CN206671580U - Nuclear magnetic resonance based on array inversion charging visits water emitter - Google Patents
Nuclear magnetic resonance based on array inversion charging visits water emitter Download PDFInfo
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- CN206671580U CN206671580U CN201720292070.8U CN201720292070U CN206671580U CN 206671580 U CN206671580 U CN 206671580U CN 201720292070 U CN201720292070 U CN 201720292070U CN 206671580 U CN206671580 U CN 206671580U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model visits water emitter for a kind of nuclear magnetic resonance based on array inversion charging.PC, it is built-in with upper computer software and parameter is configured；MCU Main Processing Unit is communicated with PC, and array inverter is controlled；Fpga logic control unit, receive the startup order of the MCU Main Processing Unit, it is caused that there is Larmor frequency sequential to drive transmitting bridge by drive module so that transmitting bridge is worked, and HVDC electric signal is transformed into the high-voltage alternating electric signal with local Larmor frequency；Unit can be released, is controlled by MCU Main Processing Unit, connects the energy capacitance set of excitation variable winding, the dump energy after transmitting terminates in energy capacitance set, is discharged dump energy by the way that unit can be released.The utility model can be kept launching excitation voltage every time, additionally it is possible to initial setting voltage is kept after multiple stacking, and the charge efficiency to energy capacitance set is improved while volume is reduced.
Description
Technical field
The invention belongs to geophysical prospecting equipment field, especially a kind of nuclear magnetic resonance based on array inversion charging is visited
Water emitter.
Background technology
During ground nuclear magnetic resonance water detection, emitter has as one of nucleus equipment for exciting magnetic resonance field
The features such as high-power, accurate, quick transmitting pulse, during test water, excited generally by increase in nuclear magnetic resonance
Pulse square changes investigation depth, and excitation pulse square is q=I0*τp, and I0And τpRespectively pulsed emission current amplitude and transmitting
Duration, launch time are typically constant, and it is big mainly by increase emission current, that is, increase to increase excitation pulse square
The voltage of power power-supply.Therefore, in order to obtain the hydrographic information of deeper, it is necessary to which emitter provides bigger voltage.And
During actual detection, because detection place periphery electromagnetic environment is complicated, noise jamming is serious, it is necessary to carries out multiple stacking
Transmitting, to improve signal to noise ratio, and then obtains available NMR signal, but superposition is required to reach higher transmitting every time
Voltage, the time of more than tens of seconds is required to storage capacitor charging.And be so superimposed repeatedly, cause to measure needs being every time up to
Or so two hours, this also just seriously constrains the efficiency of nuclear magnetic resonance water detector and method is promoted.And one have quickly hold
The nuclear magnetic resonance emitter of continuous charge characteristic also just turns into key that is quick, efficiently visiting water.
CN102053280A discloses a kind of nuclear magnetic resonance underground water detection system carried with reference to excitation variable winding and detection
Method.By the NMR signal in multi-channel A/D collecting units collection transmitting/reception excitation variable winding and with reference to excitation variable winding
The all-wave graphic data of middle noise signal, by the maximum for calculating the noise signal gathered with reference to excitation variable winding and NMR signal
Correlation, the laying with reference to excitation variable winding optimum position and quantity is realized, in the case where signal and noise statisticses are unknown,
Using variable step size adaptive algorithm, the noise in transmitting/reception excitation variable winding acquisition NMR signal is offseted to greatest extent.Its
The extraction of the lower NMR signal of more Source noise interference is realized to a certain extent, is efficiently solved residential block nuclear-magnetism and is total to
The problem of detection of shaking disturbs more, a variety of interference noise data to be difficult to separation.
