CN107884835A - A kind of highly sensitive SMART METALS detector - Google Patents
A kind of highly sensitive SMART METALS detector Download PDFInfo
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- CN107884835A CN107884835A CN201711388289.9A CN201711388289A CN107884835A CN 107884835 A CN107884835 A CN 107884835A CN 201711388289 A CN201711388289 A CN 201711388289A CN 107884835 A CN107884835 A CN 107884835A
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- 238000010801 machine learning Methods 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 9
- 238000011896 sensitive detection Methods 0.000 claims description 9
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
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- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The present invention proposes a kind of highly sensitive SMART METALS detector, including intelligent display terminal, casing, sense channel, main control module, launch driving circuit, transmitting coil, receiving coil and receiving circuit；Main control module is connected with launch driving circuit, receiving circuit；The launch driving circuit is connected with transmitting coil；Receiving coil is connected with receiving circuit；Casing is the large through-hole tubular member for possessing sandwich construction tube wall；Large-scale through hole in tubular member is sense channel；The sandwich construction of casing includes outer casing, cushion, screen layer and coil layer successively from the outside to the core；The transmitting coil, receiving coil are at coil layer；Screen layer includes electric field shielding film and/or magnetic field shielding film；The present invention has multilayer screen structure, and can shake and keep high sensitivity under interference environment, outer casing can use metal or plastic shaping, have cost flexibility, and there is graphical interfaces and the communication capacity based on internet, be easy to manage and introduce mechanism of Machine Learning.
Description
Technical field
The present invention relates to material tests field, especially a kind of highly sensitive SMART METALS detector.
Background technology
Metal detection probe is the common equipment that factory is detected to finished product, is widely used in food, health, weaving etc.
In commodity detection, it is desirable to which sensitivity is very high, can detect tiny metal, so as to ensure user security.But existing probe knot
Structure generally existing problems with；1st, anti-electromagnetic interference capability is poor, is shielded usually using one layer of 304 stainless steel casing, because of 304
Non- high magnetic conductive material, it is mainly used in shielding electric jamming, it is weak to magnetic field particularly low frequency magnetic field screening ability；.2, sensitivity
Low, because anti-electromagnetic interference capability is limited, sensitivity is relatively low（Sensitivity dare not be heightened）；3rd, resistance to mechanical vibrational energy
Power is poor, because metal shell weight, volume are big, when the mechanical oscillation of streamline reach shell, and meeting between shell and receiving coil
There is slight relative motion, be also easy to produce wrong report.4th, technique is unreasonable, and transmitting coil and receiving coil are generally placed in by existing process
Width is more than in the groove of the plastic plate of line footpath, upper epoxy encapsulation, due to metal, epoxy resin, plastic expansion coefficient
Difference, through Transport Vibration, expand with heat and contract with cold, after the time has been grown, between wire coil and epoxy resin, epoxy resin and bakelite plate
Between can slightly depart from, thus coil and plastic protective plate can produce space and deformation, make double reception coil dispatch from the factory balance by
Destroy, and coil generation weak vibrations easily affected by vibration, easily wrong report.5th, without the networked capabilities based on internet, gold
The data of category detector are difficult to real-time statistics, and distribution various regions, the product data in each workshop are difficult to Real-Time Sharing, statistics and learned mutually
Practise.
The content of the invention
The present invention proposes a kind of highly sensitive SMART METALS detector, censorship thing can be carried out when conveyer belt conveys fast
Fast metal detection, and high sensitivity can be kept under vibration environment, and there is graphical interfaces and the communication based on internet
Ability, it is easy to manage and introduce mechanism of Machine Learning.
The present invention uses following technical scheme.
A kind of highly sensitive SMART METALS detector, the metal detector include intelligent display terminal, casing, detection
Passage, main control module, launch driving circuit, transmitting coil, receiving coil and receiving circuit；The main control module drives with transmitting
Circuit, receiving circuit are connected；The launch driving circuit is connected with transmitting coil；The receiving coil is connected with receiving circuit；
The casing is the large through-hole tubular member for possessing sandwich construction tube wall；Large-scale through hole in tubular member is sense channel；The machine
The sandwich construction of shell includes outer casing, cushion, screen layer and coil layer successively from the outside to the core；The transmitting coil, receive line
Circle is at coil layer；The screen layer includes electric field shielding film and/or magnetic field shielding film.
