CN102062877B - Nuclear magnetic resonance detection device and method for advanced detection of water bodies in front - Google Patents
Nuclear magnetic resonance detection device and method for advanced detection of water bodies in front Download PDFInfo
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Abstract
The invention relates to a nuclear magnetic resonance detection device and a nuclear magnetic resonance detection method for the advanced detection of a water bodies in the front. In the device, a computer is connected with a system controller, a high-power power supply and a signal acquisition unit by a serial port bus respectively; and the system controller is formed by connecting a bridge circuit driver, a high-power H-shaped transmitting bridge circuit, a resonant capacitor and a transmitting coil. Compared with the prior art, the device can detect important information such as the existence of water-bearing bodies in the front, the water content of the water-bearing bodies and the like accurately and effectively. The occupied area of the coil is reduced effectively by a mode of arranging the coil vertically, so that the device can perform exploration in narrow space. The device can detect the underground geological condition within a certain distance in the front directly and accurately in production fields of coal fields and mines or construction sites of tunnels so as to reduce mine accidents caused by geological disasters such as water burst, mud gushing and the like due to unclear geological conditions in the front or various incidents caused by the geological disasters in the process of tunnel construction.
Description
Technical field:
The present invention relates to a kind of geophysical prospecting equipment that utilizes nuclear magnetic resonance that water content is detected, especially the dead ahead water body is carried out the nuclear magnetic resonance sniffer and the detection method of forward probe with vertical coil.
Background technology:
In underground works, particularly in the large-scale underground excavation work such as tunnel, mine, because complicated geological condition, the gushing water that causes by underground water, gush geologic hazard such as mud and happen occasionally, brought huge disaster and inestimable economic loss to construction safety.How the water content to the place ahead in the underground engineering carries out accurate and effective detection, becomes a research direction in the geophysical exploration method.
CN201037869 discloses a kind of " passive lane/tunnel forward probe appearance ", is made up of two signal pickers of acquisition sensor and output end signal UNICOM and the signal data acquisition device that is used for acknowledge(ment) signal collector output end signal.Be the size of the natural electric magnetic wave value that radiates according to geologic body, magnitude of voltage be converted into the reflection coefficient of geologic body, combine known geological data again, explain variation, shatter belt, the minor fault occurrence of surveying the place ahead depth of stratum through matheematical equation.
CN101603423 discloses the DC electrical method method of bed-parallel advanced detection of water bearing " a kind of in coal mine roadway ": use mine direct current method seven electrode system sniffers; Arrange that near the coal mine roadway heading end 4 electrodes of A 1, A2, A3, A4 structures are arranged in a straight line; Another root transmitting electrode B with infinite distant place layout constitutes the loop respectively; To the underground direct current that infeeds, set up DC electric field, use electrode M, the N of 2 relative fixed distances to measure its electric field distribution law simultaneously at the rear, tunnel; After handling through special-purpose assorted interpretation technique, obtain the meet head on electrical distributed intelligence of the geologic body in the 0m～140m of the place ahead of digging laneway or tunnel.The forward probe device and method that foregoing invention designed has investigation depth far away; Detection efficiency and precision are also higher; But a common deficiency is arranged all; Being exactly that these devices all come whether water content existed and judge through reconnoitring water-bearing structure and layer position, is a kind of indirect measurement method, can not accurately obtain the important information parameters such as water-bearing zone thickness, water cut size of the place ahead water body.
CN01278229.7 discloses a kind of " nuclear magnetic resonance water table detection instrument ", comprises signal detector, it is characterized in that; One input end of this signal detector connects one first switch, the serial connection of the end in addition one speed change resistor of this first switch, second and the 3rd liang of switch of the serial connection of end in addition of this speed change resistor; The serial connection of end in addition one current-limiting resistance of second switch; And being serially connected with rectifier and generator in regular turn, the end in addition of this generator is connected with the other end of signal detector, wherein is connected to one first capacitor between this second and the 3rd liang of switch; The end in addition of this first capacitor is connected with the other end of signal detector; Be connected to a coil between this first switch and the speed change resistor, the end in addition of this coil is connected with the other end of signal detector, and a capacitor is arranged between the two ends of this signal detector.
