CN102096111A - Transmitting-receiving antenna separation type nuclear magnetic resonance water exploring device and water exploring method - Google Patents
Transmitting-receiving antenna separation type nuclear magnetic resonance water exploring device and water exploring method Download PDFInfo
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- CN102096111A CN102096111A CN 201010576048 CN201010576048A CN102096111A CN 102096111 A CN102096111 A CN 102096111A CN 201010576048 CN201010576048 CN 201010576048 CN 201010576048 A CN201010576048 A CN 201010576048A CN 102096111 A CN102096111 A CN 102096111A
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Abstract
The invention relates to a transmitting-receiving antenna separation type nuclear magnetic resonance water exploring device and water exploring method. A computer is connected with a high power supply, a transmitting and control unit, a current collecting unit, a frequency-selecting amplifying unit and a signal collecting unit through serial ports, wherein a control bus is connected with a harmony matching capacitor, a transmitting coil and a diode through an H bridge circuit to form the transmitting and control unit. The water exploring device and water exploring method provided by the invention enable a transmitting antenna and a receiving antenna to be separated, thus a transmitting system and a receiving system can be mutually independent. The water exploring device and water exploring method provided by the invention have the advantages that the high and low voltage separation of transmitting and receiving is realized, thus the reliability of the systems is enhanced; the multiple aspects such as the turn number, dimension, wire diameter, laying type and the like of the transmitting antenna and the receiving antenna are not mutually restricted, thus the amplitude of receiving signals is enhanced, the detecting depth is increased and the detecting speed is enhanced; the far-end reference can cancel interference to enhance the signal-to-noise ratio; and the more comprehensive underground water distribution information can be obtained through three-component measurement, thus the detecting efficiency, accuracy and horizontal resolution are enhanced.
Description
Technical field
The present invention relates to a kind of geophysical prospecting equipment and method, especially the nuclear magnetic resonance water detection device and the outdoor operation method that separate with nuclear magnetic resonance water detection device of dual-mode antenna.
Background technology
Magnetic nuclear resonance method (Surface Nuclear Magnetic Resonance Method is called for short the SNMR method).
CN201051151 discloses a kind of nuclear magnetic resonance water witch, is made up of emission coefficient, receiving system, system controlled by computer and register system three parts, and DC/DC transducer one end connects battery, and the other end connects superpower accumulator; Superpower accumulator is connected with the high power AC square-wave generator, is provided with K switch 1 in the middle of it, and the high power AC square-wave generator also is connected with resonance frequency generator, K switch 2, K3; Be connected in series transmitting coil between K switch 2 and the K3 and join humorous capacitor group; K3, K4 connect ultra-low noise amplifier respectively, join dependency detecting amplifier again, tie geophone and phase detectors again, wave detector connects A/D converter and connects system controlled by computer and register system, and phase detectors are connected and connect system controlled by computer and register system with resonance frequency generator with A/D converter.The utility model beneficial effect is: volume, weight are little, and instrument job security, reliability improve greatly, the capacity usage ratio height, and frequency stability is good.
The nuclear magnetic resonance analyser of foregoing invention and method thereof have higher measuring accuracy, spot measurement is accurate, but a deficiency is arranged, that be exactly measure a point can only obtain whether water (for example 100m*100m coil measurement area is 10,000 square metres), the accurate location that is difficult to realize water body are arranged in the very big scope.
Carry out nuclear magnetic resonance underground water and survey if emitting antenna separated with receiving antenna, the method of utilizing dual-mode antenna to separate just can be carried out an emission, a plurality of receiving coil receives NMR signal, can accurately locate body of groundwater, will improve the accuracy of seeking zone of interest greatly.The method that dual-mode antenna separates can improve the efficiency and precision of detection, has also avoided many work that repeat, and has saved fund, manpower, time.
Summary of the invention
Purpose of the present invention is exactly at above-mentioned the deficiencies in the prior art, provides a kind of dual-mode antenna to separate formula nuclear magnetic resonance water detection device;
Another object of the present invention provides a kind of dual-mode antenna to separate the groundwater prospecting method of formula nuclear magnetic resonance water detection device.
The objective of the invention is to realize in the following manner:
Computing machine is connected with large power supply, emission and control module, current acquisition unit, frequency-selecting amplifying unit, signal gathering unit by serial ports, emission and control module by control bus through the H bridge circuit with join humorous electric capacity, transmitting coil and diode and be connected, emission and control module are connected with the frequency-selecting amplifying unit with receiving coil through high-voltage relay, launch and control module by control bus and current acquisition unit, the signal gathering unit formation that is connected in parallel.
