CN106154341B - A kind of nuclear magnetic resonance and transient electromagnetic integrative detection instrument and working method - Google Patents
A kind of nuclear magnetic resonance and transient electromagnetic integrative detection instrument and working method Download PDFInfo
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- CN106154341B CN106154341B CN201610451149.0A CN201610451149A CN106154341B CN 106154341 B CN106154341 B CN 106154341B CN 201610451149 A CN201610451149 A CN 201610451149A CN 106154341 B CN106154341 B CN 106154341B
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- 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
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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 invention discloses a kind of nuclear magnetic resonance and transient electromagnetic integrative detection instrument, including host, transmitting coil, receiving transducer and master system, host includes the transmitting module for exporting nuclear magnetic resonance excitation pulse and transient electromagnetic excitation pulse, the receiving module of nuclear magnetic resonance and two kinds of response signals of transient electromagnetic is acquired, realizes the communication module of the instruction and data interaction between master system and host computer control module；Transmitting module provides pulse output to transmitting coil, and the signal that receiving module acquire receiving transducer carries out pre-filtering enhanced processing, and general's treated signal transmission is to control module.The present invention abandons traditional single frequency sinusoidal wave mode of excitation in terms of the transmitting of nuclear magnetic resonance excitation pulse, to eliminate bulky resonance circuit, is conducive to carry out the work in the tunnel of execution conditions complexity.The present invention carries the coil brace of multiple probes while design, have the advantages that the observation requirements that can meet Multi probe array while receive.
Description
Technical field
The present invention relates to a kind of nuclear magnetic resonance and transient electromagnetic integrative detection instrument and working method.
Background technology
Implement to dispose with further with the proposition of the Belt and Road strategy, China will be in railway and highway communication, water
Sharp water power, energy mine, municipal works and other field build a large amount of Tunnel Engineering.With multiple in landform and geological conditions
The profound Tunnel Engineering built in miscellaneous mountain area and karst area emerges in multitude, and the prominent mud disaster of the gushing water in tunnel is shown
The characteristics of " great burying, strong karst, high hydraulic pressure, big flow ".In tunnel gushing water dashes forward mud advanced prediction how directly, it is accurate and
Quantitatively water and the preservation information of identification tunnel tunnel face front hazard geological body the controls such as block for follow-up slip casting
There is important directive significance.Wherein, directly the water problem at quantitative forecast front of tunnel heading disaster water source is tunnel gushing water
The problem of urgent need to resolve in prominent mud advanced prediction.
Currently, detection and the solution of Comprehensive Geophysics are made an on-the-spot survey and utilized in conjunction with Advance Drilling, face mapping, earth's surface
The method of releasing has become the universal thinking of the prominent mud advanced prediction of tunnel gushing water.In numerous prospecting geophysical methods, nuclear magnetic resonance
Detection is uniquely can directly to determine the geophysics side of the information such as the spatial distribution, water content and formation porosity of water content
Method.Nuclear magnetic resonance detection Hydrogen Proton resonance identical frequency (Larmor frequency) into underground transmitting and water using earth-free loop line
Radio frequency electromagnetic excite and obtain underground water NMR response signal.It is carried out using nuclear magnetic resonance Detection Techniques in tunnel
The moisture content of country rock and porosity information in front of tunnel heading a certain range can be directly obtained by directly visiting water, to realize to the palm
The qualitative recognition of the prominent mud disaster source of gushing water and quantitative forecast in face of son.In addition to nuclear magnetic resonance detects, type electromagnetic induction is belonged to it
The transient electromagnetic method of electromagnetic method also can be by earth-free loop line to front of tunnel heading pulsed emission current；According to two received
Secondary field evanescent voltage determines the spatial shape of the Electrical distribution structure and underground good conductor of underground medium.It is anti-due to nuclear magnetic resonance
Drill has dependence with data interpretation for underground electrical structure distributed intelligence, and in recent years, it is reasonable to be obtained using transient electromagnetic method
Electrical Models and guide the joint interpretation technology of nuclear magnetic resonance inverting to obtain extensive concern.Both comprehensive characteristic and advantage,
Development nuclear magnetic resonance combines the research of interpretation technique with transient electromagnetic in tunnel and application is the prominent mud disaster of solution tunnel gushing water
Advanced prediction provides effective way.
