CN106154341A - A kind of nuclear magnetic resonance, NMR and transient electromagnetic integrative detection instrument and method of work - Google Patents
A kind of nuclear magnetic resonance, NMR and transient electromagnetic integrative detection instrument and method of work Download PDFInfo
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- CN106154341A CN106154341A CN201610451149.0A CN201610451149A CN106154341A CN 106154341 A CN106154341 A CN 106154341A CN 201610451149 A CN201610451149 A CN 201610451149A CN 106154341 A CN106154341 A CN 106154341A
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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, NMR and transient electromagnetic integrative detection instrument, including main frame, transmitting coil, receiving transducer and master system, main frame includes exporting nuclear magnetic resonance, NMR excitation pulse and the transmitter module of transient electromagnetic excitation pulse, gather the receiver module of nuclear magnetic resonance, NMR and transient electromagnetic two kinds response signal, it is achieved the instruction between master system and host computer control module and the communication module of data interaction；Transmitter module provides pulse output to transmitting coil, and receiver module carries out pre-filtering processing and amplifying to the signal of receiving transducer collection, and the signal after processing is transferred to control module.The present invention abandons traditional single frequency sinusoidal ripple mode of excitation in terms of the transmitting of nuclear magnetic resonance, NMR excitation pulse, thus eliminates bulky resonance circuit, is conducive to carrying out the work in the tunnel of execution conditions complexity.Carry the coil brace of multiple probe while present invention design, there is the advantage that can meet the observation requirements that Multi probe array receives simultaneously.
Description
Technical field
The present invention relates to a kind of nuclear magnetic resonance, NMR and transient electromagnetic integrative detection instrument and method of work.
Background technology
Along with " one with a road " strategy proposition with further implement to dispose, China will be at railway and highway communication, water
Diuretic electricity, energy mine, municipal works and other field build substantial amounts of Tunnel Engineering.Along with multiple with geological conditions in landform
The profound Tunnel Engineering built in miscellaneous mountain area and karst area emerges in multitude, and the mud disaster of dashing forward of the gushing water in tunnel shows
The feature of " great burying, strong karst, high hydraulic pressure, big flow ".In tunnel gushing water dashes forward mud advanced prediction how directly, accurately and
Identify that the water yield of tunnel tunnel face front hazard geological body and tax deposit information for controls such as follow-up slip casting closure quantitatively
There is important directive significance.Wherein, directly the water yield problem at quantitative forecast front of tunnel heading disaster water source is tunnel gushing water
Prominent mud advanced prediction is needed badly a difficult problem for solution.
At present, make an on-the-spot survey in conjunction with Advance Drilling, face mapping, earth's surface and utilize detection and the solution of Comprehensive Geophysics
Method of releasing has become tunnel gushing water and has dashed forward the universal thinking of mud advanced prediction.In numerous prospecting geophysical methods, nuclear magnetic resonance, NMR
Detection is the geophysics side that uniquely can directly determine the information such as the spatial distribution of water content, water content and formation porosity
Method.Nuclear magnetic resonance, NMR detection utilizes earth-free loop line to launch to underground and Hydrogen Proton resonance same frequency (Larmor frequency) in water
Radio frequency electromagnetic excite and obtain subsoil water NMR response signal.Nuclear magnetic resonance, NMR Detection Techniques are applied to carry out in tunnel
Directly visit water and can directly obtain moisture content and the porosity information of country rock in front of tunnel heading certain limit, thus realize the palm
The qualitative recognition of sub-facial protrusion Shuitu mud disaster source and quantitative forecast.In addition to nuclear magnetic resonance, NMR detects, belong to type electromagnetic induction together with 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 Electrical distribution structure of underground medium and the spatial shape of underground good conductor.Anti-due to nuclear magnetic resonance, NMR
Drill and for underground electrical structure distributed intelligence, there is dependency with data interpretation, in recent years, utilize transient electromagnetic method to obtain rationally
Electrical Models and guides the joint interpretation technology of nuclear magnetic resonance, NMR inverting to obtain paying close attention to widely.Both characteristic and advantages comprehensive,
In tunnel, carry out nuclear magnetic resonance, NMR combine the research of interpretation technique and application with transient electromagnetic and dash forward mud disaster for solving tunnel gushing water
Advanced prediction provides effective way.
