coil 201, by aerial propagation, receives
Coil 202 has induced current and induced electromotive force.Particularly, when have other metal parts transmitting coil 201 or receive
Coil 202 nearby can generate eddy current effect, to influence the induced current and induced electromotive force of the generation of receiving coil 202.
It is the scaling method flow chart that sorting metals of the present invention detect with reference to Fig. 1, Fig. 1.The mark of the sorting metals detection
Determine method, comprising the following steps:
Step S101, the induction region that metal calibration object is passed through into the receiving coil 202 of metal detector.Particularly, golden
During belonging to calibration object calibration, the mode that the automations such as manipulator can be used replaces manual operation, and metal calibration object is led to
The induction region for crossing the receiving coil 202 of metal detector, can play fast and accurate effect.The induction of receiving coil 202
Region refers to that measured object can influence the region of the induced electromotive force of the generation of receiving coil 202, in passing through formula detector 200,
Metal calibration object is passed through into detector sense channel.In hand-held detector 300, metal calibration object is passed through into receiving coil
302 induction regions.
Specifically, when demarcating two receiving coils 202 of corresponding second coil group 203 of metal calibration object, it can be by metal
The space that calibration object is surrounded by dotted line shown in Fig. 2 records metal mark at this time to obtain maximum induced electromotive force variable quantity
Earnest corresponds to the phase property value of two receiving coils 202 in the space.
The metal calibration object is made of heterogeneity, and according to the needs of actual conditions, metal calibration object can be equipped with M
A, M is the natural number greater than 1.
Step S102 obtains the phase property value T that metal calibration object corresponds to the receiving coil 202.Based on same
The transmitting coil 201 pumping signal such as 5360Hz of hardware detection and identical frequency, the material of phase property value T and measured object
Ingredient is related, and therefore, the phase property value T that special metal demarcates object is fixed, but for different receiving coils 202
It says, due to the difference on its analog feature, by different receiving coils 202, the phase property value T of the metal calibration object of measurement is
Different, but for same receiving coil 202, the difference of the phase property value of two different metal calibration objects is fixed.
The calibration in alarm database 205 is written in the composition information of phase property value T, metal calibration object by step S103
Object phase property table.For example, the metal calibration object is equipped with M, then, m metal calibration object phase property value is expressed as Tm,
Record has the composition information of phase property value T, metal calibration object simultaneously in calibration object phase property table.Particularly, consider multiple
The case where receiving coil 202, needs to remember each receiving coil due to the otherness of receiving coil 202 and its analog circuit
Data are recorded, the number of corresponding receiving coil 202 is recorded in phase property table, such as: there are N number of receiving coil, m metal mark
Earnest can recorde by data measured by n-th of receiving coil as Tmn.
It is the first embodiment block diagram of sorting metals detection system of the present invention with reference to Fig. 4, Fig. 4.Specifically, receiving coil
202, which obtain module 204 with phase property, connect, the output wave of phase property acquisition module 204 receiving coil 202 by analysis
Shape extracts waveform phase, obtains phase property value T.Due to the error of test, phase property value T is averaged through repeatedly measurement
It obtains.Phase property obtains module 204 after determining phase property value T, is sent to together with the composition information of metal calibration object
Alarm database 205.
Preferably, by datum mark calibration object by the induction region of the receiving coil 202 of metal detector, acquisition corresponds to
Phase property value Z is set phase property datum mark 0 by the phase property value Z of receiving coil 202.Benchmark module 206 is counted
T-Z is calculated, obtains phase property value t of the metal calibration object based on datum mark calibration object；Phase property value t, metal are demarcated into object
The calibration object phase property table in alarm database 205 is written in composition information.Datum mark calibration object can be metal.
Preferably, the metal calibration object is equipped with M, and m metal demarcates phase property of the object based on datum mark calibration object
Value is expressed as tm, and wherein M, m are greater than 1 natural number, M >=m.The M metal calibration object belongs to same class, and metal is demarcated
The minimum value of phase property value of the object based on datum mark calibration object is set as metalloid calibration object to maximum value and is based on datum mark
Demarcate the phase property value range of object.
Preferably, above-mentioned scaling method is further comprising the steps of: the first datum mark calibration object is passed through the metal detection
The induction region of the receiving coil of device obtains phase property value S, and the calibration object phase property being written into alarm database
Table or/and the difference Z-S write-in that datum mark is demarcated to the phase property value of object and the phase property value of the first datum mark calibration object
Calibration object phase property table in alarm database.Specifically, for example, red copper calibration object and stainless steel calibration object are equipped with, by it
Respectively by the induction region of the receiving coil 202 of metal detector, show that red copper calibration object and stainless steel calibration object phase are special
Value indicative can also obtain its difference, e.g. 34 °, by the calibration object phase property table of this data write-in alarm database.It should manage
Solution, the two metal detector by way of consistent, exciting signal frequency, receiving coil 202 and the phase of transmitting coil 201
It is identical that feature obtains module 204.By above-mentioned calibration mode, can deduce when other receiving coils 202 are detected, as long as
With the phase property value of red copper calibration object for 0, the phase property value of stainless steel calibration object can be judged for -34 °, above scheme increases
The transportable property of experimental data is added.
