CN109358369A - A kind of volume body coils formula electromagnetism interference pulse metal detector - Google Patents
A kind of volume body coils formula electromagnetism interference pulse metal detector Download PDFInfo
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- CN109358369A CN109358369A CN201811558844.2A CN201811558844A CN109358369A CN 109358369 A CN109358369 A CN 109358369A CN 201811558844 A CN201811558844 A CN 201811558844A CN 109358369 A CN109358369 A CN 109358369A
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- 239000002184 metal Substances 0.000 title claims abstract description 34
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 34
- 238000001514 detection method Methods 0.000 claims abstract description 22
- 238000004891 communication Methods 0.000 claims description 21
- 238000012545 processing Methods 0.000 claims description 17
- 239000004065 semiconductor Substances 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000003993 interaction Effects 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- 230000003321 amplification Effects 0.000 description 7
- 238000003199 nucleic acid amplification method Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000011835 investigation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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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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Abstract
The present invention discloses a kind of volume body coils formula electromagnetism interference pulse metal detector, is made of detector, slave and host.The detector includes detection frame, anti-external disturbance coil and search coil；Wherein detection frame is made of upper layer annular frame, lower layer's annular frame and at least one insulated connecting rod.Anti- external disturbance coil is fixed on the annular frame of upper layer；Search coil is fixed on lower layer's annular frame.Slave is directly connected to anti-external disturbance coil and search coil.Slave connect connection with host.The present invention realizes that the differential mode of signal inhibits by using 2 groups of coils, to offset the interference of outer signals, improve the detection accuracy of metal detector, accurate detection can be still made in the environment of with complex jamming source (there are high-voltage lines, base station iron tower for such as surrounding).
Description
Technical field
The present invention relates to metal detection technical fields, and in particular to a kind of volume body coils formula electromagnetism interference pulse metal spy
Survey device.
Background technique
Pulsed metal detector is a kind of instrument that investigation depth is very deep, and being very suitable to archaeology may visit and road administration engineering
The application of aspect.Different from other kinds of metal detector, the working principle of pulsed metal detector is: being produced by host
Raw pulse signal goes driving coil to generate powerful of short duration pulse current.Each pulse as caused by coil can produce
A raw magnetic field, and polarity of the magnetic field can be inverted and be collapsed when each end-of-pulsing, therefore a point can be generated on coil
Spike, this peak current duration is very short, referred to as reflected current.If there is metal object is below coil, pulse
After the magnetic field that generates opposite magnetic field can be generated on object, this magnetic field superposition just causes this electricity into reflected current
Slowing for decaying is flowed, host can monitor the length variation of this decay current the moment, by compare be expected to set
Compared with if die-away time is elongated, host is it is determined that be that the die-away time as caused by extraneous metal object is elongated, so that judgement is
There is metal object.
Existing pulsed metal detector is all formed by a multicore cable coiling mostly, i.e., is undertaken simultaneously using unicoil
Transmitting and received task.And unicoil is the ability for not resisting outer signals interference at work, once there is the external world
Interference signal, such as nearby there are when the powerful electromagnetic signal sources such as high-voltage line, wireless transmission tower or base station, be just easy to
Amplified by the front end receiver of pulsed metal detector, and leads to the case where judging by accident.Although by being visited in pulsed metal
Filter is added before or after surveying the front end amplification of device can eliminate this interference electromagnetic wave to a certain extent, but due to
The frontend amplifying circuit of existing pulsed metal detector is all using a highly sensitive amplifier, i.e., only highly sensitive
Degree can just collect the echo-signal of feedback, and these interference electromagnetic waves have destroyed echo-signal completely, since being linked back
Wave signal is all imperfect, and any filter is all invalid, so any metal echo and interference all can be by
Amplification is without the ability of resistance.
Summary of the invention
To be solved by this invention is that existing pulsed metal detector is interfered vulnerable to outer signals and judged by accident
Problem provides a kind of volume body coils formula electromagnetism interference pulse metal detector.