The intelligent display terminal is connected with main control module through serial ports；The intelligent display terminal has graphical interfaces, touched
Screen and internet communication component are touched, graphical interfaces and touch-screen are used to carry out parameter setting and display testing result, the intelligence
Display terminal can communicate with Internet Server, shared data and progress machine learning.
The large through-hole tubular member is square tubular member；When metal detection pops one's head in work, part to be checked is in the detection
Irreversibly delivered in passage.
The coil layer includes transmitting coil, receiving coil and coil backplate；The coil layer is away from screen layer, the hair
Ray circle, receiving coil are around sense channel.
The receiving coil includes the receiving coil of specification identical first and the second receiving coil, and described first, second connects
Take-up circle is parallel to each other and is located at perpendicular to sense channel, the transmitting coil in the first receiving coil and the second receiving coil
Between；When being provided with electric field shielding film and magnetic field shielding film simultaneously in screen layer, with exhausted between electric field shielding film and magnetic field shielding film
Edge layer is isolated.
The shielding layer main body is plastic layer, and electric field shielding film and magnetic field shielding film, institute are provided with inside and outside plastic layer
State electric field shielding film to be molded with the low material spraying of resistivity, the magnetic field shielding film is with high magnetic conductive material spray mo(u)lding.
The electric field shielding film is molded with the low material of plating mode or resistivity such as copper-clad silver conductive paint spray, the magnetic
Field shield film is molded with high magnetic conductive material such as nickel alloy conductive paint spray.
The outer casing is with stainless steel or plastic shaping；There is prominent plastic column on the outside of the screen layer, have screw thread in post,
Insulated between screen layer and outer casing with cushion or air-gap and plastic column, and plastic spiral is passed through with the screw of dense distribution
Silk post connection locking.
The coil backplate is provided with width with plastic shaping, at coil backplate and is equal to or slightly less than coil diameter, height slightly
More than the groove of coil diameter, coil is suppressed in embedded groove using the elasticity of plastics, then with epoxy resin sealing.
The cushion is molded with elastomeric material such as hard foam.
DSP or MCU main control chips built in the main control module；Main control chip exports square wave or warp to launch driving circuit
DDS chips export sine wave signal to the transmitting launch driving circuit；Push-pull circuit built in the transmitting launch driving circuit
To amplify the waveform signal that main control module transmits；The transmitting launch driving circuit is connected with transmitting coil, the receiving coil
Receive the wireless signal of transmitting coil and deliver to main control module after receiving circuit processing；When part to be checked includes metallic foreign body
When, during metallic foreign body is by sense channel, signal phase and width that the first receiving coil, the second receiving coil receive
Value changes over time, and this change obtains signal waveform after phase sensitive detection, low pass filtered involve amplification, when the peak value of signal waveform is big
When default threshold value, main control module sends alarm signal.
The operating voltage of the launch driving circuit is in more than 15V, and the operating current of power tube is in more than 6A, sense channel
It is interior to be provided with conveyer belt to transmit part to be checked；The main control module, launch driving circuit and receiving circuit are divided into different electromagnetism
In cask flask.
The operation principle of the present invention is as follows：DSP or 32 MCU main control chip built in the main control module of the present invention；After upper electricity,
Main control chip exports square wave or the sine wave signal after waveform changing circuit is changed to launch driving circuit；Transmitting transmitting driving
Push-pull amplifier circuit built in circuit, there is resonant selecting frequency network, the higher hamonic wave of square wave can be filtered, form sine wave；Transmitting is driven
Dynamic circuit is connected the sine wave signal exported after amplifying with transmitting coil.
Receiving coil receives the signal of transmitting coil, and received circuit delivers to main control module；Include the to be checked of metallic foreign body
During part is by sense channel, because of electromagnetic induction, it will produce vortex, this vortex produces superposition electromagnetic field, makes first to connect
The signal phase and amplitude that take-up circle, the second receiving coil receive produce the superposed signal changed over time, this superposed signal warp
After phase sensitive detection, low pass filtered involve enhanced processing, the AD ports measurement of main control chip is sent into, if its peak value is more than default threshold
Value, main control module send alarm signal.
The core of phase sensitive detection is multiplier chip, due to being folded caused by the metallic foreign body of the different materials such as iron, stainless steel
Plus signal phase is different, during above-mentioned phase sensitive detection, it is necessary to produced by main control module differ 90 degree two-way and transmission signal it is same
The reference signal of frequency, multiplier chip is sent into, is multiplied respectively with reception signal, obtain two-way rectified signal, filtered, amplification
Afterwards, its signal powerhouse is taken to carry out analysis judgement.
