CN103344995B - Introduce the detection method of the nuclear magnetic resonance directional detection device of artificial magnetic field - Google Patents
Introduce the detection method of the nuclear magnetic resonance directional detection device of artificial magnetic field Download PDFInfo
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- CN103344995B CN103344995B CN201310254356.3A CN201310254356A CN103344995B CN 103344995 B CN103344995 B CN 103344995B CN 201310254356 A CN201310254356 A CN 201310254356A CN 103344995 B CN103344995 B CN 103344995B
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Abstract
The present invention relates to a kind of nuclear magnetic resonance directional detection device and the detection method of introducing artificial magnetic field.Be connected with transmitting coil with high-power transmitting bridge, transmitting coil, resonant capacitance with the adjustable large power supply of output through main control unit respectively by notebook computer, notebook computer warp/D collecting unit, amplifier circuit, signal conditioning circuit are connected with receiving coil with high toggle switch, and notebook computer connects and composes through solenoid driver circuit and electromagnet.The magnetic field that the present invention utilizes electromagnet to produce and natively magnetic field acting in conjunction, improve the frequency of nuclear magnetic resonance detection, enhances the ability of anti-industrial frequency harmonic interference; The magnetic field intensity that electromagnet produces, with distance change, produces a gradient magnetic, improves the resolution of detection; Electromagnet direction variable, can realize the detection of specific direction, specific range, solve an accurate location difficult problem for water content.There is direct detection, explain that unique, result quantizes, measures advantage accurately.
Description
Technical field
The present invention relates to a kind of utilize nuclear magnetic resonance principle to carry out detecting geophysical prospecting equipment and method, especially a kind of detection method introducing the nuclear magnetic resonance directional detection device of artificial magnetic field.
Background technology
In underground construction, especially in the underground tunneling engineering that tunnel, mine etc. are large-scale, due to complex geologic conditions, the gushing water caused by underground water, gush the geologic hazards such as mud and happen occasionally, bring huge disaster and inestimable economic loss to construction safety.How to carry out accurately, effectively detecting to the water content of surrounding in underground works, become an important research direction in geophysical exploration method.
CN101603423 discloses " a kind of direct current forwarding method of bed-parallel advanced detection of water bearing in coal mine roadway ", use mine direct current method seven electrode system sniffer, 4 electrodes of A 1 are arranged near coal mine roadway heading end, A2, A3, A4 structure is arranged in a straight line, another root transmitting electrode B arranged respectively at infinite point forms loop, direct current is fed to underground, set up DC electric field, use the electrode M of 2 relative fixed ranges at rear, tunnel simultaneously, N measures its electric field distribution law, after special-purpose assorted interpretation technique process, obtain the electrical segment information of the geologic body met head in the 0m ~ 140m of front in digging laneway or tunnel.Forward probe device and method involved by foregoing invention has investigation depth far away, detection efficiency and precision are also higher, but there is a significantly deficiency, whether is exactly this device exists water content judge by reconnoitring water-bearing structure and layer position, be a kind of indirect measurement method, accurately can not obtain the important information parameters such as the water-bearing zone thickness of front water body, water cut size.
CN201554418U discloses a kind of Against Water Inrush device and adopt the drilling machine of this device of holing, the boring Against Water Inrush device of this invention, by sleeve pipe and be welded on sleeve pipe one end, and the hold down gag be connected with sleeve pipe is formed, borer drill rod passes from sleeve pipe, described hold down gag, include the packing room be connected as a single entity with sleeve pipe, be filled in packing chamber interior, packing and the one end of playing press seal effect are welded with flange base, one end is deep into the packing gland contacted in packing room and with packing, wherein, described packing room is welded with flange, flange has hole, the flange of the flange base of packing gland also has the hole corresponding with it, packing hold-down bolt passes through from hole, packing gland and packing room are connected and fixed, when there is gushing water in this utility model, reliably can close gushing water rapidly, thus can effectively prevent to flood well accident, this utility model also relate to a kind of drilling machine of quarrying apparatus simultaneously.The boring Against Water Inrush device of foregoing invention can detect gushing water under ore deposit, but there is wretched insufficiency, and that first will be holed exactly and judge afterwards.Belong to destructive detection method, inefficiency, and have certain danger.
