CN102053280A - Nuclear magnetic resonance ground water detection system with reference coils and detection method - Google Patents
Nuclear magnetic resonance ground water detection system with reference coils and detection method Download PDFInfo
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- CN102053280A CN102053280A CN2010105374652A CN201010537465A CN102053280A CN 102053280 A CN102053280 A CN 102053280A CN 2010105374652 A CN2010105374652 A CN 2010105374652A CN 201010537465 A CN201010537465 A CN 201010537465A CN 102053280 A CN102053280 A CN 102053280A
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Abstract
The invention relates to a nuclear magnetic resonance ground water detection system with reference coils and a detection method. All-waveform data of nuclear magnetic resonance signals in a transmitting/receiving coil and noise signals in the reference coils are synchronously acquired through a plurality of paths of A/D acquiring units; the distribution of optimal positions and quantity of the reference coils is realized through calculating the maximum correlation of the noise signals and the nuclear magnetic resonance signals, which are acquired by the reference coils; and under the condition of unknown signal and noise statistical properties, noise in the nuclear magnetic resonance signals obtained by the transmitting/receiving coil is maximally offset by adopting a variable step adaptive algorithm, the nuclear magnetic resonance signals are extracted under the interference of multi-field source complex strong noise, thus the problems of multiple interferences of nuclear magnetic resonance detection near villages and in neighboring regions of cities and difficulty of separating multiple kinds of interference noise data are effectively solved, the interference resistance of instruments is improved, and a reliable detection device and method are provided for searching underground water near villages and in neighboring regions of cities.
Description
Technical field
The present invention relates to a kind of phreatic nuclear magnetic resonance detection system that is used to seek, especially have the nuclear magnetic resonance underground water detection system and the detection method of reference coil.
Background technology
Nuclear magnetic resonance (Nuclear Magnetic Resonance, abbreviation NMR) the underground water detection method is a kind of phreatic geophysical method of directly reconnoitring, compare with the phreatic method of traditional geophysical exploration have high resolution, the abundant advantage such as uniqueness of conciliating of high-level efficiency, quantity of information, the degree of depth, thickness, water percentage, the water-bearing zone average pore of not drilling and just can determine the water-bearing zone, and the expense of finishing a nuclear magnetic resonance depth measurement point only is 1/10 of a hydrogeological exploration boring expense.
But, in NMR underground water detection method, detected object is underground nuclear spin magnetic moment, and its electromagnetic field that produces on ground is very small, causes the instrument receiving trap need have the extraction that the ability that detects atomic weak signal (nV level) could realize the nuclear magnetic resonance detectable signal.Yet highly sensitive receiving trap very easily is subjected to the interference of electromagnetic noise.In China, the electrical network coverage rate has reached 96.4% at present, because geographical conditions limit not the frame electrical network, electrical network has spreaded all over all parts of the country except that remote areas such as Tibet.So near the village and the surrounding city area, because power line noise (50Hz and harmonic wave thereof) and accidental unusual noise effect are very serious, the application of NMR underground water detection method is restricted.When particularly Larmor frequency was very near the harmonic wave frequency of industrial frequency noise, NMR visited the water instrument and is difficult to even can not obtains reliable NMR signal.