At present, application Comprehensive Geophysics joint interpretation technology lacks special connection in tunnel gushing water dashes forward mud advanced prediction
Use apparatus.Nuclear magnetic resonance, NMR detection needs to use two kinds of different instruments to enter respectively from the joint interpretation technology of transient electromagnetic method
The observation of row data and collection.Specifically, there is problems in that
One, transmitted waveform kind is different.Excitation pulse used by nuclear magnetic resonance, NMR detection is single frequency sinusoidal pulse, belongs to frequency
Domain waveform.Transmitting pulse used by transient electromagnetic method has bipolarity square wave, bi-polar half sine wave and bipolarity trapezoidal wave
Etc. time domain waveform.The transmitting of the excitation pulse completing two kinds of methods needs two set transmitter module or devices.
Its two, receiving side signal formula is different.Nuclear magnetic resonance, NMR detection belongs to frequency domain faradism magnetic method, theoretic response signal
Electromagnetic attenuation signal for single-frequency.Reception and the conditioning generally orthogonal locking amplifying technique of employing, core for single-frequency deamplification
Magnetic Resonance is a narrow band signal entrainment of the broadband electromagnetic noise in space after orthogonal locking is amplified.Transition
Electromagnetic method belongs to time domain faradism magnetic method, and the evanescent voltage signal of the secondary field received has abundant harmonic component.To this
Receiving of the broadband electromagnetic signal of sample generally uses the bandpass filtering of certain passband and carries out multiple stacking with conditioning, and can not
Use orthogonal lock-up amplifier circuit.
Its three, waveform based on traditional core magnetic resonance detection and transient electromagnetic method is launched and response reception mode, combined instrument
Device device to use distributed implementation.During realizing, in one set of instrument, built-in two discrete modules are each thinks highly of oneself
Blaming nuclear magnetic resonance, NMR and the transmitting of transient electromagnetic and reception, instrument system is complicated.
Its four, owing to traditional core magnetic resonance uses the NMR response of single frequency sinusoidal pulse excitation underground water content, instrument
Device transmitter needs bulky resonant capacitance module；Thus instrument volume is greatly increased with weight, it is unfavorable at construction ring
In the tunnel that border is complicated, gushing water is dashed forward the carrying out of mud advanced prediction work.
In sum, for overcoming the deficiencies in the prior art, invent a kind of tunnel gushing water that is applied to and dashed forward mud advanced prediction
Nuclear magnetic resonance, NMR and transient electromagnetic integrative detection instrument.Nuclear magnetic resonance, NMR and two kinds of methods of transient electromagnetic are achieved by set of device
Excitation pulse launch with response signal reception.Provide new it is thus possible to combine explanation with transient electromagnetic for nuclear magnetic resonance, NMR
Hardware supported, preferably solves gushing water and dashes forward the quantitative judge at mud disaster water source and forecasting problem.
Summary of the invention
The present invention is to solve the problems referred to above, it is proposed that a kind of nuclear magnetic resonance, NMR and transient electromagnetic integrative detection instrument and work
Making method, the present invention carries out gushing water in the construction tunnel and dashes forward mud advanced prediction, it is possible to realize nuclear magnetic resonance, NMR by set of device
Excitation pulse with two kinds of methods of transient electromagnetic is launched and the reception of response signal.
To achieve these goals, the present invention adopts the following technical scheme that
A kind of nuclear magnetic resonance, NMR and transient electromagnetic integrative detection instrument, including main frame, transmitting coil, receiving transducer and on
Position machine system, main frame includes exporting nuclear magnetic resonance, NMR excitation pulse and the transmitter module of transient electromagnetic excitation pulse, gathers nuclear-magnetism altogether
Shake the receiver module with transient electromagnetic two kinds response signal, it is achieved the instruction between master system and host computer control module and number
According to mutual communication module, control receiver module, transmitter module and the control module of communication module, and the power supply being powered
Module；
Described transmitter module provides pulse output to transmitting coil, and the signal of receiving transducer collection is entered by described receiver module
Row pre-filtering processing and amplifying, and will process after signal be transferred to control module, it is achieved nuclear magnetic resonance, NMR excites with transient electromagnetic
Launching and the reception of response signal of pulse.
Described transmitting coil includes coil brace and launches wire, and coil brace is provided with transmitting coil, transmitter module
Receive the firing order of host computer, control transmitting coil and launch transient electromagnetic excitation pulse and nuclear magnetic resonance, NMR excitation pulse.