Preferably, above-mentioned scaling method is further comprising the steps of: according in calibration object phase property table, datum mark demarcates object
Phase property value and the first datum mark calibration object phase property value difference Z-S, metal calibration object be based on datum mark calibration
The phase property value of object is t, calculates phase property value t+Z-S of the metal calibration object based on the first datum mark calibration object and mark is written
Earnest phase property table.Above-mentioned computing function is completed by benchmark module 206, and the result after calculating is stored in calibration object phase
In the mark sheet of position.
If specifically, it is known that it is 34 ° that red copper, which demarcates object and the phase property difference of stainless steel calibration object, and iron class is based on
The phase property value that red copper demarcates object is 10 ° to 80 °, and benchmark module 206 calculates phase of the iron class based on stainless steel calibration object
44 ° to 114 ° of characteristic value of position.
By the above-mentioned means, the phase property difference and measured object of object can be demarcated by known any two datum mark
Based on the phase property value of one of datum mark calibration object, deduce that phase of the measured object based on another datum mark calibration object is special
Value indicative.Further, if, it is known that first datum mark calibration object demarcates the phase property difference of object with second datum mark,
Simultaneously it is also known that the phase property difference of second datum mark calibration object and third datum mark calibration object, can deduce first base
The phase property difference of calibration object and third datum mark calibration object on schedule.It should be understood that said reference point calibration object passed through
The mode of metal detector is consistent, and exciting signal frequency, receiving coil 202 and the phase property of transmitting coil 201 obtain module
204 is identical.It is saved by form, and is applied to each metal detector, debugging and nominal time can be greatlyd save.
Preferably, further include the first receiving coil, datum mark calibration object is passed through to the induction region of the first receiving coil, is obtained
It takes datum mark calibration object to correspond to the phase property value Y of the first receiving coil, calculates the first receiving coil and correspond to the reception
Simultaneously calibration object phase property table is written in the correction value Y-Z of coil.On the one hand, correction value is for correcting phase between two coil links
The difference of position feature detection after the amendment for carrying out Y-Z by the test result to the first receiving coil, first can be received
Coil regards the coil with phase property detection performance identical with receiving coil 202 as.On the other hand, lead to for object will be demarcated
Phase property value obtained when the first receiving coil is crossed, can be modified by correction value, is obtained with calibration object by connecing
The consistent data of phase property value obtained when take-up circle 202 have unified the phase property value of corresponding different receiving coils.
Unified phase property value is conducive to demarcate the unification and migration of object phase property table.It should be appreciated that the receiving coil 202 with
First receiving coil may belong to same metal detector or be belonging respectively to different metal detectors.
It is the second embodiment block diagram of sorting metals detection system of the present invention with further reference to Fig. 5, Fig. 5.
Preferably, further include the first receiving coil 500, adjust the phase shifter 501 in the first receiving coil 500, make metal
Calibration object passes through the phase property that detects when the first receiving coil 500 by the receiving coil 202 and metal calibration object
It is worth identical.Phase shifter 501 connects the first receiving coil 500 and phase property obtains module 204, to the first receiving coil 500
Output signal carries out phase adjustment.By controlling the size of 501 phase shift of phase shifter, while detecting metal calibration object and being connect by first
Phase property value when take-up circle 500 keeps phase property value identical when demarcating object by receiving coil 202 with the metal.
The control of 501 suspension control signal of phase shifter, which can be issued by host, tester can by adjusting phase shifting parameter on host into
One step controls phase shifter 501 and works.In addition, the mode about adjustment 501 phase shift size of phase shifter, can also pass through manual side
Formula adjusts the size of the potentiometer 501 of phase shifter to control the phase shift size of phase shifter 501, until metal calibration object passes through
Receiving coil 202 and metal calibration object are identical by the phase property value detected when the first receiving coil 500.By above-mentioned
Phase shifter correcting mode, the first receiving coil 500 can be regarded as has phase property identical with receiving coil 202 detection property
Can coil, be conducive to the compatibility and uniformity of phase property table data, convenient in different metal detector migration or
Solve the problems, such as that the receiving coil that same metal detector there are multiple analog features different causes phase property value skimble-scamble.
It is the test method flow chart of sorting metals detection of the present invention with further reference to Fig. 6, Fig. 6.
Measured object is passed through the induction region of the receiving coil 202 of metal detector by step S601.
Step S602 obtains the phase property value R of measured object.Measured object passes through the receiving coil 202 of metal detector
The mode of induction region is as metal calibration object is by way of.The mode for calculating phase property value is same.Specifically, connecing
Take-up circle 202 and phase property obtain module 204 and connects, phase property acquisition module 204 receiving coil 202 by analysis it is defeated
Waveform out extracts waveform phase, calculates phase property value R.