The nmr phenomena that US6177794 discloses a kind of to utilize macro manifestations to go out is sought the new technology of the underground liquid mineral products that have nmr phenomena, use one group of controlled receiving antenna array and receiving antenna in the well of phase place to measure the underground liquid that has nmr phenomena more accurately, this method is utilized on the ground and underground coil combination while received signal, be used for NMR signal is well received, can realize underground oil, the detection of mineral resources such as water.CN01278229.7 discloses a kind of nuclear magnetic resonance water table detection instrument, comprise signal detector, it is characterized in that, one input end of this signal detector connects one first switch, number end serial connection 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 be 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 be 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.This invention is applied to the method for nuclear magnetic resonance in the detection of water table, has designed to be applicable to and to seek phreatic nuclear magnetic resonance detection instrument more than 500 meters.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; Combined instrument is switched under the nuclear magnetic resonance mode of operation again, 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.Function with two kinds of instruments of a set of equipment realization has reduced equipment investment, has brought into play two kinds of instruments advantage separately, has improved detection efficiency and precision.CN101285895 discloses a kind of " linear current source excitated multi-path receiving ground magnetic nuclear resonance method and system ", may further comprise the steps: 1) utilize transmitter by two emitting electrodes of being driven underground to the underground exchange current that infeeds your frequency of Rameau, the distance by changing electrode and the size of electric current produce the different magnetic field that excites; 2) disconnect exciting field, screw in the normal equilibrium attitude process, be the signal of exponential damping law with highly sensitive probe group of received at the hydrogen proton that is excited; 3) send described signal to receiver by signal transmssion line, the signal that described receiver is received sends to signal Processing and imaging system again, carries out the processing such as pre-service, denoising, inverting and imaging of signal.This invention can provide the meticulous prospecting of underground small size; Multiple tracks receives high efficiency, and the space exploration scope is big, helps characteristics such as 3-d inversion imaging; The line power supply excites, and construction is simple flexibly; Multiple tracks receives high efficiency, realizes surveying purpose by changing transmitter current.US7466128B2 discloses a kind of hyperchannel nuclear magnetic resonance harvester and disposal route, is used to be implemented in the three-dimensional NMR imaging of static magnetic field, is not controlled by to use the static magnetic field gradient.The application of recommending is accurate detection and the location of descending water with the terrestrial magnetic field over the ground.Multi-thread coil array all can be operated in the pattern of transmitting and receiving, and corresponding data processing algorithm is applied to and produces 3 dimension nuclear magnetic resonance spin data.For handling this multi-thread number of turns, adopt at least 2 emissions and receiving coil image data according to estimating 3 dimension nuclear magnetic resonance spin Density Distribution.CN101251606 discloses " the interior industrial frequency harmonic codan of useful signal frequency band in a kind of Testing of Feeble Signals instrument ", is to utilize frequency, phase place, amplitude to follow the tracks of the compensating circuit that the interior industrial frequency harmonic of useful signal frequency band causes interference comprehensively.Be the connecting and disconnecting of master microprocessor control signal sensor and impedance matching network, impedance matching network is connected with programmable amplifier through prime amplifier, broadband filter, the output signal envelope detecting device by control line and data bus be connected from microprocessor, programmable amplifier connects the DDS signal generator through phaselocked loop.Suppress the interference of the industrial frequency harmonic in the useful signal frequency band in the detecting instrument effectively, follow the tracks of frequency, phase place and the amplitude of this interference in real time, with its filtering from received signal, and do not influence other useful signal, do not influence the useful signal frequency content overlapping with this interfering frequency.The nuclear magnetic resonance water detection appratus device of foregoing invention and the prior art major part in the method are to adopt nuclear magnetic resonance technique to realize phreatic accurate detection and employing much channel communication are used to improve instrument work efficiency, detection accuracy and realize 3 dimension nuclear magnetic resonance inversion imagings, but then do not relate to for nuclear magnetic resonance underground water detection system and method under the strong jamming of many field sources of complexity; The industrial frequency harmonic codan of invention then can only solve the filtering of the some industrial frequency harmonics in the useful signal frequency band, and is then powerless for electromagnetic interference (EMI) such as other industrial frequency harmonics and unusual noises.
Summary of the invention
Purpose of the present invention is exactly at above-mentioned the deficiencies in the prior art, a kind of nuclear magnetic resonance underground water detection system and detection method that has reference coil is provided, with solve near the village and under the surrounding city complicated many field sources strong jamming in area NMR signal effectively extract a difficult problem.
The objective of the invention is to be achieved through the following technical solutions:
Computing machine 1 is connected with control system 2 by Serial Port Line, computing machine 1 is connected with emission power 3 by control line, control system 2 drives 4 by signal wire and emission control and is connected, emission control drives 4 and is connected with emission/receiving coil 9 through high-power H bridge circuit 7 by signal wire, control system 2 is connected with reception control module 5 by control line, receiving control module 5 is connected with multi-channel A/D collecting unit 16 by control line, multi-channel A/D collecting unit 16 is connected with computing machine 1 by data line, control system 2 is by control line and transceiver toggle switch 6, first change-over switch 13, second change-over switch 18 ... and even N change-over switch 22 connects, emission power 3 is connected with high-power H bridge circuit 7 by the interactive signal line, H bridge circuit 7 output terminals with join humorous electric capacity 8 and be connected with emission/receiving coil 9, emission/receiving coil 9 is by signal wire and transceiver toggle switch 6, signal conditioning circuit 10, signal amplifier 11 is connected with multi-channel A/D collecting unit 16, first reference coil 12 is through first change-over switch 13, first modulate circuit 14, first amplifier 15 is connected with multi-channel A/D collecting unit 16, second reference coil 17 is through second change-over switch 18, second modulate circuit 19, second amplifier 20 is connected with multi-channel A/D collecting unit 16, and N reference coil 21 is through N change-over switch 22, N modulate circuit 23, N amplifier 24 connects and composes with multi-channel A/D collecting unit 16.