CN102062877A discloses a kind of nuclear magnetic resonance sniffer to front water body forward probe and detection method.Be connected with system controller, large power supply, signal gathering unit respectively by serial bus by computing machine; system controller is through bridge circuit driver device, high-power H type transmitting bridge and join humorous electric capacity and be connected with transmitting coil, and receiving coil is connected through protection switch, signal condition unit, amplifier and signal gathering unit and forms.This contrive equipment adopts magnetic nuclear resonance method to detect, have and explain that unique, result quantizes, measures feature accurately, compared with existing Detection Techniques, this invention can to whether there is water content, and the important information such as the water cut size of water content makes detection.But the nuclear magnetic resonance sniffer to front water body forward probe of foregoing invention and detection method only adopt magnetic field natively, its magnetic field intensity only has tens uT, relative weak, and direction, terrestrial magnetic field is immutable, adopt this device can not accurately tell detection front or there is water content in rear, namely can not realize the object of directed forward probe.
Summary of the invention
Technical matters to be solved by this invention is the deficiency existed for above-mentioned prior art, provides a kind of nuclear magnetic resonance directional detection device and method introducing artificial magnetic field.
The object of the invention is to be achieved through the following technical solutions:
Introduce the nuclear magnetic resonance directional detection device of artificial magnetic field, be connected with one end of transmitting coil 16 with high-power transmitting bridge 6 through exporting adjustable large power supply 4 by notebook computer 3, notebook computer 3 is through main control unit 8, transmitting bridge drives 5, high-power transmitting bridge 6 is connected with the other end of resonant capacitance 7 with transmitting coil 16, main control unit 8 is connected with signal conditioning circuit 10 and high toggle switch 9 respectively, main control unit 8 is connected with A/D collecting unit 12, notebook computer 3 is connected with the first electromagnet 2 through the first solenoid driver circuit 1, notebook computer 3 is through A/D collecting unit 12, amplifier circuit 11, signal conditioning circuit 10 is connected with receiving coil 15 with high toggle switch 9, notebook computer 3 is connected with the second electromagnet 14 through the second solenoid driver circuit 13, notebook computer 3 and three-component geomagnetic field measuring circuit 17 connect and compose.
Described main control unit 8 be by instruction processing unit respectively with communication module, the first timer, gather synchronous signal output end mouth, switching synchronization signals output port, the second timer, signal condition cell location signal output port, frequency generator, bridge circuit driver signal output port and the 3rd timer and be connected, first timer is connected with collection synchronous signal output end mouth, second timer is connected with switching synchronization signals output port, and frequency generator connects and composes through bridge circuit driver signal output port and the 3rd timer.