Step S603 searches the calibration object phase property table of alarm database 205, judges the phase property value R of measured object
Whether decision condition in calibration object phase property table is met；If meeting the decision condition in calibration object phase property table, send out
Doubtful signal is to alarm module 602 out.
Specifically, have the phase property value T of metal calibration object in calibration object phase property table, the phase of measured object is special
Value indicative R and T is compared one by one.Judge that the difference of the phase property value R and each calibration object phase property value T of measured object exist
Within the scope of preset, if met in default range, then it is assumed that closest to T value metal calibration object material composition with
Measured object is most like.Measured object is classified as doubtful article.Particularly, there is the metal mark closest to T value in the doubtful signal
The composition information of earnest.Preset range can be set according to user in actual use process, preset range
Size determines tolerance degree when test measured object.Through the above scheme, doubtful article can be screened first, further examined
It looks into, improves the efficiency of inspection.
Preferably, the decision condition is: phase property value R-Z of the measured object based on datum mark calibration object is in tested species
Metal is demarcated within the scope of phase property value of the object based on datum mark calibration object, and wherein Z is the phase property value of datum mark calibration object.
If phase property value of the measured object based on red copper is 30 °, it is known that phase property value of the iron class based on red copper calibration object is 10 °
To 80 °, then it is assumed that decision condition is met.Through the above scheme, doubtful article can be screened first, further checked,
Improve the efficiency checked.
Preferably, phase property value range of the measured object metalloid calibration object based on datum mark calibration object is defeated in advance
Enter to demarcate in object phase property table.Specifically, for example, it is pre- that phase property value of the iron class based on red copper calibration object, which is 10 ° to 80 °,
It is first input into calibration object phase property table, it is preferred that save, directly adjusted in different metal detector in the form of a file
With.
Preferably, after alarm module 602 receives doubtful signal, staff is reminded to check manually.The side of prompting
Formula be it is various, by display screen show exception symbol, can show simultaneously closest to T value metal demarcate object composition information, lead to
It crosses loudspeaker and gives a warning sound, pass through light flash.X-ray machine or visual inspection mode can be used in manual type inspection.Institute
State the composition information that doubtful signal includes metal calibration object.
Preferably, metal detector is equipped with more than one receiving coil 202, and the doubtful signal further includes receiving coil
202 location information, wherein receiving coil 202 be the waveform of its induced voltage contain meet calibration object phase property table in
The phase property value information of decision condition, and the variable quantity of its induced voltage is the largest.Location information includes its specific position
It sets or numbers.Its specific location can also be prompted by the way that the light units near receiving coil 202 are arranged in.By above-mentioned
Mode can tell security staff's specific location of doubtful article, it is facilitated further to be checked.Specifically, being tested when one
When object passes through metal detector, part or the induced voltage that can receive of all receiving coils 202 are changed, by mentioning
It takes the waveform of analysis induced voltage that can obtain the corresponding phase characteristic value of receiving coil 202, judges whether it meets phase property
Decision condition in table, for meeting receiving coil 202 corresponding to the phase property value of decision condition, and to its received sense
It answers voltage variety to carry out size comparison, maximum corresponding 202 information of receiving coil of induced voltage variable quantity is included in
In doubtful information and it is sent to alarm module 602.
It is the first embodiment block diagram of sorting metals detection system of the present invention with reference to Fig. 4, Fig. 4.
The invention also includes a kind of sorting metals detection systems, including metal detector and the emission lines being provided at its inner portion
Circle and receiving coil, it is characterised in that: further include that phase property obtains module 204, metal calibration object is passed through into gold for obtaining
Belong to corresponding phase property T when the induction region of the receiving coil 202 of detector；Alarm database 205, wherein alarm database
There is calibration object phase property table in 205, for the composition information of phase property value T, metal calibration object to be written.
Preferably, the sorting metals detection system further includes metal calibration object, for metal calibration object to be passed through institute
The induction region for stating receiving coil obtains its phase property value T.
Below to pass through formula detector 200 as an example.
The induction region that metal calibration object is passed through into the receiving coil 202 of metal detector.Particularly, metal demarcates object mark
In fixed process, the mode that the automations such as manipulator can be used replaces manual operation, and metal is demarcated object by visiting by formula
The induction region for surveying the receiving coil 202 of device, can play fast and accurate effect.The induction region of receiving coil 202 refers to
Measured object can influence the region of the induced electromotive force of the generation of receiving coil 202, in passing through formula detector 200, by metal mark
Earnest passes through detector sense channel.In hand-held detector 300, by metal calibration object close to 302 induction zone of receiving coil
Domain.
Specifically, when demarcating two receiving coils 202 of corresponding second coil group 203 of metal calibration object, it can be by metal
The space that calibration object is surrounded by dotted line shown in Fig. 2 records metal mark at this time to obtain maximum induced electromotive force variable quantity
Earnest corresponds to the phase property value T of two receiving coils 202 in the space.
According to the needs of actual conditions, metal calibration object can be equipped with M, and M is the natural number greater than 1.