Have the detection method of the nuclear magnetic resonance underground water detection system of reference coil, comprise following order and step:
A, in surveying the district, select the detection place, with the sensing point is the center, lay square emission/receiving coil 9, determine to lay at least one reference coil and even N reference coil according near the electromagnetic interference source situation sensing point, reference coil wants as close as possible interference source to lay, at least be greater than the length of side of square emission/receiving coil 9 with the distance on emission/receiving coil 9 wire frame borders, what guarantee the reference coil collection with this is noise rather than NMR signal;
B, unlatching have the nuclear magnetic resonance underground water detection system of reference coil, emission control drives in the 4 control high-power H bridge road direction emission/receiving coils 9 and infeeds the exchange current that frequency is a Larmor frequency, size by the output of computing machine 1 control break emission power 3 voltages, change the size of H bridge circuit output current in emission/receiving coil 9, promptly change the size of excitation pulse square, thereby excite the water body of underground different depth;
C, control system 2 controls disconnect exciting fields, control transceiver toggle switch 6, first change-over switch 13, second change-over switch 18 and even N change-over switch 22 will launch synchronously/receiving coil 9 in NMR signal and first reference coil 12, second reference coil 17 and the N reference coil 21 the all-wave graphic data of noise signal by multi-channel A/D collecting unit 16 collections;
D, NMR signal and noise signal all-wave graphic data that multi-channel A/D collecting unit 16 is gathered are uploaded to computing machine 1, calculate the maximum correlation of the noise signal and the NMR signal that emission/receiving coil 9 is gathered of reference coil collection, optimum value is more than 0.7, if calculated value is worth less than this, then lay the position and the quantity of reference coil again, repeating step b and step c;
E, based on the adaptive noise cancellation principle, adopt the adaptive noise cancellation system have one or N reference coil, variable-step self-adaptive lowest mean square (LMS) algorithm carries out noise cancellation, effective extraction of realization NMR signal;
F, the nuclear magnetic resonance all-wave shape signal of said extracted is carried out characteristic parameter extraction, obtain initial amplitude, relaxation time, phase place, frequency information;
G, carry out FORWARD AND INVERSE PROBLEMS according to the initial amplitude, relaxation time, phase place, the frequency information that obtain and handle, estimate groundwater reserve and permeability.
Beneficial effect: adopt the collection of reference coil realization near the multiple interference noise data sensing point, under signal and noise statistics condition of unknown, adopt the variable-step self-adaptive algorithm, noise in the adaptive tracing study reference coil, offset noise in emission/receiving coil to greatest extent based on relevant principle of cancellation, realize that the complicated very noisy of many field sources disturbs the extraction of NMR signal down, improved the instrument interference free performance, solved near the village effectively and the regional nuclear magnetic resonance of surrounding city survey disturb many, the problem that multiple interference noise data are difficult to separate, near the village and surrounding city area seek underground water a kind of reliable sniffer and method be provided.
Description of drawings
Fig. 1 is the nuclear magnetic resonance underground water detection system structured flowchart that has reference coil.
Fig. 2 is the nuclear magnetic resonance underground water detection system signal adaptive noise cancellation system chart that has reference coil.
