CN108227022A - Air-ground magnetic resonance detection device and detection method based on SQUID - Google Patents
Air-ground magnetic resonance detection device and detection method based on SQUID Download PDFInfo
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- CN108227022A CN108227022A CN201711483495.8A CN201711483495A CN108227022A CN 108227022 A CN108227022 A CN 108227022A CN 201711483495 A CN201711483495 A CN 201711483495A CN 108227022 A CN108227022 A CN 108227022A
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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
- G01V3/14—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electron or nuclear magnetic resonance
Abstract
The present invention relates to a kind of air-ground magnetic resonance detection device based on SQUID, including：Transmitter connects transmitting coil by a transmitting control switching circuit, DC current, which is passed through, to transmitting coil generates pre-polarizing magnetic field, increase body of groundwater in the Hydrogen Proton intensity of magnetization and to transmitting coil be passed through Larmor frequency alternating current excite Hydrogen Proton precession, stop excitation current, Hydrogen Proton generates relaxation phenomena under geomagnetic field action；SQUID receives magnetic resonance signal, connects SQUID reading circuits, and the SQUID magnetic signals acquired are converted into electric signal；Receiver carries on board the aircraft, is connect with SQUID reading circuits；Host computer is sent out to communicate between the receiver and transmitter and be connected, and sends out control signal, and control transmitter emits the switching and shutdown of straight A.C. current, controls and receives acquisition of the machine to signal.Advantage investigative range of the present invention is big, efficient, and environmental suitability is strong, and has both the advantages such as highly sensitive and signal-to-noise ratio.
Description
Technical field
The present invention relates to a kind of magnetic resonance (Nuclear Magnetic Resonance, NMR) prospecting instrument and method, especially
It is a kind of based superconductive quantum interference device (Superconducting QUantum Interference Devices,
SQUID air-ground magnetic resonance underground water detecting devices and detection method).
Background technology
Mr techniques are applied to the history that underground water detection has decades, possess direct detection, quantitative and qualitative, resolution
The advantages that rate is higher is widely used in industrial or agricultural and the detection of civilian phreatic water, high efficiency region hydrogeological investigation etc.
Aspect.Nowadays widely applied ground magnetic resonance detection method, by being laid with tens to hundreds of meters transmitting coil on ground, and
The corresponding one or more receiving coils of matching, complete the groundwater exploration of one or more dimensions and imaging in search coverage.But
The ground surface environments such as some mountainous regions, hills are complicated, the widely distributed area of water body, be laid with multiple large-sized receiving coil difficulty compared with
Greatly, and investigative range is limited, and for such case, the magnetic resonance underground water detection method that development is suitable for complex environment is that have very much
It is necessary.
Patent CN106908847A discloses " a kind of air-ground nuclear magnetic resonance underground water detection system and detection method ", passes through
Communication module connects ground master control system and airborne aircraft, and ground transmitter is by changing the emission current of grounding electrode to ground
Lower tranmitting frequency is the excitation current of local Larmor frequency, be mounted in carry-on receiving coil acquire macroscopic moment into
The NMR signal of movable property life, transmitting and stopping of the ground master control system through communication module remote control excitation current, and control
It makes the receiver being connect with receiving coil and acquires NMR signal, collected nuclear magnetic resonance in the gap that excitation current stops
Signal will reach host computer by communication module.Patent CN106873044A discloses a kind of " array SQUID nuclear magnetic resonance
Lower water detection device and imaging method " generates pre-polarizing magnetic of the magnetic strength intensity much larger than natural earth's magnetic field using pre-polarizing coil
, so as to improve the Overall magnetization intensity of water body, receiving coil is replaced to acquire signal using the high SQUID of magnetic field sensitivity,
Faint seismic electrical signal can be detected, collects more accurate magnetic field signal, and then improve signal-to-noise ratio, realization can be
The imaging method of underground nuclear magnetic resonance detection is carried out under strong noise environment.