Introduce the nuclear magnetic resonance directional detection method of artificial magnetic field, comprise the following steps:
A, in survey district, select a sensing point, the laying plane being coil with the imaginary vertical surface of this sensing point, lay receiving coil 15 and transmitting coil 16, on rear side of transmitting coil and receiving coil, place the first electromagnet 2 and the second electromagnet 14;
B, measure local terrestrial magnetic field direction and intensity by three-component geomagnetic field measuring circuit 17, according to detection direction, detection range and direction, local terrestrial magnetic field and intensity, calculated by notebook computer 3 and the direction and intensity of the first electromagnet 2 and the second electromagnet 14 is set, then respectively the first electromagnet 2 and the second electromagnet 14 are driven by the first solenoid driver circuit 1 and the second solenoid driver circuit 13, the artificial magnetic field utilizing electromagnet to produce and magnetic field acting in conjunction natively, thus construct the magnetic field required for nuclear magnetic resonance directional detection;
C, notebook computer 3 control to export adjustable large power supply 4 by Serial Port Line, by changing the size of its output voltage, change the size of the excitation current on transmitting coil 16, what namely produce varying strength excites magnetic field, by exciting of varying strength magnetic field, realize the detection apart from the different far and near water body of transmitting coil;
D, main control unit 8 produce 40ms frequency signal, 5 are driven to drive high-power transmitting bridge 6 by transmitting bridge, after transmitting bridge 6 is driven, the output voltage utilizing large power supply 4 to produce applies 40ms transmitter current to resonant capacitance 7 and transmitting coil 16, realizes exciting front water body;
E, when exciting, main control unit 8 controls high toggle switch 9, it is made to be in off-state, signal receiving end is protected, after exciting end, through 90ms, main control unit 8 controls high toggle switch 9 and closes, and the signal produced in receiving coil 15 is sent into signal condition unit 10 by high toggle switch 9;
F, signal condition unit 10 pairs of signals carry out filtering process, main control unit 8 passes through centre frequency and the bandwidth of control line control signal conditioning unit 10 median filter, filtering doping noise in the signal, relatively pure signal is sent into amplifier circuit 11, after amplifier circuit 11 amplifies faint signal, deliver to A/D collecting unit 12, the collection of main control unit 8 control A/D collecting unit 12 starts and the end time, A/D collecting unit 12 utilizes analog to digital converter to convert the simulating signal that amplifier circuit 11 exports to digital signal, and the data obtained after conversion are delivered to notebook computer 3, carry out display and the preservation of data,
G, by step f display with preserve NMR signal carry out characteristic parameter extraction, obtain relaxation time, initial amplitude, frequency parameter, the data recorded are carried out inversion procedure, calculate on assigned direction, specific range, water cut, permeability hydrogeological parameter in specific region, for contingent gushing water, gush mud geologic hazard and to furnish a forecast foundation.
Beneficial effect: introduce the nuclear magnetic resonance directional detection device of artificial magnetic field and detection method, the characteristic of combine direct detection that nuclear magnetic resonance detection method has, explain that unique, result quantizes, measure magnitude of field intensity that advantage and electromagnet accurately have, direction-agile.On the basis in magnetic field natively, introduce electromagnet, the magnetic field intensity of electromagnet is much larger than the geomagnetic field intensity of tens uT, the artificial magnetic field utilizing electromagnet to produce and magnetic field acting in conjunction natively, the magnetic field built improves the frequency of operation of nuclear magnetic resonance detection, thus enhances the ability of the anti-industrial frequency harmonic interference of device; The magnetic field intensity that electromagnet produces, with distance change, produces a gradient magnetic, improves the resolution of detection; The direction of electromagnet can change, and can realize directional detection.When adopting this contrive equipment to detect the water content in the underground works such as tunnel, mine, not only can detect whether there is water content accurately and efficiently, and the water cut size of water content, and the object of the region directional detection to assigned direction, specific range can be realized, thus the position of water content can be found out more reliably, accurately, solve an accurate location difficult problem for water content.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the nuclear magnetic resonance directional detection device introducing artificial magnetic field;
Fig. 2 is the structured flowchart of main control unit 8 in accompanying drawing 1.