Some products have certain conductive capability in itself（Such as some food containing moisture content）, when it passes through sense channel
When, vortex can be also produced, superposed signal is produced in wiring circle, this is referred to as product effect, due to being folded caused by different materials
Plus signal phase is different, and DSP can be handled in phase sensitive detection by phase shift, is avoiding product effect to a certain degree, increase is strong
Sensitivity to certain metalloid.
In the present invention, outer casing can be metal or plastics, and when outer casing is plastics, conductive paint is sprayed on the inside of it,
Electric field shielding film is formed, such outer casing still has screening ability, and can reduce cost and be adapted to produce in enormous quantities.
Intelligent display terminal is WIN10 industry flat board or the embedded system based on 32 MCU, passes through string with main control module
Mouthful it is connected, it has graphical interfaces and network service concerted effort, can be communicated with Internet Server, can be on real-time statistics streamline
Metallic foreign body alarm rate, product learning data is shared, carry out remote upgrade and setting.
Software based on Win10 industry flat boards is developed using RAD developing instruments such as Delphi, C#, utilizes its graphical interfaces
Control, GetIpUpDown, DataBase Control quickly develop shaping.Embedded system based on 32 MCU is carried using STMicw Electronics
The STM32 development boards exploitation of confession, the function library provided using producer realize network service, the drive provided using liquid crystal panel producer
Dynamic function library realizes graphical interfaces.
Having the beneficial effect that for circuit design of the present invention is described：The present invention employs differential signal in receiving side signal face and set
Meter, possesses stronger anti-common mode disturbances ability, while phase sensitive detection has very strong rejection ability to the signal of non-same frequency, in addition,
By main control module DSP computing, probe can be strengthened ambient signal is identified, lift the antijamming capability of probe, visited so as to allow
Head is still not easy to report by mistake after sensitivity is heightened.
Shielding construction of the present invention has three layers, includes the electromagnetic field of shell（Steel or conductive paint）Shielding, the electric field of screen layer
（Copper contracted payment conductive paints）, magnetic field（High magnetic conductive material conductive paint）；So as to have very strong anti-electromagnetic interference capability, with existing list
Layer shielding product compare, can heighten the i.e. receiving circuit of product sensitivity amplification electricity multiple and reduce alarm threshold value and less
Easily influenceed by environmental disturbances；Due to the screened film of screen layer be extremely gently not easy it is affected by vibration, can preferably shield metal shell because
Interference caused by vibrating deformation.
In the present invention, the screen layer is close to shell, away from coil layer, so as to avoid screen layer from largely absorbing transmitting coil
The electromagnetic wave energy sent.Compared with conventional only layer of metal shell makees the design that shields, the design although more two layers of screen
Cover, but three screen layers are in close proximity and away from coil layer, can suitably increase coil layer and the relative distance of screen layer, make screen
Layer is covered because influence of the electromagnetic wave absorption to sensitivity is sufficiently small.
In the present invention, the coil backplate is with plastic shaping.Width is carved with plastics equal to or slightly less than coil diameter, height
Degree is slightly larger than the groove of coil diameter, and coil is suppressed in embedded groove using the elasticity of plastics, then with epoxy resin sealing.By
There is certain elasticity in plastics, recess width is equal to or slightly less than line footpath, even if Transport Vibration or difference variation of expanding with heat and contract with cold, still
Coil can be locked, is allowed to be not easy to rock and deformation, generation is reported by mistake.
In the present invention, dsp chip built in the main control module；Dsp chip exports sine wave signal to launch driving circuit；
Push-pull circuit built in the launch driving circuit is to amplify the sine wave signal that main control module transmits；The launch driving circuit with
Transmitting coil is connected with the sine wave signal after output amplification；The operating voltage of the launch driving circuit is in more than 15V, transmitting
The operating current of drive circuit is in more than 6A；The design using powerful signal transmitting design, and use push-pull circuit with
Lifting circuit efficiency makes emissivities further strengthen, and so as to effectively suppress ambient noise with high-power signal, makes probe
The quick detection of big quantity part to be checked can be tackled.
This product sets cushion on the outside of screen layer, reduces influence of the exterior vibration to screen layer so that the gold of screen layer
Category film is in geo-stationary with coil, will not produce disturbance to electromagnetic field, so as to be carried by the electromagnetic environment in stable probe
The antijamming capability of probe is risen.
