CN107102369A - Airborne low-temperature superconducting nuclear magnetic resonance shallow-layer oil seepage detection device and detection method - Google Patents
Airborne low-temperature superconducting nuclear magnetic resonance shallow-layer oil seepage detection device and detection method Download PDFInfo
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Abstract
The present invention relates to a kind of airborne low-temperature superconducting nuclear magnetic resonance shallow-layer oil seepage detection device and detection method, it is built with host computer and the airborne nuclear magnetic resonance shallow-layer oil seepage detection device of low-temperature superconducting by helicopter, pre-polarizing coil and Dewar bottle are lifted on below helicopter by rope, and Dewar bottle hanging is in pre-polarizing coil center, Dewar bottle axis is perpendicular to ground, Dewar bottle is connected and composed built with SQUID, Dewar bottle and pre-polarizing coil by the airborne nuclear magnetic resonance shallow-layer oil seepage detection device of wire and low-temperature superconducting.Using " air-launched-aerial reception " pattern, it is adaptable to which shallow-layer oil seepage is detected, solves the low problem of traditional instrument detection resolution, realize Noninvasive testing in situ, speed is fast, drastically increases signal to noise ratio, the inverting for after provides good basis.It is simple to operate, drastically increase investigative range.Detection time is not only reduced, increases detection area, moreover it is possible to obtain the high-precision testing result of high s/n ratio.
Description
Technical field
The present invention relates to a kind of aerogeophysical survey device and method, especially superconducting quantum interference device reception is low
Temperature superconductive nuclear magnetic resonance shallow-layer oil seepage detection device and method.
Background technology
Oil is a kind of non-renewable energy, is even more the indispensable strategic resource of national survival and development, in state
Immeasurable effect is played in terms of family's economy, social development and national defense safety.Nuclear magnetic resonance detection method is currently the only
Direct oilbearing stratum detection method, the seventies in last century, petroleum industry just started to introduce nuclear magnetic resonance technique reservoir described in well
Middle oil gas it is static and dynamic, be that the exploration and development of oil-gas reservoir is made that contribution, nuclear magnetic resonance detection method compare with it is other
Ball physical method is more accurate, while the expensive cost of drilling well is avoided, it is important as one in geophysical prospecting method
Research direction.But prior art has that snr of received signal is low, efficiency of inverse process is poor, and detection area is small, and speed is slow, cost height etc.
Problem.Therefore, it is necessary to explore and develop non-intrusion type nuclear magnetic resonance oil seepage detection means and detection method rapidly and efficiently.
SPUID (Superconducting Quantum Interference Device, SQUID) is
A kind of high magnetic-sensitive elements of sensitivity, can build superconducting magnetic sensor.It is widely used in biological magnetic field, magnetic field of the earth different
Often, the Weak magentic-field detection application such as the magnetic resonance such as extremely low field and geophysical exploration field, its detectivity has reached
Fly spy (10-15Tesla) magnitude.
CN102360703A discloses a kind of " magnet structure of nuclear magnetic resonance logging-while-drilling instrument used in oil well ", the magnet knot
Structure is coaxial with borehole axis to be set, and it includes permanent magnet magnetic patch and ferromagnetic material magnetic patch, described permanent magnet magnetic patch and ferromagnetic material magnetic
Block is along the coaxial connection in borehole axis direction.The inventive structure is simple, and stability is high, and the static uniform magnetic field produced by it has very deep
Investigation depth and enough magnetic field intensities, can produce the stratum nuclear-magnetism information of multiple different depths in underground, disclosure satisfy that stone
The need for oily downhole NMR detection, it is adaptable to the demand of modern petroleum exploration drilling well.