The air-ground nuclear magnetic resonance underground water detection system and detection method of foregoing invention, for the complicated ring such as mountainous region, hills
The detection of underground water under border, it is proposed that air-ground magnetic resonance detection method preferably resolves the laying problem of receiving coil, visits
It is wide, efficient to survey range, but since its receiving coil size is by aircraft carrying energy power limit, depth of investigation is limited, and is flying
In row device flight course, a large amount of electrical noise is introduced, it is difficult to ensure the noise detected when reliability；And array SQUID
Nuclear magnetic resonance underground water detecting device and imaging method improve magnetic resonance signal amplitude, with height by applying prepolarizing field
The SQUID detections of sensitivity, have evaded relatively conventional electrical noise interference, more can significantly improve detection signal-to-noise ratio, but
It detects form constrained in ground location, and detection efficient is relatively low, and receives system and be made of multiple SQUID sensors, and wiring is multiple
Miscellaneous, cost is higher, is not suitable for the hydrogeologic prospecting of large-scale area.
Invention content
In order to solve to connect up complexity in the prior art, cost is higher, is not suitable for the hydrogeologic prospecting of large-scale area
The problem of, the present invention provides a kind of air-ground magnetic resonance detection device based on SQUID,
Another aspect of the present invention additionally provides a kind of air-ground magnetic resonance detection method based on SQUID.
The purpose of the present invention is achieved through the following technical solutions：
Air-ground magnetic resonance detection device based on SQUID, including：
Transmitter connects transmitting coil by a transmitting control switching circuit, and being passed through DC current to transmitting coil generates
Pre-polarizing magnetic field increases the Hydrogen Proton intensity of magnetization and shutdown DC current in body of groundwater and is passed through Larmor to transmitting coil
The alternating current excitation Hydrogen Proton movement of frequency, stops excitation current, Hydrogen Proton generates relaxation phenomena under geomagnetic field action；
SQUID receives the magnetic resonance signal that Hydrogen Proton relaxation generates, and connects SQUID reading circuits, by SQUID acquisitions
Magnetic signal is converted into electric signal；
Receiver is mounted on an aircraft, is connect with the SQUID reading circuits；
Connection is communicated between host computer, with the receiver and transmitter, control signal is sent out, controls the transmitter
The switching and shutdown of ac and dc current transmitting, control acquisition of the receiver to signal.
Further, the transmitter includes：
Adjustable DC radiating circuit, connects the transmitting control switching circuit, and DC current is provided for the transmitting coil；
Adjustable exchange radiating circuit, connects the transmitting control switching circuit, and alternating current is provided for the transmitting coil；
Emit main control unit, receive the control signal of the host computer, to the adjustable DC radiating circuit and adjustable
Exchange radiating circuit is controlled.
Further, the receiver includes：
Amplifying circuit is connect with the SQUID reading circuits, and the electric signal of SQUID reading circuits output is amplified；
A/D collecting units connect the amplifying circuit and are converted into digital signal to amplified signal；
Receive main control unit, receive the signals of the A/D collecting units, by between wireless communication module and host computer into
The transmission of row signal controls the SQUID collecting magnetic resonance signals.
Further, the aircraft flies at a constant speed along survey line, the survey line and topographic features to be measured and transmitting coil ruler
It is very little to match.
The detection method of air-ground magnetic resonance detection device based on SQUID,
Control the switching and shutdown of the transmitter ac and dc current transmitting；
Transmitting coil is connected by a transmitting control switching circuit, being passed through DC current to transmitting coil generates pre-polarizing magnetic
, increase the friendship that the Hydrogen Proton intensity of magnetization and shutdown DC current in body of groundwater are passed through Larmor frequency to transmitting coil
The excitation Hydrogen Proton movement of galvanic electricity stream, stops excitation current, Hydrogen Proton generates relaxation phenomena under geomagnetic field action；
The magnetic resonance signal of Hydrogen Proton relaxation generation is received by superconductive quantum interference mode, the magnetic signal of receiving is converted
For electric signal；
Acquisition electric signal is received, signal is handled, is wirelessly transmitted in host computer and is stored.
Further, the switching of the control transmitter ac and dc current transmitting and turn off process：
Adjustable DC radiating circuit is controlled to provide transmitting coil DC current, keeps cut-off current after a period of time；
Adjustable exchange radiating circuit is controlled to provide transmitting coil alternating current, keeps cut-off current after a period of time.
