CN105549098B - Underground whole-space nuclear magnetic resonance pre-polarizing detection device and detection method - Google Patents
Underground whole-space nuclear magnetic resonance pre-polarizing detection device and detection method Download PDFInfo
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- CN105549098B CN105549098B CN201510917125.5A CN201510917125A CN105549098B CN 105549098 B CN105549098 B CN 105549098B CN 201510917125 A CN201510917125 A CN 201510917125A CN 105549098 B CN105549098 B CN 105549098B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/14—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electron or nuclear magnetic resonance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
- G01V3/32—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with electron or nuclear magnetic resonance
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Abstract
The present invention relates to a kind of underground whole-space nuclear magnetic resonance pre-polarizing detection device and detection method, it is to be connected respectively through main control unit and the adjustable large power supply of output with transmitting bridge driving, high-power transmitting bridge, high toggle switch with pre-polarizing coil by computer, computer connects and composes through A/D collecting units, amplifier circuit, Q switch circuits and with humorous electric capacity and receiving coil.The prepolarizing field in natural earth's magnetic field is much larger than using magnetic field intensity, improves the Overall magnetization intensity of detection target water body, so as to obtain bigger NMR signal, solves the problem of the lower extraction NMR signal of very noisy interference.The direction in pre-polarizing magnetic field can change, and can realize directional detection.When being detected using the device to the disaster water body in the underground engineerings such as tunnel, mine, the detection of the water content size, water-bearing layer thickness at the disaster water source in the region to assigned direction, specific range can be realized, is reduced due to various accidents caused by the geological disasters such as gushing water.
Description
Technical field：
The present invention relates to one kind to utilize geophysical prospecting equipment and method, especially with nuclear magnetic resonance (Nuclear
Magnetic Resonance, NMR) Detection Techniques the underground whole-spaces such as mine tunnel carry out deep layer detection.
Background technology：
During underground construction, especially in the large-scale underground tunneling engineering such as tunnel, mine, because geological conditions is answered
It is miscellaneous, it is frequently encountered the gushing water as caused by underground water, gushes the geological hazards such as mud, influences construction speed, and give construction peace
Huge hidden danger is brought entirely.To above and below construction area, the water occurrence status in left and right and front carry out accurate, effective detection, into
For an important research direction in geophysical exploration method.
CN102053280A discloses a kind of nuclear magnetic resonance underground water detection system and detection method with reference coil.
Believed by noise in the NMR signal and reference coil in multi-channel A/D collecting units synchronous acquisition transmitting/receiving coil
Number all-wave graphic data, by calculate reference coil gather noise signal and NMR signal maximum correlation, realize
Reference coil optimum position and the laying of quantity, it is adaptive using variable step in the case where signal and noise statisticses are unknown
Algorithm is answered, offsets the noise in transmitting/receiving coil acquisition NMR signal to greatest extent.The usefulness of the invention is：
The extraction of the lower NMR signal of more Source noise interference is realized to a certain extent, efficiently solves residential block nuclear magnetic resonance
The problem of detection disturbs more, a variety of interference noise data to be difficult to separation, but equally it is faced with the reference coil cloth in small space
If difficult, using limited limitation.
CN102062877A discloses a kind of nuclear magnetic resonance detection device and detection method to front water body forward probe.
It is to be connected respectively with system controller, large power supply, signal gathering unit by serial bus by computer, system controller
It is connected through bridge circuit driver device, high-power H type transmitting bridge and with humorous electric capacity with transmitting coil, receiving coil is through protection switch, letter
Number conditioning unit, amplifier and signal gathering unit connected structure into.Using vertical runs coil modes, line is effectively reduced
The area occupied of circle, the device is set to deploy investigation and prospecting in narrow space.But foregoing invention to front water body
The nuclear magnetic resonance detection device and detection method of forward probe only have tens uT only with natural earth's magnetic field, its magnetic field intensity,
Relative weak, and earth magnetism field direction is immutable, and the front or rear of detection can not be accurately told using the device
Water content be present, i.e., can not realize the purpose of orientation forward probe.And because the magnetic field intensity in natural earth's magnetic field is faint, so
The important information parameters such as water-bearing layer thickness, the water content size of front water body can not accurately be obtained.