1 first solenoid driver circuit, 2 first electromagnet, 3 notebook computers, 4 export adjustable large power supply, and 5 transmitting bridge drive, 6 high-power transmitting bridge, 7 resonant capacitances, 8 main control units, 9 high toggle switch, 10 signal condition unit, 11 amplifier circuits, 12A/D collecting unit, 13 second solenoid driver circuits, 14 second electromagnet, 15 receiving coils, 16 transmitting coils, 17 three-component geomagnetic field measuring circuit.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail:
Introduce the nuclear magnetic resonance directional detection device of artificial magnetic field, by serial bus and main control unit 8 and export adjustable large power supply 4 and be connected by notebook computer 3, notebook computer 3 is connected with three-component geomagnetic field measuring circuit 17 by data line, main control unit 8 drives 5 to be connected by control line and transmitting bridge, transmitting bridge drives 5 to be connected with high-power transmitting bridge 6 by signal wire, the output terminal of large power supply 4 is connected with high-power transmitting bridge 6 by interactive signal line, the output terminal of transmitting bridge 6 is connected with resonant capacitance 7 by signal wire, resonant capacitance 7 is connected by signal wire one end with transmitting coil 16, transmitting bridge 6 is connected with transmitting coil 16 other end by signal wire.Notebook computer 3 is connected with the first electromagnet 2 through the first solenoid driver circuit 1 by control line, and notebook computer 3 is connected with the second electromagnet 14 through the second solenoid driver circuit 13 by control line.Receiving coil 15 is connected by signal wire one end with high toggle switch 9, the other end of high toggle switch 9 is connected by the input end of signal wire with signal conditioning circuit 10, the output terminal of signal condition unit 10 is connected by the input end of signal wire with amplifier circuit 11, the output terminal of amplifier circuit 11 is connected by the input end of signal wire with A/D collecting unit 12, and the output terminal of A/D collecting unit 12 is connected with notebook computer 3 by data line.Main control unit 8 is connected with high toggle switch 9, signal conditioning circuit 10 and A/D collecting unit 12 respectively by control line.
Specific works process is:
In the magnetic field set stage: record local geomagnetic field intensity and direction by three-component geomagnetic field measuring circuit 17, according to detection direction, detection range and the direction, local terrestrial magnetic field measured and intensity, utilize notebook computer 3 to calculate and the direction and intensity of the first electromagnet 2 and the second electromagnet 14 is set.Then by the first solenoid driver circuit 1 and the second solenoid driver circuit 13, first electromagnet 2, second electromagnet 14 is driven, the artificial magnetic field utilizing electromagnet to produce and magnetic field acting in conjunction natively, thus in assigned direction, specific range, specific region, construct the magnetic field met required for nuclear magnetic resonance directional detection.
At launching phase: control large power supply 4 by notebook computer 3 and produce a certain magnitude of voltage, and the current controling signal of one group of alternation is produced by main control unit 8, and this signal is delivered to transmitting bridge driving 5, drive high-power transmitting bridge 6, the frequency of the time that this signal continues and signal self is controlled by notebook computer 3.In high-power transmitting bridge 6, resonant capacitance 7 and transmitting coil 16 connect and compose a series resonance system, the output voltage of large power supply 4 is carried in the two ends of transmitting coil 16 and resonant capacitance 7 by high-power transmitting bridge 6 as emitting voltage, drive the output signal of 5 as bridge road input signal transmitting bridge, control the alternating conductive state of each device for power switching in bridge road, just a powerful AC signal can be produced in transmitting coil 16, this current signal creates alternating magnetic field by transmitting coil 16, complete assigned direction, specific range, exciting of the water content of appointed area.Excitation pulse square is the product of transmitter current and launch time, can be changed the transmitter current size in transmitting coil 16, and then can change the size of excitation pulse square by the output voltage changing large power supply 4.Excite distance to depend on the size of excitation pulse square, excite scope to depend on the size of transmitting coil 16.
In the reception stage: according to nuclear magnetic resonance principle, after underground water is stimulated certain hour, remove exciting field suddenly, the Hydrogen Proton in underground water can produce a relaxation effect, show as the electric signal producing a decay in receiving coil 15.In emission process; high toggle switch 9 is in off-state; a protective effect is played to the receiving unit of system; after transmitting terminates; through delay after a while; main control unit 8 sends a control signal, and make high toggle switch 9 close, the ultra-weak electronic signal received in receiving coil 15 enters the signal conditioning circuit 10 of system by high toggle switch 9.Main control unit 8 is by producing Management Information Base, parameters in signalization modulate circuit 10, signal is by after signal conditioning circuit 10, the electromagnetic noise interference be aliasing in signal conditioning circuit 10 can by filtering to a certain degree, purer signal is delivered to amplifier circuit 11 by signal conditioning circuit 10, is amplified by signal.Faint NMR signal is amplified to the input requirements meeting A/D collecting unit 12 by amplifier circuit 11, the simulating signal that amplifier circuit 11 exports is converted to digital signal by A/D collecting unit 12, and deliver in notebook computer 3 and preserve, complete the reception to NMR signal.