Currently, lacking special connection in tunnel gushing water dashes forward mud advanced prediction using Comprehensive Geophysics joint interpretation technology
Use apparatus.Nuclear magnetic resonance detect with the joint interpretation technology of transient electromagnetic method need to use respectively two different instruments into
The observation and acquisition of row data.Specifically, it has the following problems：
First, transmitted waveform type is different.Nuclear magnetic resonance detection excitation pulse used is single frequency sinusoidal pulse, belongs to frequency
Domain waveform.Transmitting pulse used in transient electromagnetic method has bipolarity rectangular wave, bi-polar half sine wave and bipolarity trapezoidal wave
Etc. time domain waveforms.The transmitting for completing the excitation pulse of two methods needs two sets of transmitting modules or device.
Second, receiving side signal formula is different.Nuclear magnetic resonance detection belongs to frequency domain induced electricity magnetic method, theoretic response signal
For the electromagnetic attenuation signal of single-frequency.Locking amplifying technique orthogonal with conditioning generally use for the reception of single-frequency deamplification, core
Magnetic Resonance entrainment of the broadband electromagnetic noise in space by orthogonal locking amplification after be a narrow band signal.Transition
Electromagnetic method belongs to time domain induced electricity magnetic method, and the evanescent voltage signal of the secondary field received has abundant harmonic component.To this
The reception of the broadband electromagnetic signal of sample and the bandpass filtering of the conditioning certain passband of generally use simultaneously carry out multiple stacking, and cannot
Use orthogonal lock-up amplifier circuit.
Third, based on traditional core magnetic resonance detection and the transmitting of the waveform of transient electromagnetic method and response reception mode, combined instrument
Device device will use distributed realization method.Built-in two discrete modules are each during realization, in one set of instrument thinks highly of oneself
The transmitting and reception of nuclear magnetic resonance and transient electromagnetic are blamed, instrument system is complicated.
Fourth, since traditional nuclear magnetic resonance uses the NMR response of single frequency sinusoidal pulse excitation underground water content, instrument
Device transmitter needs bulky resonant capacitance module；To which equipment instrument is greatly increased with weight, it is unfavorable in construction ring
The development of the prominent mud advanced prediction work of gushing water in the tunnel of border complexity.
In conclusion in order to overcome the deficiencies of the prior art, invents and a kind of dashed forward mud advanced prediction applied to tunnel gushing water
Nuclear magnetic resonance and transient electromagnetic integrative detection instrument.Two methods of nuclear magnetic resonance and transient electromagnetic are realized by set of device
Excitation pulse transmitting and response signal reception.So as to combine with transient electromagnetic for nuclear magnetic resonance explain provide it is new
Hardware supported preferably solves the quantitative judge and forecasting problem at the prominent mud disaster water source of gushing water.
Invention content
The present invention is to solve the above-mentioned problems, it is proposed that a kind of nuclear magnetic resonance and transient electromagnetic integrative detection instrument and work
Make method, the present invention is used to carry out in construction tunnel the prominent mud advanced prediction of gushing water, can realize nuclear magnetic resonance by set of device
With two methods of the excitation pulse transmitting of transient electromagnetic and the reception of response signal.
To achieve the goals above, the present invention adopts the following technical scheme that：
A kind of nuclear magnetic resonance and transient electromagnetic integrative detection instrument, including host, transmitting coil, receiving transducer and on
Position machine system, host include the transmitting module for exporting nuclear magnetic resonance excitation pulse and transient electromagnetic excitation pulse, and acquisition nuclear-magnetism is total
The receiving module to shake with two kinds of response signals of transient electromagnetic realizes the instruction between master system and host computer control module and number
According to interactive communication module, control receiver module, the control module of transmitting module and communication module, and the power supply that is powered
Module；
The transmitting module provides pulse output to transmitting coil, the signal that the receiving module acquires receiving transducer into
Row pre-filtering enhanced processing, and signal transmission is excited to control module, realization nuclear magnetic resonance and transient electromagnetic by treated
The transmitting of pulse and the reception of response signal.
The transmitting coil includes coil brace and transmitting conducting wire, and transmitting coil, transmitting module are provided on coil brace
Receive the firing order of host computer, the transmitting transient electromagnetic excitation pulse of control transmitting coil and nuclear magnetic resonance excitation pulse.