Further, include the following steps：
A, transmitting coil is laid in detection target area, and according to actual measurement situation and transmitting coil size, determines survey line, fly
Row device speed and flying height；
B, it connection and debugs transmitting and receives circuit, ensure the normal communication of host computer and transmitter, receiver, aircraft
Drive into survey line；
C, the transmitting main control unit inside PC control transmitter connects adjustable DC radiating circuit, and passes through transmitting
Control switching circuit is passed through transmitting coil Constant Direct Current electric current, keeps cut-off current after a period of time；
D, after DC current shutdown, the transmitting main control unit inside PC control transmitter connects adjustable exchange transmitting
Circuit, and pass through and emit the Larmor frequency alternating current that control switching circuit is passed through transmitting coil certain amplitude, kept for one section
It is turned off after time；
E, alternating current shutdown moment, aircraft keeps constant height and speed is flown along survey line, and host computer passes through communication
The reception main control unit that module is controlled and received inside machine starts to acquire signal；
F, the magnetic resonance signal of SQUID acquisitions amplifies by amplifying circuit, collects data by A/D collecting units and connects
Receive main control unit；
G, it receives main control unit and host computer is passed data to by communication module.
Further, to be passed through transmitting coil Constant Direct Current electric current constant for direct current in the step c, according to transmitting coil size,
The number of turn and detection target change alternating current size, repeat c-g processes, complete the measurement of different pulse squares.
Beneficial effects of the present invention：
1st, the present invention can effectively increase Hydrogen Proton macroscopic moment in underground water by applying prepolarizing field, increase indirectly
Magnetic resonance signal, improves detection signal-to-noise ratio；In underground water magnetic signal, prior art patent are discharged after Hydrogen Proton excitation
What the coil in 201710130504.9 received is the electric signal sensed according to magnetic signal, and SQUID is direct in the present invention
Magnetic signal is received, according to Faraday's electromagnetic induction law, electric field is the derivative in magnetic field, directly receives magnetic field, can effectively be broken through
The bottleneck of magnetic resonance 150m detection ranges；SQUID is inherently better than line as superconduction receiver for the sensitivity level in magnetic field
Enclose the sensitivity level to electromagnetic field.
2nd, the present invention is based on the air-ground magnetic resonance detection devices and detection method of SQUID, make using highly sensitive SQUID
For magnetic resonance signal receiver, the reliability of detection is increased.Compared with prior art, not only investigative range is big, efficient, ring
Border is adaptable, and has both the advantages such as highly sensitive and signal-to-noise ratio, and mr techniques are further applied and promoted with weight
Big meaning.
3rd, the present invention is based on the air-ground magnetic resonance detection devices and detection method of SQUID to be suitable for Complex Mountain, hills etc.
Regional a wide range of, high s/n ratio groundwater exploration, promotes magnetic resonance detection efficiency.
Description of the drawings
Fig. 1 is the air-ground magnetic resonance detection device field work schematic diagram based on SQUID
Fig. 2 is the air-ground magnetic resonance detection device transmitter system block diagram based on SQUID
Fig. 3 is the air-ground magnetic resonance detection device receiver system block diagram based on SQUID
Wherein：1st, host computer, 2, transmitter, 3, transmitting coil, 4, wireless communication module, 5, aircraft, 6, receiver, 7,
SQUID, 8, survey line, 9, transmitting main control unit, 10, adjustable DC radiating circuit, 11, adjustable exchange radiating circuit, 12, transmitting cuts
Change control circuit, 13, SQUID reading circuits, 14, amplifying circuit, 15, A/D collecting units, 16, receive main control unit.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present invention provides a kind of air-ground magnetic resonance detection device based on SQUID7, which includes：Transmitter 2 receives
Machine 6, host computer 1, wireless communication module 4, transmitting coil 3, SQUID7 and aircraft 5, the transmitter 1 pass through a transmitting
Control switching circuit 12 connects transmitting coil, and being passed through DC current to transmitting coil 3 generates pre-polarizing magnetic field, increases body of groundwater
The alternating current that the middle Hydrogen Proton intensity of magnetization and shutdown DC current are passed through Larmor frequency to transmitting coil excites Hydrogen Proton
Movement, stops excitation current, and Hydrogen Proton generates relaxation phenomena under geomagnetic field action；The SQUID7 receives the production of Hydrogen Proton relaxation
The SQUID7 magnetic signals acquired are converted into electric signal by raw magnetic resonance signal, connection SQUID reading circuits 13；The reception
Machine 6 is mounted on the aircraft 5, connects the SQUID reading circuits 13；Host computer 1 and the receiver 6 and transmitter
Communication connection, sends out control signal between 2, the switching and shutdown that 2 ac and dc current of transmitter is controlled to emit, described in control
Acquisition of the receiver 6 to signal.The wireless communication module 4 completes the signal transmission between host computer 1 and reception.