Described coil brace exterior contour is square, and internal stent is rice font structure, and support is provided with nine use
In the probe fixing hole of fixed reception probe, probe fixing hole is evenly distributed on meter font structure support, it is possible to visit more
Head array formula receives.
The nuclear magnetic resonance, NMR excitation pulse launched is the bipolarity cycle square wave pulse under Larmor frequency；The wink launched
Power transformation magnetic excitation pulse is dutycycle adjustable bipolarity Square wave pulses.
Described radiating circuit includes that bridge-type IGBT radiating circuit, each IGBT reversal connection are parallel with diode.
It is provided with sectionalizing joint on described transmitting wire, is carried out by the number of turn changing the length transmitting coil launching wire
It is adjusted flexibly.
The control module of described main frame includes main frame MCU, clock circuit and self-checking circuit, wherein, described clock circuit
Thering is provided the clock frequency needed for work for main frame MCU, self-checking circuit realizes the startup self-detection of system, and the result of self-inspection is uploaded
To host computer.
A kind of method of work based on above-mentioned instrument, comprises the following steps:
(1) square wave nuclear magnetic resonance, NMR excitation pulse is used to excite the NMR response in water: according to the earth's magnetic field magnetic measured
Induction calculates exomonental tranmitting frequency, uses square wave nuclear magnetic resonance, NMR excitation pulse to excite the nuclear magnetic resonance, NMR in water to ring
Should, the circuit that triggers in transmitter module controls conducting and the pass of IGBT in transmitting bridge according to received transmitting sequence
Disconnected；
(2) tunnel gushing water is dashed forward mud NMR response signals collecting and extraction: to reception in control module after pulse-off
Module and receiving transducer send signals collecting order, tentatively filter the NMR response signal gathered, and gather letter
The analog to digital conversion circuit number being input to receiver module completes the digitized of signal；
(3) tunnel gushing water is dashed forward mud Transient electromagnetic response signals collecting and extraction: it is adjustable that transient electromagnetic sends out employing dutycycle
Bipolarity Square wave pulses excites, and excitation pulse forward or backwards is closed and had no progeny, and control module is sent out to receiver module and receiving transducer
The number of delivering letters acquisition, is filtered the NMR response signal gathered, processes.
In described step (1), tranmitting frequency be the bipolarity cycle square wave pulse of Larmor frequency to tunnel face in face of
Hydrogen Proton in Fang Shuiti carries out nuclear magnetic resonance, NMR and excites.
In described step (1), control module generates a transmitting sequence according to the tranmitting frequency calculated and is sent to
To transmitter module, the triggering circuit in transmitter module being led according to the IGBT's in received transmitting sequence control transmitting bridge
Lead to and turn off.
In described step (1), the Larmor frequency of Hydrogen Proton in water in square-wave pulse frequency Shi Ce district, pulse mode is double
The cycle square wave pulse of polarity, the frequency spectrum of pulse only exists fundametal compoment and odd harmonic component.
In described step (2), signal is filtered processing the NMR response signal extracting arrowband by control module
Envelope signal, response signal by communication module be uploaded to master system storage and record.
The invention have the benefit that
(1) present invention abandons traditional single frequency sinusoidal ripple mode of excitation when design, thus eliminates bulky
Resonance circuit, the square wave nuclear magnetic resonance, NMR excitation pulse launched and dutycycle adjustable bipolarity Square wave pulses are by a set of
It is emitted back towards road to realize, improves emission effciency；
(2) the launching circuit volume that the present invention uses high-power ambipolar IGCT and associated trigger circuit to constitute is little, control
Precision processed is high and electric insulation easily realizes.Transmitter module design proposed by the invention can effectively alleviate transmitting mould
Block weight, reduces transmitter module volume, is conducive to carrying 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, NMR and two kinds of sound of transient electromagnetic
Induction signal will pass through analog digital conversion after the pre-filtering of probe is amplified and changes into digital signal, quilt after response signal digitized
Digital filter program in special signal processing chip processes, and it is high, anti-interference that this digital processing mode has precision
Ability is strong and can be by programme controlled advantage；
(4) present invention replaces conventional hardware filter circuit to also reduce hardware purchase cost and letter by digital filter
The volume of number receiver module；
(5) present invention devises a kind of coil brace that can simultaneously carry multiple probe, can meet Multi probe array
The observation requirements simultaneously received, improves observed efficiency；Additionally, the working method that Multi probe array receives avoids repeatedly simultaneously
Under launching condition when difference receives error between transmitted waveform, the situation during simulation of more composite theory, coil brace makes
Form with acetal plastic thermoplastic, sturdy and durable and can be disassembled and construction easy to assembly.
