CN109375274A - A kind of wireless type pulse metal detector - Google Patents
A kind of wireless type pulse metal detector Download PDFInfo
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- CN109375274A CN109375274A CN201811555934.6A CN201811555934A CN109375274A CN 109375274 A CN109375274 A CN 109375274A CN 201811555934 A CN201811555934 A CN 201811555934A CN 109375274 A CN109375274 A CN 109375274A
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- 239000002184 metal Substances 0.000 title claims abstract description 28
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 238000012545 processing Methods 0.000 claims abstract description 17
- 239000004065 semiconductor Substances 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000003993 interaction Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 9
- 230000003321 amplification Effects 0.000 abstract description 6
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 6
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- 230000002159 abnormal effect Effects 0.000 description 1
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- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
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- 238000000465 moulding 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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- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Geophysics And Detection Of Objects (AREA)
Abstract
The present invention discloses a kind of wireless type pulse metal detector, is made of detector, slave and host.Function all inside existing host is split and is realized by host with slave by the present invention, by wirelessly realizing data transmission between host and slave.Impulse ejection, front end amplification and ADC acquisition are transferred to slave up, slave can be directly anchored on detection frame, the received echo-signal of search coil only needs a bit of very short line to enter the amplification of the front end inside slave in this way, then collected front end signal is converted into digital signal by ADC, these digital signals pass through wireless transmission again and are sent on host, host is only needed the digital signal received by processing, then corresponding to issue alarm sound.The full Wirelessization of a mode in this way, the detectable signal and host that are achieved that coil connects, and operability, the stability of complete machine are brought into play in optimal manner.
Description
Technical field
The present invention relates to metal detection technical fields, and in particular to a kind of wireless type pulse metal detector.
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 mainly made of detector and host.Detector includes search coil and detection frame
Frame, search coil are formed by a multicore cable coiling, and are fixed on detection frame made of pvc pipe.Host is to hang over work
Make with personnel, is connected between search coil and host by the signal wire of one very long (at least 2 meters or more), then work
Detector is mentioned as personnel to detect with normal walking speed in region to be measured, is made with finding underground metal pipes or archaeology
Industry.The pulsed metal detector of this structure is very seriously drawback there are one: having one 2 between search coil and host
Exist to 3 meters of very long signal wires, and search coil and signal wire be in host interior forward end amplifier most before
End part, signal wire in a disguised form have been known as a part of search coil, i.e. signal wire and search coil has collectively constituted a pole
Spend sensitive echo reception device.Staff mentions during detector walks about, once with ground flowers and plants branch etc
It scratches, signal wire is inevitably to shake.Search coil signal collected can be generated when shaking larger
Interference, and acquisition signal is made to be abnormal fluctuation, this unusual fluctuations is after the amplification of host interior forward end amplifier, finally
Will lead to host and issue false alarm, so that staff be allowed to do the judgement to make mistake, and cause to dig when pipeline construction it is wrong or
Person digs deviation and sets, and causes security risk.
In addition, existing pulsed metal detector is all formed by a multicore cable coiling mostly, i.e., it is same using unicoil
When undertake transmitting and received task.And unicoil is the ability for not resisting outer signals interference at work, once
There is extraneous interference signal, such as nearby there are when the powerful electromagnetic signal sources such as high-voltage line, wireless transmission tower or base station, just
It is easy to the case where being amplified by the front end receiver of pulsed metal detector, also resulting in erroneous judgement generation.
Summary of the invention
To be solved by this invention is existing pulsed metal detector because detector and host are carried out using long signal wire
The problem of connecting and being easy to happen erroneous judgement provides a kind of wireless type pulse metal detector.
To solve the above problems, the present invention is achieved by the following technical solutions:
A kind of wireless type pulse metal detector, characterized in that be made of detector, slave and host；
The detector includes detection frame and search coil；Detection frame is horizontally disposed annular frame, detects line
Circle is fixed on detection frame.
The slave includes slave shell and the slave processing circuit that is arranged in slave shell；Slave processing circuit is by pair
Machine microcontroller, slave wireless module, metal-oxide-semiconductor M1, preamplifier, resistance R1-R7, diode D1-D2 and optocoupler composition；It is secondary
Machine microcontroller drives pulsewidth modulation end via one end of resistance R5 connection optocoupler, and the other end of optocoupler connects the one of resistance R7
End；The other end of resistance R7 connects the grid of metal-oxide-semiconductor M1 and one end of resistance R6 simultaneously；The other end and metal-oxide-semiconductor M1 of resistance R6
Source electrode connect negative supply；Wherein one end of search coil connects the drain electrode of metal-oxide-semiconductor M1, wherein one end of resistance R1 and R2 simultaneously；
The other end of search coil simultaneously connects the other end of resistance R1, the cathode of diode D1, the anode of diode D2, resistance R3
Wherein one end and ground；After the other end of resistance R2 is connected with the cathode of the anode of diode D1 and diode D2, with preposition amplification
The input negative terminal of device connects；The other end of resistance R3 and the input anode of preamplifier connect；The both ends of resistance R4 connect respectively
Connect the input negative terminal and output end of preamplifier；The analog-to-digital conversion of the output end connection slave microcontroller of preamplifier is adopted
Collect end；Slave microcontroller is connected with slave wireless module.