The nuclear magnetic resonance water detection device of foregoing invention is respectively provided with higher measurement essence for special needs and application scenario
Degree and good measurement effect, but all come with some shortcomings：In the complicated underground tunneling engineering of narrow space, environment, ground
Relatively effective method in nuclear magnetic resonance detection, similar multichannel reference coil noise-eliminating method are stranded because limited space faces realization
Difficult, coil turn can not enough receive useful signal etc. and adapt to the problem of poor to working environment；Simultaneously for tunnel, ore deposit
In nuclear magnetic resonance water detection device in the large-scale underground tunneling engineering such as well, although employing the mode that the small coil of multiturn receives,
Solve the problems, such as the laying of small space receiving coil, but NMR signal is still had in very noisy complexity underground engineering
The very little compared with strong background noise, i.e., the problem of signal to noise ratio is very low.
The content of the invention：
The purpose of the present invention is that for above-mentioned the deficiencies in the prior art, there is provided one kind is applied to narrow space, background
The complicated underground tunneling engineering of noise, the pre-polarizing in natural earth's magnetic field is far longer than using magnetic field intensity caused by pre-polarizing coil
Magnetic field, so as to improve the Overall magnetization intensity of water body, and then signal to noise ratio is improved, realized to disaster water source in underground tunneling engineering
Accurate measurement, be accurately positioned, reduce because of not clear the triggered gushing water of front geological condition, gush the geology calamity such as mud, collapse and cave-in
Harmful underground whole-space nuclear magnetic resonance pre-polarizing detection device.
The purpose of the present invention is achieved through the following technical solutions：
Underground whole-space nuclear magnetic resonance pre-polarizing detection device, it is through exporting adjustable large power supply 2, big by computer 1
Power emission bridge 4 is connected with one end of pre-polarizing coil 12, computer 1 through main control unit 6, transmitting bridge driving 3, it is high-power
Transmitting bridge 4 and high toggle switch 5 are connected with the other end of pre-polarizing coil 12, main control unit 6 respectively with transmitting bridge
Driving 3, high toggle switch 5, Q-switch circuits 8 and A/D collecting units 10 connect, computer 1 through A/D collecting units 10, put
Big device circuit 9, Q-switch circuits 8 and it is connected with humorous electric capacity 7 with receiving coil 11, pre-polarizing coil 12 connects with that can release circuit 13
Connect composition.
Underground whole-space nuclear magnetic resonance pre-polarizing detection method, comprises the following steps：
A, a sensing point is selected in survey area, the laying plane using the imaginary vertical surface of the sensing point as coil, laying connects
Take-up circle 11 and pre-polarizing coil 12；
B, computer 1 exports adjustable large power supply 2 by serial ports line traffic control, by changing the size of its output voltage,
To change the size of the excitation current on pre-polarizing coil 12, that is, the pre-polarizing magnetic field of varying strength is produced, by different strong
The polarization in magnetic field is spent, realizes the detection apart from the different far and near water bodys of pre-polarizing coil.
C, main control unit 6 produces the 7s prepolarizing field polarization times, and 3 pairs of high-power transmitting bridges are driven by transmitting bridge
4 are driven, and after transmitting bridge 4 is driven, main control unit 6 controls high toggle switch 5, is at closure state, profit
Output voltage applies electric current to pre-polarizing coil 12 caused by large power supply 2, realizes the polarization to front water body；
D, in polarization, main control unit 6 controls Q-switch circuits 8 and A/D collecting units 10, is at disconnecting
(not working) state, after end is excited, by 7s, main control unit 6 control transmitting bridge driving 3 make transmitting bridge 4 not by
Driving, terminate to apply voltage to pre-polarizing coil 12.