CN104216021A discloses a kind of underground nuclear magnetic resonance detection method based on multiple step format transmitting.The detection of use
Device include transmitting excitation variable winding, transmitting host computer, slave computer, booster power, storage capacitor, transmitting bridge, detection means with
And be connected with humorous electric capacity, transmitting host computer by serial bus and communication interface with slave computer, slave computer and booster power
Connection, booster power connect storage capacitor and charged to storage capacitor, while slave computer connects transmitting bridge by drive control circuit
Lu Houyu storage capacitors are connected, and storage capacitor is connected by launching excitation variable winding with humorous capacitance connection, while storage capacitor
Voltage is detected by detection means, the output end of detection means is connected with slave computer, detection means detection transmitting excitation variable winding
Electric current be connected with slave computer, by the pattern repeatedly launched of once charging to storage capacitor, improve in detection process
Operating efficiency, reduce repeated work consuming time.
The nuclear magnetic resonance water detection emitter of foregoing invention is respectively provided with higher survey for special needs and application scenario
Accuracy of measurement and good measurement effect, but all come with some shortcomings：Detected with the nuclear magnetic resonance underground water with reference to excitation variable winding
In system and detection method due to its use traditional single DC-DC power source, single capacitor charging, therefore charge efficiency it is relatively low and it is time-consuming compared with
Long, this just seriously constrains the operating efficiency of nuclear-magnetism water detection detection.And based on the underground nuclear magnetic resonance detection side of multiple step format transmitting
Method, although reaching the emitting voltage value of setting using once charging, electric quantity loss is extremely serious after multiple transmitting, passes through
Repeatedly after transmitting superposition, sufficiently large emitting voltage can not be provided, and is equally faced with the problem of charging is slow, therefore,
Also just can not quick obtaining be beneficial to inverting NMR signal.
The content of the invention
The technical problems to be solved by the invention are that providing a kind of nuclear magnetic resonance based on array inversion charging visits water hair
Injection device, continual and steady charging is carried out to capacitance group by multiple medium and small power array power supplys, can not only be kept each
Launch excitation voltage, additionally it is possible to initial setting voltage is kept after multiple stacking, and is improved while volume is reduced to storage
The charge efficiency of energy capacitance group.
The present invention is achieved in that
A kind of nuclear magnetic resonance based on array inversion charging visits water emitter, including：
PC, upper computer software is built-in with to emitting voltage, stacking fold, Larmor frequency, emission duration, energy
The parameters such as release time are configured；
MCU Main Processing Unit, communicated, array inverter is controlled, and Current Voltage is detected into mould with PC
The current and voltage signals for the transmitting bridge that block detects are transferred to PC；
Fpga logic control unit, receives the startup order of the MCU Main Processing Unit, caused when having Larmor frequency
Sequence drives transmitting bridge by drive module so that transmitting bridge is worked, and HVDC electric signal is transformed into and drawn with local
The high-voltage alternating electric signal of More's frequency；
Unit can be released, is controlled by MCU Main Processing Unit, connects the energy capacitance set of excitation variable winding, the root after transmitting terminates
According to the dump energy in energy capacitance set, dump energy is discharged by the way that unit can be released.
With humorous electric capacity and coil collective effect, series resonance occurs, produces the alternating impulse with local Larmor frequency
Signal excitation field.
Further, the array inverter includes multiple Inverters in parallel, the multiple inverter
The output connection of module and voltage control module, while each Inverter is carried out by the sharing control unit of connection
Current uniform, progress electric current is fed back by current value and adjusted in real time so that the electric current of each Inverter output is substantially
It is identical.
Further, the array inverter carries out constant-current charge by synchronous output module to energy capacitance set.
Further, Inverter includes：
Low pressure electric signal is converted into the full-bridge inverting module of high-frequency alternating low pressure electric signal；
High-frequency alternating low pressure electric signal is received by primary side end, the high pressure transformation of high-frequency and high-voltage electric signal is exported through secondary end
Device；
The control module detected to the output voltage of high-tension transformer；
Full-bridge inverting module is driven by the control of control module so that high-tension transformer stably exports high frequency height
The drive module of piezoelectric signal；
The rectification unit of rectifying and wave-filtering is carried out to the output voltage of high-tension transformer；And
Circuit is detected, the constant current output after rectification is detected and reaches sharing control unit progress current uniform tune
Control.