The host includes host housing and the Host processing circuit that is arranged in host housing；Host processing circuit is by leading
Machine microcontroller, host wireless module, display screen, feature operation key, audio pulse width modulation module and alarming horn composition；It is aobvious
Display screen and feature operation key are embedded as human-computer interaction interface on the surface of host housing, and and host microcontroller
It is connected；Host wireless module and slave wireless module wireless communication connect, and host wireless module is connected with host microcontroller；It is main
The output end of machine microcontroller is connected via the input terminal of audio pulse width modulation module and alarming horn.
In above scheme, search coil is side's annular or circular ring shape.
In above scheme, search coil is fixed on the lower section of detection frame.
Compared with prior art, function all inside existing host is split and is realized by host with slave by the present invention,
By wirelessly realizing data transmission between host and slave.Impulse ejection, front end amplification and ADC acquisition are transferred to slave up,
Slave can be directly anchored on detection frame, and so received analog echo signal of search coil only needs a bit of very short
Line (about several centimetres) enters the front end amplification inside slave, and then collected front end signal is converted into digital signal by ADC, this
A little digital signals pass through wireless transmission again and are sent on host, and host is only needed the digital signal received by processing, so
It is corresponding afterwards to issue alarm sound.Because of the signal wire that search coil analog signal collected no longer needs to grow very much,
It has substantially been avoided caused by shaking by the unstable factor that signal wire generates.And due to host and slave have it is respective
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, only
Keystroke handling and display screen display function information are needed, some parameters for requiring slave to be adjusted, such as tranmitting frequency is received
Sensitivity, power etc. are sent to slave, and then collected data are sent to host again by slave, and last host only need to be connecing
The data conversion received is at alert audio.A mode in this way, is achieved that the detectable signal and host of coil
Full Wirelessization connection, operability, the stability of complete machine are brought into play in optimal manner.
Detailed description of the invention
Fig. 1 is a kind of functional block diagram of wireless type 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 wireless type pulse metal detector is mainly made of detector, slave and host.
The detector includes detection frame and search coil.Detection frame is horizontally disposed annular frame.Detect frame
Installation carrier of the frame as search coil, is mainly made of isolation material.Main body of the search coil as detector, by more than one
Core cable is entwined, and circle number is generally 6 circles to 7 circles.Search coil is fixed on detection frame, can be located at detection frame
The surface of frame, perhaps positioned at detection frame underface or be wrapped in detection frame on.In the preferred embodiment of the present invention
In, search coil is fixed on the underface of detection frame.The shape and size of search coil are identical as detection frame.It is designing
When, the size dimension for detecting frame namely search coil can be determined according to the unit area of detection, when the ring of search coil
When shape size is larger, transmitting pulse is relatively large.Conversely, transmitting pulse is relatively large when the annular size of search coil is smaller.Separately
Outside, detecting frame namely the shape of search coil can also determine according to specific design requirement, can be square annular, length
Side annular, circular ring shape, polygonal annular, even irregular annular.But in view of square annular and rectangular annular are not easy
Dead angle is now detected, and preferably.
The slave is fixed on the detector comprising slave shell and the slave being arranged in slave shell processing electricity
Road.Slave processing circuit is by slave microcontroller, slave wireless module, metal-oxide-semiconductor M1, preamplifier, resistance R1-R7, two poles
Pipe D1-D2 and optocoupler composition.Slave microcontroller driving pulsewidth modulation end via resistance R5 connection optocoupler one end, optocoupler
One end of other end connection resistance R7.The other end of resistance R7 connects the grid of metal-oxide-semiconductor M1 and one end of resistance R6 simultaneously.Resistance
The other end of R6 and the source electrode of metal-oxide-semiconductor M1 connect negative supply.Wherein one end of search coil connects drain electrode, the electricity of metal-oxide-semiconductor M1 simultaneously
Hinder wherein one end of R1 and R2.The other end of search coil connects the other end of resistance R1, the cathode of diode D1, two poles simultaneously
The anode of pipe D2, wherein one end of resistance R3 and ground.The yin of the other end of resistance R2 and the anode of diode D1 and diode D2
After being extremely connected, it is connect with the input negative terminal of preamplifier.The other end of resistance R3 and the input anode of preamplifier connect.
The both ends of resistance R4 are separately connected the input negative terminal and output end of preamplifier.The output end connection slave of preamplifier is micro-
The analog-to-digital conversion collection terminal of controller.Slave microcontroller is connected with slave wireless module.Referring to fig. 2.