The coil brace exterior contour is square, and internal stent is rice font structure, and nine use are provided on holder
In the probe mounting hole of fixed reception probe, probe mounting hole is evenly distributed on meter font structure holder, can carry out visit more
Head array formula receives.
The nuclear magnetic resonance excitation pulse emitted is the bipolarity cycle square wave pulse under Larmor frequency；The wink emitted
It is the adjustable bipolarity Square wave pulses of duty ratio to become electromagnetism excitation pulse.
The radiating circuit includes bridge-type IGBT radiating circuits, and each IGBT reversal connections are parallel with diode.
It is provided with sectionalizing joint on the transmitting conducting wire, the number of turns that the length transmitting coil of conducting wire is emitted by change carries out
It is adjusted flexibly.
The control module of the host includes host MCU, clock circuit and self-checking circuit, wherein the clock circuit
The clock frequency needed for work is provided for host MCU, self-checking circuit realizes the startup self-detection of system, and the result of self-test is uploaded
To host computer.
A kind of working method based on above-mentioned instrument, includes the following steps：
(1) NMR response in square wave nuclear magnetic resonance excitation pulse excitation water is used：According to the earth's magnetic field magnetic of measurement
Induction calculates exomonental tranmitting frequency, excites the nuclear magnetic resonance in water to ring using square wave nuclear magnetic resonance excitation pulse
It answers, conducting and pass of the trigger circuit in transmitting module according to the IGBT in received transmitting sequence control transmitting bridge
It is disconnected；
(2) the prominent mud NMR response signal acquisition of tunnel gushing water and extraction：To reception in control module after pulse-off
Module and receiving transducer send signal acquisition order, are tentatively filtered to the NMR response signal acquired, acquisition letter
The analog to digital conversion circuit for number being input to receiving module completes the digitlization of signal；
(3) the prominent mud Transient electromagnetic response signal acquisition of tunnel gushing water and extraction：Transient electromagnetic hair is adjustable using duty ratio
Bipolarity Square wave pulses excite, and after the shutdown of excitation pulse forward or backwards, control module is sent out to receiving module and receiving transducer
The number of delivering letters acquisition is filtered the NMR response signal acquired, is handled.
In the step (1), tranmitting frequency be Larmor frequency bipolarity cycle square wave pulse to tunnel face in face of
Hydrogen Proton in Fang Shuiti carries out nuclear magnetic resonance excitation.
In the step (1), control module generates a transmitting sequence according to the tranmitting frequency calculated and is sent to
To transmitting module, trigger circuit the leading according to the IGBT in received transmitting sequence control transmitting bridge in transmitting module
Logical and shutdown.
In the step (1), square-wave pulse frequency is to survey the Larmor frequency of Hydrogen Proton in water in area, and pulse mode is double
Polar cycle square wave pulse, there is only fundametal compoments and odd harmonic component for the frequency spectrum of pulse.
In the step (2), control module is filtered signal the NMR response signal for extracting narrowband
Envelope signal, response signal is uploaded to master system by communication module and stores and record.
Beneficial effects of the present invention are：
(1) present invention abandons traditional single frequency sinusoidal wave mode of excitation in design, bulky to eliminate
Resonance circuit, the square wave nuclear magnetic resonance excitation pulse emitted pass through a set of hair with the adjustable bipolarity Square wave pulses of duty ratio
It is emitted back towards road realization, improves emission effciency；
(2) present invention small, control using the launching circuit of high-power ambipolar thyristor and associated trigger circuit composition
Precision processed is high and electric insulation is easy to implement.Transmitting module design scheme proposed by the invention can effectively mitigate transmitting mould
Block weight reduces transmitting module volume, is conducive to carry out the work in the tunnel of execution conditions complexity；
(3) present invention employs the Signal acquiring and processing mode of total digitalization, nuclear magnetic resonance and two kinds of sound of transient electromagnetic
Induction signal will pass through analog-to-digital conversion after the pre-filtering amplification of probe and change into digital signal, quilt after response signal digitlization
Digital filter program processing in special signal processing chip, this digital processing mode have precision high, anti-interference
The advantages of ability is strong and can be controlled by program；
(4) present invention also reduces hardware purchase cost and letter by digital filter instead of conventional hardware filter circuit
The volume of number receiving module；
(5) present invention devises a kind of coil brace that can carry multiple probes simultaneously, can meet Multi probe array
The observation requirements received simultaneously, improve observed efficiency；In addition, the working method that Multi probe array receives simultaneously avoids repeatedly
The case where when error under launching condition when difference receives between transmitted waveform, more composite theory are simulated, coil brace makes
It is formed with acetal plastic thermoplastic, it is sturdy and durable and can be disassembled and construction easy to assembly.