Accompanying drawing explanation
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 connector, 2, Type B support connector, 3, C-shaped support union joint, 4, probe fixing hole, 5,
Fixing bolt, 6, rice font cradling piece, 7, outside support bar.
Detailed description of the invention:
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
The nuclear magnetic resonance, NMR of mud advanced prediction and transient electromagnetic integrative detection instrument as it is shown in figure 1, a kind of tunnel gushing water is dashed forward
It is made up of main frame, transmitting coil, emission power, a set of receiving transducer and master system.Main frame comprises transmitter module, reception
Module, power module, control module and communication module.The control module of main frame is by main frame MCU, clock circuit and self-inspection electricity
Road forms.Main frame MCU selects high-performance embedded control chip, is responsible for controlling main frame modules and realizes corresponding function.Time
Clock circuit provides the clock frequency needed for work for main frame MCU.The operating frequency of whole host computer system is the most all by clock electricity
Road determines.Self-checking circuit realizes the startup self-detection of instrument, and the result of self-inspection is uploaded to master system.Main frame and host computer
Data between system and main frame modules are completed by communication bus with command communication.Each module of main frame divide have as follows
Function:
(1) transmitter module, it is achieved nuclear magnetic resonance, NMR and the transmitting of two kinds of excitation pulses of transient electromagnetic in tunnel.As nuclear-magnetism altogether
Shake the nucleus module with transient electromagnetic integrative detection instrument, and transmitter module uses a set of launching circuit to realize nuclear magnetic resonance, NMR and wink
The transmitting of two kinds of method excitation pulses of power transformation magnetic.The nuclear magnetic resonance, NMR excitation pulse launched is the bipolarity week under Larmor frequency
Phase square-wave pulse.The transient electromagnetic excitation pulse launched is dutycycle adjustable bipolarity Square wave pulses.Described it is transmitted back to
The core on road is the bridge circuit that constitutes of high-power insulated gate bipolar IGCT (IGBT) and associated trigger control circuit.Send out
Penetrate module and receive the conducting from the IGBT in the firing order control transmitting bridge of host computer and shutoff, it is achieved excitation pulse
Launch.
(2) receiver module, built-in signal processes nuclear magnetic resonance, NMR in chip realizes tunnel and responds signal with transient electromagnetic two kinds
Reception.As the nucleus module of nuclear magnetic resonance, NMR Yu transient electromagnetic integrative detection instrument, receiver module is by total digitalization
Signal receives and realizes nuclear magnetic resonance, NMR and the reception of two kinds of methods response signals of transient electromagnetic with processing mode.Response signal is by connecing
Receiving the receiver module of probe input main frame, the pre-filtering of receiving transducer is amplified and response signal is carried out preliminary treatment.Signal is defeated
Process chip through analog digital conversion input signal after entering receiver module to be further processed.Signal processing chip passes through program control number
Word wave filter responds the signal data after signal processes process the most at last respectively and uploads nuclear magnetic resonance, NMR and transient electromagnetic
To master system.
(3) power module, provides reliable working power for main frame.
(4) control module, controls each module of main frame and realizes response function.
(5) communication module, it is achieved main frame and the instruction of master system and data interaction.
Operationally, nuclear magnetic resonance, NMR and two kinds of methods of transient electromagnetic share a set of transmitting and receiving device.Specifically include with
Lower function:
(1) square wave nuclear magnetic resonance, NMR excitation pulse is used to excite the NMR response in water.Gushing water mud of dashing forward in tunnel is the most pre-
The nuclear magnetic resonance, NMR of report and transient electromagnetic integrative detection instrument tranmitting frequency are the bipolarity cycle square wave pulse of Larmor frequency
Hydrogen Proton in tunnel tunnel face front water body is carried out nuclear magnetic resonance, NMR excite.Main frame MCU is according to the earth's magnetic field magnetic induction measured
Exomonental tranmitting frequency f of Strength co-mputationt, 2 π × ft=ω t=γpB0.Raw according to the tranmitting frequency main frame MCU calculated
Become a transmitting sequence and send it to the transmitter module of main frame.The circuit that triggers in transmitter module is sent out according to received
Penetrate sequence and control conducting and the shutoff of IGBT in transmitting bridge.The pulse that main frame transmitter module is launched is square wave nuclear magnetic resonance, NMR
Excitation pulse.Square-wave pulse frequency (fundamental frequency) ftThe Larmor frequency of Hydrogen Proton in water in Shi Ce district, pulse mode is bipolarity
Cycle square wave pulse.The frequency spectrum of pulse only exists fundametal compoment and odd harmonic component.Fundametal compoment can be to front, tunnel
The dash forward Hydrogen Proton of mud disaster body weight of gushing water carries out nuclear magnetic resonance, NMR and excites and receive NMR response after square-wave pulse turns off
Signal.