E, after the power supply to pre-polarizing coil 12 is terminated, the energy on pre-polarizing coil 12 oneself will not rapidly disappear,
The time can be released in 15ms come the rapid energy consumed on pre-polarizing coil 12, this section by the way that circuit 13 can be released, then main control
Unit 6 controls Q-switch circuits 8 to be carried out receiving coil 11 by ringing caused by the energy affect of pre-polarizing coil 12
Suppress；
F, amplifier circuit 9 is delivered to after being amplified to the signal by the suppressed ringing phenomenon of Q-switch circuits 8
A/D collecting units 10, the working time of the Q-switch circuits before A/D collections are started is 5ms, and main control unit 6 controls
The collection of A/D collecting units 10 starts and the end time, and Q-switch, A/D are not closed when controlling A/D collecting units 10 to gather
The time of collection is 3s, and the amplifier circuit H analog signals exported are converted into counting by A/D collecting units 10 using analog-digital converter
Word signal, and the data obtained after conversion are delivered into computer 1, the display of data is carried out, afterwards adopts Q-switch circuits and A/D
Collection unit all stops, and the stand-by period for continuing 4s into one section, this was a work period；
G, repeat step c-f, continuous superposition detection is carried out, shows the magnetic resonance signal that continuous superposition detection obtains, will obtain
The accurate data obtained preserves；
H, step g is shown and carries out characteristic parameter extraction with the NMR signal preserved, obtained the relaxation time, initially shake
Width, frequency parameter, the data measured are subjected to inversion procedure, calculate containing on assigned direction, in setpoint distance, setting regions
Water, permeability hydrogeological parameter, for may occur gushing water, gush mud geological disaster and furnish a forecast foundation.
Beneficial effect：Underground whole-space nuclear magnetic resonance pre-polarizing detection method disclosed by the invention is answered suitable for ambient noise
The total space geological environments such as miscellaneous changeable and uneven spatial distribution mine, tunnel.Pre-polarizing magnetic caused by pre-polarizing coil
The magnetic field intensity of field is much larger than tens uT geomagnetic field intensity, so as to strengthen the Overall magnetization intensity of detection water body, increases nuclear-magnetism
Resonance signal, and then signal to noise ratio is improved, therefore go for the environment that noise is strong and ambient noise is complicated and changeable, solve difficulty
The problem of NMR signal is extracted in the case of to be disturbed in very noisy.Magnetic field intensity caused by pre-polarizing coil becomes with distance
Change, produce a gradient magnetic, improve the resolution ratio of detection.The direction in pre-polarizing magnetic field can change, and can realize orientation
Detection.When being detected using the invention device to the water content in the underground engineerings such as tunnel, mine, not only can accurately, have
Detect whether water content be present to effect, and the water content size of water content, the thickness in water-bearing layer, and can realize to referring to
Determine direction, specific range region directional detection purpose, so as to relatively reliable, the accurate position for finding water content,
Solve water content is accurately positioned problem.The it is proposed of the present invention, solve and be difficult to extract nuclear-magnetism in the case where very noisy disturbs
The problem of resonance signal and water content are accurately positioned problem, have very big realistic meaning.
Brief description of the drawings：
Fig. 1 is the structured flowchart of underground whole-space nuclear magnetic resonance pre-polarizing detection device
Fig. 2 is the timing diagram of underground whole-space nuclear magnetic resonance pre-polarizing detection method
1 computer, the 2 adjustable large power supplies of output, the driving of 3 transmitting bridges, 4 high-power transmitting bridges, the switching of 5 high pressures are opened
Close, 6 main control units, 7 match somebody with somebody humorous electric capacity, 8Q-switch circuits, 9 amplifier circuits, 10A/D collecting units, 11 receiving coils,
12 pre-polarizing coils, 13 can release circuit.