" serial-resonant nuclear magnetic resonance detection device and detection method " disclosed in CN103344996A, is by three-component magnetic
Field measurement circuit is connected by data wire with computer, and computer is adjustable high-power with output voltage respectively by serial bus
Power supply, emission controlling unit are connected with signal gathering unit, the adjustable large power supply of output voltage and high-power transmitting bridge
Connection, emission controlling unit is connected by controlling bus through high-power transmitting bridge with one end of transmitting coil, high-power transmitting
Bridge passes through the other end with humorous electric capacity and transmitting coil and connected, and emission controlling unit is connected by control line with high-voltage relay,
Emission controlling unit is connected by control line through signal gathering unit, amplifier circuit and high-voltage relay with receiving unit, high
One end of potential relay is connected with the first receiving unit, and the other end and the N receiving units of high-voltage relay are connected and composed.The hair
Bright usefulness is：The size and weight of reception device are reduced, the lateral resolution of nuclear magnetic resonance detection, small chi is improved
Very little receiving transducer has more preferable adaptability.
The nuclear magnetic resonance device of foregoing invention is needed for special detected object and application scenario is respectively provided with higher survey
Accuracy of measurement and good measurement effect, but all come with some shortcomings：Such as under strong noise environment, there is NMR signal and strong
Ambient noise compares very little, i.e., the problem of signal to noise ratio is very low, the adaptability to working environment is poor.
The content of the invention
The purpose of the present invention is that there is provided a kind of airborne core based on low-temperature superconducting for above-mentioned the deficiencies in the prior art
Magnetic resonance shallow-layer oil seepage detection device and method, high s/n ratio, it is adaptable to the quick detection of shallow-layer oil seepage, reach high efficiency
The purpose of high-resolution Noninvasive testing, saves detection time, and the shallow-layer oil seepage in very noisy area is detected with important
Meaning.
The purpose of the present invention is achieved through the following technical solutions：
A kind of airborne low-temperature superconducting nuclear magnetic resonance shallow-layer oil seepage detection device, is built with the He of host computer 2 by helicopter 1
The airborne nuclear magnetic resonance shallow-layer oil seepage detection device 3 of low-temperature superconducting, pre-polarizing coil 7 and Dewar bottle 4 are lifted on directly by rope
Rise the lower section of machine 1, and Dewar bottle 4 is hung in the center of pre-polarizing coil 7, the axis of Dewar bottle 4 perpendicular to ground, Dewar bottle 4 built with
SQUID5, Dewar bottle 4 and pre-polarizing coil 7 pass through wire and the airborne nuclear magnetic resonance shallow-layer oil seepage detection device 3 of low-temperature superconducting
Connect and compose.
The airborne nuclear magnetic resonance shallow-layer oil seepage detection device 3 of low-temperature superconducting is through main control module 8, driving by host computer 2
Module 9 and high-power transmitting bridge 10 are connected with pre-polarizing coil 7, and main control module 8 is through SQUID5, SQUID reading circuit
15th, signal conditioning circuit 14 and NI capture cards 13 are connected with host computer 2, and main control module 8 is connected with signal conditioning circuit 14,
Host computer 2 is connected through current acquisition module 11 with high-power transmitting bridge 10, and NI capture cards 13 can through main control module 8 and output
Power power-supply 12 is tuned up to connect and compose with high-power transmitting bridge 10.
SQUID reading circuits 15 are to be connected and composed by DC bias supplies 16 through amplifier 17 with feedback resistance 18.