Obtain the phase property value T that metal calibration object corresponds to the receiving coil 202.It is set based on identical hardware detection
Standby and identical frequency transmitting coil 201 pumping signal such as 5360Hz, phase property value T is related to the material composition of measured object,
Therefore, the phase property value T of special metal calibration object is fixed, but for different receiving coils 202, due to its mould
Difference in quasi- characteristic, by different receiving coils 202, the phase property value T of the metal calibration object of measurement is different, but right
In same receiving coil 202, it is fixed that two different metals, which demarcate the difference of the phase property value of object,.
The calibration object phase property in alarm database 205 is written into the composition information of phase property value T, metal calibration object
Table.For example, the metal calibration object is equipped with M, then, m metal calibration object phase property value is expressed as Tm, demarcates object phase
Record has the composition information of phase property value T, metal calibration object simultaneously in mark sheet.Particularly, consider multiple receiving coils 202
The case where, due to the otherness of receiving coil 202 and its analog circuit, need to record data to each receiving coil, in phase
The number of corresponding receiving coil 202 is recorded in the mark sheet of position, such as: there is N number of receiving coil, m metal demarcates object and passes through n-th
Data measured by a receiving coil can recorde as Tmn.
With reference to Fig. 4, it is connect specifically, receiving coil 202 obtains module 204 with phase property, phase property obtains module
The waveform of 204 receiving coils 202 by analysis extracts waveform phase, obtains phase property value T.Due to the error of test, phase
Characteristic value T is averaged through repeatedly measurement.Phase property obtains module 204 after determining phase property value T, together with gold
The composition information for belonging to calibration object is sent to alarm database 205.
It is the 3rd embodiment block diagram of sorting metals detection system of the present invention with further reference to Fig. 8, Fig. 8.Preferably, metal
Classification detection system further includes datum mark calibration object, for datum mark calibration object to be passed through to the receiving coil of metal detector
202 induction region obtains the phase property value Z for corresponding to receiving coil 202, sets phase property for phase property value Z
Datum mark 0.Datum mark calibration object can be metal.
Preferably, sorting metals detection system further includes benchmark module 206, for calculating T-Z, show that metal is demarcated
Phase property value t of the object based on datum mark calibration object；There is phase in calibration object phase property table in the alarm database 205
The composition information of position characteristic value t, metal calibration object.
Preferably, the metal calibration object is equipped with M, and m metal demarcates phase property of the object based on datum mark calibration object
Value is expressed as tm, and wherein M, m are greater than 1 natural number, M >=m.The metal calibration object belongs to same class, and metal is demarcated object
The minimum value of phase property value based on datum mark calibration object is set as metalloid calibration object to maximum value and is based on datum mark mark
The phase property value range of earnest.
Preferably, the sorting metals detection system further includes the first datum mark calibration object, the calibration in alarm database
The phase property value S of the first datum mark calibration object or the phase property value of datum mark calibration object are written in object phase property table
With the difference Z-S of the phase property value of the first datum mark calibration object.Specifically, for example, being equipped with red copper calibration object and stainless steel mark
It is passed through the induction region of the receiving coil 202 of metal detector by earnest respectively, show that red copper calibration object and stainless steel are demarcated
Object phase property value can also obtain its difference, e.g. 34 °.The calibration object phase of this data write-in alarm database is special
Levy table.It should be understood that the two metal detector by way of it is consistent, the exciting signal frequency of transmitting coil 201 receives line
Circle 202 is identical as phase property acquisition module 204.By above-mentioned calibration mode, it can deduce and be carried out in other receiving coils 202
When detection, if with red copper calibration object phase property value be 0, can judge stainless steel calibration object phase property value for-
34°.Above scheme increases the transportable property of experimental data.
It preferably, further include benchmark module 206, for according in calibration object phase property table, datum mark to demarcate object
Phase property value and the first datum mark calibration object phase property value difference Z-S, metal calibration object be based on datum mark calibration
The phase property value of object is t, calculates phase property value t+Z-S of the metal calibration object based on the first datum mark calibration object.The meter
It calculates function to be completed by benchmark module 206, the result after calculating is stored in calibration object phase property table.
Specifically, the phase property difference of known red copper calibration object and stainless steel calibration object is 34 °, iron category earnest is based on
The phase property value that red copper demarcates object is 10 ° to 80 °, and benchmark module 206 calculates phase of the iron class based on stainless steel calibration object
44 ° to 114 ° of characteristic value of position.
By the above-mentioned means, the phase property difference and measured object of object can be demarcated by known any two datum mark
Based on the phase property value of one of datum mark calibration object, deduce that phase of the measured object based on another datum mark standard error is special
Value indicative.Further, if, it is known that first datum mark calibration object demarcates the phase property difference of object with second datum mark,
Simultaneously it is also known that the phase property difference of second datum mark calibration object and third datum mark calibration object, can deduce first base
The phase property difference of calibration object and third datum mark calibration object on schedule.It should be understood that the metal detector that the two passes through
Mode is consistent, and the exciting signal frequency of transmitting coil 201, receiving coil 202 are identical as phase property acquisition module 204.Pass through
Form saves, and is applied to each metal detector, can greatly save debugging and nominal time.