To solve the above problems, the present invention is achieved by the following technical solutions:
A kind of volume body coils formula electromagnetism interference pulse metal detector, is made of detector, slave and host.
The detector includes detection frame, anti-external disturbance coil and search coil；Wherein detection frame is by upper layer ring
Shape frame, lower layer's annular frame and at least one insulated connecting rod composition；Upper layer annular frame and lower layer's annular frame are water
The annular frame of flat setting；Upper layer annular frame is located at the surface of lower layer's annular frame, there is certain height between the two
Difference, and the insulated connecting rod by being uprightly arranged connects；Anti- external disturbance coil is fixed on the annular frame of upper layer；Search coil
It is fixed on lower layer's annular frame.
The slave includes slave shell and the slave processing circuit being arranged in slave shell；Wherein slave processing electricity
Road includes slave microcontroller, metal-oxide-semiconductor, preamplifier, resistance R1-R8, diode D1-D4 and optocoupler composition；Slave micro-control
The one end of the driving pulsewidth modulation end of device processed via resistance R5 connection optocoupler, one end of the other end connection resistance R7 of optocoupler；Electricity
The other end for hindering R7 connects the grid of metal-oxide-semiconductor M1 and one end of resistance R6 simultaneously；The other end of resistance R6 and the source electrode of metal-oxide-semiconductor M1
Connect negative supply；One end of anti-external disturbance coil and search coil, one end of resistance R1 and R2, diode D1 and D4 anode,
And the cathode of diode D2 and D3 are grounded simultaneously；The other end and resistance of the other end connection resistance R1 of anti-external disturbance coil
One end of R3, the input of the cathode, the anode and preamplifier of diode D2 of the other end connection diode D1 of resistance R3 is just
End；The other end of the other end connection resistance R2 of search coil and one end of resistance R4, the other end of resistance R4 connect diode
Anode, the cathode of diode D4 and the input negative terminal of preamplifier of D3；The both ends of resistance R5 connect preamplifier respectively
Input negative terminal and output end；The analog-to-digital conversion collection terminal of the output end connection slave microcontroller of preamplifier；Slave micro-control
Device processed is connected with slave communication module.
The host includes host housing and the Host processing circuit that is arranged in host housing；Host processing circuit by
Host microcontroller, host computer communication module, display screen, feature operation key, audio pulse width modulation module and alarming horn composition；
Display screen and feature operation key are embedded as human-computer interaction interface on the surface of host housing, and with host microcontroller
Device is connected；Host computer communication module is connect with slave communication module, and host computer communication module is connected with host microcontroller；Host micro-control
The output end of device processed is connected via the input terminal of audio pulse width modulation module and alarming horn.
In above scheme, anti-external disturbance coil is identical with the structure and parameter of search coil.
In above scheme, anti-external disturbance coil and the search coil side of being annular or circular ring shape.
In above scheme, difference in height between anti-external disturbance coil and search coil between 50 centimetres to 70 centimetres it
Between.
In above scheme, anti-external disturbance coil mutually insulate with upper layer annular frame, search coil and lower layer's annular frame
Mutually insulate.
In above scheme, anti-external disturbance coil is fixed on the underface of upper layer annular frame, and search coil is fixed on down
The underface of layer annular frame.
In above scheme, host computer communication module and slave communication module are wireless communication module.
Compared with prior art, the present invention has a characteristic that
1, it realizes that the differential mode of signal inhibits by using 2 groups of coils, to offset the interference of outer signals, improves metal
The detection accuracy of survey meter, can be in the environment with complex jamming source (there are high-voltage lines, base station iron tower around such as)
Under, it can still make accurate detection；
2,2 groups of coils are mounted on detection frame, the structure design for detecting frame can effectively take into account the convenience of operation
Property and investigation depth, and the signal of coil effectively and is nondestructively sent in microcontroller and is handled, with into
One step improves detection accuracy.