Brief description of the drawings
The present invention is described in more detail with reference to the accompanying drawings and detailed description：
Accompanying drawing 1 is the schematic diagram of coil distribution of the present invention；
Accompanying drawing 2 is the schematic diagram of the present invention；
Accompanying drawing 3 is the circuit theory schematic diagram of the present invention；
Accompanying drawing 4 is the schematic diagram of screen layer；
In figure：1- transmitting coils；2- receiving coils；3- coil backplates；4- conveyer belts；5- parts to be checked；6- outer casings；7- is buffered
Layer；8- screen layers；9- coil layers；10- main control modules；11- sense channels；12- is electromagnetically shielded container；13- launch driving circuits；
14- receiving circuits；15- electric field shielding films；16- insulating barriers；17- magnetic field shielding films；160- intelligent display terminals.
Embodiment
As Figure 1-4, a kind of highly sensitive SMART METALS detector, it is whole that the metal detector includes intelligent display
End, casing, sense channel 11, main control module 10, launch driving circuit 13, transmitting coil 1, receiving coil 2 and receiving circuit 14；
The main control module 10 is connected with launch driving circuit 13, receiving circuit 14；The launch driving circuit 13 and the phase of transmitting coil 1
Even；The receiving coil 2 is connected with receiving circuit 14；The casing is the large through-hole tubular member for possessing sandwich construction tube wall；Pipe
Large-scale through hole in shape part is sense channel 11；The sandwich construction of the casing includes outer casing 6, cushion successively from the outside to the core
7th, screen layer 8 and coil layer 9；The transmitting coil 1, receiving coil 2 are at coil layer 9；The screen layer 8 includes electric field screen
Cover film 15 and/or magnetic field shielding film 17.
Outer casing and shielding interlayer are provided with cushion 7.
The intelligent display terminal is connected with main control module through serial ports；The intelligent display terminal has graphical interfaces, touched
Screen and internet communication component are touched, graphical interfaces and touch-screen are used to carry out parameter setting and display testing result, the intelligence
Display terminal can communicate with Internet Server, shared data and progress machine learning.
The large through-hole tubular member is square tubular member；When metal detection pops one's head in work, part to be checked is in the detection
Irreversibly delivered in passage.
The coil layer includes transmitting coil 1, receiving coil 2 and coil backplate 3；The coil layer is away from screen layer, institute
Transmitting coil, receiving coil are stated around sense channel 11.
The receiving coil includes the receiving coil of specification identical first and the second receiving coil, and described first, second connects
Take-up circle is parallel to each other and is located at perpendicular to sense channel, the transmitting coil in the first receiving coil and the second receiving coil
Between.
When being provided with electric field shielding film 15 and magnetic field shielding film 17 simultaneously in screen layer 8, electric field shielding film and magnetic field shielding
Isolated between film with insulating barrier 16.
The shielding layer main body is plastic layer, and electric field shielding film and magnetic field shielding film, institute are provided with inside and outside plastic layer
State electric field shielding film to be molded with the low material spraying of resistivity, the magnetic field shielding film is with high magnetic conductive material spray mo(u)lding.
The electric field shielding film with the low material of resistivity for example copper-clad silver conductive paint spray be molded, the magnetic field shielding film with
High magnetic conductive material such as nickel alloy conductive paint spray is molded.
The outer casing 6 is with stainless steel or plastic shaping；There is prominent plastic column on the outside of the screen layer, have spiral shell in post
Line, insulated between screen layer and outer casing with cushion or air-gap and plastic column, and modeling is passed through with the screw of dense distribution
Expect screw column connection locking.
The coil backplate is provided with width with plastic shaping, at coil backplate and is equal to or slightly less than coil diameter, height slightly
More than the groove of coil diameter, coil is suppressed in embedded groove using the elasticity of plastics, then with epoxy resin sealing.
The cushion 7 is molded with hard foam.
DSP or MCU main control chips built in the main control module 10；Main control chip exports square wave or warp to launch driving circuit
DDS chips export sine wave signal to the transmitting launch driving circuit；Push-pull circuit built in the transmitting launch driving circuit
To amplify the waveform signal that main control module transmits；The transmitting launch driving circuit is connected with transmitting coil, the receiving coil
Receive the wireless signal of transmitting coil and deliver to main control module after receiving circuit processing；When part to be checked includes metallic foreign body
When, during metallic foreign body is by sense channel, signal phase and width that the first receiving coil, the second receiving coil receive
Value changes over time, and this change obtains signal waveform after phase sensitive detection, low pass filtered involve amplification, when the peak value of signal waveform is big
When default threshold value, main control module sends alarm signal.