Preferably, above-mentioned sorting metals detection system further includes the first receiving coil, and datum mark calibration object is passed through first
The induction region of receiving coil, the phase property obtain module 204 and are also used to datum mark calibration object receiving line by first
The induction region of circle obtains the phase property value Y that datum mark calibration object corresponds to the first receiving coil；Benchmark module 206
It is also used to calculate the correction value Y-Z that the first receiving coil corresponds to receiving coil.On the one hand, correction value is for correcting two coils
The difference that phase property detects between link can be with after the amendment for carrying out Y-Z by test result to the first receiving coil
Regard the first receiving coil as coil with phase property detection performance identical with receiving coil.On the other hand, for inciting somebody to action
It demarcates object and passes through phase property value obtained when the first receiving coil, can be modified by correction value, obtain and demarcate
Object passes through the consistent data of phase property value obtained when receiving coil, that is, has unified the phase property of corresponding different coils
Value.Unified phase property value is conducive to demarcate the unification and migration of object phase property table.It should be appreciated that the receiving coil with
First receiving coil may belong to same metal detector or be belonging respectively to different metal detectors.
It is the second embodiment block diagram of sorting metals detection system of the present invention with further reference to Fig. 5, Fig. 5.
Preferably, above-mentioned sorting metals detection system further includes the first receiving coil 500 and phase shifter 501, phase shifter 501
For adjusting the phase of 500 output signal of the first receiving coil, metal calibration object is made to pass through the receiving coil 202 and metal mark
Earnest is identical by the phase property value detected when the first receiving coil 500.Phase shifter 501 connects the first receiving coil
500 and phase property obtain module 204, phase adjustment is carried out to the output signal of the first receiving coil 500.By controlling phase shift
The size of 501 phase shift of device, while phase property value of the metal calibration object by the first receiving coil 500 when is detected, make phase
Characteristic value is identical when demarcating object by receiving coil 202 with the metal.The control of 501 suspension control signal of phase shifter, which can
It is issued by host, tester can further control the work of phase shifter 501 by adjusting phase shifting parameter on host.In addition, about
The mode for adjusting 501 phase shift size of phase shifter, by manual mode, can also adjust the size of the potentiometer 501 of phase shifter from
And the phase shift size of phase shifter 501 is controlled, until metal calibration object, which demarcates object by receiving coil 202 and metal, passes through first
The phase property value detected when receiving coil 500 is identical.By above-mentioned phase shifter correcting mode, line can be received by first
Circle 500 regards the coil with phase property detection performance identical with receiving coil 202 as, is conducive to phase property table data
Compatibility and uniformity, have multiple analog features convenient for migrating or solving same metal detector in different metal detector
Different receiving coils leads to the skimble-scamble problem of phase property value.
It is the 3rd embodiment block diagram of sorting metals detection system of the present invention with further reference to Fig. 7, Fig. 7.
Sorting metals detection system of the present invention further includes judgment module 701, for searching the mark of alarm database 205
Earnest phase property table, judges whether the phase property value R of measured object meets the decision condition in calibration object phase property table, if
Meet the decision condition in calibration object phase property table, issues doubtful signal；Alarm module 702 is for receiving doubtful signal.
Preferably, the decision condition is: the phase property value R of measured object and calibration object phase property table acceptance of the bid earnest phase
The difference of position characteristic value T is within the scope of preset.Specifically, there being the phase of metal calibration object in calibration object phase property table
Characteristic value T is compared the phase property value R and T of measured object one by one.Judge measured object phase property value R and each
The difference of object phase property value T is demarcated within the scope of preset, if met in default range, then it is assumed that closest to T
The material composition and measured object of the metal calibration object of value are most like.Measured object is classified as doubtful article.Particularly, the doubtful letter
There is the composition information closest to the metal calibration object of T value in number.
Preset range can be determined according to user's setting in actual use process, the size of preset range
Test tolerance degree when measured object.Through the above scheme, doubtful article can be screened first, is further checked, inspection is improved
The efficiency looked into.
Preferably, the decision condition is: phase property value R-Z of the measured object based on datum mark calibration object is in tested species
Metal is demarcated within the scope of phase property value of the object based on datum mark calibration object, and wherein Z is the phase property value of datum mark calibration object.
If for example, phase property value of the measured object based on red copper is 30 °, it is known that phase property value of the iron class based on red copper calibration object
It is 10 ° to 80 °, then it is assumed that decision condition is met.Through the above scheme, doubtful article can be screened first, further
It checks, improves the efficiency of inspection.
Preferably, phase property value range of the measured object metalloid calibration object based on datum mark calibration object is defeated in advance
Enter to demarcate in object phase property table.Specifically, for example, it is pre- that phase property value of the iron class based on red copper calibration object, which is 10 ° to 80 °,
It is first input into calibration object phase property table, it is preferred that save, directly adjusted in different metal detector in the form of a file
With.