Further, the high-voltage signal after rectification unit conversion carries out electric current conversion by sampling resistor, and carries out perseverance
Stream output.
Further, sharing control unit carries out detection record to the Inverter quantity N of carry first, then root
According to the emitting voltage set with voltage difference after emitter transmitting once as VDSize, to determine to energy capacitance set charging
Electric current IDSize, all modules are adjusted in real time with this benchmark, gradient current pair is formed when carrying out multiple stacking transmitting
Storage capacitor charges.
Compared with prior art, beneficial effect is the present invention：
The present invention meets in differences such as changeable shallow-layer, the mine that deep phreatic water detects and spatial distribution is uneven, tunnels
Mission need under complicated geological environment.According to different detection environment and different investigation depths, can by increase or
Person reduces array power module, is combined into the emitter with different transmission powers, and the exciting field to produce stable provides
Continual and steady emitting voltage.Due to being charged using array inversion, therefore it has higher maintainability and redundancy, and can
While emitter volume is reduced, additionally it is possible to improve emission system stability and charge efficiency, and then improve underground water and visit
Operating efficiency is surveyed, obtaining effective, accurate water content magnetic resonance signal for the later stage provides reliable guarantee.
Brief description of the drawings
Fig. 1 is the modular structure block diagram that the nuclear magnetic resonance based on array inversion charging visits water emitter；
Fig. 2 is 3 group pattern Inverter block diagrams in an embodiment；
Fig. 3 is the circuit diagram of full-bridge inverting module；
Fig. 4 is the circuit diagram of sharing control unit.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Referring to Fig. 1, a kind of nuclear magnetic resonance based on array inversion charging visits water emitter, including：
PC, MCU Main Processing Unit, fpga logic control unit, drive module, transmitting bridge, with humorous electric capacity, excitation line
Circle, the control of Current Voltage detection module, A/D modular converters, array inverter, voltage, D/A modular converters, can release unit,
24V dc sources etc. are formed.PC through MCU Main Processing Unit, fpga logic control unit, drive module, transmitting bridge, with humorous electricity
Appearance is connected with excitation variable winding；MCU Main Processing Unit is through D/A modular converters, voltage control module, array inverter and transmitting bridge
It is connected；Transmitting bridge is connected via Current Voltage detection module, A/D modular converters with MCU Main Processing Unit simultaneously；MCU master control lists
Member is via can release unit and excitation variable winding.24V dc sources provide power supply for the work of whole emission system.
Specifically：PC, be built-in with upper computer software to emitting voltage, stacking fold, Larmor frequency, transmitting continue when
Between, the parameter such as energy release time is configured；
MCU Main Processing Unit, communicated, array inverter is controlled, and Current Voltage is detected into mould with PC
The current and voltage signals for the transmitting bridge that block detects are transferred to PC；
Fpga logic control unit, receives the startup order of the MCU Main Processing Unit, caused when having Larmor frequency
Sequence drives transmitting bridge by drive module so that transmitting bridge is worked, and HVDC electric signal is transformed into and drawn with local
The high-voltage alternating electric signal of More's frequency；
Unit can be released, is controlled by MCU Main Processing Unit, connects the energy capacitance set of excitation variable winding, the root after transmitting terminates
According to the dump energy in energy capacitance set, dump energy is discharged by the way that unit can be released.
Referring to Fig. 2, array inverter includes multiple Inverters in parallel, the multiple Inverter with
The output connection of voltage control module, at the same it is equal to each Inverter progress electric current by the sharing control unit of connection
Point, progress electric current is fed back by current value and adjusted in real time so that the electric current of each Inverter output is substantially the same.
Array inverter carries out constant-current charge by synchronous output module to energy capacitance set.