Introduce the nuclear magnetic resonance directional detection method of artificial magnetic field, comprise the following steps:
A, survey select a measuring point, the laying plane being coil with the vertical plane of this measuring point in district, lay receiving coil 15 transmitting coil 16, in process of deployment, vertically need put by support to coil.
B, three-component geomagnetic field measuring circuit 17 is utilized to measure local terrestrial magnetic field direction and intensity, according to direction, local terrestrial magnetic field and the intensity of detection direction, detection range and measurement gained, calculated by notebook computer 3 and the direction and intensity of electromagnet 2 and electromagnet 14 is set, then driven by solenoid driver circuit 1 and solenoid driver circuit 13 pairs of electromagnet 2, electromagnet 14, the artificial magnetic field utilizing electromagnet to produce and magnetic field acting in conjunction natively, thus construct the magnetic field required for nuclear magnetic resonance directional detection.
C, notebook computer 3 control large power supply 4 by serial bus, by changing the size of its output voltage, change the size of the excitation current on transmitting coil 16, and what namely produce varying strength excites magnetic field.By exciting of varying strength magnetic field, complete the detection of the different far and near water body of range transmission coil.Main control unit 8 produces the frequency signal of 40ms, drives 5 to drive high-power transmitting bridge 6 by transmitting bridge.After transmitting bridge 6 is driven, the output voltage utilizing large power supply 4 to produce applies the transmitter current of 40ms to resonant capacitance 7 and transmitting coil 16, complete exciting front water content.When exciting, main control unit 8 controls high toggle switch 9, makes it be in off-state, protects signal receiving end.After exciting end, through the 90ms time, main control unit 8 controls high toggle switch 9 and closes, and the signal produced in receiving coil 15 is sent into signal conditioning circuit 10 by high toggle switch 9.Signal conditioning circuit 10 pairs of signals carry out filtering process, main control unit 8 passes through centre frequency and the bandwidth of control line control signal modulate circuit 10 median filter, filtering doping noise in the signal, relatively pure signal is sent into amplifier circuit 11, after amplifier circuit 11 amplifies faint signal, deliver to A/D collecting unit 12, the collection of main control unit 8 control A/D collecting unit 12 starts and the end time, A/D collecting unit 12 utilizes analog to digital converter to convert the simulating signal that amplifier circuit 11 exports to digital signal, and the data obtained after conversion are delivered to notebook computer 3, carry out display and the preservation of data.
The NMR signal of said extracted is carried out characteristic parameter extraction, obtain the parameters such as relaxation time, initial amplitude, frequency, the data recorded are carried out inversion procedure, and the water cut, the permeability hydrogeological parameter that calculate in assigned direction, specific range, specific region, for contingent gushing water, gush mud geologic hazard and to furnish a forecast foundation.