Description of the drawings
Fig. 1 is the system block diagram of the present invention；
Fig. 2 is the transmitting coil rack assumption diagram of the present invention；
Fig. 3 is the operation principle schematic diagram of the present invention.
Wherein, 1, A type support connectors, 2, Type B support connector, 3, C-shaped support connector, 4, probe mounting hole, 5,
Fixing bolt, 6, rice font cradling piece, 7, outside support bar.
Specific implementation mode：
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
The nuclear magnetic resonance and transient electromagnetic integrative detection instrument of mud advanced prediction as shown in Figure 1, a kind of tunnel gushing water is dashed forward
It is made of host, transmitting coil, emission power, a set of receiving transducer and master system.Host includes transmitting module, receives
Module, power module, control module and communication module.The control module of host is by host MCU, clock circuit and self-test electricity
Road forms.Host MCU selects high-performance embedded control chip, is responsible for control host modules and realizes corresponding function.When
Clock circuit provides the clock frequency needed for work for host MCU.The working frequency of entire host system is all finally by clock electricity
Road determines.Self-checking circuit realizes the startup self-detection of instrument, and the result of self-test is uploaded to master system.Host and host computer
Data between system and host modules are completed with command communication by communication bus.Each module of host point has as follows
Function：
(1) transmitting module realizes the transmitting of nuclear magnetic resonance and two kinds of excitation pulses of transient electromagnetic in tunnel.It is total as nuclear-magnetism
The nucleus module to shake with transient electromagnetic integrative detection instrument, transmitting module realize nuclear magnetic resonance and wink using a set of launching circuit
Become the transmitting of electromagnetism two methods excitation pulse.The nuclear magnetic resonance excitation pulse emitted is the bipolarity week under Larmor frequency
Phase square-wave pulse.The transient electromagnetic excitation pulse emitted is the adjustable bipolarity Square wave pulses of duty ratio.It is described to be transmitted back to
The core on road is the bridge circuit and associated trigger control circuit that high-power insulated gate bipolar thyristor (IGBT) is constituted.Hair
The conducting and shutdown for penetrating the IGBT that module receives in the firing order control transmitting bridge from host computer, realize excitation pulse
Transmitting.
(2) receiving module, built-in signal processing chip realize nuclear magnetic resonance and two kinds of response signals of transient electromagnetic in tunnel
Reception.As the nucleus module of nuclear magnetic resonance and transient electromagnetic integrative detection instrument, receiving module passes through total digitalization
Signal receives the reception that nuclear magnetic resonance and transient electromagnetic two methods response signal are realized with processing mode.Response signal is by connecing
The receiving module of probe input host is received, the pre-filtering amplification of receiving transducer carries out preliminary treatment to response signal.Signal is defeated
It is further processed by analog-to-digital conversion input signal processing chip after entering receiving module.Signal processing chip passes through program-controlled number
Word filter handles finally the response signal of nuclear magnetic resonance and transient electromagnetic respectively, and by treated, signal data uploads
To master system.
(3) power module provides reliable working power for host.
(4) control module, each module of control host realize response function.
(5) communication module realizes the instruction and data interaction of host and master system.