1 computing machine, 2 control system, 3 emission powers, 4 emission control drive, and 5 receive control module, 6 transceiver toggle switch, 7 high-power H bridge circuits, 8 join humorous electric capacity, 9 emission/receiving coils, 10 signal conditioning circuits, 11 signal amplifiers, 12 first reference coils, 13 first change-over switches, 14 first modulate circuits, 15 first amplifiers, 16 multi-channel A/D collecting unit, 17 second reference coils, 18 second change-over switches, 19 second modulate circuits, 20 second amplifiers, 21 N reference coils, 22 N change-over switches, 23 N modulate circuits, 24 N amplifiers
Embodiment
Be described in further detail below in conjunction with drawings and Examples:
The nuclear magnetic resonance underground water detection system that has reference coil is to be connected with control system 2 by Serial Port Line by computing machine 1, computing machine 1 is connected with emission power 3 by control line, control system 2 drives 4 by signal wire and emission control and is connected, emission control drives 4 and is connected with emission/receiving coil 9 through high-power H bridge circuit 7 by signal wire, control system 2 is connected with reception control module 5 by control line, receiving control module 5 is connected with multi-channel A/D collecting unit 16 by control line, multi-channel A/D collecting unit 16 is connected with computing machine 1 by data line, control system 2 is by control line and transceiver toggle switch 6, first change-over switch 13, second change-over switch 18 ... and even N change-over switch 22 connects, emission power 3 is connected with high-power H bridge circuit 7 by the interactive signal line, H bridge circuit 7 output terminals with join humorous electric capacity 8 and be connected with emission/receiving coil 9, emission/receiving coil 9 is by signal wire and transceiver toggle switch 6, signal conditioning circuit 10, signal amplifier 11 is connected with multi-channel A/D collecting unit 16, first reference coil 12 is through first change-over switch 13, first modulate circuit 14, first amplifier 15 is connected with multi-channel A/D collecting unit 16, second reference coil 17 is through second change-over switch 18, second modulate circuit 19, second amplifier 20 is connected with multi-channel A/D collecting unit 16, and N reference coil 21 is through N change-over switch 22, N modulate circuit 23, N amplifier 24 connects and composes with multi-channel A/D collecting unit 16.
The concrete course of work is:
At launching phase: computing machine 1 control emission power 3 produces a certain numerical value voltage, and by control system 2, the control emission control drives 4, make it to drive high-power H bridge circuit 7, two output terminals of high-power H bridge circuit 7 with join humorous electric capacity 8 and emission/receiving coil 9 connects and composes series resonant tank, make the exchange current that generation has a certain Larmor frequency in the coil, excite the hydrogen proton in the underground water in the underground a certain degree of depth and the scope.Excite the degree of depth to depend on the size of excitation pulse square, i.e. size of current in the emission/receiving coil.Excite scope to depend on the size of emission/receiving coil 9.Transceiver toggle switch 6 adopts the high pressure dry-reed relay, at launching phase relay is disconnected, and emission/receiving coil 9 is not linked to each other with receiving system, and first change-over switch 13, second change-over switch 18 and even N change-over switch all place off-state.
In the reception stage: the control system 2 synchro control transceiver toggle switch 6 and first change-over switch 13, second change-over switch 18 and even the N change-over switch 22 make the NMR signal in multi-channel A/D collecting unit 16 synchronous acquisition emission/receiving coils 9 and first reference coil 12, second reference coil 17 ... noise signal in the N reference coil 21.Frequency range 1.3-2.6KHz and spectrum signature in view of tested NMR signal, signal and faint in addition, signal conditioning circuit 10, signal amplifier 11 are used, first reference coil 12, second reference coil 17 ... the noise data that N reference coil 21 is gathered has also adopted first modulate circuit 14, second modulate circuit 19 ... N modulate circuit 23, first amplifier 15, second amplifier 20 ... N amplifier 24 is sent to multi-channel A/D collecting unit 16.