The detection method of airborne low-temperature superconducting nuclear magnetic resonance shallow-layer oil seepage detection device, comprises the following steps：
A, according to detection zone job requirement, low-temperature superconducting nuclear magnetic resonance shallow-layer oil seepage is carried using helicopter 1 and detected
Device 3 and host computer 2, the lower section of helicopter 1, which is hung, is equipped with liquid nitrogen and SQUID5 in load Dewar bottle 4 and pre-polarizing coil 7, Dewar bottle,
Dewar bottle is placed in the center of pre-polarizing coil 7, and the axis of Dewar bottle 4 is perpendicular to ground, and pre-polarizing coil 7 is parallel to ground, directly
Rise machine 1 to fly along predetermined flight path, flying height is controlled, close to earth's surface；
B, select monitoring point in detection zone, helicopter 1, which flies to after test point, to be kept stopping in the air, records the inspection
The position of measuring point；
C, running parameter is set in host computer 2, parameter includes pre-polarizing current value, pre-polarizing time, AC current values
With alternating current launch time etc., co-ordinations are carried out by 8 pairs of each modules of main control module, by regulation direct-current bias electricity,
16, SQUID5 best operating point is determined, makes its output signal-noise ratio maximum, work is locked by SQUID reading circuits 15
Point；
D, main control module 8 are controlled by drive module 9 to high-power transmitting bridge 10, are sent out to pre-polarizing coil 7
Penetrate direct current and produce pre-polarizing magnetic field, the proton in shallow-layer leakage of oil is magnetized；
After the completion of e, pre-polarizing process, the alternating current value parameter that main control module 8 is set according to host computer 2, by driving
Module 9 controls high-power transmitting bridge 10 to be passed through the alternating current that frequency is local Larmor frequency into pre-polarizing coil 7, together
When actual emission current value is gathered by current acquisition module 11, and reach host computer；
After the completion of f, current emission, proton produces the change in magnetic field due to precession, SQUID5 receive be passed through it is therein
The change of magnetic flux, and magnetic flux change is converted into by electric signal by SQUID reading circuits 15, by signal conditioning circuit 14
Gathered afterwards by NI capture cards 13；
The NMR signal collected is sent to host computer 2 and stored by g, NI capture card 13；
H, the running parameter set according to step c, are repeated several times d-g steps, obtain multigroup NMR signal；
I, change emission current, are repeated several times d-h steps, obtain the oily measured signal of different depth underground leakage；
J, helicopter continue to fly along flight path, fly to after next test point and keep stopping in the air, record the survey
The position of point, repeats i steps, obtains the measured signal of next test point；
K, the above-mentioned j processes of repetition, carry out repeated detection, the NMR signal repeatedly obtained are carried out on Matlab
Inversion interpretation, obtains the oily data of underground leakage.
The pre-polarizing electric current is 150A, and the pre-polarizing time is 7s；The alternating current is 1A-20A, and launch time is
50ms。
Beneficial effect：Shallow-layer oil seepage nuclear magnetic resonance pre-polarizing detection means disclosed by the invention based on low-temperature superconducting and
Detection method, it is adaptable to which shallow-layer oil seepage detects that speed is fast, and the purpose of original position Noninvasive testing, safety and environmental protection can be achieved.Have
Machine combines SPUID, drastically increases signal to noise ratio, inverting provides good basis for after.Using
The mode of operation of " air-launched-aerial reception ", it is simple to operate, drastically increase investigative range.The proposition of the present invention, no
Detection time is only reduced, increases detection area, moreover it is possible to obtain the high-precision testing result of high s/n ratio, solve traditional instrument
The low problem of detection resolution, will establish important basis, with good for the underground oil and gas detectivity for improving China
Promotion prospect and promotional value, realistic meaning are huge.
Brief description of the drawings
Fig. 1 is airborne low-temperature superconducting nuclear magnetic resonance shallow-layer oil seepage detection device and detection method operating diagram
Fig. 2 is airborne low-temperature superconducting nuclear magnetic resonance shallow-layer oil seepage detection device structured flowchart in accompanying drawing 1；
Fig. 3 is the circuit diagram of SQUID reading circuits 15 in accompanying drawing 2；
1 helicopter, 2 host computers, 3 airborne low-temperature superconducting nuclear magnetic resonance shallow-layer oil seepage detection devices, 4 Dewar bottles,
5SQUID, 6 flight paths, 7 pre-polarizing coils, 8 main control modules, 9 drive modules, 10 high-power transmitting bridges, 11 electric currents are adopted
Collect module, 12 adjustable large power supplies, 13NI capture cards, 14 signal conditioning circuits, 15SQUID reading circuits, 16 direct current biasings
Power supply, 17 amplifiers, 18 feedback resistances.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
A kind of airborne low-temperature superconducting nuclear magnetic resonance shallow-layer oil seepage detection device, is built with the He of host computer 2 by helicopter 1
The airborne nuclear magnetic resonance shallow-layer oil seepage detection device 3 of low-temperature superconducting, pre-polarizing coil 7 and Dewar bottle 4 are lifted on directly by rope
Rise the lower section of machine 1, and Dewar bottle 4 is hung in the center of pre-polarizing coil 7, the axis of Dewar bottle 4 perpendicular to ground, Dewar bottle 4 built with
SQUID5, Dewar bottle 4 and pre-polarizing coil 7 pass through wire and the airborne nuclear magnetic resonance shallow-layer oil seepage detection device 3 of low-temperature superconducting
Connect and compose.