At work, nuclear magnetic resonance shares a set of transmitting and receiving device with two methods of transient electromagnetic.Specifically include with
Lower function：
(1) NMR response in square wave nuclear magnetic resonance excitation pulse excitation water is used.Gushing water prominent mud in tunnel is pre- in advance
The nuclear magnetic resonance of report and the bipolarity cycle square wave pulse that transient electromagnetic integrative detection instrument tranmitting frequency is Larmor frequency
Nuclear magnetic resonance excitation is carried out to the Hydrogen Proton in tunnel tunnel face front water body.Host MCU is according to the earth's magnetic field magnetic induction of measurement
The exomonental tranmitting frequency f of Strength co-mputationt, 2 π × ft=ω t=γpB0.According to the tranmitting frequency host MCU lifes calculated
At a transmitting sequence and send it to the transmitting module of host.Trigger circuit in transmitting module is according to received hair
Penetrate the conducting and shutdown of the IGBT in sequence control transmitting bridge.The pulse that host transmitting module is emitted is square wave nuclear magnetic resonance
Excitation pulse.Square-wave pulse frequency (fundamental frequency) ftIt is the Larmor frequency for surveying Hydrogen Proton in water in area, pulse mode is bipolarity
Cycle square wave pulse.There is only fundametal compoments and odd harmonic component for the frequency spectrum of pulse.Fundametal compoment can be in front of tunnel
The Hydrogen Proton of the prominent mud disaster weight of gushing water carries out nuclear magnetic resonance excitation and receives NMR response after square-wave pulse shutdown
Signal.
(2) the prominent mud NMR response signal acquisition of full digital tunnel gushing water and extraction.Pulse-off aft engine MCU to
Receiving module and receiving transducer send signal acquisition order.Preposition band logical active power filtering amplifier, energy are provided in receiving transducer
It is enough that the NMR response signal acquired is tentatively filtered.Acquisition signal is input to the analog to digital conversion circuit of receiving module
Complete the digitlization of signal.Analog to digital conversion circuit uploads to signal in the dsp chip in receiving module later.Digitized sound
After induction signal inputs DSP, the digital quadrature locking amplification procedure woven in DSP is filtered signal as digital filter
Processing extracts the envelope signal of the NMR response signal of narrowband.Response signal is uploaded to upper by communication module later
Machine system is stored and is recorded.In the receive process of entire response signal, signal is by preposition amplification and owning after analog-to-digital conversion
Signal processing is realized by digital filter algorithm in dsp chip.
(3) the prominent mud Transient electromagnetic response signal acquisition of full digital tunnel gushing water and extraction.Transient electromagnetic hair uses duty
It is excited than adjustable bipolarity Square wave pulses.After the shutdown of excitation pulse forward or backwards, host MCU is to receiving module and reception
Probe sends signal acquisition order.Preposition band logical active power filtering amplifier is provided in receiving transducer, it can be to the core that is acquired
Magnetic Resonance is tentatively filtered.Acquisition signal is input to the number of the analog to digital conversion circuit completion signal of receiving module
Change.Analog to digital conversion circuit uploads to signal in the dsp chip in receiving module later.Digital band pass filtering in dsp chip
Circuit does bandpass filtering treatment to digitized signal, and the response signal after processing later is uploaded to by communication module
Position machine system is stored and is recorded.In the receive process of entire response signal, signal is by preposition amplification and the institute after analog-to-digital conversion
Signal processing is realized by digital filter algorithm in dsp chip.
In conjunction with attached drawing 3 to the nuclear magnetic resonance and transient electromagnetic integrative detection instrument of a kind of prominent mud advanced prediction of tunnel gushing water
Operation principle do following elaboration.
Integrative detection instrument booting aft engine, which opens self-checking function and self-detection result is uploaded to master system, to be shown.
If self-test does not pass through, master system then will produce alarm and interrupt all appts operation, and operator debugs and self-test is logical
Later integrative detection instrument just enters normal operating conditions.Nuclear magnetic resonance is selected by upper computer software first when start-up operation
Or Transient electromagnetic measure method.The operation principle of two kinds of measurement methods of nuclear magnetic resonance and transient electromagnetic is distinguished separately below
It illustrates：
(1) nuclear magnetic resonance measuring method, integrative detection instrument is selected to enter high-frequency work pattern.It is surveyed first by instrument
Amount current Earth magnetic field parameter simultaneously demarcates transmitting coil axial direction and direct north.Measured earth magnetic field parameter includes：Earth magnetism
Field magnetic induction intensity, earth magnetism geomagnetic inclination and geomagnetic declination.Host MCU calculates transmitting according to the earth's magnetic field magnetic induction intensity of measurement
The tranmitting frequency f of pulset, 2 π × ft=ω t=γpB0.A transmitting sequence is generated according to the tranmitting frequency host MCU calculated
Arrange and send it to the transmitting module of host.Trigger circuit in transmitting module controls hair according to received transmitting sequence
Penetrate the conducting and shutdown of the IGBT in bridge.It is the calculated tranmitting frequency f of institute that IGBT, which is connected with the frequency of shutdown,t.Emit mould
The power supply of block is from the emission power for being connected to external power supply.