The nuclear magnetic resonance underground water detection method that has reference coil, concrete implementation step comprises:
A, in surveying the district, select the detection place, with the sensing point is the center, lay square emission/receiving coil 9, determine to lay at least one reference coil and even N reference coil according near the electromagnetic interference source situation sensing point, reference coil wants as close as possible interference source to lay, at least be greater than the length of side of square emission/receiving coil 9 with the distance on emission/receiving coil 9 wire frame borders, what guarantee the reference coil collection with this is noise rather than NMR signal;
B, unlatching have the nuclear magnetic resonance underground water detection system of reference coil, emission control drives in the 4 control high-power H bridge road direction emission/receiving coils 9 and infeeds the exchange current that frequency is a Larmor frequency, size by the output of computing machine 1 control break emission power 3 voltages, change the size of H bridge circuit output current in emission/receiving coil 9, promptly change the size of excitation pulse square, thereby excite the water body of underground different depth;
C, control system 2 controls disconnect exciting fields, control transceiver toggle switch 6, first change-over switch 13, second change-over switch 18 and even N change-over switch 22 will launch synchronously/receiving coil 9 in NMR signal and first reference coil 12, second reference coil 17 and the N reference coil 21 the all-wave graphic data of noise signal by multi-channel A/D collecting unit 16 collections;
D, NMR signal and noise signal all-wave graphic data that multi-channel A/D collecting unit 16 is gathered are uploaded to computing machine 1, calculate the maximum correlation of the noise signal and the NMR signal that emission/receiving coil 9 is gathered of reference coil collection, optimum value is more than 0.7, if calculated value is worth less than this, then lay the position and the quantity of reference coil again, repeating step b and step c;
E, based on the adaptive noise cancellation principle, adopt the adaptive noise cancellation system have one or N reference coil, variable-step self-adaptive LMS algorithm carries out noise cancellation, effective extraction of realization NMR signal;
F, the nuclear magnetic resonance all-wave shape signal of said extracted is carried out characteristic parameter extraction, obtain initial amplitude, relaxation time, phase place, frequency information;
G, carry out FORWARD AND INVERSE PROBLEMS according to the initial amplitude, relaxation time, phase place, the frequency information that obtain and handle, estimate groundwater reserve and permeability.
In conjunction with the accompanying drawings 2, the present invention designs many reference coils mode and realizes effective extraction to the NMR signal that collects.Common in NMR signal mainly is that industrial frequency harmonic disturbs and unusual noise to the bigger noise of effect of signals, its mathematical model expression-form all can be directly or indirection table be shown as cosine and sine signal, based on these characteristics, adopt 90 ° of phase shift systems to be equivalent to design a plurality of adaptive notch filters and carry out adaptive noise and offset.90 ° of phase shift systems are realized by the Hilbert conversion.
The iterative formula of the variable-step self-adaptive LMS algorithm that is adopted:
z
k(n)＝W
k1(n)v
k(n)+W
k2(n)v
k⊥(n)
e(n)＝s(n)+v(n)-[z
1(n)+...+z
N(n)]
W
k1(n+1)＝W
k1(n)+2μ(n)e(n)v
k(n)
W
k2(n+1)＝W
k2(n)+2μ(n)e(n)v
k⊥(n)
(k＝1...N)
Wherein, v
k(n) and v
K ⊥(n) represent noise data that k reference coil collect and through the noise data after 90 ° of phase shifts.μ (n) represents variable step, and it depends on the signal to noise ratio (S/N ratio) of open-air measuring point, and when tested regional signal to noise ratio (S/N ratio) was low, it is big that μ (n) value is wanted, so that tracking noise as early as possible, on the contrary, when tested regional signal to noise ratio (S/N ratio) was higher, μ (n) value was smaller.
Embodiment 1
The nuclear magnetic resonance underground water detection system that has reference coil is to be connected with control system 2 by Serial Port Line by computing machine 1, computing machine 1 is connected with emission power 3 by control line, control system 2 drives 4 by signal wire and emission control and is connected, emission control drives 4 and is connected with emission/receiving coil 9 through high-power H bridge circuit 7 by signal wire, control system 2 is connected with reception control module 5 by control line, receiving control module 5 is connected with multi-channel A/D collecting unit 16 by control line, multi-channel A/D collecting unit 16 is connected with computing machine 1 by data line, control system 2 is by control line and transceiver toggle switch 6, first change-over switch 13 connects, emission power 3 is connected with high-power H bridge circuit 7 by the interactive signal line, H bridge circuit 7 output terminals with join humorous electric capacity 8 and be connected with emission/receiving coil 9, emission/receiving coil 9 is by signal wire and transceiver toggle switch 6, signal conditioning circuit 10, signal amplifier 11 is connected with multi-channel A/D collecting unit 16, and first reference coil 12 is through first change-over switch 13, first modulate circuit 14, first amplifier 15 connects and composes with multi-channel A/D collecting unit 16.