Preferably, after alarm module 602 is also used to receive doubtful signal, staff is reminded to check manually.It mentions
Awake mode be it is various, by display screen show exception symbol, can show simultaneously closest to T value metal calibration object ingredient letter
Breath, gives a warning sound by loudspeaker, passes through light flash.X-ray machine or visual inspection side can be used in manual type inspection
Formula.
Preferably, metal detector is equipped with more than one receiving coil 202, and the doubtful signal further includes receiving coil
202 location information, wherein receiving coil 202 be the waveform of its induced voltage contain meet calibration object phase property table in
The phase property value information of decision condition, and the variable quantity of its induced voltage is the largest.Location information includes its specific position
It sets or numbers.Its specific location can also be prompted by the way that the light units near receiving coil 202 are arranged in.By above-mentioned
Mode can tell security staff's specific location of doubtful article, it is facilitated further to be checked.Specifically, being tested when one
When object passes through metal detector, part or the induced voltage that can receive of all receiving coils 202 are changed, by mentioning
It takes the waveform of analysis induced voltage that can obtain the corresponding phase characteristic value of receiving coil 202, judges whether it meets phase property
Decision condition in table, for meeting receiving coil 202 corresponding to the phase property value of decision condition, and to its received sense
It answers voltage variety to carry out size comparison, maximum corresponding 202 information of receiving coil of induced voltage variable quantity is included in
In doubtful information and it is sent to alarm module 602.
Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.Those skilled in the art
Member is it should be appreciated that invention scope involved in the application, however it is not limited to technology made of the specific combination of above-mentioned technical characteristic
Scheme, while should also cover in the case where not departing from the inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent feature
Any combination and the other technical solutions formed.Such as features described above and (but being not limited to) disclosed herein have it is similar
The technical characteristic of function is replaced mutually and the technical solution that is formed.
Claims (33)
1. a kind of scaling method of sorting metals detection, it is characterised in that: the following steps are included:
(A) induction region that metal calibration object is passed through into the receiving coil of metal detector；
(B) the induced electromotive force variable quantity of the receiving coil is obtained, the metal calibration object corresponds to described connect to record at this time
Phase property value T of the phase property value of take-up circle as metal calibration object；Wherein, the phase property value of the metal calibration object
T is fixed and related to the metal calibration material composition of object；
(C) the calibration object phase property table in alarm database is written into the composition information of phase property value T, metal calibration object；
Wherein the method also includes by the induction region of the receiving coil of the metal detector, obtaining datum mark calibration object
Phase property value Z is taken, sets phase property datum mark 0 for phase property value Z,
Further include the first receiving coil, datum mark calibration object is passed through to the induction region of the first receiving coil, obtains datum mark mark
Earnest corresponds to the phase property value Y of the first receiving coil, calculates the amendment that the first receiving coil corresponds to the receiving coil
Simultaneously calibration object phase property table is written in value Y-Z.
2. the scaling method of sorting metals detection according to claim 1, it is characterised in that: the phase of the metal calibration object
Position characteristic value T is that multiple measurement is averaged to obtain.
3. the scaling method of sorting metals detection according to claim 1, it is characterised in that: further comprising the steps of: meter
T-Z is calculated, obtains phase property value t of the metal calibration object based on datum mark calibration object；Phase property value t, metal are demarcated into object
The calibration object phase property table in alarm database is written in composition information.
4. the scaling method of sorting metals detection according to claim 1, it is characterised in that: the metal calibration object is equipped with
M, m metal demarcates object and is expressed as tm based on the phase property value of datum mark calibration object, and wherein M, m are greater than 1 natural number,
M≥m。
5. the scaling method of sorting metals detection according to claim 4, it is characterised in that: the metal calibration object belongs to
The minimum value of same class, the phase property value by metal calibration object based on datum mark calibration object is set as the metalloid to maximum value
Demarcate phase property value range of the object based on datum mark calibration object.
6. the scaling method of sorting metals detection according to claim 1, it is characterised in that: further comprising the steps of: will
First datum mark demarcates induction region of the object by the receiving coil of the metal detector, obtains phase property value S, and by its
The phase property value and the first datum mark for demarcating object phase property table or/and datum mark is demarcated to object in alarm database is written
Demarcate the calibration object phase property table in the difference Z-S write-in alarm database of the phase property value of object.
7. the scaling method of sorting metals detection according to claim 6, it is characterised in that: in calibration object phase property table
In, write-in: red copper and the phase property difference of stainless steel are 34 °.
8. the scaling method of sorting metals detection according to claim 6, it is characterised in that: further comprising the steps of: root
According in calibration object phase property table, datum mark demarcates the phase property value and the phase property value of the first datum mark calibration object of object
The phase property value of difference Z-S, metal calibration object based on datum mark calibration object is t, calculates metal calibration object and is based on the first benchmark
Simultaneously calibration object phase property table is written in the phase property value t+Z-S of point calibration object.
9. according to claim 1 in -8 the sorting metals detection of any claim scaling method, it is characterised in that: further include
The phase shifter that connect with the first receiving coil is adjusted, metal calibration object is made to pass through the by the receiving coil and metal calibration object
The phase property value detected when one receiving coil is identical.