(2) full digital tunnel gushing water is dashed forward mud NMR response signals collecting and extraction.Pulse-off aft engine MCU to
Receiver module and receiving transducer send signals collecting order.Receiving transducer is provided with preposition band and is connected with source filter amplifier, energy
Enough the NMR response signal gathered tentatively is filtered.Gather signal and be input to the analog to digital conversion circuit of receiver module
Complete the digitized of signal.During signal is uploaded to the dsp chip in receiver module by analog to digital conversion circuit afterwards.Digitized sound
After induction signal input DSP, signal is filtered by the digital quadrature locking amplification procedure woven in DSP as digital filter
Process the envelope signal of the NMR response signal extracting arrowband.Response signal is uploaded to upper by communication module afterwards
Machine system stores and record.During the reception of whole response signal, signal owning after preposition amplification with analog digital conversion
Signal processing is all to be realized by digital filter algorithm in dsp chip.
(3) full digital tunnel gushing water is dashed forward mud Transient electromagnetic response signals collecting and extraction.Transient electromagnetic sends out employing duty
Excite than adjustable bipolarity Square wave pulses.Excitation pulse forward or backwards is closed and is had no progeny, and main frame MCU is to receiver module and reception
Probe sends signals collecting order.Receiving transducer is provided with preposition band and is connected with source filter amplifier, it is possible to the core gathered
Magnetic Resonance tentatively filters.Gather signal to be input to the analog to digital conversion circuit of receiver module and complete the numeral of signal
Change.During signal is uploaded to the dsp chip in receiver module by analog to digital conversion circuit afterwards.Digital band pass filtering in dsp chip
Digitized signal is done bandpass filtering treatment by circuit, and the response signal after processing afterwards is uploaded to by communication module
Position machine system stores and record.During the reception of whole response signal, signal institute after preposition amplification with analog digital conversion
Having signal processing is all to be realized by digital filter algorithm in dsp chip.
A kind of tunnel gushing water dashed forward the nuclear magnetic resonance, NMR of mud advanced prediction and transient electromagnetic integrative detection instrument in conjunction with accompanying drawing 3
Operation principle do following elaboration.
Integrative detection instrument start aft engine is opened self-checking function and self-detection result is uploaded to master system shows.
As self-inspection is not passed through, master system then can produce warning and interrupt all appts operation, and operator fixes a breakdown and self-inspection is led to
Later integrative detection instrument just enters normal operating conditions.First pass through upper computer software when starting working and select nuclear magnetic resonance, NMR
Or Transient electromagnetic measure method.Operation principle to nuclear magnetic resonance, NMR Yu two kinds of measuring methods of transient electromagnetic is carried out respectively separately below
Illustrate:
(1) selecting nuclear magnetic resonance measuring method, integrative detection instrument enters high-frequency work pattern.First pass through instrument to survey
Amount current Earth magnetic field parameter also demarcates transmitting coil axially and direct north.Measured magnetic field of the earth parameter includes: earth magnetism
Field magnetic induction, earth magnetism geomagnetic inclination and geomagnetic declination.Main frame MCU calculates according to the earth's magnetic field magnetic induction measured and launches
Tranmitting frequency f of pulset, 2 π × ft=ω t=γpB0.Generate one according to the tranmitting frequency main frame MCU calculated and launch sequence
Arrange and send it to the transmitter module of main frame.The circuit that triggers in transmitter module controls to send out according to received transmitting sequence
Penetrate conducting and the shutoff of IGBT in bridge.IGBT conducting is calculated tranmitting frequency f with the frequency turned offt.Launch mould
The power supply of block is from the emission power being connected to external power supply.