The ambipolar cycle square wave pulse for the pulsed odd function that transmitting module is emitted.According to the reason of frequency analysis
By bipolarity cycle square wave pulse contains DC component, fundamental wave and higher harmonic components, when block- pulse function is odd function
When, the frequency spectrum of pulse is tranmitting frequency f there is only fundametal compoment and odd harmonic component and fundamental frequencyt.Due to fundamental frequency
It is equal with the Larmor frequency of Hydrogen Proton in water, therefore nuclear magnetic resonance excitation can be carried out to it and be followed by square-wave pulse shutdown
Receive NMR response signal.Q in Fig. 31~Q4Four IGBT pipes are located on four bridge arms of bridge circuit, D1~D4
It is fly-wheel diode, ZLIndicate the impedance of excitation variable winding.
During impulse ejection, when square-wave pulse is positive, Q1With Q4Two pipe conductings；When square-wave pulse is negative sense
When, Q2With Q3Two IGBT conductings.To prevent power supply short circuit, the negater circuit in transmitting module ensures on the bridge arm of the same side two
Two pipes will not simultaneously turn on.During square-wave pulse commutates, sustained diode1~D4Electric current in proof load
Continuation mode caused by inductive load current is mutated overvoltage by device breakdown.D5And D6What two anti-paralleled diodes formed
Clamp circuit is automatically shut down when load terminal voltage is less than its conduction voltage drop, and output end voltage is clamped to zero；Ensure transmitting electricity
Stream pulse rapidly switches off.The excitation pulse duration is controlled according to required investigation depth.
Pulse-off aft engine MCU sends signal acquisition order to receiving module and receiving transducer.It is arranged in receiving transducer
There is preposition band logical active power filtering amplifier, the NMR response signal acquired can tentatively be filtered.Acquire signal
The analog to digital conversion circuit for being input to receiving module completes the digitlization of signal.Signal is uploaded to reception by analog to digital conversion circuit later
In mould dsp chip in the block.Dsp chip is the special signal processor in receiving module, his strong point is that a large amount of processing are floating
The operation of points, is very suitable for signal processing.After digitized response signal input DSP, the digital quadrature woven in DSP is locked
Determine the envelope that amplification procedure is filtered signal as digital filter the NMR response signal for extracting narrowband
Signal.Response signal is uploaded to master system by communication module and stores and record later.According to set in firing order
Stacking fold carry out multi collect and be superimposed be finally completed the excitation of nuclear magnetic resonance and the acquisition of response signal.
(2) Transient electromagnetic measure method, integrative detection instrument is selected to enter low frequency operating mode.Pass through upper computer software
Set the emission parameters such as frequency, duty ratio, stacking fold, the emission current for the Square wave pulses to be emitted.Emission parameter is set
Host is sent to by serial communication after setting.
The communication module of host receives emission parameter and sends it to host MCU.Host MCU generates transmitting sequence and will
It is sent to the transmitting module of host.Trigger circuit in transmitting module controls transmitting bridge according to received transmitting sequence
In IGBT conducting and shutdown.
When bipolarity Square wave pulses are positive, Q1With Q4Two pipe conductings；When bipolarity Square wave pulses are negative sense
When, Q2With Q3Two IGBT conductings.It is different from nuclear magnetic resonance working method, after positive or direction excitation pulse shutdown, host
MCU sends signal acquisition order to receiving module and receiving transducer.Preposition band logical active power filtering amplification is provided in receiving transducer
Device can tentatively filter the NMR response signal acquired.The modulus that acquisition signal is input to receiving module turns
Change the digitlization that circuit completes signal.
Analog to digital conversion circuit uploads to signal in the dsp chip in receiving module later.Digital band pass in dsp chip
Filter circuit does bandpass filtering treatment to digitized signal, and the response signal after processing later is uploaded by communication module
It stores and records to master system.Multi collect is carried out according to stacking fold set in firing order and is superimposed final complete
At the excitation of nuclear magnetic resonance and the acquisition of response signal.