10. a kind of test method of sorting metals detection, it is characterised in that: the following steps are included:
(D) measured object is passed through into the induction region of the receiving coil of metal detector；
(E) the induced electromotive force variable quantity of the receiving coil is obtained, the measured object corresponds to the reception line to record at this time
Phase property value R of the phase property value of circle as measured object；Wherein, the phase property value R of the measured object be it is fixed and
It is related to the material composition of the measured object；
(F) the calibration object phase property table for searching alarm database, judges whether the phase property value R of measured object meets calibration object
Decision condition in phase property table；If meeting the decision condition in calibration object phase property table, doubtful signal is issued to report
Alert module,
Wherein the calibration object phase property table is built using the scaling method of sorting metals according to claim 1 detection
It is vertical.
11. the test method of sorting metals detection according to claim 10, it is characterised in that: the decision condition is:
The difference of the phase property value R of measured object and calibration object phase property table acceptance of the bid earnest phase property value T preset range it
It is interior.
12. the test method of sorting metals detection according to claim 10, it is characterised in that: the decision condition is:
Phase property value R-Z of the measured object based on datum mark calibration object is in phase of the measured object metalloid calibration object based on datum mark calibration object
In the range of characteristic values of position, Z is the phase property value of datum mark calibration object.
13. the test method of sorting metals detection according to claim 12, it is characterised in that: the measured object metalloid
Phase property value range of the calibration object based on datum mark calibration object is pre-entered in calibration object phase property table.
14. the test method that the sorting metals of any claim detect in 0-12 according to claim 1, it is characterised in that: institute
State the composition information that doubtful signal includes metal calibration object.
15. the test method of sorting metals detection according to claim 14, it is characterised in that: further comprising the steps of:
After alarm module receives doubtful signal, staff is reminded to check manually.
16. a kind of sorting metals detection system, including metal detector and the transmitting coil and receiving coil that are provided at its inner portion,
It is characterized by also including phase properties to obtain module and alarm database；Phase property obtains module for metal to be tested
Object is by obtaining the induced electromotive force variable quantity of the receiving coil, record when the induction region of the receiving coil of metal detector
The metal measured object corresponds to phase property value of the phase property value of the receiving coil as metal measured object at this time；Its
In, the phase property value of the metal measured object is fixed and related to the material composition of the metal measured object；Alarm number
According to there being calibration object phase property table in library, calibration object phase property table is for recording phase property value and corresponding metal component
Information, wherein the calibration object phase property table is built using the scaling method of sorting metals according to claim 1 detection
It is vertical.
17. sorting metals detection system according to claim 16, it is characterised in that: further include metal calibration object, be used for
The induction region that metal calibration object is passed through to the receiving coil, obtains the induced electromotive force variable quantity of the receiving coil, remembers
The metal calibration object corresponds to phase property value of the phase property value of the receiving coil as metal calibration object at this time for record
T；Wherein, the phase property value T of the metal calibration object is fixed and related to the metal calibration material composition of object.
18. sorting metals detection system according to claim 17, it is characterised in that: in the calibration object phase property table
The composition information that record has phase property value T, demarcates object；Phase property value T is that multiple measurement is averaged to obtain.
19. sorting metals detection system according to claim 18, it is characterised in that: further include datum mark calibration object, use
In the induction region that datum mark calibration object is passed through to the receiving coil, obtains its phase property value Z and be set as phase property base
On schedule 0.
20. sorting metals detection system according to claim 19, it is characterised in that: further include benchmark module, use
In calculating T-Z, phase property value t of the metal calibration object based on datum mark calibration object is obtained；Calibration in the alarm database
There are the composition information of phase property value t, metal calibration object in object phase property table.
21. sorting metals detection system according to claim 20, it is characterised in that: the metal calibration object is equipped with M,
M metal demarcates object and is expressed as tm based on the phase property value of datum mark calibration object, and wherein M, m are greater than 1 natural number, and M >=
m。
22. sorting metals detection system according to claim 21, it is characterised in that: the metal calibration object belongs to same
Class demarcates the phase property value range in object phase property table with metalloid calibration object based on datum mark calibration object, such
It is the phase that metal demarcates that object demarcates object based on datum mark that metal, which demarcates phase property value range of the object based on datum mark calibration object,
The minimum value of characteristic value is to maximum value.
23. sorting metals detection system according to claim 20, it is characterised in that: further include the calibration of the first datum mark
Object is written with the phase property value S or/and base of the first datum mark calibration object in the calibration object phase property table in alarm database
The difference Z-S of the phase property value of object and the phase property value of the first datum mark calibration object is demarcated on schedule.
24. sorting metals detection system according to claim 23, it is characterised in that: write in calibration object phase property table
Red copper and the phase property difference of stainless steel are 34 °.