The ambipolar cycle square wave pulse of the pulsed odd function that transmitter module is launched.Reason according to frequency analysis
Opinion, bipolarity cycle square wave pulse contains DC component, first-harmonic and higher harmonic components, when block-pulse function is odd function
Time, it is tranmitting frequency f that the frequency spectrum of pulse only exists fundametal compoment with odd harmonic component and fundamental frequencyt.Due to fundamental frequency
Equal with the Larmor frequency of Hydrogen Proton in water, excite therefore, it is possible to it is carried out nuclear magnetic resonance, NMR and be followed by square-wave pulse shutoff
Receive NMR response signal.Q in Fig. 31～Q4Four IGBT pipes lay respectively on four brachium pontis of bridge circuit, D1～D4
It is fly-wheel diode, ZLRepresent the impedance of excitation variable winding.
During impulse ejection, when square-wave pulse is forward, Q1With Q4Two pipe conductings；When square-wave pulse is negative sense
Time, Q2With Q3Two IGBT conductings.For preventing power supply short circuit, the negater circuit in transmitter module guarantees on the brachium pontis of two, the same side
Two pipes will not simultaneously turn on.During square-wave pulse commutates, sustained diode1～D4Electric current in proof load
Continuation mode suddenlys change the overvoltage caused by device breakdown because of inductive load current.D5And D6Two anti-paralleled diode compositions
Clamp circuit automatically shuts down when load terminal voltage is less than its conduction voltage drop, and output end voltage is clamped to zero；Ensure to launch electricity
Rapidly switching off of stream pulse.The excitation pulse persistent period is controlled according to required investigation depth.
Pulse-off aft engine MCU sends signals collecting order to receiver module and receiving transducer.Receiving transducer is arranged
Preposition band is had to be connected with source filter amplifier, it is possible to the NMR response signal gathered tentatively is filtered.Gather signal
The analog to digital conversion circuit being input to receiver module completes the digitized of signal.Signal is uploaded to receive by analog to digital conversion circuit afterwards
In dsp chip in module.Dsp chip is the special signal processor in receiver module, and his strong point is that a large amount of process is floated
The computing counted, is very suitable for signal processing.After digitized response signal input DSP, the digital quadrature lock woven in DSP
Determine amplification procedure and signal is filtered processing as digital filter the envelope of the NMR response signal extracting arrowband
Signal.Response signal is uploaded to master system storage record by communication module afterwards.According to set in firing order
Stacking fold carry out multi collect and superposition is finally completed the collection exciting and responding signal of nuclear magnetic resonance, NMR.
(2) selecting Transient electromagnetic measure method, integrative detection instrument enters low frequency operating mode.Pass through upper computer software
Set the emission parameters such as the frequency of Square wave pulses to be launched, dutycycle, stacking fold, emission current.Emission parameter sets
It is sent to main frame by serial communication after reserving.
The communication module of main frame receives emission parameter and sends it to main frame MCU.Main frame MCU generation transmitting sequence also will
It is sent to the transmitter module of main frame.The circuit that triggers in transmitter module controls transmitting bridge according to received transmitting sequence
In the conducting of IGBT and shutoff.
When bipolarity Square wave pulses is forward, Q1With Q4Two pipe conductings；When bipolarity Square wave pulses is negative sense
Time, Q2With Q3Two IGBT conductings.Different from nuclear magnetic resonance, NMR working method, close at forward or direction excitation pulse and have no progeny, main frame
MCU sends signals collecting order to receiver module and receiving transducer.Receiving transducer is provided with preposition band and is connected with source filter and amplification
Device, it is possible to the NMR response signal gathered tentatively is filtered.Collection signal is input to the modulus of receiver module and turns
Change circuit and complete the digitized of signal.
During signal is uploaded to the dsp chip in receiver module by analog to digital conversion circuit afterwards.Digital band pass in dsp chip
Digitized signal is done bandpass filtering treatment by filter circuit, and the response signal after processing afterwards is uploaded by communication module
Store and record to master system.Carry out multi collect according to stacking fold set in firing order and superposition is the completeest
Become the collection exciting and responding signal of nuclear magnetic resonance, NMR.
A kind of tunnel gushing water is dashed forward the nuclear magnetic resonance, NMR of mud advanced prediction and the transmitting coil of transient electromagnetic integrative detection instrument
Support is as shown in Figure 2.Whole transmitting coil bracket outer profile is square, and mid-stent becomes rice font structure, nine probes
Fixing hole 4 is evenly distributed on meter font support.Coil brace is by the cradling piece of acetal plastic thermoplastic and union joint group
Dress forms.