Be connected with on the H bridge circuit and join humorous electric capacity, transmitting coil and diode, large power supply is the power supply of H bridge circuit.
The frequency-selecting amplifying unit is to be connected with switching capacity filter with DDS clock generating module through MCU by communication module, and receiving coil connects and composes through joining humorous electric capacity selection, prime amplifier, bandpass filtering and switching capacity filter and programme-controlled gain module.
Signal gathering unit is to be connected with collection beginning timer, acquisition time timer, sample frequency timer through clock control by MCU, the sample frequency timer is connected with ADC, NMR signal is connected with MCU through ADC, data-switching, clock control by signal wire respectively with high-precision clock, gather and to be connected synchronously, MCU by signal wire communicate by letter with 485 respectively, storer connects and composes.
Dual-mode antenna separates the groundwater prospecting method of formula nuclear magnetic resonance water detection device, comprises following order and step worker:
A, in the survey district of a underground condition the unknown, at first utilize magnetometer to measure local terrestrial magnetic field B
0(nT), pass through f
L(Hz)=0.04258*B
0(nT) converse Larmor frequency;
B, by Larmor frequency and transmitting coil inductance
Calculate and select emission to join humorous electric capacity, emission and control module, current acquisition unit, frequency-selecting amplifying unit and the needed controlled variable of signal gathering unit are set;
C, lay a dispatch coil surveying the district, according to the inductance of dispatch coil calculate the frequency-selecting amplifying unit required join humorous electric capacity
D, operation dual-mode antenna separate formula nuclear magnetic resonance water detection device Control Software, beginning data acquisition;
After e, data acquisition were finished, the operation dual-mode antenna separated formula nuclear magnetic resonance water detection device interpretation software, and inverting obtains the information such as electric conductivity in phreatic water cut, pore size, water-bearing zone, draws the water cut histogram, and measurement finishes.
Emission: emission and control module produce the transmit square waves of local Larmor frequency, and square wave is controlled the H bridge circuit after overdriving, and large power supply produces the high pressure that needs and gives the power supply of H bridge circuit.Be connected with transmitting coil on the H bridge circuit, join humorous electric capacity and bilateral diode.Transmitting coil with join humorous electric capacity LC series resonance, excite underground water to produce nuclear magnetic resonance.Emission 40mS, after stopping to launch, the dump energy in the loop discharges by bilateral diode.
Receive: high-voltage relay makes receiving coil unsettled when emission, and dump energy discharges the back high-voltage relay switching that finishes makes receiving coil insert amplifier, and signal gathering unit is gathered NMR signal under the control of emission and control module.
Beneficial effect: existing transmitting and receiving of nuclear magnetic resonance underground water detection system is common antenna, common antenna need satisfy more constraint simultaneously in many aspects such as the number of turn, size, line footpath, paving modes, has seriously restricted the application of nuclear magnetic resonance underground water detection method.The present invention separates emitting antenna with receiving antenna, make emission coefficient and the receiving system can be separate.Its advantage is: one has realized that the high-low pressure that transmits and receives isolates, and has improved the reliability of system; Two make the number of turn of emitting antenna and receiving antenna, size, the line footpath, many aspects such as paving mode are mutual restriction no longer, can realize more powerful emission by the line footpath of strengthening emitting antenna, by adopting the small size receiving antenna can improve the lateral resolution of detection, by adopting multiturn coil to receive the amplitude that can improve received signal, increase investigation depth, can significantly improve the speed of detection by many antennas synchronous acquisition, with reference to offsetting interference, improve signal to noise ratio (S/N ratio) by far-end, can obtain more fully underground water distribution information by the three-component measurement.Detection efficiency, precision and horizontal resolution have been improved.
Accompanying drawing and description of drawings
Fig. 1 is that dual-mode antenna separates formula nuclear magnetic resonance water detection apparatus structure block diagram
Fig. 2 is a large power supply structured flowchart in the accompanying drawing 1
Fig. 3 is transmitting coil loop annexation figure in the accompanying drawing 1
Fig. 4 is a receiving coil structured flowchart in the accompanying drawing 1
Fig. 5 is a frequency-selecting amplifying unit structured flowchart in the accompanying drawing 1
Fig. 6 is a signal gathering unit structured flowchart in the accompanying drawing 1
Fig. 7 is that transmitting coil when dual-mode antenna separates formula nuclear magnetic resonance water detection device field work in the accompanying drawing 1, receiving coil are laid synoptic diagram.