25. sorting metals detection system according to claim 23, it is characterised in that: further include benchmark module, use
According in calibration object phase property table, datum mark demarcates the phase property value of object and the phase property of the first datum mark calibration object
The phase property value of difference Z-S, metal calibration object based on datum mark calibration object of value is t, calculates metal calibration object and is based on first
The phase property value t+Z-S of datum mark calibration object.
26. according to claim 1 in 9-25 any claim sorting metals detection system, it is characterised in that: further include
One receiving coil；The phase property obtains module and is also used to datum mark demarcating the induction zone that object passes through the first receiving coil
Domain obtains the phase property value Y that datum mark calibration object corresponds to the first receiving coil；Benchmark module is also used to calculate first
Receiving coil corresponds to the correction value Y-Z of receiving coil.
27. according to claim 1 in 9-25 any claim sorting metals detection system, it is characterised in that: further include
One receiving coil, phase shifter；Phase shifter is used to adjust the phase of the first receiving coil output signal, and metal calibration object is made to pass through institute
It states receiving coil and metal calibration object is identical by the phase property value detected when the first receiving coil.
28. sorting metals detection system according to claim 16, it is characterised in that: further include judgment module, for looking into
The calibration object phase property table for looking for alarm database, judges whether the phase property value R of measured object meets calibration object phase property
Decision condition in table issues doubtful signal if meeting the decision condition in calibration object phase property table；Alarm module is used for
Receive doubtful signal.
29. sorting metals detection system according to claim 28, it is characterised in that: the decision condition is: measured object
Phase property value R and calibration object phase property table acceptance of the bid earnest phase property value T difference within the scope of preset.
30. sorting metals detection system according to claim 28, it is characterised in that: the decision condition is: measured object
Phase property value R-Z based on datum mark calibration object is in phase property of the measured object metalloid calibration object based on datum mark calibration object
It is worth in range, Z is the phase property value of datum mark calibration object.
31. sorting metals detection system according to claim 30, it is characterised in that: the measured object metalloid demarcates object
Phase property value range based on datum mark calibration object is pre-entered in calibration object phase property table.
32. according to the sorting metals detection system of any claim in claim 28-30, it is characterised in that: described doubtful
Signal includes the composition information of metal calibration object.
33. sorting metals detection system according to claim 32, it is characterised in that: the alarm module is also used to receiving
To after doubtful signal, staff is reminded to check manually.
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| CN201610184184.0A CN105866176B (en) | 2016-03-25 | 2016-03-25 | Scaling method, test method and its system of sorting metals detection |
| PCT/CN2017/077105 WO2017162107A1 (en) | 2016-03-25 | 2017-03-17 | Discrimination method and test method for detection of metal classification and system thereof |
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| CN105866176B (en) * | 2016-03-25 | 2019-02-05 | 东莞市华盾电子科技有限公司 | Scaling method, test method and its system of sorting metals detection |
| CN108398724A (en) * | 2018-02-09 | 2018-08-14 | 李法利 | waveform detection circuit |
| CN108345038A (en) * | 2018-02-09 | 2018-07-31 | 李法利 | Waveform processing method based on metal detection |
| CN108415085A (en) * | 2018-02-09 | 2018-08-17 | 李法利 | Detection method for detecting metal product |
| CN108318075A (en) * | 2018-02-09 | 2018-07-24 | 李法利 | The control circuit of safety check apparatus |
| CN108415084A (en) * | 2018-02-09 | 2018-08-17 | 李法利 | Alarm method |
| CN109557167A (en) * | 2018-10-26 | 2019-04-02 | 东莞市华盾电子科技有限公司 | A kind of scaling method and system of sorting metals detection |
| CN109799536A (en) * | 2019-04-01 | 2019-05-24 | 中控智慧科技股份有限公司 | A kind of intellectual analysis safety check apparatus based on difference judgement |
| CN111190232B (en) * | 2020-03-05 | 2023-10-31 | 大同市快安科技有限公司 | Metal forbidden article detection device and multi-parameter comprehensive judgment method thereof |
| CN113537343A (en) * | 2021-07-14 | 2021-10-22 | 厦门熵基科技有限公司 | Metal classification method, device, equipment and storage medium |
| CN113792675A (en) * | 2021-09-17 | 2021-12-14 | 上海兰宝传感科技股份有限公司 | Metal material analysis method and device |
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| CN1166945C (en) * | 2001-04-30 | 2004-09-15 | 宝山钢铁股份有限公司 | Double detection coil metal probing method and device |
| US20040178789A1 (en) * | 2003-03-14 | 2004-09-16 | Candelore Dominick A. | Hands-free metal detector |
| CN2694270Y (en) * | 2004-03-31 | 2005-04-20 | 中国电子科技集团公司第五十研究所 | Hand-held resoluble metal detector circuit |
| CN101556253B (en) * | 2008-04-09 | 2011-09-21 | 中国电子科技集团公司第五十研究所 | Device and method for detecting hidden metal articles |
| CN105866176B (en) * | 2016-03-25 | 2019-02-05 | 东莞市华盾电子科技有限公司 | Scaling method, test method and its system of sorting metals detection |
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