Embodiment：
The present invention is described in further detail with reference to the accompanying drawings and examples：
Underground whole-space nuclear magnetic resonance pre-polarizing mode detection device, is to pass through serial bus and main control list by computer 1
Member 6 and the adjustable large power supply 2 of output are connected, and main control unit 6 is connected by control line with transmitting bridge driving 3, is launched
Bridge circuit driver 3 is connected by signal wire with high-power transmitting bridge 4, the output end of large power supply 2 by interactive signal line with
High-power transmitting bridge 4 is connected, and the output end of transmitting bridge 4 is connected by signal wire with high toggle switch 5, and high pressure switching is opened
Close 5 by signal wire with one end of pre-polarizing coil 12 to be connected, transmitting bridge 4 passes through signal wire and the other end of pre-polarizing coil 12
It is connected.Receiving coil 11 is connected by signal wire with one end of humorous electric capacity 7, the other end with humorous electric capacity 7 by signal wire with
The input of Q-switch circuits 8 is connected, and the output end of Q-switch circuits 8 passes through the input of signal wire and amplifier circuit 9
End is connected, and the output end of amplifier circuit 9 is connected by signal wire with the input of A/D collecting units 10, A/D collecting units 10
Output end be connected by data wire with computer 1.Main control unit 6 by control line respectively with high toggle switch 5, Q-
Switch circuits 8 and A/D collecting units 10 are connected.
Prepolarizing field first starts to polarize to detection target, and at this moment Q-switch circuits and A/D collecting units are all first
Do not work.Stop exciting prepolarizing field after the opening time of prepolarizing field crosses 7s, at this moment can release circuit and start to pre- pole
The energy for changing coil carries out rapid release time in 15ms, after releasing the time, opens Q-switch circuits, ring is showed
As being suppressed, start A/D collections after opening 5ms, be at this moment not turned off Q-switch, after A/D gathers 3s, by Q-switch electricity
Road and A/D collecting units all stop, and into after one section of lasting 4s stand-by period, are starting next cycle, the multiple cycle surveys
Overlapping display and preservation are carried out after amount.
Underground whole-space nuclear magnetic resonance pre-polarizing detection method, comprises the following steps：
A, a sensing point is selected in survey area, the laying plane using the imaginary vertical surface of the sensing point as coil, laying connects
Take-up circle 11 and pre-polarizing coil 12；
B, computer 1 exports adjustable large power supply 2 by serial ports line traffic control, by changing the size of its output voltage,
To change the size of the excitation current on pre-polarizing coil 12, that is, the pre-polarizing magnetic field of varying strength is produced, by different strong
The polarization in magnetic field is spent, realizes the detection apart from the different far and near water bodys of pre-polarizing coil.
C, main control unit 6 produces the 7s prepolarizing field polarization times, and 3 pairs of high-power transmitting bridges are driven by transmitting bridge
4 are driven, and after transmitting bridge 4 is driven, main control unit 6 controls high toggle switch 5, is at closure state, profit
Output voltage applies electric current to pre-polarizing coil 12 caused by large power supply 2, realizes the polarization to front water body；
D, in polarization, main control unit 6 controls Q-switch circuits 8 and A/D collecting units 10, is at disconnecting
(not working) state, after end is excited, by 7s, main control unit 6 control transmitting bridge driving 3 make transmitting bridge 4 not by
Driving, terminate to apply voltage to pre-polarizing coil 12.
E, after the power supply to pre-polarizing coil 12 is terminated, the energy on pre-polarizing coil 12 oneself will not rapidly disappear,
The time can be released in 15ms come the rapid energy consumed on pre-polarizing coil 12, this section by the way that circuit 13 can be released, then main control
Unit 6 controls Q-switch circuits 8 to be carried out receiving coil 11 by ringing caused by the energy affect of pre-polarizing coil 12
Suppress；
F, amplifier circuit 9 is delivered to after being amplified to the signal by the suppressed ringing phenomenon of Q-switch circuits 8
A/D collecting units 10, the working time of the Q-switch circuits before A/D collections are started is 5ms, and main control unit 6 controls
The collection of A/D collecting units 10 starts and the end time, and Q-switch, A/D are not closed when controlling A/D collecting units 10 to gather
The time of collection is 3s, and the amplifier circuit H analog signals exported are converted into counting by A/D collecting units 10 using analog-digital converter
Word signal, and the data obtained after conversion are delivered into computer 1, the display of data is carried out, afterwards adopts Q-switch circuits and A/D
Collection unit all stops, and the stand-by period for continuing 4s into one section, this was a work period；
G, repeat step c to f, multiple stacking detection is carried out until becoming for FID signal substantially can be found out in time domain
Gesture), it will repeatedly detect obtained magnetic resonance signal and be overlapped and show, obtain accurate information, data are preserved；
H, step g is shown and carries out characteristic parameter extraction with the NMR signal preserved, obtained the relaxation time, initially shake
Width, frequency parameter, the data measured are subjected to inversion procedure, calculate containing on assigned direction, in setpoint distance, setting regions
Water, permeability hydrogeological parameter, for may occur gushing water, gush mud geological disaster and furnish a forecast foundation.