3, data processing function is split as host and slave to realize, passes through wired or wireless reality between host and slave
Existing data transmission.Since analog signal is no longer needed by very long signal wire, so generated caused by shaking by signal wire
Unstable factor has substantially avoided.And since host and slave have respective MCU, so in the speed of data processing
On will become quite fast.
Detailed description of the invention
Fig. 1 is a kind of functional block diagram of volume body coils formula electromagnetism interference pulse metal detector.
Fig. 2 is the schematic diagram of slave processing circuit.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific example, and referring to attached
Figure, the present invention is described in more detail.
Referring to Fig. 1, a kind of volume body coils formula electromagnetism interference pulse metal detector, including end of probe and host side.Its
Middle end of probe includes detector and slave.Host side includes host.
The detector includes detection frame, anti-external disturbance coil and search coil.It is dry as anti-outside to detect frame
The installation carrier of coil and search coil is disturbed, is mainly connected by upper layer annular frame, lower layer's annular frame and at least one insulation
Extension bar composition.Upper layer annular frame and lower layer's annular frame are horizontally disposed annular frame.Under upper layer annular frame is located at
There is certain difference in height in the surface of layer annular frame, and the insulated connecting rod by being uprightly arranged connects between the two.It is anti-
The main working parts of external disturbance coil and search coil as detector are entwined by a multicore cable respectively,
Circle number is generally 6 circles to 7 circles.Anti- external disturbance coil is fixed on the annular frame of upper layer, and anti-external disturbance coil and upper layer
Annular frame mutually insulate.Search coil is fixed on lower layer's annular frame, and search coil mutually insulate with lower layer annular frame.Line
Circle (including anti-external disturbance coil and search coil) be fixed on corresponding annular frame (including upper layer annular frame and lower layer annular
Frame) on, the surface of corresponding annular frame can be located at, perhaps the underface positioned at corresponding annular frame or winding
On corresponding annular frame.In a preferred embodiment of the invention, external disturbance coil is fixed on the underface of upper layer annular frame,
Search coil is fixed on the underface of lower layer's annular frame.Difference in height between anti-external disturbance coil and search coil is between 50
Centimetre between 70 centimetres, so as to effectively take into account operation and investigation depth.The knot of anti-external disturbance coil and search coil
Structure is identical with parameter, and works in identical phase, realizes that differential mode inhibits.Since anti-external disturbance coil and anti-outside are dry
Coil needs are disturbed to be fixed on detection frame, so the shape of anti-external disturbance coil is identical as the shape of upper layer annular frame,
Search coil is identical as the shape of lower layer's annular frame.In design, annular frame (including upper layer annular frame and lower layer's annular
Frame) namely coil (including anti-external disturbance coil and search coil) size dimension can according to the unit area of detection come
It determines, when the annular size of coil is larger, transmitting pulse is relatively large.Conversely, emitting arteries and veins when the annular size of coil is smaller
It rushes relatively large.In addition, annular frame (including upper layer annular frame and lower layer's annular frame) namely coil (including anti-external disturbance
Coil and search coil) shape can also be determined according to specific design requirement, can for square annular, rectangular annular,
Circular ring shape, polygonal annular, even irregular annular.But in view of pros' annular and rectangular annular are not easy to occur detection extremely
Angle, and preferably.
The slave is fixed on the detector, is mainly handled by slave shell and the slave being arranged in slave shell
Circuit composition.Wherein slave processing circuit includes slave microcontroller, metal-oxide-semiconductor, preamplifier, resistance R1-R8, diode
D1-D4 and optocoupler composition.Referring to fig. 2.