The airborne nuclear magnetic resonance shallow-layer oil seepage detection device 3 of low-temperature superconducting is through main control module 8, driving by host computer 2
Module 9 and high-power transmitting bridge 10 are connected with pre-polarizing coil 7, and main control module 8 is through SQUID5, SQUID reading circuit
15th, signal conditioning circuit 14 and NI capture cards 13 are connected with host computer 2, and main control module 8 is connected with signal conditioning circuit 14,
Host computer 2 is connected through current acquisition module 11 with high-power transmitting bridge 10, and NI capture cards 13 can through main control module 8 and output
Power power-supply 12 is tuned up to connect and compose with high-power transmitting bridge 10.
SQUID reading circuits 15 are to be connected and composed by DC bias supplies 16 through amplifier 17 with feedback resistance 18.
The detection method of airborne low-temperature superconducting nuclear magnetic resonance shallow-layer oil seepage detection device, comprises the following steps：
A, according to detection zone job requirement, low-temperature superconducting nuclear magnetic resonance shallow-layer oil seepage is carried using helicopter 1 and detected
Device 3 and host computer 2, the lower section of helicopter 1, which is hung, is equipped with liquid nitrogen and SQUID5 in load Dewar bottle 4 and pre-polarizing coil 7, Dewar bottle,
Dewar bottle is placed in the center of pre-polarizing coil 7, and the axis of Dewar bottle 4 is perpendicular to ground, and pre-polarizing coil 7 is parallel to ground, directly
Rise machine 1 to fly along predetermined flight path, flying height is controlled, close to earth's surface；
B, select monitoring point in detection zone, helicopter 1, which flies to after test point, to be kept stopping in the air, records the inspection
The position of measuring point；
C, running parameter is set in host computer 2, parameter includes pre-polarizing current value, pre-polarizing time, AC current values
With alternating current launch time etc., co-ordinations are carried out by 8 pairs of each modules of main control module, by regulation direct-current bias electricity,
16, SQUID5 best operating point is determined, makes its output signal-noise ratio maximum, work is locked by SQUID reading circuits 15
Point；
D, main control module 8 are controlled by drive module 9 to high-power transmitting bridge 10, are sent out to pre-polarizing coil 7
Penetrate direct current and produce pre-polarizing magnetic field, the proton in shallow-layer leakage of oil is magnetized；Pre-polarizing electric current is 150A, during pre-polarizing
Between be 7s；The alternating current is 1A-20A, and launch time is 50ms.
After the completion of e, pre-polarizing process, the alternating current value parameter that main control module 8 is set according to host computer 2, by driving
Module 9 controls high-power transmitting bridge 10 to be passed through the alternating current that frequency is local Larmor frequency into pre-polarizing coil 7, together
When actual emission current value is gathered by current acquisition module 11, and reach host computer；
After the completion of f, current emission, proton produces the change in magnetic field due to precession, SQUID5 receive be passed through it is therein
The change of magnetic flux, and magnetic flux change is converted into by electric signal by SQUID reading circuits 15, by signal conditioning circuit 14
Gathered afterwards by NI capture cards 13；
The NMR signal collected is sent to host computer 2 and stored by g, NI capture card 13；
H, the running parameter set according to step c, are repeated several times d-g steps, obtain multigroup NMR signal；
I, change emission current, are repeated several times d-h steps, obtain the oily measured signal of different depth underground leakage；
J, helicopter continue to fly along flight path, fly to after next test point and keep stopping in the air, record the survey
The position of point, repeats i steps, obtains the measured signal of next test point；
K, the above-mentioned j processes of repetition, carry out repeated detection, the NMR signal repeatedly obtained are carried out on Matlab
Inversion interpretation, obtains the oily data of underground leakage.