CN1936621 discloses a kind of " nuclear magnetic resonance and transient electromagnetic combined instrument and method thereof ", is nuclear magnetic resonance and transient electromagnetic combined instrument and the method thereof that nuclear magnetic resonance and transient electromagnetic are combined into one.At first combined instrument is chosen under the transient electromagnetic mode of operation, on survey line, lays transmitting coil and receiving coil, measure surveying interior each measuring point in district; After measurement finishes; The transient electromagnetic data are carried out preliminary processing, find out the low-resistivity point, and the unusual measuring point of low-resistivity is demarcated; Again combined instrument is switched under the nuclear magnetic resonance mode of operation; And be that the center is laid transmitting coil and carried out Nuclear Magnetic Resonance Measurement work with the unusual measuring point of having demarcated; Compare to record the resistivity anomaly that data or figure and transient electromagnetic surveyed, in order to judge the true and false of the resistivity anomaly zone of interest that transient electromagnetic is surveyed.Foregoing invention only is applicable on the ground underground water body is surveyed, and still can't be applied in the underground works the place ahead water body is carried out forward probe.
Summary of the invention:
The object of the invention is exactly the deficiency to above-mentioned prior art, and a kind of nuclear magnetic resonance sniffer and detection method to the place ahead water body forward probe is provided.
The objective of the invention is to realize through following technical scheme:
Nuclear magnetic resonance sniffer to the place ahead water body forward probe; Be to link to each other with system controller 6, large power supply 7, signal gathering unit 2 respectively through serial bus by computing machine 1; System controller 6 through control line through bridge circuit driver 8, high-power H type emission bridge circuit 9 with join humorous electric capacity 10 and link to each other with transmitting coil 12; Large power supply 7 links to each other with transmitting coil 12 through high-power H type emission bridge circuit 9; System controller 6 links to each other with protection switch 5, signal condition unit 4 and signal gathering unit 2 respectively through control line, and collecting unit 2 links formation through amplifier 3, signal condition unit 4 and protection switch 5 and receiving coil 11.
System controller 6 is to be connected and composed with timer I, collection synchronous signal output end mouth, switch synchronous signal output end mouth, timer II, signal condition configuration of cells signal output port, frequency generator, bridge circuit drive signal output port, timer III, communication module respectively through control line by CPU.
Nuclear magnetic resonance detection method to the place ahead water body forward probe comprises following order and step:
A, in surveying the district, selecting a measuring point, is the laying plane of coil with the imaginary vertical surface of this measuring point, lays receiving coil 11 and transmitting coil 12;
B, computing machine 1 are through serial bus control large power supply 7; The output voltage of large power supply 7 is set; Through changing the size of output voltage, change the size of the excitation current on transmitting coil 12, the magnetic field that excites that promptly produces varying strength; Through exciting of varying strength magnetic field, realize apart from the detection of the different far and near water bodys of transmitting coil;
C, system controller 6 produce the 40ms frequency signal; Drive through 8 pairs of emissions of bridge circuit driver bridge circuit 9; After emission bridge circuit 9 was driven, the output voltage that utilizes large power supply 7 to produce applied the 40ms transmitter current to joining humorous electric capacity 10 and transmitting coil 12, realizes exciting the place ahead water body.