Claims (1)
1. introduce the detection method of the nuclear magnetic resonance directional detection device of artificial magnetic field for one kind, be connected through exporting adjustable large power supply (4) and high-power transmitting bridge (6) and transmitting coil (16)-hold by notebook computer (3), notebook computer (3) is through main control unit (8), transmitting bridge drives (5), high-power transmitting bridge (6) and resonant capacitance (7) and transmitting coil (16) another-hold and be connected, main control unit (8) is connected with signal conditioning circuit (10) and high toggle switch (9) respectively, main control unit (8) is connected with A/D collecting unit (12), notebook computer (3) is connected with the first electromagnet (2) through the first solenoid driver circuit (1), notebook computer (3) is through A/D collecting unit (12), amplifier circuit (11), signal conditioning circuit (10) is connected with receiving coil (15) with high toggle switch (9), notebook computer (3) is connected with the second electromagnet (14) through the second solenoid driver circuit (13), notebook computer (3) and three-component geomagnetic field measuring circuit (17) connect to form,
Main control unit (8) be by instruction processing unit respectively with communication module, the first timer, gather synchronous signal output end mouth, switching synchronization signals output port, the second timer, signal condition cell location signal output port, frequency generator, bridge circuit driver signal output port and the 3rd timer and be connected, first timer is connected with collection synchronous signal output end mouth, second timer is connected with switching synchronization signals output port, and frequency generator connects to form through bridge circuit driver signal output port and the 3rd timer; It is characterized in that, comprise the following steps:
A, survey district in select a sensing point, with the laying plane that the imaginary vertical surface of this sensing point is coil, lay receiving coil (15) and transmitting coil (16), on rear side of transmitting coil and receiving coil, place the first electromagnet (2) and the second electromagnet (14);
B, local terrestrial magnetic field direction and intensity is measured by three-component geomagnetic field measuring circuit (17), according to detection direction, detection range and direction, local terrestrial magnetic field and intensity, calculated by notebook computer (3) and the direction and intensity of the first electromagnet (2) and the second electromagnet (14) is set, then respectively the first electromagnet (2) and the second electromagnet (14) are driven by the first solenoid driver circuit (1) and the second solenoid driver circuit (13), the artificial magnetic field utilizing electromagnet to produce and magnetic field acting in conjunction natively, thus the magnetic field of constructing required for nuclear magnetic resonance directional detection,
C, notebook computer (3) control to export adjustable large power supply (4) by Serial Port Line, by changing the size of its output voltage, change the size of the excitation current on transmitting coil (16), what namely produce varying strength excites magnetic field, by exciting of varying strength magnetic field, realize the detection apart from the different far and near water body of transmitting coil;
D, main control unit (8) produce 40ms frequency signal, (5) are driven to drive high-power transmitting bridge (6) by transmitting bridge, after transmitting bridge (6) is driven, the output voltage utilizing large power supply (4) to produce applies 40ms transmitter current to resonant capacitance (7) and transmitting coil (16), realizes exciting front water body;
E, when exciting, main control unit (8) controls high toggle switch (9), it is made to be in off-state, signal receiving end is protected, after exciting end, through 90ms, main control unit (8) controls high toggle switch (9) and closes, and the signal produced in receiving coil (15) is sent into signal condition unit (10) by high toggle switch (9);
F, signal condition unit (10) carries out filtering process to signal, main control unit (8) is by the centre frequency of control line control signal conditioning unit (10) median filter and bandwidth, filtering doping noise in the signal, relatively pure signal is sent into amplifier circuit (11), after amplifier circuit (11) amplifies faint signal, deliver to A/D collecting unit (12), the collection of main control unit (8) control A/D collecting unit (12) starts and the end time, A/D collecting unit (12) utilizes analog to digital converter to convert the simulating signal that amplifier circuit (11) exports to digital signal, and the data obtained after conversion are delivered to notebook computer (3), carry out display and the preservation of data,
G, by step f display with preserve NMR signal carry out characteristic parameter extraction, obtain relaxation time, initial amplitude, frequency parameter, the data recorded are carried out inversion procedure, calculate on assigned direction, specific range, water cut, permeability hydrogeological parameter in specific region, for contingent gushing water, gush mud geologic hazard and to furnish a forecast foundation.
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| CN105863735B (en) * | 2016-06-10 | 2018-08-31 | 华北理工大学 | The underground location method that earth magnetism is combined with RFID radio frequencies |
| CN108037540B (en) * | 2017-12-08 | 2020-04-14 | 吉林大学 | Multi-node tunnel nuclear magnetic resonance detection device and method based on WIFI |
| CN111538096B (en) * | 2020-05-06 | 2021-10-01 | 吉林大学 | Nuclear magnetic resonance underground water stratification detection device and detection method |
| CN112859185B (en) * | 2021-04-08 | 2022-08-05 | 河南拉莫尔量子科技有限公司 | Non-invasive remote material detection device based on earth field nuclear magnetic resonance |
| CN113281700B (en) * | 2021-04-20 | 2023-10-31 | 宜宾学院 | Wireless electromagnetic positioning system and method |
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