The lower section of helicopter 1 is loaded in as shown in figure 1, being hung including pre-polarizing coil 7 and the Dewar bottle 4 for being mounted with SQUID5,
SQUID device is operated in temperature that liquid nitrogen provided in 77K environment, Dewar bottle 4 is the cryostat for storing liquid nitrogen,
For cooling down SQUID5, Dewar 4 is placed on the center of pre-polarizing coil 7, and pre-polarizing coil 7 not only produces pre-polarizing magnetic field,
AC magnetic field is also produced, switching is responsible for by the nuclear magnetic resonance pre-polarizing device based on low-temperature superconducting, by pre-polarizing coil
It is passed through DC current and produces pre-polarizing magnetic field, the proton in shallow-layer oil is magnetized, increases the macroscopic magnetization intensity of oil body.In advance
After the completion of polarization process, by pre-polarizing coil 7 to the excitation current that underground tranmitting frequency is local Larmor frequency, excite ground
Proton formation macroscopic moment in lower shallow-layer oil, is excited after stopping, proton spin produces relaxation phenomena, passes through SQUID device 5
Sense magnetic flux change caused by macroscopic moment precession, and NMR signal is read out by SQUID reading circuits 15, pass through
Signal conditioning circuit 14 is crossed with after, is gathered by NI capture cards, is finally reached host computer and stored.
A kind of airborne nuclear magnetic resonance shallow-layer oil seepage detection method based on low-temperature superconducting, comprises the following steps：
A, as shown in figure 1, the airborne and of low-temperature superconducting nuclear magnetic resonance shallow-layer oil seepage detection device 3 is carried in the inside of helicopter 1
Host computer 2, the lower section of helicopter 1, which is hung, carries the Dewar 4 for being loaded with SQUID device 5 and pre-polarizing coil 7, and Dewar bottle 4, which is hung, is loaded in pre- pole
Change the center of coil 7, the length of side of pre-polarizing coil 7 is 6m, and the number of turn is 15 circles, and coil plane is each parallel to ground, helicopter
1 flies along flight path 6, controls flying height, makes coil in the case of non-contiguously table barrier close to ground
Table, makes the signal amplitude of collection maximum；
B, as shown in Fig. 2 connecting detection device, host computer 2 is connected with main control module 8, main control module 8 respectively with drive
Dynamic model block 9, SQUID 5, the adjustable large power supply 12 of output, signal conditioning circuit 14 and NI capture cards 13 are connected, and drive mould
Block 9 is connected with high-power transmitting bridge 10, and high-power transmitting bridge 10 is respectively with exporting adjustable large power supply 12, and electric current is adopted
Collection module 11 and pre-polarizing coil 7 are connected, and current acquisition module 11 and host computer 2 are connected, and SQUID device 5 and SQUID is read
Circuit 15 is connected, and SQUID reading circuits 15 are connected with signal conditioning circuit 14, and signal conditioning circuit 14 and NI capture cards 13 connect
Connect, NI capture cards 13 are connected with host computer 2.