The host is hung on the body of surveyor or is fixed at detection record point, including host housing and setting are in master
Host processing circuit composition in machine shell.Host processing circuit is by host microcontroller, host wireless module, display screen, function
It can operation button, audio pulse width modulation module and alarming horn composition.Display screen and feature operation key are as human-computer interaction circle
Face, while being embedded on the surface of host housing, and be connected with host microcontroller.Host wireless module and slave wireless module without
Line communication connection, host wireless module are connected with host microcontroller.The output end of host microcontroller is via audio pulsewidth tune
The connection of the input terminal of molding block and alarming horn.
Host wireless module and slave wireless module wireless communication connect.In the present invention, host wireless module and slave
Wireless module is all made of 2.4G wireless data transmission scheme, i.e. host wireless module and slave wireless module is all made of NRF24L01
Chip can be automatically set as needed transmission or reception pattern at any time by microcontroller.NRF24L01 chip operation exists
2.4~2.5GHz exempts from the whole world to apply for ISM band, it one shares 125 channels, can realize 1 by changing channel and address
To the mutual biography more than 1 or 1 pair, have automatic-answering back device and automatic retransmitting function, data transmission rate 1 or 2Mbps, SPI interface data
0~8Mbps of rate, address and CRC check function.Since NRF24L01 chip is to realize connection by channel and address,
After host is good the address matching of slave, it is only and communication is established in this address, and other any channel address all will not
It is impacted, confidentiality is very high, and each channel can establish numerous address.Just because of it have it is numerous excellent
Point, so we use core of this chip as wireless data transmission.
In use, operator need to only mention detector, and allow the detection frame of detector to leave ground certain distance, keep
Balance is slowly walked in region to be measured.At this point, slave microcontroller issues driving pulse, and go to drive simultaneously via metal-oxide-semiconductor M1
Search coil, search coil generate powerful of short duration pulse current simultaneously, both work is under same phase.Work as detector
Underface there are when metal object, the reflected current of search coil changes, and slave microcontroller receives search coil
After the reflected current fed back, preamplifier is sent in slave microcontroller after amplifying.Slave microcontroller
Data are sent to host microcontroller by slave wireless module and host wireless module.Host microcontroller is by reflected current
With being compared for expected setting, if die-away time is elongated, host microcontroller is it is determined that drawn by extraneous metal object
The die-away time risen is elongated, so that judgement is that have metal object.In the range of metal object enters detection frame, host microcontroller
Device control alarming horn will make a sound alarm sounds.
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 (3)
1. a kind of wireless type pulse metal detector, characterized in that be made of detector, slave and host；
The detector includes detection frame and search coil；Detection frame is horizontally disposed annular frame, and search coil is solid
It is scheduled on detection frame；
The slave includes slave shell and the slave processing circuit that is arranged in slave shell；Slave processing circuit is micro- by slave
Controller, slave wireless module, metal-oxide-semiconductor M1, preamplifier, resistance R1-R7, diode D1-D2 and optocoupler composition；Slave is micro-
The one end of the driving pulsewidth modulation end of controller via resistance R5 connection optocoupler, one end of the other end connection resistance R7 of optocoupler；
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 and the source of metal-oxide-semiconductor M1
Pole connects negative supply；Wherein one end of search coil connects the drain electrode of metal-oxide-semiconductor M1, wherein one end of resistance R1 and R2 simultaneously；Detection
The other end of coil connects the other end of resistance R1, the cathode of diode D1, the anode of diode D2, resistance R3 wherein simultaneously
One end and ground；After the other end of resistance R2 is connected with the cathode of the anode of diode D1 and diode D2, with preamplifier
Input negative terminal connection；The other end of resistance R3 and the input anode of preamplifier connect；Before the both ends of resistance R4 are separately connected
Set the input negative terminal and output end of amplifier；The analog-to-digital conversion acquisition of the output end connection slave microcontroller of preamplifier
End；Slave microcontroller is connected with slave wireless module；
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 wireless 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 wireless module and slave wireless module wireless communication connect, and host wireless module is connected with host microcontroller；Host is micro-
The output end of controller is connected via the input terminal of audio pulse width modulation module and alarming horn.
2. a kind of wireless type pulse metal detector according to claim 1, characterized in that search coil be side annular or
Circular ring shape.
3. a kind of wireless type pulse metal detector according to claim 1 or 2, characterized in that search coil is fixed on
Detect the lower section of frame.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811555934.6A CN109375274A (en) | 2018-12-19 | 2018-12-19 | A kind of wireless type pulse metal detector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811555934.6A CN109375274A (en) | 2018-12-19 | 2018-12-19 | A kind of wireless type pulse metal detector |
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| CN109375274A true CN109375274A (en) | 2019-02-22 |
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| CN201811555934.6A Pending CN109375274A (en) | 2018-12-19 | 2018-12-19 | A kind of wireless type pulse metal detector |
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