Coil brace bar has small-sized and large-scale two kinds of specifications.
The a length of 600cm in outside after small coil bracket assembled, the center distance of each probe fixing hole 4 is 150cm, probe
Fixing hole 4 diameter adjustment scope is 10～20cm.Bracket outer profile by 8 length of sides be 290cm, the cradling piece of a diameter of 5cm
Assemble.Cradling piece both sides have for connecting fixing screw thread, a length of 5cm shared by screw thread.Rice font internal stent bar 8 by
Eight root lengths are 420cm, and the cradling piece of a diameter of 5cm assembles.Every rice font support middle part be designed with a probe
Fixing hole 4, the left and right sides of fixing hole is respectively arranged with a fixing bolt 5.Fix bolt 5 by turn and can regulate the straight of fixing hole
Footpath thus by accept probe be fixed on probe fixing hole 4 in.The inner side of probe fixing hole 4 is provided with the coated foam-rubber cushion of rubber peel
To increase friction and the motility of regulation.Cradling piece both sides have for connecting fixing screw thread, a length of 4cm shared by screw thread.
The a length of 1200cm in outside after massive coil bracket assembled, the center distance of probe fixing hole 4 is 300cm, probe
Fixing hole 4 diameter adjustment scope is 10～20cm.Bracket outer profile by 8 length of sides be 590cm, the cradling piece of a diameter of 5cm
Assemble.Cradling piece both sides have for connecting fixing screw thread, a length of 5cm shared by screw thread.Rice font internal stent 8 root length
For 840cm, the cradling piece of a diameter of 5cm assembles.Every rice font support middle part be designed with one probe fixing hole
4, the left and right sides of fixing hole is respectively arranged with a fixing bolt 5.By turn fix bolt 5 can regulate fixing hole diameter thus
It is fixed on accepting probe in probe fixing hole 4.The inner side of probe fixing hole 4 is provided with the coated foam-rubber cushion of rubber peel and rubs to increase
Wipe and the motility of regulation.Cradling piece both sides have for connecting fixing screw thread, a length of 5cm shared by screw thread.
The union joint of coil brace bar has tri-kinds of structures of A, B, C.A type support connector 1 is used for connecting square coil and props up
Four summits of frame, Type B is used for C-shaped support union joint 3 being connected a meter font support.It is carved with screw thread in union joint and facilitates cradling piece
Assembling.Three union joints of A type support connector 1 become the distribution of " pawl " shape, and connecting cross section is square, and the length of side is 8cm.B
Three "T"-shaped distributions of union joint of type support connector 2, union joint cross section is square, and the length of side is 8cm.C-shaped support is even
The joint 3 not only connection as cradling piece but also the fixing hole as center probe.On union joint, both sides have two for fixed reception
The fixing bolt 5 of probe, for regulating the diameter of center probe fixing hole 4.The inner side of probe fixing hole 4 is provided with rubber suitcase
The foam-rubber cushion of quilt is to increase friction and the motility of regulation.
When utilizing nuclear magnetic resonance, NMR detection or transient electromagnetic method to carry out advanced prediction, central point is had to receive and array reception
Two ways is available.Before detecting, according to Fig. 2, transmitting coil bracket assembled is good.Use the work that central point receives
When making mode, probe is fixed on center probe fixing hole 4 and starts detection.When using the working method of array reception, will
Receiving transducer array is fixed on corresponding probe fixing hole 4 and starts detection.
Although the detailed description of the invention of the present invention is described by the above-mentioned accompanying drawing that combines, but not the present invention is protected model
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art are not
Need to pay various amendments or deformation that creative work can make still within protection scope of the present invention.
Claims (10)
1. nuclear magnetic resonance, NMR and a transient electromagnetic integrative detection instrument, is characterized in that: include that main frame, transmitting coil, reception are visited
Head and master system, main frame includes exporting nuclear magnetic resonance, NMR excitation pulse and the transmitter module of transient electromagnetic excitation pulse, adopts
Collection nuclear magnetic resonance, NMR and transient electromagnetic two kinds respond the receiver module of signal, it is achieved between master system and host computer control module
Instruction and the communication module of data interaction, control receiver module, transmitter module and the control module of communication module, and supply
The power module of electricity；
Described transmitter module provides pulse output to transmitting coil, before the signal of receiving transducer collection is carried out by described receiver module
Put filter amplifying processing, and the signal after processing is transferred to control module, it is achieved nuclear magnetic resonance, NMR and transient electromagnetic excitation pulse
Launch with response signal reception.