C, detection zone selected according to job requirement, select monitoring point in detection zone, test point is arrived in the flight of helicopter 1
Keep stopping in the air afterwards, record the position of the test point；
After d, unlatching low-temperature superconducting nuclear magnetic resonance pre-polarizing device 3, running parameter is set in host computer 2, passes through master control
Each module of 8 pairs of molding block carries out co-ordination；
E, main control module 8 are controlled by drive module 9 to high-power transmitting bridge 10, are sent out to pre-polarizing coil 7
DC current is penetrated, pre-polarizing magnetic field is produced, the proton in oil is magnetized, increases the macroscopic magnetization intensity of oil body, it is generally pre-
Polarization current is 150A, and the pre-polarizing time is 7s.Export adjustable large power supply 12 for high-power transmitting bridge 10 drive it is pre-
Polarizing coil 7 provides energy；
After the completion of f, pre-polarizing process, the alternating current value parameter that main control module 8 is set according to host computer 2, by driving
Module 9 controls high-power transmitting bridge 10 to be passed through the alternating current that frequency is local Larmor frequency into pre-polarizing coil 7, leads to
Normal launch time is 50ms, while gathering actual emission current value by current acquisition module 11, reaches host computer 2；
After the completion of g, current emission, proton produces the change in magnetic field due to precession, and SQUID 5, which is received, is passed through wherein magnetic
The change of flux, and magnetic flux change is converted into by electric signal by SQUID reading circuits 15, after signal conditioning circuit 14
Gathered by NI capture cards 13.
The NMR signal collected is sent to host computer 2 and stored by h, NI capture card 13.
I, according to the running parameter set during c, e-h processes are repeated several times, multigroup magnetic resonance signal is obtained；
J, change emission current, the alternating current of different pulse squares be set ascendingly, the size of excitation current by
Depending on investigation depth, usually 1A to 20A, is repeated several times e-i processes, obtains the NMR signal of different investigation depths；
K, helicopter continue to fly along flight path, fly to after next test point and keep stopping in the air, and adjacent two
Individual test point spacing is 15m, records the position of the measuring point, repeats j processes, obtains the measured signal of next test point；
L, repeatable above-mentioned k processes, carry out inversion interpretation by obtained NMR signal on Matlab, obtain underground
Oil seepage situation.
Embodiment 1
A kind of airborne nuclear magnetic resonance shallow-layer oil seepage detection method based on low-temperature superconducting is that one kind is applied to strong noise, soon
Fast effective large area detection, non-invasive inspection methods detect significant to shallow-layer oil seepage.Pre-polarizing coil 7
Hung with the Dewar bottle 4 for being loaded with SQUID5 and be loaded in the lower section of helicopter 1, Dewar bottle 4 is placed on the center of pre-polarizing coil 7, pre- pole
Change coil 7 and not only produce pre-polarizing magnetic field, also produce AC magnetic field, born by the nuclear magnetic resonance pre-polarizing device based on low-temperature superconducting
Duty switching, pre-polarizing magnetic field is produced by being passed through DC current in pre-polarizing coil, and the proton in shallow-layer oil is magnetized,
Increase the macroscopic magnetization intensity of oil body.After the completion of pre-polarizing process, drawn by pre-polarizing coil 7 to underground tranmitting frequency to be local
The excitation current of More's frequency, excites the proton formation macroscopic moment in underground shallow layer oil, excites after stopping, proton spin is produced
Relaxation phenomena, senses magnetic flux change caused by macroscopic moment precession, and pass through SQUID reading circuits 15 by SQUID device 5
NMR signal is read out, by signal conditioning circuit 14 with after, is gathered by NI capture cards, host computer progress is finally reached
Storage.
Host computer 2 is connected with main control module 8, main control module 8 respectively with drive module 9, SQUID 5, export it is adjustable
Large power supply 12, signal conditioning circuit 14 and NI capture cards 13 connect, drive module 9 connects with high-power transmitting bridge 10
Connect, high-power transmitting bridge 10 is respectively with exporting adjustable large power supply 12, and current acquisition module 11 and pre-polarizing coil 7 connect
Connect, current acquisition module 11 and host computer 2 are connected, and SQUID device 5 is connected with SQUID reading circuits 15, SQUID reading circuits
15 are connected with signal conditioning circuit 14, and signal conditioning circuit 14 is connected with NI capture cards 13, and NI capture cards 13 connect with host computer 2
Connect.