Embodiment 1
Underground whole-space nuclear magnetic resonance pre-polarizing detection method is that one kind improves signal to noise ratio simultaneously using pre-polarizing mode
The method of directional detection, the water body that will first detect are far longer than natural earth's magnetic field using mT levels caused by pre-polarizing coil 12
Prepolarizing field polarized come the water body that will effectively detect, improve the overall intensity of magnetization of water body, that is, improving to detect
Nuclear magnetic signal.Then receive Hydrogen Proton energy level transition time low-lying level state in water body with receiving coil 11 and discharge big
The quantum of energy with Larmor frequency of amount, while ringing is suppressed with Q-switch circuits 8.Finally pass through A/D
The data that collecting unit 10 obtains after gathering are sent into computer 1 and are shown and stored.
Underground whole-space nuclear magnetic resonance pre-polarizing detection method, comprises the following steps：
A, a sensing point is selected in survey area, the laying plane using the imaginary vertical surface of the sensing point as coil, laying connects
Take-up circle 11 and pre-polarizing coil 12；
B, computer 1 exports adjustable large power supply 2 by serial ports line traffic control, by changing the size of its output voltage,
To change the size of the excitation current on pre-polarizing coil 12, that is, the pre-polarizing magnetic field of varying strength is produced, by different strong
The polarization in magnetic field is spent, realizes the detection apart from the different far and near water bodys of pre-polarizing coil.
C, main control unit 6 produces the 7s prepolarizing field polarization times, and 3 pairs of high-power transmitting bridges are driven by transmitting bridge
4 are driven, and after transmitting bridge 4 is driven, main control unit 6 controls high toggle switch 5, is at closure state, profit
Output voltage applies electric current to pre-polarizing coil 12 caused by large power supply 2, realizes the polarization to front water body；
D, in polarization, main control unit 6 controls Q-switch circuits 8 and A/D collecting units 10, is at disconnecting
(not working) state, after end is excited, by 7s, main control unit 6 control transmitting bridge driving 3 make transmitting bridge 4 not by
Driving, terminate to apply voltage to pre-polarizing coil 12.
E, after the power supply to pre-polarizing coil 12 is terminated, the energy on pre-polarizing coil 12 oneself will not rapidly disappear,
The time can be released in 15ms come the rapid energy consumed on pre-polarizing coil 12, this section by the way that circuit 13 can be released, then main control
Unit 6 controls Q-switch circuits 8 to be carried out receiving coil 11 by ringing caused by the energy affect of pre-polarizing coil 12
Suppress；
F, amplifier circuit 9 is delivered to after being amplified to the signal by the suppressed ringing phenomenon of Q-switch circuits 8
A/D collecting units 10, the working time of the Q-switch circuits before A/D collections are started is 5ms, and main control unit 6 controls
The collection of A/D collecting units 10 starts and the end time, and Q-switch, A/D are not closed when controlling A/D collecting units 10 to gather
The time of collection is 3s, and the amplifier circuit H analog signals exported are converted into counting by A/D collecting units 10 using analog-digital converter
Word signal, and the data obtained after conversion are delivered into computer 1, the display of data is carried out, afterwards adopts Q-switch circuits and A/D
Collection unit all stops, and the stand-by period for continuing 4s into one section, this was a work period；
G, repeat step c to f, 100 detections are carried out, 100 times is detected obtained magnetic resonance signal and be overlapped and show
Show, obtain accurate information, data are preserved；
H, step g is shown and carries out characteristic parameter extraction with the NMR signal preserved, obtained the relaxation time, initially shake
Width, frequency parameter, the data measured are subjected to inversion procedure, calculate containing on assigned direction, in setpoint distance, setting regions
Water, permeability hydrogeological parameter, for may occur gushing water, gush mud geological disaster and furnish a forecast foundation.