D, when exciting; System controller 6 control protection switches make it be in off-state, and signal receiving end is protected; After exciting end; Through 90-120ms, system controller 6 control protection switches are closed, and the signal that is produced in the receiving coil 11 is sent into the signal condition unit through protection switch;
E, signal condition unit carry out Filtering Processing to signal, and system controller 6 is through the centre frequency and the bandwidth of control line control signal conditioning unit 4 median filters, and filtering is entrained in the noise in the signal; Pure relatively signal is sent into amplifier 3; After 3 pairs of faint signals of amplifier amplify, deliver to signal gathering unit 2, the collection of system controller 6 control signal collecting units 2 begins and the concluding time; Signal gathering unit 2 utilizes analog to digital converter that the analog signal conversion of amplifier 3 outputs is become digital signal; Utilize serial bus, the data that obtain after the conversion are delivered to computing machine 1, carry out the preservation and the demonstration of data;
F, step e preserved with the NMR signal that shows carry out characteristic parameter extraction; Obtain relaxation time, initial amplitude, frequency parameter; The data that record are carried out inversion procedure; Estimate water yield, permeability hydrogeological parameter, for contingent gushing water, gush the mud ground matter disaster foundation that furnishes a forecast.
Beneficial effect: the present invention is according to the nuclear magnetic resonance detection principle; Adopt vertical coil; Water content to horizontal the place ahead carries out forward probe, is a kind of device and detection method of direct detection water content, for other indirect detection methods; Can whether have water content to the place ahead, and the important informations such as water cut size of water content are made accurate and effective detection.Adopt the vertical coil modes of laying; Effectively reduced the area occupied of coil; Make this device launch investigation and prospecting in the narrow space more; Be to ensure the construction safety of underground workss such as tunnel, mine, prevent because of gushing water that the place ahead water body causes, gush geologic hazard such as mud, a kind of effective forward probe is provided.Can be in mine production scene, coalfield or the constructing tunnel scene accurately verify out subsurface geology situation in the certain distance of the place ahead, reduce because of the not clear caused gushing water of front geological condition, gush the various accidents that cause because of geologic hazard in mine disaster that geologic hazard such as mud causes or the constructing tunnel.
Description of drawings:
Fig. 1 is the nuclear magnetic resonance sniffer structured flowchart to the place ahead water body forward probe.
Fig. 2 is the structured flowchart that attaches system controller 6 in the body 1.
1 computing machine, 2 signal gathering unit, 3 amplifiers, 4 signal condition unit, 5 protection switches, 6 system controllers, 7 large power supplies, 8 bridge circuit drivers, 9 high-power H types emission bridge circuit, 10 join humorous electric capacity, 11 receiving coils, 12 transmitting coils.
Embodiment:
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed description:
Nuclear magnetic resonance sniffer to the place ahead water body forward probe; Be to link to each other with system controller 6 and large power supply 7 through serial bus by computing machine 1; System controller 6 links to each other with bridge circuit driver 8 through control line; Bridge circuit driver 8 links to each other with emission bridge circuit 9 through signal wire, and the output terminal of large power supply links to each other with emission bridge circuit 9 through the interactive signal line, the output terminal of launching bridge circuit 9 through signal wire with join humorous electric capacity 10 and link to each other; Join humorous electric capacity 10 and link to each other with transmitting coil 12 through signal wire, emission bridge circuit 9 links to each other with transmitting coil 12 through signal wire.Receiving coil 11 links to each other with an end of protection switch 5 through signal wire; The other end of protection switch 5 links to each other with the input end of signal condition unit 4 through signal wire; The output terminal of signal condition unit 4 links to each other with the input end of amplifier 3 through signal wire; The output terminal of amplifier 3 links to each other with the input end of signal gathering unit 2 through signal wire, and the output terminal of signal gathering unit links to each other with computing machine 1 through serial bus.System controller 6 links to each other with protection switch 5, signal condition unit 4 and signal gathering unit 2 respectively through control line.The concrete course of work of this device is:
At launching phase: send a charging instruction by computing machine 1 and give large power supply 7; Comprise the magnitude of voltage that need be charged in the charging instruction; The magnitude of voltage that large power supply 7 is sent according to computing machine 1 requires to begin to utilize the inner DCDC module of power supply to charge for the storage capacitor in the power supply; When voltage in the storage capacitor of large power supply reach computing machine 1 level is set after, power supply stops charging, and gives computing machine 1 passback the instruction that voltage charging finishes.After computing machine 1 is received the instruction that charging that large power supply 7 is sent finishes; Computing machine 1 produces an instruction of permitting emission; After system controller 6 is received and is permitted firing order; Produce one group of signal with tested regional Larmor frequency same frequency, the time that signal continues and the frequency of signal self are by computing machine 1 control.System controller 6 is delivered to bridge circuit driver 8 with this group signal, after bridge circuit driver 8 amplifies this signal, delivers to high-power H type emission bridge circuit 9.In high-power H type bridge circuit 9; Transmitting coil 12 and to join that humorous electric capacity 10 regarded as be a series resonance system; The two ends that high-power H type emission bridge circuit 9 is carried in the output voltage of large power supply 7 transmitting coil 12 and joins humorous electric capacity 10 as emission voltage; As the bridge circuit input signal, the alternate conduction state of each device for power switching in the control bridge circuit has just produced the current signal of a high-voltage alternating in transmitting coil 12 with the output signal of bridge circuit driver 8; This current signal has produced alternating magnetic field through transmitting coil 12, has accomplished to excite phreatic.
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 the underground water can produce a relaxation effect, shows as the electric signal that in receiving coil 11, produces a decay.In emission process; Protection switch 5 is in off-state, and the receiving unit of system is played a protective effect, after emission finishes; Through delay after a while; System controller 6 sends a control signal, makes protection switch 5 closures, and the ultra-weak electronic signal that receives in the receiving coil 11 gets into the signal condition unit 4 of system through protection switch 5.System controller 6 is through producing Management Information Base; Each parameter in the signalization conditioning unit 4; Signal is through behind the signal condition unit 4; The electromagnetic noise interference that is aliasing in the signal condition unit 4 can be by filtering to a certain degree, and amplifier 3 is delivered to purer signal in signal condition unit 4, and signal is amplified.Amplifier 3 is amplified to faint NMR signal the input requirement that meets signal gathering unit 2; Signal gathering unit 2 is a digital signal with the analog signal conversion of amplifier output; And deliver in the computing machine 1 and preserve, accomplish reception to NMR signal.
Utilize the nuclear magnetic resonance detection method of vertical coil, comprise following order and step the place ahead water body forward probe:
In surveying the district, selecting a measuring point, is the laying plane of coil with the vertical plane of this measuring point, lays receiving coil 11 and transmitting coil 12; In process of deployment, need coil vertically to be put by support.
Computing machine 1 is provided with the output voltage of large power supply 7 through serial bus control large power supply 7.Through changing the size of output voltage, change the size of the excitation current on transmitting coil 12, the magnetic field that excites that promptly produces varying strength.Through exciting of varying strength magnetic field, accomplish the detection of the different far and near water bodys of range transmission coil.System controller 6 produces the frequency signal of 40ms, drives through 8 pairs of emissions of bridge circuit driver bridge circuit 9.After emission bridge circuit 9 is driven, utilize output voltage that large power supply 7 produces to apply the transmitter current of 40ms, accomplish exciting the place ahead water body to joining humorous electric capacity 10 and transmitting coil 12.When exciting, system controller 6 control protection switches make it be in off-state, and signal receiving end is protected.After exciting end, through the 100ms time, system controller 6 control protection switches are closed, and the signal that is produced in the receiving coil 11 is sent into the signal condition unit through protection switch.The signal condition unit carries out Filtering Processing to signal, and system controller 6 is through the centre frequency and the bandwidth of control line control signal conditioning unit 4 median filters, and filtering is entrained in the noise in the signal; Pure relatively signal is sent into amplifier 3; After 3 pairs of faint signals of amplifier amplify, deliver to signal gathering unit 2, the collection of system controller 6 control signal collecting units 2 begins and the concluding time; Signal gathering unit 2 utilizes analog to digital converter that the analog signal conversion of amplifier 3 outputs is become digital signal; Utilize serial bus, say that the data that obtain after the conversion deliver to host computer 1, carry out the preservation and the demonstration of data.