Embodiment
Be described in further detail below in conjunction with drawings and Examples:
As shown in Figure 1, computing machine is connected with large power supply, emission and control module, current acquisition unit, frequency-selecting amplifying unit, signal gathering unit by serial ports, emission and control module by control bus through the H bridge circuit with join humorous electric capacity, transmitting coil and diode and link, emission and control module are connected with the frequency-selecting amplifying unit with receiving coil through high-voltage relay, launch and control module by control bus and current acquisition unit, the signal gathering unit formation that is connected in parallel.
Be connected with on the H bridge circuit and join humorous electric capacity, transmitting coil and diode, large power supply is the power supply of H bridge circuit.
As shown in Figure 5, the frequency-selecting amplifying unit is to be connected with switching capacity filter with DDS clock generating module through MCU by communication module, and receiving coil connects and composes through joining humorous electric capacity selection, prime amplifier, bandpass filtering and switching capacity filter and programme-controlled gain module.
As shown in Figure 6, signal gathering unit is to be connected with collection beginning timer, acquisition time timer, sample frequency timer through clock control by MCU, the sample frequency timer is connected with ADC, NMR signal is connected with MCU through ADC, data-switching, clock control by signal wire respectively with high-precision clock, gather and to be connected synchronously, MCU by signal wire communicate by letter with 485 respectively, storer connects and composes.
Dual-mode antenna separates the groundwater prospecting method of formula nuclear magnetic resonance water detection device, comprises following order and step worker:
A, in the survey district of a underground condition the unknown, at first utilize magnetometer to measure local terrestrial magnetic field B
0(nT), pass through f
L(Hz)=0.04258*B
0(nT) converse Larmor frequency;
B, by Larmor frequency and transmitting coil inductance
Calculate and select emission to join humorous electric capacity, emission and control module, current acquisition unit, frequency-selecting amplifying unit and the needed controlled variable of signal gathering unit are set;
C, lay a dispatch coil surveying the district, according to the inductance of dispatch coil calculate the frequency-selecting amplifying unit required join humorous electric capacity
D, operation dual-mode antenna separate formula nuclear magnetic resonance water detection device Control Software, beginning data acquisition;
After e, data acquisition were finished, the operation dual-mode antenna separated formula nuclear magnetic resonance water detection device interpretation software, and inverting obtains the information such as electric conductivity in phreatic water cut, pore size, water-bearing zone, draws the water cut histogram, and measurement finishes.
Emission: emission and control module produce the transmit square waves of local Larmor frequency, and square wave is controlled the H bridge circuit after overdriving, and large power supply produces the high pressure that needs and gives the power supply of H bridge circuit.Be connected with transmitting coil on the H bridge circuit, join humorous electric capacity and bilateral diode.Transmitting coil with join humorous electric capacity LC series resonance, excite underground water to produce nuclear magnetic resonance.Emission 40mS, after stopping to launch, the dump energy in the loop discharges by bilateral diode.
Receive: high-voltage relay makes receiving coil unsettled when emission, and dump energy discharges the back high-voltage relay switching that finishes makes receiving coil insert amplifier, and signal gathering unit is gathered NMR signal under the control of emission and control module.
Computing machine carries out communication by serial ports, and speed is 57600bit/s.
Large power supply reaches the magnitude of voltage of setting to large bulk capacitance charging under the control of computing machine and large power supply MCU, give the IGBT power supply of H bridge circuit.
Emission and control module generation transmitted waveform, relay switching signal, electric current begin acquired signal, signal begins the acquisition controlling signal.The transmitter current waveform is gathered in the current acquisition unit.
Signal gathering unit is gathered the NMR signal waveform, and with 32 times of Larmor frequency collections, AD utilizes 24 ∑ Δ type AD7760, utilizes the digital quadrature method to detect the NMR signal envelope.