2. a kind of nuclear magnetic resonance, NMR as claimed in claim 1 and transient electromagnetic integrative detection instrument, is characterized in that: described transmitting
Coil includes coil brace and launches wire, and coil brace is provided with transmitting coil, and transmitter module receives the transmitting of host computer
Order, controls transmitting coil and launches transient electromagnetic excitation pulse and nuclear magnetic resonance, NMR excitation pulse.
3. a kind of nuclear magnetic resonance, NMR as claimed in claim 1 and transient electromagnetic integrative detection instrument, is characterized in that: described coil
Bracket outer profile is square, and internal stent is rice font structure, support is provided with nine for fixed reception probe
Probe fixing hole, probe fixing hole is evenly distributed on meter font structure support, it is possible to carry out Multi probe array reception.
4. a kind of nuclear magnetic resonance, NMR as claimed in claim 1 and transient electromagnetic integrative detection instrument, is characterized in that: launched
Nuclear magnetic resonance, NMR excitation pulse is the bipolarity cycle square wave pulse under Larmor frequency；The transient electromagnetic excitation pulse launched is
Dutycycle adjustable bipolarity Square wave pulses.
5. a kind of nuclear magnetic resonance, NMR as claimed in claim 1 and transient electromagnetic integrative detection instrument, is characterized in that: described transmitting
It is provided with sectionalizing joint on wire, is adjusted flexibly by the number of turn changing the length transmitting coil launching wire.
6. a kind of nuclear magnetic resonance, NMR as claimed in claim 1 and transient electromagnetic integrative detection instrument, is characterized in that: described main frame
Control module include main frame MCU, clock circuit and self-checking circuit, wherein, described clock circuit is that main frame MCU provides work
Required clock frequency, self-checking circuit realizes the startup self-detection of system, and the result of self-inspection is uploaded to host computer.
7. a method of work based on instrument as according to any one of claim 1-6, is characterized in that: comprise the following steps:
(1) square wave nuclear magnetic resonance, NMR excitation pulse is used to excite the NMR response in water: according to the earth's magnetic field magnetic induction measured
The exomonental tranmitting frequency of Strength co-mputation, uses square wave nuclear magnetic resonance, NMR excitation pulse to excite the NMR response in water, sends out
The circuit that triggers penetrated in module controls conducting and the shutoff of IGBT in transmitting bridge according to received transmitting sequence；
(2) tunnel gushing water is dashed forward mud NMR response signals collecting and extraction: to receiver module in control module after pulse-off
Send signals collecting order with receiving transducer, the NMR response signal gathered tentatively is filtered, gather signal defeated
The analog to digital conversion circuit entered to receiver module completes the digitized of signal；
(3) tunnel gushing water is dashed forward mud Transient electromagnetic response signals collecting and extraction: it is adjustable bipolar that transient electromagnetic sends out employing dutycycle
Property Square wave pulses excite, excitation pulse forward or backwards is closed and is had no progeny, and control module sends letter to receiver module and receiving transducer
Number acquisition, is filtered the NMR response signal gathered, processes.
8. method of work as claimed in claim 7, is characterized in that: in described step (1), and tranmitting frequency is Larmor frequency
Bipolarity cycle square wave pulse carries out nuclear magnetic resonance, NMR to the Hydrogen Proton in tunnel tunnel face front water body and excites；
Control module generates a transmitting sequence according to the tranmitting frequency calculated and sends it to transmitter module, transmitter module
In the circuit that triggers control conducting and the shutoff of IGBT in transmitting bridge according to received transmitting sequence.
9. method of work as claimed in claim 7, is characterized in that: in described step (1), square-wave pulse frequency Shi Ce district Nei Shui
The Larmor frequency of middle Hydrogen Proton, pulse mode is ambipolar cycle square wave pulse, and the frequency spectrum of pulse only exists fundametal compoment
With odd harmonic component.
10. method of work as claimed in claim 7, is characterized in that: in described step (2), signal is filtered by control module
Ripple processes the envelope signal of the NMR response signal extracting arrowband, and response signal is uploaded to host computer by communication module
System stores and record.
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