The nuclear magnetic resonance underground water detection method that has reference coil, concrete implementation step comprises:
A, in surveying the district, select the detection place, with the sensing point is the center, lay square emission/receiving coil 9, determine to lay a reference coil according near the electromagnetic interference source situation sensing point, reference coil wants as close as possible interference source to lay, at least be greater than the length of side of square emission/receiving coil 9 with the distance on emission/receiving coil 9 wire frame borders, what guarantee the reference coil collection with this is noise rather than NMR signal;
B, unlatching have the nuclear magnetic resonance underground water detection system of reference coil, emission control drives in the 4 control high-power H bridge road direction emission/receiving coils 9 and infeeds the exchange current that frequency is a Larmor frequency, size by the output of computing machine 1 control break emission power 3 voltages, change the size of H bridge circuit output current in emission/receiving coil 9, promptly change the size of excitation pulse square, thereby excite the water body of underground different depth;
C, control system 2 controls disconnect exciting fields, control transceiver toggle switch 6, first change-over switch 13 will launch synchronously/receiving coil 9 in NMR signal and first reference coil 12 the all-wave graphic data of noise signal by multi-channel A/D collecting unit 16 collections;
D, NMR signal and noise signal all-wave graphic data that multi-channel A/D collecting unit 16 is gathered are uploaded to computing machine 1, calculate the maximum correlation of the noise signal and the NMR signal that emission/receiving coil 9 is gathered of reference coil collection, optimum value is more than 0.7, if calculated value is worth less than this, then lay the position of reference coil again, repeating step b and step c;
E, based on the adaptive noise cancellation principle, adopt the adaptive noise cancellation system have a reference coil, variable-step self-adaptive LMS algorithm carries out noise cancellation, realizes effective extraction of NMR signal;
F, the nuclear magnetic resonance all-wave shape signal of said extracted is carried out characteristic parameter extraction, obtain initial amplitude, relaxation time, phase place, frequency information;
G, carry out FORWARD AND INVERSE PROBLEMS according to the initial amplitude, relaxation time, phase place, the frequency information that obtain and handle, estimate groundwater reserve and permeability.
Embodiment 2
Computing machine 1 is connected with control system 2 by Serial Port Line, computing machine 1 is connected with emission power 3 by control line, control system 2 drives 4 by signal wire and emission control and is connected, emission control drives 4 and is connected with emission/receiving coil 9 through high-power H bridge circuit 7 by signal wire, control system 2 is connected with reception control module 5 by control line, receiving control module 5 is connected with multi-channel A/D collecting unit 16 by control line, multi-channel A/D collecting unit 16 is connected with computing machine 1 by data line, control system 2 is by control line and transceiver toggle switch 6, first change-over switch 13, second change-over switch 18 connects, emission power 3 is connected with high-power H bridge circuit 7 by the interactive signal line, H bridge circuit 7 output terminals with join humorous electric capacity 8 and be connected with emission/receiving coil 9, emission/receiving coil 9 is by signal wire and transceiver toggle switch 6, signal conditioning circuit 10, signal amplifier 11 is connected with multi-channel A/D collecting unit 16, first reference coil 12 is through first change-over switch 13, first modulate circuit 14, first amplifier 15 is connected with multi-channel A/D collecting unit 16, and second reference coil 17 is through second change-over switch 18, second modulate circuit 19, second amplifier 20 connects and composes with multi-channel A/D collecting unit 16.
The nuclear magnetic resonance underground water detection method that has reference coil, concrete implementation step comprises:
A, in surveying the district, select the detection place, with the sensing point is the center, lay square emission/receiving coil 9, determine to lay two reference coils according near the electromagnetic interference source situation sensing point, reference coil wants as close as possible interference source to lay, at least be greater than the length of side of square emission/receiving coil 9 with the distance on emission/receiving coil 9 wire frame borders, what guarantee the reference coil collection with this is noise rather than NMR signal;
B, unlatching have the nuclear magnetic resonance underground water detection system of reference coil, emission control drives in the 4 control high-power H bridge road direction emission/receiving coils 9 and infeeds the exchange current that frequency is a Larmor frequency, size by the output of computing machine 1 control break emission power 3 voltages, change the size of H bridge circuit output current in emission/receiving coil 9, promptly change the size of excitation pulse square, thereby excite the water body of underground different depth;
C, control system 2 controls disconnect exciting fields, control transceiver toggle switch 6, first change-over switch 13, second change-over switch 18 will launch synchronously/receiving coil 9 in NMR signal and first reference coil 12, second reference coil 17 the all-wave graphic data of noise signal by multi-channel A/D collecting unit 16 collections;
D, NMR signal and noise signal all-wave graphic data that multi-channel A/D collecting unit 16 is gathered are uploaded to computing machine 1, calculate the maximum correlation of the noise signal and the NMR signal that emission/receiving coil 9 is gathered of reference coil collection, optimum value is more than 0.7, if calculated value is worth less than this, then lay the position of reference coil again, repeating step b and step c;
E, based on the adaptive noise cancellation principle, adopt the adaptive noise cancellation system have two reference coils, variable-step self-adaptive LMS algorithm carries out noise cancellation, realizes effective extraction of NMR signal;
F, the nuclear magnetic resonance all-wave shape signal of said extracted is carried out characteristic parameter extraction, obtain initial amplitude, relaxation time, phase place, frequency information;
G, carry out FORWARD AND INVERSE PROBLEMS according to the initial amplitude, relaxation time, phase place, the frequency information that obtain and handle, estimate groundwater reserve and permeability.