The operating voltage of the launch driving circuit is in more than 15V, and the operating current of launch driving circuit is in more than 6A, inspection
Survey in passage and be provided with conveyer belt 4 to transmit part 5 to be checked；The main control module 10, launch driving circuit 13 and receiving circuit 14 are divided
In different electromagnetic shielding containers 12.
Embodiment 1：
By field working conditions, the differential signal alarm threshold of main control module is set so that in normal conditions, probe will not be to normal
Electromagnetic disturbance alarm.
Pop one's head in work when, transmitting coil transmitting signal by both sides receiving coil receive, when in sense channel without to be checked
During thing, because two receiving coil specifications are identical, therefore received signal is consistent, and probe is not alarmed.
When probe carries out metal detection to thing to be checked, thing to be checked is sent into sense channel by conveyer belt；If in thing to be checked
Metal object be present, then transmitting coil transmission signal can produce reflection at metal object, the electromagnetic field in sense channel be produced dry
Disturb, so that the signal that the first receiving coil, the second receiving coil receive produces the difference in different time points, connect when first
When the difference of take-up circle and the second receiving coil reception signal is more than threshold value, main control module sends alarm signal.
Embodiment 2：
Parameter preset and error balance work of this product when implementing are as follows.
First test site streamline operating mode and product performance to be checked.In the touch-screen setting and adjustment of intelligent display terminal
The parameters such as the alarm threshold of main control module, gain amplifier value, detected phase so that in normal conditions, probe will not be to common mode
Electromagnetic disturbance alarm.
During the flow work, the signal of transmitting coil transmitting is received by the receiving coil of both sides, when nothing is treated in sense channel
When examining thing, because two receiving coil specifications are identical, therefore received signal is consistent, in theory the voltage differential of two receiving coils
Value is zero, and probe is not alarmed.Actually due to technique and material error, difference value is simultaneously not zero, but has certain numerical value, this
Numerical value is systematic error, is read before for example being started shooting when streamline dallies in 10 seconds, and bales catch removes during the flow work.
Embodiment 3：
This product as described in Example 2, the PWM side that main control module is sent using dsPIC chips as core, sine wave by dsPIC
Ripple shaping forms, or is synthesized by dsPIC by serial port setting DDS chips；The push-pull circuit that sine wave forms through BU407 power tubes
Driving transmitting coil sends wireless signal；For receiving circuit using AD817 as core, the signal of two receiving coils is connected to AD817 difference
Divide input, amplified feeding MC1496 multipliers carry out phase sensitive detection, and main control chip dsPIC is produced with transmission signal with frequently
Two-way phase difference be 90 degree orthogonal signalling injection multiplier, be multiplied respectively with reception signal, it is low-pass filtered to isolate two
Superposed signal ripple number caused by the metallic foreign body of road, is then fed into multilevel signal amplifying circuit, is finally sent into the AD of main control chip
Port measures.Main control chip is by controlling multiple digital regulation resistance x9c104 to control operational amplifier op282 amplification
Ratio is gain, and making final signal, gain parameter is pre-set by intelligent terminal in OK range, then by being sent into
DsPIC is AD converted, and is alarmed if AD values exceed threshold value.
If the operating voltage for making transmitting launch driving circuit is positive and negative 15V, the peak operation current of launch driving circuit is
In 200KHz or so, actual measurement can detect diameter 0.8mm iron foreign body or diameter 1.5mm for 6A, sine wave or square wave frequency
Stainless steel foreign matter, frequency is higher, power is bigger, and the metallic foreign body diameter that can be measured is smaller；Due to using high-power high-frequency rate
Signal transmitting design, and use push-pull circuit emissivities is further strengthened to lift circuit efficiency, so as to effective
Ground is to suppress ambient noise.
Embodiment 4
This product as described in Example 3；The industrial flat board or embedded based on 32 MCU that intelligent display terminal is WIN10
System, the information such as the product effect alarmed and learn to obtain are issued server, serviced by it by mixed-media network modules mixed-media connection server
Device can be arranged in factory local area network or the virtual server based on Internet or hosting；In intelligent terminal
The order for the software acceptable server put, carry out remote parameter setting and upgrading.Administrative staff can by mobile terminal or
Desktop PC is connected with server, remote inquiry data and management.