Transmitter 2 includes：Adjustable DC radiating circuit 10, adjustable exchange radiating circuit 11, transmitting main control unit 9 and hair
Control switching circuit 12 is penetrated, wherein adjustable DC radiating circuit 10 connects the transmitting control switching circuit 12；Adjustable exchange hair
Transmit-receive radio road 11 connects the transmitting control switching circuit 12；Transmitting main control unit 9 receives the control signal of the host computer 1, right
The adjustable DC radiating circuit 10 and adjustable exchange radiating circuit 11 are controlled.2 internal emission main control unit 9 of transmitter
Adjustable DC radiating circuit 10 is controlled, 3 DC current of transmitting coil is passed through by emitting control switching circuit 12, generates pre-polarizing
Magnetic field increases the Hydrogen Proton intensity of magnetization in body of groundwater, then turns off DC current, 2 inside of transmitter is controlled to send out by host computer 1
It penetrates main control unit 9 and controls adjustable exchange radiating circuit 11,3 Larmor of transmitting coil frequency is passed through by emitting control switching circuit 12
The alternating current of rate excites Hydrogen Proton precession, stops excitation current, and Hydrogen Proton generates relaxation phenomena under geomagnetic field action.
Receiver 6 includes：Amplifying circuit 14, A/D collecting units 15 and reception main control unit 16, wherein amplifying circuit 14
SQUID reading circuits 13 are connected, the electric signal exported to SQUID reading circuits 13 is amplified；A/D collecting units 14 connect institute
It states amplifying circuit 13 and digital signal is converted into amplified signal；It receives main control unit 15 and receives the A/D collecting units 14
Signal, with the wireless communication module carry out signal transmission, control the SQUID7 collecting magnetic resonance signals.Host computer 1
It is communicated by wireless communication module 4 and receiver 6, and SQUID7 is controlled to receive the magnetic resonance signal that Hydrogen Proton relaxation generates, led to
It crosses after amplifying circuit 13 amplifies to be acquired by A/D collecting units 14 and sent to and receives main control unit 15, synchronize and pass through wireless telecommunications
Module 4 is passed back to host computer 1 and stores.
Air-ground magnetic resonance detection device based on SQUID7 is a kind of high sensitivity, suitable for the efficient of complicated environmental condition
Hydrogeologic prospecting method, the course of work of the device control ground to send out by being laid with transmitting coil 3 on ground by host computer 1
Machine 2 is penetrated, 2 internal emission main control unit 9 of transmitter control adjustable DC radiating circuit 10 is logical by emitting control switching circuit 12
Enter 3 DC current of transmitting coil, generate pre-polarizing magnetic field, increase the Hydrogen Proton intensity of magnetization in body of groundwater, then turn off direct current
Electric current controls 2 internal emission main control unit 9 of transmitter to control adjustable exchange radiating circuit 11, is switched by emitting by host computer 1
Control circuit 12 is passed through the alternating current of 3 Larmor frequency of transmitting coil, excites Hydrogen Proton precession, stops excitation current, hydrogen matter
Son generates relaxation phenomena under geomagnetic field action, and host computer 1 is communicated by wireless communication module 4 and receiver 6, and is controlled
SQUID7 receives the magnetic resonance signal that Hydrogen Proton relaxation generates, and is converted into the magnetic signal received by SQUID reading circuits 13
After analog electrical signal, amplified by amplifying circuit 14, and acquired by A/D collecting units 15 and sent to and receive main control unit 16,
Synchronization is passed back to host computer 1 by wireless communication module 4 and stores.