A kind of transmitting coil of the nuclear magnetic resonance and transient electromagnetic integrative detection instrument of the prominent mud advanced prediction of tunnel gushing water
Holder is as shown in Figure 2.Entire transmitting coil bracket outer profile is square, and mid-stent is at rice font structure, nine probes
Mounting hole 4 is evenly distributed on meter font holder.Coil brace cradling piece and connector group made of acetal plastic thermoplastic
It fills.
Coil brace bar has small-sized and large-scale two kinds of specifications.
The center spacing of a length of 600cm in outside after small coil bracket assembled, each mounting hole 4 of popping one's head in are 150cm, probe
4 diameter adjustment of mounting hole ranging from 10~20cm.Bracket outer profile is by the cradling piece that 8 length of sides are 290cm, a diameter of 5cm
Assemble.Cradling piece both sides are useful for the screw thread being connected and fixed, and length is 5cm shared by screw thread.Rice font internal stent bar 8 by
Eight root longs are 420cm, and the cradling piece of a diameter of 5cm assembles.There are one probes for the middle part design of every rice font holder
Mounting hole 4, mounting hole each side there are one fixing bolt 5.The straight of mounting hole can be adjusted by turn fixing bolt 5
Diameter is fixed on to receive probe in probe mounting hole 4.The inside of probe mounting hole 4 is provided with the coated foam-rubber cushion of rubber skin
With the flexibility for increasing friction and adjusting.Cradling piece both sides are useful for the screw thread being connected and fixed, and length is 4cm shared by screw thread.
The center spacing of a length of 1200cm in outside after massive coil bracket assembled, probe mounting hole 4 are 300cm, probe
4 diameter adjustment of mounting hole ranging from 10~20cm.Bracket outer profile is by the cradling piece that 8 length of sides are 590cm, a diameter of 5cm
Assemble.Cradling piece both sides are useful for the screw thread being connected and fixed, and length is 5cm shared by screw thread.8 root long of rice font internal stent
Cradling piece for 840cm, a diameter of 5cm assembles.There are one mounting holes of popping one's head in for the middle part design of every rice font holder
4, mounting hole each side there are one fixing bolt 5.By turn fixing bolt 5 can adjust the diameter of mounting hole to
It will receive probe to be fixed in probe mounting hole 4.The inside of probe mounting hole 4 is provided with the coated foam-rubber cushion of rubber skin and is rubbed with increasing
The flexibility wiped and adjusted.Cradling piece both sides are useful for the screw thread being connected and fixed, and length is 5cm shared by screw thread.
The connector of coil brace bar has tri- kinds of structures of A, B, C.A types support connector 1 is for connecting square coil branch
Four vertex of frame, Type B is with C-shaped support connector 3 for connecting rice font holder.It is carved with screw thread in connector and facilitates cradling piece
Assembling.Three connectors of A types support connector 1 are distributed at " pawl " shape, and connection cross section is square, length of side 8cm.B
Three "T"-shaped distributions of connector of type support connector 2, connector cross section are square, length of side 8cm.C-shaped support connects
Connector 3 not only as the connection of cradling piece but also centered on the mounting hole popped one's head in.There are two be used for fixed reception for both sides on connector
The fixing bolt 5 of probe, the diameter for adjusting center probe mounting hole 4.The inside of probe mounting hole 4 is provided with rubber suitcase
The foam-rubber cushion of quilt is to increase the flexibility of friction and adjusting.