The frequency-selecting amplifying unit is made up of nuclear magnetic resonance impedance matching network, nuclear magnetic resonance prime amplifier, LC frequency-selecting amplifier, power frequency notch filter and post-amplifier.Frequency-selecting amplifying unit frequency can be adjusted in the 1kHz-3kHz scope, and centre frequency place enlargement factor is 400,000 times.Add a high performance power-supply filter between power supply, reduces harassing of amplifying circuit generation not at the same level the power supply of nuclear magnetic resonance prime amplifier and impedance matching network and back level amplifying circuit.
Dual-mode antenna separates the open-air concrete method of work of formula nuclear magnetic resonance water detection device:
A, in the survey district of a underground condition the unknown, at first utilize magnetometer to measure local terrestrial magnetic field B
0(nT), pass through f
L(Hz)=0.04258*B
0(nT) converse Larmor frequency;
B, by Larmor frequency and transmitting coil inductance L, calculate to select emission to join humorous electric capacity
Emission and control module, current acquisition unit, frequency-selecting amplifying unit and the needed controlled variable of signal gathering unit are set;
C, lay a dispatch coil surveying the district, according to the inductance of dispatch coil calculate the frequency-selecting amplifying unit required join humorous electric capacity
D, operation dual-mode antenna separate formula nuclear magnetic resonance water detection device Control Software, beginning data acquisition;
After e, collection were finished, the operation dual-mode antenna separated formula nuclear magnetic resonance water detection device interpretation software, and inverting obtains the information such as electric conductivity in phreatic water cut, pore size, water-bearing zone, draws the water cut histogram, and measurement finishes.
Claims (4)
1. a dual-mode antenna separates formula nuclear magnetic resonance water detection device, it is characterized in that, computing machine is connected with large power supply, emission and control module, current acquisition unit, frequency-selecting amplifying unit, signal gathering unit by serial ports, emission and control module by control bus through the H bridge circuit with join humorous electric capacity, transmitting coil and diode and link, emission and control module are connected with the frequency-selecting amplifying unit with receiving coil through high-voltage relay, launch and control module by control bus and current acquisition unit, the signal gathering unit formation that is connected in parallel.
2. separate formula nuclear magnetic resonance water detection device according to the described dual-mode antenna of claim 1, it is characterized in that, the frequency-selecting amplifying unit is to be connected with switching capacity filter with DDS clock generating module through MCU by communication module, and receiving coil connects and composes through joining humorous electric capacity selection, prime amplifier, bandpass filtering and switching capacity filter and programme-controlled gain module.
3. separate formula nuclear magnetic resonance water detection device according to the described dual-mode antenna of claim 1, it is characterized in that, signal gathering unit is to be connected with collection beginning timer, acquisition time timer, sample frequency timer through clock control by MCU, the sample frequency timer is connected with ADC, NMR signal is connected with MCU through ADC, data-switching, clock control by signal wire respectively with high-precision clock, gather and to be connected synchronously, MCU by signal wire communicate by letter with 485 respectively, storer connects and composes.
4. separating formula nuclear magnetic resonance water detection device according to the described dual-mode antenna of claim 1 provides a kind of dual-mode antenna to separate the water detection of formula nuclear magnetic resonance, comprises following order and step worker:
A, in the survey district of a underground condition the unknown, at first utilize magnetometer to measure local terrestrial magnetic field, converse Larmor frequency by the terrestrial magnetic field;
B, calculate by Larmor frequency and transmitting coil inductance and to select emission to join humorous electric capacity, emission and control module, current acquisition unit, frequency-selecting amplifying unit and the needed controlled variable of signal gathering unit are set;
C, lay a dispatch coil surveying the district, according to the inductance of dispatch coil calculate the frequency-selecting amplifying unit required join humorous electric capacity;
D, operation dual-mode antenna separate formula nuclear magnetic resonance water detection device Control Software, beginning data acquisition;
After e, data acquisition were finished, the operation dual-mode antenna separated formula nuclear magnetic resonance water detection device interpretation software, and inverting obtains the electric conductivity information in phreatic water cut, pore size, water-bearing zone, draws the water cut histogram, and measurement finishes.
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| CN103809206A (en) * | 2014-03-11 | 2014-05-21 | 吉林大学 | Underground water detection device and detection method based on combination of nuclear magnetic resonance and transient electromagnetic method |
| CN103852794A (en) * | 2014-03-27 | 2014-06-11 | 吉林大学 | Hydrocarbon polluted shallow groundwater magnetic resonance detection device and hydrocarbon polluted shallow groundwater magnetic resonance detection method |
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