A kind of airborne nuclear magnetic resonance shallow-layer oil seepage detection method based on low-temperature superconducting, comprises the following steps：
A, the inside of helicopter 1 carry low-temperature superconducting nuclear magnetic resonance pre-polarizing device 2 and host computer 2, and the lower section of helicopter 1 is hung
The Dewar 4 and pre-polarizing coil 7 for being loaded with SQUID device 5 are carried, Dewar 4, which is hung, is loaded in the center of pre-polarizing coil 7, pre-polarizing
The length of side of coil 7 is 6m, and the number of turn is 15 circles, and coil plane flies each parallel to ground, helicopter 1 along flight path 6, and control flies
Row height, makes coil, close to earth's surface, make the signal amplitude of collection maximum in the case of non-contiguously table barrier；
B, detection zone selected according to job requirement, select monitoring point in detection zone, test point is arrived in the flight of helicopter 1
Keep stopping in the air afterwards, record the position of the test point；
After c, unlatching low-temperature superconducting nuclear magnetic resonance pre-polarizing device 3, running parameter is set in host computer 2, passes through master control
Each module of 8 pairs of molding block carries out co-ordination；
D, main control module 8 are controlled by drive module 9 to high-power transmitting bridge 10, are sent out to pre-polarizing coil 7
DC current is penetrated, pre-polarizing magnetic field is produced, the proton in oil is magnetized, increases the macroscopic magnetization intensity of oil body, it is generally pre-
Polarization current is 150A, and the pre-polarizing time is 7s.Export adjustable large power supply 12 for high-power transmitting bridge 10 drive it is pre-
Polarizing coil 7 provides energy；
After the completion of e, pre-polarizing process, the alternating current value parameter that main control module 8 is set according to host computer 2, by driving
Module 9 controls high-power transmitting bridge 10 to be passed through the alternating current that frequency is local Larmor frequency into pre-polarizing coil 7, leads to
Normal launch time is 50ms, while gathering actual emission current value by current acquisition module 11, reaches host computer 2；
After the completion of f, current emission, proton produces the change in magnetic field due to precession, and SQUID 5, which is received, is passed through wherein magnetic
The change of flux, and magnetic flux change is converted into by electric signal by SQUID reading circuits 15, after signal conditioning circuit 14
Gathered by NI capture cards 13.
The NMR signal collected is sent to host computer 2 and stored by h, NI capture card 13.
I, according to the running parameter set during c, repeat d-f processes 32 times, obtain 32 groups of magnetic resonance signals；
G, change emission current, the alternating current of 8 groups of different pulse squares is set from 1A to 20A, d-i processes 16 are repeated
It is secondary, obtain the NMR signal of different investigation depths；
J, helicopter continue to fly along flight path, fly to after next test point and keep stopping in the air, and adjacent two
Individual test point spacing is 15m, records the position of the measuring point, repeats g processes, obtains the measured signal of next test point；
K, the above-mentioned j processes of repetition 4 times, carry out inversion interpretation by obtained NMR signal on Matlab, obtain ground
Lower oil seepage situation.
Claims (5)
1. a kind of airborne low-temperature superconducting nuclear magnetic resonance shallow-layer oil seepage detection device, it is characterised in that be built-in by helicopter (1)
There are host computer (2) and the airborne nuclear magnetic resonance shallow-layer oil seepage detection device (3) of low-temperature superconducting, pre-polarizing coil (7) and Dewar bottle
(4) it is lifted on by rope below helicopter (1), and Dewar bottle (4) hanging is in pre-polarizing coil (7) center, Dewar bottle (4) axle
Line passes through wire and low-temperature superconducting perpendicular to ground, Dewar bottle (4) built with SQUID5, Dewar bottle (4) and pre-polarizing coil (7)
Airborne nuclear magnetic resonance shallow-layer oil seepage detection device (3) connects and composes.