When carrying out advanced prediction using nuclear magnetic resonance detection or transient electromagnetic method, there are central point reception and array reception
Two ways is available.It is according to Fig. 2 that transmitting coil bracket assembled is good before being detected.The work received using central point
When making mode, probe is fixed on center probe mounting hole 4 and starts to detect.Using array reception working method when, will
Receiving transducer array, which is fixed on corresponding probe mounting hole 4, to be started to detect.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (6)
1. a kind of nuclear magnetic resonance and transient electromagnetic integrative detection instrument, it is characterized in that：Including host, transmitting coil, receives and visit
Head and master system, host include the transmitting module for exporting nuclear magnetic resonance excitation pulse and transient electromagnetic excitation pulse, are adopted
Collect the receiving module of nuclear magnetic resonance and two kinds of response signals of transient electromagnetic, realizes between master system and host computer control module
The communication module of instruction and data interaction, control receiver module, the control module of transmitting module and communication module, and supplied
The power module of electricity；
The transmitting module provides pulse output to transmitting coil, before the receiving module carries out the signal that receiving transducer acquires
Set filter amplifying processing, and will treated signal transmission to control module, realize nuclear magnetic resonance and transient electromagnetic excitation pulse
Transmitting and response signal reception；
The coil brace exterior contour is square, and internal stent is rice font structure, and nine are provided on holder for solid
Determine the probe mounting hole of receiving transducer, probe mounting hole is evenly distributed on meter font structure holder, can carry out Multi probe battle array
Column receives；
The nuclear magnetic resonance excitation pulse emitted is the bipolarity cycle square wave pulse under Larmor frequency；The transient electrical emitted
Magnetic excitation pulse is the adjustable bipolarity Square wave pulses of duty ratio；
It is provided with sectionalizing joint on the transmitting conducting wire, the number of turns that the length transmitting coil of conducting wire is emitted by change carries out flexibly
Adjustment；
The control module of the host includes host MCU, clock circuit and self-checking circuit, wherein based on the clock circuit
Machine MCU provides the clock frequency needed for work, and self-checking circuit realizes the startup self-detection of system, and the result of self-test is uploaded to
Position machine.
2. a kind of nuclear magnetic resonance as described in claim 1 and transient electromagnetic integrative detection instrument, it is characterized in that：The transmitting
Coil includes coil brace and transmitting conducting wire, and transmitting coil is provided on coil brace, and transmitting module receives the transmitting of host computer
Order, the transmitting transient electromagnetic excitation pulse of control transmitting coil and nuclear magnetic resonance excitation pulse.
3. a kind of working method based on the instrument as described in any one of claim 1-2, it is characterized in that：Include the following steps：
(1) NMR response in square wave nuclear magnetic resonance excitation pulse excitation water is used：According to the earth's magnetic field magnetic induction of measurement
The exomonental tranmitting frequency of Strength co-mputation excites the NMR response in water, hair using square wave nuclear magnetic resonance excitation pulse
Penetrate conducting and shutdown of the mould trigger circuit in the block according to the IGBT in received transmitting sequence control transmitting bridge；
(2) the prominent mud NMR response signal acquisition of tunnel gushing water and extraction：To receiving module in control module after pulse-off
Signal acquisition order is sent with receiving transducer, the NMR response signal acquired is tentatively filtered, acquisition signal is defeated
Enter to the analog to digital conversion circuit of receiving module to complete the digitlization of signal；
(3) the prominent mud Transient electromagnetic response signal acquisition of tunnel gushing water and extraction：Transient electromagnetic hair is adjustable bipolar using duty ratio
Property Square wave pulses excitation, after the shutdown of excitation pulse forward or backwards, control module sends letter to receiving module and receiving transducer
Number acquisition, is filtered the NMR response signal acquired, is handled.
4. working method as claimed in claim 3, it is characterized in that：In the step (1), tranmitting frequency is Larmor frequency
The pulse of bipolarity cycle square wave carries out nuclear magnetic resonance excitation to the Hydrogen Proton in tunnel tunnel face front water body；
Control module generates a transmitting sequence according to the tranmitting frequency calculated and sends it to transmitting module, transmitting module
In trigger circuit according to the conducting and shutdown of the IGBT in received transmitting sequence control transmitting bridge.
5. working method as claimed in claim 3, it is characterized in that：In the step (1), square-wave pulse frequency is to survey area Nei Shui
The Larmor frequency of middle Hydrogen Proton, pulse mode are ambipolar cycle square wave pulses, and there is only fundametal compoments for the frequency spectrum of pulse
With odd harmonic component.
6. working method as claimed in claim 3, it is characterized in that：In the step (2), control module is filtered signal
Processing extracts the envelope signal of the NMR response signal of narrowband, and response signal is uploaded to host computer system by communication module
System is stored and is recorded.
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| CN111856601B (en) * | 2020-07-06 | 2023-03-14 | 吉林大学 | Distributed magnetic resonance underground water detection device and detection method |
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| CN113866837B (en) * | 2021-09-18 | 2023-12-19 | 吉林大学 | Electrical source nuclear magnetic resonance and induced polarization combined device and detection method |
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