Embodiment 3
Computing machine 1 is connected with control system 2 by Serial Port Line, computing machine 1 is connected with emission power 3 by control line, control system 2 drives 4 by signal wire and emission control and is connected, emission control drives 4 and is connected with emission/receiving coil 9 through high-power H bridge circuit 7 by signal wire, control system 2 is connected with reception control module 5 by control line, receiving control module 5 is connected with multi-channel A/D collecting unit 16 by control line, multi-channel A/D collecting unit 16 is connected with computing machine 1 by data line, control system 2 is by control line and transceiver toggle switch 6, first change-over switch 13, second change-over switch 18 ... and even the 8th change-over switch 22 connects, emission power 3 is connected with high-power H bridge circuit 7 by the interactive signal line, H bridge circuit 7 output terminals with join humorous electric capacity 8 and be connected with emission/receiving coil 9, emission/receiving coil 9 is by signal wire and transceiver toggle switch 6, signal conditioning circuit 10, signal amplifier 11 is connected with multi-channel A/D collecting unit 16, first reference coil 12 is through first change-over switch 13, first modulate circuit 14, first amplifier 15 is connected with multi-channel A/D collecting unit 16, second reference coil 17 is through second change-over switch 18, second modulate circuit 19, second amplifier 20 is connected with multi-channel A/D collecting unit 16, and the 8th reference coil 21 is through the 8th change-over switch 22, the 8th modulate circuit 23, the 8th amplifier 24 connects and composes with multi-channel A/D collecting unit 16.
The nuclear magnetic resonance underground water detection method that has reference coil, concrete implementation step comprises:
A, in surveying the district, select the detection place, with the sensing point is the center, lay square emission/receiving coil 9, determine to lay eight reference coils according near the electromagnetic interference source situation sensing point, reference coil wants as close as possible interference source to lay, at least be greater than the length of side of square emission/receiving coil 9 with the distance on emission/receiving coil 9 wire frame borders, what guarantee the reference coil collection with this is noise rather than NMR signal;
B, unlatching have the nuclear magnetic resonance underground water detection system of reference coil, emission control drives in the 4 control high-power H bridge road direction emission/receiving coils 9 and infeeds the exchange current that frequency is a Larmor frequency, size by the output of computing machine 1 control break emission power 3 voltages, change the size of H bridge circuit output current in emission/receiving coil 9, promptly change the size of excitation pulse square, thereby excite the water body of underground different depth;
C, control system 2 controls disconnect exciting fields, control transceiver toggle switch 6, first change-over switch 13, second change-over switch 18 and even the 8th change-over switch 22 will launch synchronously/receiving coil 9 in NMR signal and first reference coil 12, second reference coil 17 and the 8th reference coil 21 the all-wave graphic data of noise signal by multi-channel A/D collecting unit 16 collections;
D, NMR signal and noise signal all-wave graphic data that multi-channel A/D collecting unit 16 is gathered are uploaded to computing machine 1, calculate the maximum correlation of the noise signal and the NMR signal that emission/receiving coil 9 is gathered of reference coil collection, optimum value is more than 0.7, if calculated value is worth less than this, then lay the position of reference coil again, repeating step b and step c;
E, based on the adaptive noise cancellation principle, adopt the adaptive noise cancellation system have eight reference coils, variable-step self-adaptive LMS algorithm carries out noise cancellation, realizes effective extraction of NMR signal;
F, the nuclear magnetic resonance all-wave shape signal of said extracted is carried out characteristic parameter extraction, obtain initial amplitude, relaxation time, phase place, frequency information;
G, carry out FORWARD AND INVERSE PROBLEMS according to the initial amplitude, relaxation time, phase place, the frequency information that obtain and handle, estimate groundwater reserve and permeability.