The one end of the driving pulsewidth modulation end of slave microcontroller via resistance R5 connection optocoupler, the other end connection of optocoupler
One end of resistance R7.The other end of resistance R7 connects the grid of metal-oxide-semiconductor M1 and one end of resistance R6 simultaneously.The other end of resistance R6
Negative supply is connect with the source electrode of metal-oxide-semiconductor M1.One end of anti-external disturbance coil and search coil, resistance R1 and R2 one end, two poles
The anode of pipe D1 and D4 and the cathode of diode D2 and D3 are grounded simultaneously.The other end of anti-external disturbance coil connects resistance
The other end of R1 and one end of resistance R3, the other end connection cathode of diode D1 of resistance R3, the anode of diode D2 and preceding
Set the input anode of amplifier.The other end of the other end connection resistance R2 of search coil and one end of resistance R4, resistance R4's
Anode, the cathode of diode D4 and the input negative terminal of preamplifier of other end connection diode D3.Resistance R1 and R2 and line
Circle is in parallel, and as damping resistance, effect is to prevent coil from generating ring.Resistance R3 and R4, as search coil and anti-interference
Coil signal feedback resistance is used for coil feedback signal, while the buffering played before coil signal enters preamplifier is made
With.4 diode D1-D4 are used for coil feedback signal clipping, and limitation enters the amplitude of preamplifier non-inverting input terminal, keeps away
Exempt from coil due to excessively high peak damages amplifier.The both ends of resistance R5 connect the input negative terminal and output of preamplifier respectively
End.Resistance R5 is the feedback resistance of preamplifier, and effect is the amplification factor for determining front end preamplifier.Preposition amplification
The analog-to-digital conversion collection terminal of the output end connection slave microcontroller of device.Slave microcontroller is connected with slave communication module.
The host is hung over surveyor or is placed on detector record point, is mainly existed by host housing and setting
Host processing circuit composition in host housing.Host processing circuit by host microcontroller, host computer communication module, display screen,
Feature operation key, audio pulse width modulation module and alarming horn composition.Display screen and feature operation key are as human-computer interaction
Interface, while being embedded on the surface of host housing, and be connected with host microcontroller.Host computer communication module and slave communication module
It is realized and is connected by wired or wireless way, host computer communication module is connected with host microcontroller.The output of host microcontroller
End is connected via the input terminal of audio pulse width modulation module and alarming horn.
The principle of the present invention is as follows: assuming that their common-mode signal is Vcom, and difference mode signal is there are two signal v1, v2
VDiff.Common-mode signal (amplitude is equal, the identical signal of phase): being exactly the jointly owned part of the two signals: Vcom=
(v1+v2)/2；Difference mode signal (amplitude is equal, the signal of opposite in phase): being exactly the part that the two signals respectively possess: right
In v1, VDiff=(v1-v2)/2；For v2, VDiff=- (v1-v2)/2；By the signal that preamplifier is exported, packet
Contain the echo-signal being destroyed and interference electromagnetic signal, because the present invention forms differential amplification using 2 coils, forms one
The mode of differential mode signal transmission solves the interference problem in detection process.
In use, operator need to only mention detector, and allow lower layer's annular frame of detector to leave ground certain distance,
Balance is kept slowly to walk in region to be measured.At this point, microcontroller issues driving pulse, and go to drive simultaneously via metal-oxide-semiconductor
Anti- external disturbance coil and search coil, anti-external disturbance coil and search coil generate powerful of short duration pulse electricity simultaneously
Stream, both work is under same phase.There are when metal object immediately below detector, anti-external disturbance coil and detection
The reflected current of coil changes, and host receives the reflection that anti-external disturbance coil and search coil are fed back simultaneously
After electric current, it is sent in microcontroller after resistance R1-R5, diode D1-D4 and preamplifier amplify.It is micro-
Controller MCU carries out differential modes to 2 reflected currents and inhibits after calculating, the reflected current signal after the interference that is inhibited, and by this
Reflected current signal after one inhibition interference is compared be expected to set, if die-away time is elongated, host
Judgement is that the die-away time as caused by extraneous metal object is elongated, so that judgement is that have metal object.When metal object enters detection
In the range of frame, host will make a sound alarm sounds.