2. according to the airborne low-temperature superconducting nuclear magnetic resonance shallow-layer oil seepage detection device described in claim 1, it is characterised in that low
The airborne nuclear magnetic resonance shallow-layer oil seepage detection device (3) of temperature superconductive is through main control module (8), drive module by host computer (2)
(9) it is connected with high-power transmitting bridge (10) with pre-polarizing coil (7), main control module (8) is read through SQUID (5), SQUID
Circuit (15), signal conditioning circuit (14) and NI capture cards (13) are connected with host computer (2), and main control module (8) is adjusted with signal
Circuit (14) connection is managed, host computer (2) is connected through current acquisition module (11) with high-power transmitting bridge (10), NI capture cards
(13) connected and composed through main control module (8) and the adjustable large power supply (12) of output with high-power transmitting bridge (10).
3. according to the airborne low-temperature superconducting nuclear magnetic resonance shallow-layer oil seepage detection device described in claim 2, it is characterised in that
SQUID reading circuits (15) are to be connected and composed by DC bias supplies (16) through amplifier (17) with feedback resistance (18).
4. according to the detection method of the airborne low-temperature superconducting nuclear magnetic resonance shallow-layer oil seepage detection device described in claim 1, its
It is characterised by, comprises the following steps：
A, according to detection zone job requirement, low-temperature superconducting nuclear magnetic resonance shallow-layer oil seepage detection device is carried using helicopter 1
(3) and host computer (2), hung below helicopter (1) in load Dewar bottle (4) and pre-polarizing coil (7), Dewar bottle (4) equipped with liquid nitrogen
With SQUID (5), Dewar bottle is placed in the center of pre-polarizing coil (7), and the axis of Dewar bottle (4) is perpendicular to ground, pre-polarizing coil
(7) parallel to ground, helicopter (1) flies along predetermined flight path, flying height is controlled, close to earth's surface；
B, select monitoring point in detection zone, keep stopping in the air after helicopter (1) flight to test point, record the detection
The position of point；
C, running parameter is set in the host computer (2), parameter include pre-polarizing current value, the pre-polarizing time, AC current values and
Alternating current launch time, co-ordination is carried out to each module by main control module (8), passes through regulation direct-current bias power supply
(16) best operating point of SQUID (5) is determined, makes its output signal-noise ratio maximum, is locked by SQUID reading circuits (15)
Operating point；
D, main control module (8) are controlled by drive module (9) to high-power transmitting bridge (10), to pre-polarizing coil
(7) transmitting direct current produces pre-polarizing magnetic field, and the proton in shallow-layer leakage of oil is magnetized；
After the completion of e, pre-polarizing process, the alternating current value parameter that main control module (8) is set according to host computer (2), by driving
Module (9) controls high-power transmitting bridge (10) to be passed through the alternation that frequency is local Larmor frequency into pre-polarizing coil (7)
Electric current, while gathering actual emission current value by current acquisition module (11), and reaches host computer；
After the completion of f, current emission, proton produces the change in magnetic field due to precession, and SQUID5, which is received, is passed through magnetic flux therein
The change of amount, and magnetic flux change is converted into by electric signal by SQUID reading circuits (15), by signal conditioning circuit (14)
Gathered afterwards by NI capture cards (13)；
The NMR signal collected is sent to host computer (2) and stored by g, NI capture card (13)；
H, the running parameter set according to step c, are repeated several times d-g steps, obtain multigroup NMR signal；
I, change emission current, are repeated several times d-h steps, obtain the oily measured signal of different depth underground leakage；
J, helicopter continue to fly along flight path, fly to after next test point and keep stopping in the air, record the measuring point
Position, repeats i steps, obtains the measured signal of next test point；
K, the above-mentioned j processes of repetition, carry out repeated detection, the NMR signal repeatedly obtained are carried out into inversion solution on Matlab
Release, obtain the oily data of underground leakage.
5. according to the airborne nuclear magnetic resonance shallow-layer oil seepage detection method based on low-temperature superconducting described in claim 4, its feature
It is, the pre-polarizing electric current is 150A, the pre-polarizing time is 7s；The alternating current is 1A-20A, and launch time is 50ms.
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