The NMR signal of said extracted is carried out characteristic parameter extraction; Obtain parameters such as relaxation time, initial amplitude, frequency; The data that record are carried out inversion procedure; And estimate hydrogeological parameters such as water yield, permeability, for contingent gushing water, gush geologic hazards such as the mud foundation that furnishes a forecast.
Claims (1)
1. nuclear magnetic resonance detection method to the place ahead water body forward probe; Said method adopts the nuclear magnetic resonance sniffer to the place ahead water body forward probe; Said device is characterized in that; Computing machine (1) links to each other with system controller (6), large power supply (7), signal gathering unit (2) respectively through serial bus; System controller (6) through control line through bridge circuit driver (8), high-power H type emission bridge circuit (9) with join humorous electric capacity (10) and link to each other with transmitting coil (12); Large power supply (7) links to each other with transmitting coil (12) through high-power H type emission bridge circuit (9), and system controller (6) links to each other with protection switch (5), signal condition unit (4) and signal gathering unit (2) respectively through control line, and signal gathering unit (2) is connected with receiving coil (11) through amplifier (3), signal condition unit (4) and protection switch (5);
Described system controller (6) is to be connected and composed with timer I, collection synchronous signal output end mouth, switch synchronous signal output end mouth, timer II, signal condition configuration of cells signal output port, frequency generator, bridge circuit drive signal output port, timer III, communication module respectively through control line by CPU;
Said method comprising the steps of:
A, in surveying the district, selecting a measuring point, is the laying plane of coil with the imaginary vertical surface of this measuring point, lays receiving coil (11) and transmitting coil (12);
B, computing machine (1) are through serial bus control large power supply (7); The output voltage of large power supply (7) is set; Through changing the size of output voltage, change the size of the excitation current on transmitting coil (12), the magnetic field that excites that promptly produces varying strength; Through exciting of varying strength magnetic field, realize apart from the detection of the different far and near water bodys of transmitting coil;
C, system controller (6) produce the 40ms frequency signal; Through bridge circuit driver (8) high-power H type emission bridge circuit (9) is driven; After high-power H type emission bridge circuit (9) is driven; Utilize output voltage that large power supply (7) produces to joining humorous electric capacity (10) and transmitting coil (12) applies the 40ms transmitter current, realize exciting the place ahead water body;
D, when exciting; System controller (6) control protection switch makes it be in off-state, and signal receiving end is protected; After exciting end; Through 90-120ms, system controller (6) control protection switch is closed, and the signal that is produced in the receiving coil (11) is sent into the signal condition unit through protection switch;
E, signal condition unit carry out Filtering Processing to signal, and system controller (6) is through the centre frequency and the bandwidth of control line control signal conditioning unit (4) median filter, and filtering is entrained in the noise in the signal; Pure relatively signal is sent into amplifier (3); Amplifier (3) is delivered to signal gathering unit (2) after faint signal is amplified, and the collection of system controller (6) control signal collecting unit (2) begins and the concluding time; Signal gathering unit (2) utilizes analog to digital converter that the analog signal conversion of amplifier (3) output is become digital signal; Utilize serial bus, the data that obtain after the conversion are delivered to computing machine (1), carry out the preservation and the demonstration of data;
F, step e preserved with the NMR signal that shows carry out characteristic parameter extraction; Obtain relaxation time, initial amplitude and frequency parameter; The data that record are carried out inversion procedure; Estimate water yield, permeability hydrogeological parameter, for contingent gushing water, gush the mud ground matter disaster foundation that furnishes a forecast.
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