It is realized by host with slave in addition, the present invention splits function all inside existing host, host and slave
Between pass through wired or wireless realization data transmit.Impulse ejection, front end amplification and ADC acquisition are transferred to slave up, slave
It can be directly anchored on detection frame, so received analog echo signal of search coil only needs a bit of very short line
(about several centimetres) enter the front end amplification inside slave, and then collected front end signal is converted into digital signal by ADC, these
Digital signal is sent on host by wired or wireless way transmission again, and host only needs the digital signal received to pass through
Processing, it is then corresponding to issue alarm sound.Because of the signal wire that coil analog signal collected no longer needs to grow very much, institute
It has substantially been avoided caused by shake by the unstable factor that signal wire generates.And since host and slave have respectively
MCU, so will become quite fast in the speed of data processing, and the processing of the task of host will also become very simple,
Keystroke handling and display screen display function information are only needed, some parameters for requiring slave to be adjusted, such as tranmitting frequency is connect
Sensitivity, power etc. are received, is sent to slave, then collected data are sent to host again by slave, and last host only needs handle
The data conversion received is at alert audio.
It should be noted that although the above embodiment of the present invention be it is illustrative, this be not be to the present invention
Limitation, therefore the invention is not limited in above-mentioned specific embodiment.Without departing from the principles of the present invention, all
The other embodiment that those skilled in the art obtain under the inspiration of the present invention is accordingly to be regarded as within protection of the invention.
Claims (7)
1. a kind of volume body coils formula electromagnetism interference pulse metal detector, characterized in that by detector, slave and host groups
At；
The detector includes detection frame, anti-external disturbance coil and search coil；Wherein detection frame is by upper layer ring frame
Frame, lower layer's annular frame and at least one insulated connecting rod composition；Upper layer annular frame and lower layer's annular frame are that level is set
The annular frame set；Upper layer annular frame is located at the surface of lower layer's annular frame, there is certain difference in height between the two, and
It is connected by the insulated connecting rod being uprightly arranged；Anti- external disturbance coil is fixed on the annular frame of upper layer；Search coil is fixed
On lower layer's annular frame；
The slave includes slave shell and the slave processing circuit that is arranged in slave shell；Wherein slave processing circuit includes
Slave microcontroller, metal-oxide-semiconductor, preamplifier, resistance R1-R8, diode D1-D4 and optocoupler composition；Slave microcontroller
Drive pulsewidth modulation end via one end of resistance R5 connection optocoupler, one end of the other end connection resistance R7 of optocoupler；Resistance R7's
The other end connects the grid of metal-oxide-semiconductor M1 and one end of resistance R6 simultaneously；The other end of resistance R6 and the source electrode of metal-oxide-semiconductor M1 connect negative electricity
Source；One end of anti-external disturbance coil and search coil, one end of resistance R1 and R2, diode D1 and D4 anode and two
The cathode of pole pipe D2 and D3 are grounded simultaneously；Anti- external disturbance coil the other end connection resistance R1 the other end and resistance R3 one
End, cathode, the anode of diode D2 and the input anode of preamplifier of the other end connection diode D1 of resistance R3；Detection
The other end of the other end connection resistance R2 of coil and one end of resistance R4, the sun of the other end connection diode D3 of resistance R4
Pole, the cathode of diode D4 and preamplifier input negative terminal；The input that the both ends of resistance R5 connect preamplifier respectively is negative
End and output end；The analog-to-digital conversion collection terminal of the output end connection slave microcontroller of preamplifier；Slave microcontroller with
Slave communication module is connected；
The host includes host housing and the Host processing circuit that is arranged in host housing；Host processing circuit is micro- by host
Controller, host computer communication module, display screen, feature operation key, audio pulse width modulation module and alarming horn composition；Display screen
With feature operation key as human-computer interaction interface, while being embedded on the surface of host housing, and be connected with host microcontroller；
Host computer communication module is connect with slave communication module, and host computer communication module is connected with host microcontroller；Host microcontroller
Output end is connected via the input terminal of audio pulse width modulation module and alarming horn.