Claims (2)
1. nuclear magnetic resonance underground water detection system that has reference coil, it is characterized in that, computing machine 1 is connected with control system 2 by Serial Port Line, computing machine 1 is connected with emission power 3 by control line, control system 2 drives 4 by signal wire and emission control and is connected, emission control drives 4 and is connected with emission/receiving coil 9 through high-power H bridge circuit 7 by signal wire, control system 2 is connected with reception control module 5 by control line, receiving control module 5 is connected with multi-channel A/D collecting unit 16 by control line, multi-channel A/D collecting unit 16 is connected with computing machine 1 by data line, control system 2 is by control line and transceiver toggle switch 6, first change-over switch 13, second change-over switch 18 ... and even N change-over switch 22 connects, emission power 3 is connected with high-power H bridge circuit 7 by the interactive signal line, H bridge circuit 7 output terminals with join humorous electric capacity 8 and be connected with emission/receiving coil 9, emission/receiving coil 9 is by signal wire and transceiver toggle switch 6, signal conditioning circuit 10, signal amplifier 11 is connected with multi-channel A/D collecting unit 16, first reference coil 12 is through first change-over switch 13, first modulate circuit 14, first amplifier 15 is connected with multi-channel A/D collecting unit 16, second reference coil 17 is through second change-over switch 18, second modulate circuit 19, second amplifier 20 is connected with multi-channel A/D collecting unit 16, and N reference coil 21 is through N change-over switch 22, N modulate circuit 23, N amplifier 24 connects and composes with multi-channel A/D collecting unit 16.
2. according to the described nuclear magnetic resonance underground water detection system that has reference coil of claim 1, it is characterized in that, in the following order with step work:
A, in surveying the district, select the detection place, with the sensing point is the center, lay square emission/receiving coil 9, determine to lay at least one reference coil and even N reference coil according near the electromagnetic interference source situation sensing point, reference coil wants as close as possible interference source to lay, at least be greater than the length of side of square emission/receiving coil 9 with the distance on emission/receiving coil 9 wire frame borders, what guarantee the reference coil collection with this is noise rather than NMR signal;
B, unlatching have the nuclear magnetic resonance underground water detection system of reference coil, emission control drives in the 4 control high-power H bridge road direction emission/receiving coils 9 and infeeds the exchange current that frequency is a Larmor frequency, size by the output of computing machine 1 control break emission power 3 voltages, change the size of H bridge circuit output current in emission/receiving coil 9, promptly change the size of excitation pulse square, thereby excite the water body of underground different depth;
C, control system 2 controls disconnect exciting fields, control transceiver toggle switch 6, first change-over switch 13, second change-over switch 18 and even N change-over switch 22 will launch synchronously/receiving coil 9 in NMR signal and first reference coil 12, second reference coil 17 and the N reference coil 21 the all-wave graphic data of noise signal by multi-channel A/D collecting unit 16 collections;
D, NMR signal and noise signal all-wave graphic data that multi-channel A/D collecting unit 16 is gathered are uploaded to computing machine 1, calculate the maximum correlation of the noise signal and the NMR signal that emission/receiving coil 9 is gathered of reference coil collection, optimum value is more than 0.7, if calculated value is worth less than this, then lay the position and the quantity of reference coil again, repeating step b and step c;
E, based on the adaptive noise cancellation principle, adopt the adaptive noise cancellation system have one or N reference coil, the variable-step self-adaptive least mean square algorithm carries out noise cancellation, effective extraction of realization NMR signal;
F, the nuclear magnetic resonance all-wave shape signal of said extracted is carried out characteristic parameter extraction, obtain initial amplitude, relaxation time, phase place, frequency information;
G, carry out FORWARD AND INVERSE PROBLEMS according to the initial amplitude, relaxation time, phase place, the frequency information that obtain and handle, estimate groundwater reserve and permeability.
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