Claims (2)
1. a kind of underground whole-space nuclear magnetic resonance pre-polarizing detection device and detection method, it is characterised in that comprise the following steps:
A, a sensing point is selected in survey area, the laying plane using the imaginary vertical surface of the sensing point as coil, laying receives line
Enclose (11) and pre-polarizing coil (12)；
B, computer (1) exports adjustable large power supply (2) by serial ports line traffic control, by changing the size of its output voltage,
To change the size of the excitation current on pre-polarizing coil (12), that is, the pre-polarizing magnetic field of varying strength is produced, passes through difference
The polarization of intensity magnetic field, realize the detection apart from the different far and near water bodys of pre-polarizing coil；
C, main control unit (6) produces the 7s prepolarizing field polarization times, and (3) are driven to high-power transmitting bridge by transmitting bridge
(4) it is driven, after transmitting bridge (4) is driven, main control unit (6) controls high toggle switch (5), is at closing
State, apply electric current to pre-polarizing coil (12) using output voltage caused by large power supply (2), realize to front water body
Polarization；
D, in polarization, main control unit (6) control Q-switch circuits (8) and A/D collecting units (10), it is at disconnecting
State, after end is excited, by 7s, main control unit (6) control transmitting bridge driving (3) makes transmitting bridge (4) not driven
It is dynamic, terminate to apply voltage to pre-polarizing coil (12)；
E, after the power supply to pre-polarizing coil (12) is terminated, the energy on pre-polarizing coil (12) oneself will not rapidly disappear,
The time can be released in 15ms come the rapid energy consumed on pre-polarizing coil (12), this section by the way that circuit (13) can be released, Ran Houzhu
Control unit (6) control Q-switch circuits (8) are to receiving coil (11) by caused by pre-polarizing coil (12) energy affect
Ringing is suppressed；
F, amplifier circuit (9) is delivered to after being amplified to the signal by Q-switch circuits (8) suppressed ringing phenomenon
A/D collecting units (10), the working time of the Q-switch circuits before A/D collections are started is 5ms, main control unit (6)
The collection of control A/D collecting units (10) starts and the end time, and Q- is not closed when controlling A/D collecting units (10) collection
The time of switch, A/D collection is 3s, and A/D collecting units (10) utilize the simulation that analog-digital converter exports amplifier circuit H
Signal is converted into data signal, and the data obtained after conversion are delivered into computer (1), the display of data is carried out, afterwards by Q-
Switch circuits and A/D collecting units all stop, and the stand-by period for continuing 4s into one section, this was a work period；
G, repeat step c-f, continuous superposition detection is carried out, the magnetic resonance signal that continuous superposition detection obtains is shown, by acquisition
Accurate data preserves；
H, by step g show with preserve NMR signal carry out characteristic parameter extraction, obtain the relaxation time, initial amplitude,
Frequency parameter, the data measured are subjected to inversion procedure, calculated aqueous on assigned direction, in setpoint distance, setting regions
Amount, permeability hydrogeological parameter, for may occur gushing water, gush mud geological disaster and furnish a forecast foundation.
2. exist according to the underground whole-space nuclear magnetic resonance pre-polarizing detection device described in claim 1 and detection method, its feature
It is through exporting adjustable large power supply by computer (1) in, described underground whole-space nuclear magnetic resonance pre-polarizing detection device
(2) it is connected with high-power transmitting bridge (4) with one end of pre-polarizing coil (12), computer (1) is through main control unit (6), transmitting
Bridge circuit driver (3), high-power transmitting bridge (4) and high toggle switch (5) are connected with the other end of pre-polarizing coil (12), main
Control unit (6) is connected with transmitting bridge driving (3), high toggle switch (5) respectively, Q-switch circuits (8) and A/D are gathered
Unit (10) connects, and computer (1) is through A/D collecting units (10), amplifier circuit (9), Q-switch circuits (8) and with humorous electric capacity
(7) it is connected with receiving coil (11), pre-polarizing coil (12) connects and composes with that can release circuit (13).
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