2. a kind of volume body coils formula electromagnetism interference pulse metal detector according to claim 1, characterized in that anti-outer
Interfere coil identical with the structure and parameter of search coil in portion.
3. a kind of volume body coils formula electromagnetism interference pulse metal detector according to claim 1 or 2, characterized in that
Anti- external disturbance coil and the search coil side of being annular or circular ring shape.
4. a kind of volume body coils formula electromagnetism interference pulse metal detector according to claim 1, characterized in that anti-outer
Interfere the difference in height between coil and search coil between 50 centimetres to 70 centimetres in portion.
5. a kind of volume body coils formula electromagnetism interference pulse metal detector according to claim 1, characterized in that anti-outer
Portion's interference coil mutually insulate with upper layer annular frame, and search coil mutually insulate with lower layer's annular frame.
6. a kind of volume body coils formula electromagnetism interference pulse metal detector according to claim 1, characterized in that anti-outer
Portion's interference coil is fixed on the underface of upper layer annular frame, and search coil is fixed on the underface of lower layer's annular frame.
7. a kind of volume body coils formula electromagnetism interference pulse metal detector according to claim 1, characterized in that host
Communication module and slave communication module are wireless communication module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811558844.2A CN109358369B (en) | 2018-12-19 | 2018-12-19 | Three-dimensional coil type anti-electromagnetic interference pulse metal detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811558844.2A CN109358369B (en) | 2018-12-19 | 2018-12-19 | Three-dimensional coil type anti-electromagnetic interference pulse metal detector |
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| CN109358369A true CN109358369A (en) | 2019-02-19 |
| CN109358369B CN109358369B (en) | 2024-04-26 |
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|---|---|---|---|---|
| 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 |
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| CN102053280A (en) * | 2010-11-10 | 2011-05-11 | 吉林大学 | Nuclear magnetic resonance ground water detection system with reference coils and detection method |
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| CN204116623U (en) * | 2014-09-17 | 2015-01-21 | 上海兰宝传感科技股份有限公司 | Anti-strong jamming inductance type transducer |
| CN204989498U (en) * | 2015-04-16 | 2016-01-20 | 漳州市东方智能仪表有限公司 | Mirror image difference formula underground metal detector |
| CN208044084U (en) * | 2018-03-21 | 2018-11-02 | 无锡市星迪仪器有限公司 | A kind of metal detector with distance detection |
| CN209231532U (en) * | 2018-12-19 | 2019-08-09 | 冯家森 | A kind of volume body coils formula electromagnetism interference pulse metal detector |
-
2018
- 2018-12-19 CN CN201811558844.2A patent/CN109358369B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN1834690A (en) * | 2006-04-12 | 2006-09-20 | 郭有军 | Through type metal detecting system |
| CN102053280A (en) * | 2010-11-10 | 2011-05-11 | 吉林大学 | Nuclear magnetic resonance ground water detection system with reference coils and detection method |
| CN103197352A (en) * | 2013-03-12 | 2013-07-10 | 武汉大学 | Multifunctional wall body detecting instrument |
| CN204116623U (en) * | 2014-09-17 | 2015-01-21 | 上海兰宝传感科技股份有限公司 | Anti-strong jamming inductance type transducer |
| CN204989498U (en) * | 2015-04-16 | 2016-01-20 | 漳州市东方智能仪表有限公司 | Mirror image difference formula underground metal detector |
| CN208044084U (en) * | 2018-03-21 | 2018-11-02 | 无锡市星迪仪器有限公司 | A kind of metal detector with distance detection |
| CN209231532U (en) * | 2018-12-19 | 2019-08-09 | 冯家森 | A kind of volume body coils formula electromagnetism interference pulse metal detector |
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| Publication number | Publication date |
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| CN109358369B (en) | 2024-04-26 |
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