The detection method of air-ground magnetic resonance detection device based on SQUID7, includes the following steps：
A, transmitting coil 3 is laid in detection target area, and according to actual measurement 3 size of situation and transmitting coil, determines survey line
8th, 5 speed of aircraft and flying height；
B, it connection and debugs transmitting and receives circuit, ensure the normal communication of host computer 1 and transmitter 2, receiver 6, fly
Row device 5 drives into survey line 8；
C, host computer 1 controls the transmitting main control unit 9 inside transmitter 2, connection adjustable DC radiating circuit 10, and passes through
Transmitting control switching circuit 12 is passed through 3 Constant Direct Current electric current of transmitting coil, and adiabatic method cut-off current is used after emitting 8s；
D, after DC current shutdown, host computer 1 controls the transmitting main control unit 9 inside transmitter 2, connects adjustable exchange hair
Transmit-receive radio road 11, and pass through and emit the Larmor frequency alternating current that control switching circuit 12 is passed through 3 certain amplitude of transmitting coil, it sends out
Penetrate cut-off current after 40ms；
E, alternating current shutdown moment, aircraft 5 keeps constant height and speed is flown along survey line 8, and host computer 1 passes through nothing
The reception main control unit 15 that line communication module 4 is controlled and received inside machine 6 starts to acquire signal；
F, after the magnetic resonance signal of SQUID7 acquisitions is converted into analog electrical signal by SQUID reading circuits 13, by amplification
Circuit 14 amplifies, and collects data by A/D collecting units 15 and receives main control unit 16；
G, it receives main control unit 16 and host computer 1 is passed data to by wireless communication module 4；
H, c-g steps are repeated for several times, it is ensured that the reliability of measurement result；
I, DC current remains unchanged, and changes alternating current size according to 3 size of transmitting coil, the number of turn and detection target,
C-h processes are repeated, complete the measurement of different pulse squares.
Embodiment
Air-ground magnetic resonance detection device and detection method based on SQUID7, include the following steps in the present embodiment：
A, the annular emission coil 3 of diameter 200m is laid in detection target area, determines according to actual conditions survey line 8, flown
5 speed of row device is 20m/s, flying height 10m；
B, it connection and debugs transmitting and receives circuit, ensure the normal communication of host computer 1 and transmitter 2, receiver 6, fly
Row device 5 drives into survey line 8；
C, host computer 1 controls the transmitting main control unit 9 inside transmitter 2, connection adjustable DC radiating circuit 10, and passes through
Transmitting control switching circuit 12 is passed through transmitting coil 3120A Constant Direct Current electric currents, and adiabatic method cut-off current is used after emitting 8s；
D, after DC current shutdown, host computer 1 controls the transmitting main control unit 9 inside transmitter 2, connects adjustable exchange hair
Transmit-receive radio road 11, and pass through emit control switching circuit 12 be passed through 3 amplitude of transmitting coil be 50A Larmor frequency alternating current,
Cut-off current after transmitting 40ms；
E, alternating current shutdown moment, the keep at a distance speed of ground 10m and 20m/s of aircraft 5 are flown along survey line 8, on
The reception main control unit 15 that position machine 1 is controlled and received by wireless communication module 4 inside machine starts to acquire signal；
F, after the magnetic resonance signal of SQUID7 acquisitions is converted into analog electrical signal by SQUID reading circuits 13, by amplification
Circuit 14 amplifies, and collects data by A/D collecting units 15 and receives main control unit 16；
G, it receives main control unit 16 and host computer 1 is passed data to by wireless communication module 4；
H, c-g step 10 is repeated six times, it is ensured that the reliability of measurement result；
I, DC current remains unchanged, and changes alternating current size, repeats c-h processes ten times, completes different pulse squares
It measures.
The above description is merely a specific embodiment, when cannot limit the range implemented of the present invention with this, it is all according to
The equivalent variations and modification that the present invention is made, should all belong to the scope of protection of the present invention.
Claims (8)
1. the air-ground magnetic resonance detection device based on SQUID, which is characterized in that including：
Transmitter connects transmitting coil by a transmitting control switching circuit, and being passed through DC current to transmitting coil generates pre- pole
Magnetizing field increases the Hydrogen Proton intensity of magnetization and shutdown DC current in body of groundwater and is passed through Larmor frequency to transmitting coil
Alternating current excitation Hydrogen Proton movement, stop excitation current, Hydrogen Proton generates relaxation phenomena under geomagnetic field action；
SQUID receives the magnetic resonance signal that Hydrogen Proton relaxation generates, and connects SQUID reading circuits, and the magnetic of SQUID acquisitions is believed
Number it is converted into electric signal；
Receiver is mounted on an aircraft, is connect with the SQUID reading circuits；
Connection is communicated between host computer, with the receiver and transmitter, sends out control signal, the transmitter is controlled to hand over straight
The switching and shutdown of current emission are flowed, controls acquisition of the receiver to signal.