Embodiment 5：
This product as described in Example 4, crucial warning message include device id, time of fire alarming, factory ID, product IDs etc.,
The key message of product effect includes product IDs, phase-shift phase etc., when the metal detector for being distributed in various regions run up to it is a certain amount of
Product effect data, and after being summarized in server, metal detector can be carried out statistical learning, i.e. metal detector can be straight
Connect from the parameter database of product effect and obtain information.The statistics of warning message is available for factory's decision references.
Claims (10)
- A kind of 1. highly sensitive SMART METALS detector, it is characterised in that：The metal detector include intelligent display terminal, Casing, sense channel, main control module, launch driving circuit, transmitting coil, receiving coil and receiving circuit；The main control module It is connected with launch driving circuit, receiving circuit；The launch driving circuit is connected with transmitting coil；The receiving coil is with receiving Circuit is connected；The casing is the large through-hole tubular member for possessing sandwich construction tube wall；Large-scale through hole in tubular member is logical for detection Road；The sandwich construction of the casing includes outer casing, cushion, screen layer and coil layer successively from the outside to the core；The emission lines Circle, receiving coil are at coil layer；The screen layer includes electric field shielding film and/or magnetic field shielding film.
- A kind of 2. highly sensitive SMART METALS detector according to claim 1, it is characterised in that：The intelligent display Terminal is connected with main control module through serial ports；The intelligent display terminal has graphical interfaces, touch-screen and internet communication component, Graphical interfaces and touch-screen are used to carry out parameter setting and show testing result, and the intelligent display terminal can take with internet Business device communication, shared data and progress machine learning.
- A kind of 3. highly sensitive SMART METALS detector according to claim 1, it is characterised in that：The large through-hole pipe Shape part is square tubular member；When metal detection pops one's head in work, part to be checked irreversibly delivers in the sense channel.
- A kind of 4. highly sensitive SMART METALS detector according to claim 1, it is characterised in that：The coil layer bag Include transmitting coil, receiving coil and coil backplate；The coil layer is surround away from screen layer, the transmitting coil, receiving coil Sense channel.
- A kind of 5. highly sensitive SMART METALS detector according to claim 4, it is characterised in that：The receiving coil Including the receiving coil of specification identical first and the second receiving coil, first, second receiving coil is parallel to each other and vertically In sense channel, the transmitting coil is located among the first receiving coil and the second receiving coil.
- A kind of 6. highly sensitive SMART METALS detector according to claim 5, it is characterised in that：The screen layer master Body is plastic layer, electric field shielding film and magnetic field shielding film is provided with inside and outside plastic layer, the electric field shielding film is with resistivity Low material spraying shaping, the magnetic field shielding film is with high magnetic conductive material spray mo(u)lding.
- A kind of 7. highly sensitive SMART METALS detector according to claim 4, it is characterised in that：The outer casing with Stainless steel or plastic shaping；There is prominent plastic column on the outside of the screen layer, have screw thread in post, used between screen layer and outer casing Cushion or the insulation of air-gap and plastic column, and connected and locked by plastic screw column with the screw of dense distribution.
- A kind of 8. highly sensitive SMART METALS detector according to claim 4, it is characterised in that：The coil backplate With plastic shaping, width is provided with coil backplate and is equal to or slightly less than coil diameter, is highly slightly larger than the groove of coil diameter, line Circle is suppressed in embedded groove using the elasticity of plastics, then with epoxy resin sealing.
- A kind of 9. highly sensitive SMART METALS detector according to claim 4, it is characterised in that：The main control module Built-in DSP or MCU main control chips；Main control chip exports square wave to launch driving circuit or launched through DDS chips to the transmitting Drive circuit exports sine wave signal；Push-pull circuit built in the transmitting launch driving circuit is to amplify the ripple that main control module transmits Shape signal；The transmitting launch driving circuit is connected with transmitting coil, and the receiving coil receives the wireless signal of transmitting coil And deliver to main control module after receiving circuit processing；When part to be checked includes metallic foreign body, pass through detection in metallic foreign body During passage, signal phase and amplitude that the first receiving coil, the second receiving coil receive change over time, this change warp Phase sensitive detection, low pass filtered obtain signal waveform after involving amplification, when the peak value of signal waveform is more than default threshold value, master control mould Block sends alarm signal.
- A kind of 10. highly sensitive SMART METALS detector according to claim 9, it is characterised in that：The master control mould Block, launch driving circuit and receiving circuit are divided into different electromagnetic shielding containers.
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| EP3816673A1 (en) * | 2019-10-29 | 2021-05-05 | Sesotec GmbH | Method for operating a combustion engine system |
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| CN107884835B (en) | 2024-04-30 |
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