2. detection device according to claim 1, which is characterized in that the transmitter includes：
Adjustable DC radiating circuit, connects the transmitting control switching circuit, and DC current is provided for the transmitting coil；
Adjustable exchange radiating circuit, connects the transmitting control switching circuit, and alternating current is provided for the transmitting coil；
Emit main control unit, the control signal of the host computer is received, to the adjustable DC radiating circuit and adjustable exchange
Radiating circuit is controlled.
3. detection device according to claim 1, which is characterized in that the receiver includes：
Amplifying circuit is connect with the SQUID reading circuits, and the electric signal of SQUID reading circuits output is amplified；
A/D collecting units connect the amplifying circuit and are converted into digital signal to amplified signal；
Main control unit is received, the signal of the A/D collecting units is received, by carrying out letter between wireless communication module and host computer
Number transmission, control the SQUID collecting magnetic resonance signals.
4. detection device according to claim 1, which is characterized in that the aircraft flies at a constant speed along survey line, the survey line
It is closed with topographic features to be measured and transmitting coil matching size.
5. the detection method of the air-ground magnetic resonance detection device based on SQUID, which is characterized in that
Control the switching and shutdown of the transmitter ac and dc current transmitting；
Transmitting coil is connected by a transmitting control switching circuit, being passed through DC current to transmitting coil generates pre-polarizing magnetic field,
The Hydrogen Proton intensity of magnetization and shutdown DC current are passed through the alternating current of Larmor frequency to transmitting coil in increase body of groundwater
Stream excitation Hydrogen Proton movement, stops excitation current, Hydrogen Proton generates relaxation phenomena under geomagnetic field action；
The magnetic resonance signal of Hydrogen Proton relaxation generation is received by superconductive quantum interference mode, the magnetic signal of receiving is converted into electricity
Signal；
Acquisition electric signal is received, signal is handled, is wirelessly transmitted in host computer and is stored.
6. detection method according to claim 5, which is characterized in that the control transmitter ac and dc current transmitting
Switching and turn off process：
Adjustable DC radiating circuit is controlled to provide transmitting coil DC current, keeps cut-off current after a period of time；
Adjustable exchange radiating circuit is controlled to provide transmitting coil alternating current, keeps cut-off current after a period of time.
7. detection method according to claim 5, which is characterized in that include the following steps：
A, transmitting coil is laid in detection target area, and according to actual measurement situation and transmitting coil size, determines survey line, aircraft
Speed and flying height；
B, it connection and debugs transmitting and receives circuit, ensure the normal communication of host computer and transmitter, receiver, aircraft drives into
Survey line；
C, the transmitting main control unit inside PC control transmitter connects adjustable DC radiating circuit, and passes through transmitting switching
Control circuit is passed through transmitting coil Constant Direct Current electric current, keeps cut-off current after a period of time；
D, after DC current shutdown, the transmitting main control unit inside PC control transmitter connects adjustable exchange radiating circuit,
And pass through and emit the Larmor frequency alternating current that control switching circuit is passed through transmitting coil certain amplitude, after being kept for a period of time
Shutdown；
E, alternating current shutdown moment, aircraft keeps constant height and speed is flown along survey line, and host computer passes through communication module
The reception main control unit inside machine is controlled and received to start to acquire signal；
F, the magnetic resonance signal of SQUID acquisitions amplifies by amplifying circuit, and data are collected reception master by A/D collecting units
Control unit；
G, it receives main control unit and host computer is passed data to by communication module.
8. detection method according to claim 6, which is characterized in that it is constant to be passed through transmitting coil for direct current in the step c
DC current is constant, changes alternating current size according to transmitting coil size, the number of turn and detection target, repeats c-g processes, complete
The measurement of different pulse squares.
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| WO2022000566A1 (en) * | 2020-06-29 | 2022-01-06 | 山东大学 | Novel tracing method and device based on electromagnetic field |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109814161A (en) * | 2019-02-20 | 2019-05-28 | 吉林大学 | A kind of magnetic air resonance underground water detection device and method |
| WO2022000566A1 (en) * | 2020-06-29 | 2022-01-06 | 山东大学 | Novel tracing method and device based on electromagnetic field |
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