Inverter includes：
Low pressure electric signal is converted into the full-bridge inverting module of high-frequency alternating low pressure electric signal；
High-frequency alternating low pressure electric signal is received by primary side end, the high pressure transformation of high-frequency and high-voltage electric signal is exported through secondary end
Device；
The control module detected to the output voltage of high-tension transformer；
Full-bridge inverting module is driven by the control of control module so that high-tension transformer stably exports high frequency height
The drive module of piezoelectric signal；
The rectification unit of rectifying and wave-filtering is carried out to the output voltage of high-tension transformer；And
Circuit is detected, the constant current output after rectification is detected and reaches sharing control unit progress current uniform tune
Control.
High-voltage signal after rectification unit conversion carries out electric current conversion by sampling resistor, and carries out constant current output.
Sharing control unit carries out detection record to the Inverter quantity N of carry first, then according to setting
Voltage difference is V after emitting voltage is launched once with emitterDSize, to determine the electric current I to energy capacitance set chargingDGreatly
It is small, all modules are adjusted in real time with this benchmark, gradient current is formed when carrying out multiple stacking transmitting to storage capacitor
Charging.
Referring to Fig. 3, for the circuit diagram of full-bridge inverting module；For switching tube Q1, switching tube Q2, switching tube Q3, switching tube Q4,
Switching tube Q5, switching tube Q6, switching tube Q7 and switching tube Q8 are respectively 8 high-power switch tubes, to ensure that bridge stably may be used
By work, 8 switching tubes use composes in parallel full-bridge circuit two-by-two.Wherein PWMa, PWMb, PWMc, PWMd are respectively 4 road PWM
Control signal, wherein PWMa are one group with PWMd, and PWMb and PWMc is another group, and differs 180 °, two groups with first group of phase
PWM controls the conducting and cut-off of 4 way switch pipes simultaneously, and the low voltage signal of input is risen into required electricity by transformer
Pressure.It is wherein current mutual-inductance apparatus B2, to feed back to control module AC450V/500W, bridge is stably exported high frequency friendship
Varying signal.
It is the circuit diagram of sharing control unit referring to Fig. 4, the current detecting of three road electric currents is made up of three group of 3902 chip,
The main output current by accurately adjusting the output voltage of converter to match all of 3902 chips.It is mainly examined by electric current
Amplifier, stream driving, stream detection amplifier and error amplifier etc. are formed.The output of current sense amplifier and power supply
The output current of module is directly proportional, and is supplied to as input signal and flows driving amplifier and error amplifier.Stream inspection
Output voltage on amplifier is corresponding with the voltage on current equalizing bus bar.Error amplifier is used for adjusting output voltage, and its is defeated
It is current sense amplifier and stream detection amplifier voltage difference function to go out voltage.By taking three groups of power supplys as an example, all module voltages
With V=(V1+V2+V3On the basis of)/3, and then parallel electric source module is balanced by the output voltage of alignment error amplifier
Load current, and then realize and flow.Peripheral resistance capacitance primarily serves chip configuration and filter action.
Based on array inversion charging nuclear magnetic resonance visit water emitter method of work, using three groups of Inverters as
Example：
Comprise the following steps：
A, by being connected with humorous electric capacity with excitation variable winding both ends in emitter；
B, by PC upper computer software to emitting voltage, stacking fold, Larmor frequency, emission duration, energy
The parameters such as release time are configured, and are sent to MCU Main Processing Unit via communication interface；MCU Main Processing Unit is to voltage parameter
D/A modular converters are carried out, obtain driving voltage control module control byte, then array inverter is started working, and in real time
Magnitude of voltage is fed back into host computer；
C, first group of Inverter group D1：Low pressure electric signal is converted into high-frequency alternating low tension by full-bridge inverting
Signal, high-tension transformer primary side end is delivered to, secondary end exports high-frequency and high-voltage electric signal after high-tension transformer, wherein controlling mould
Block is mainly that the output voltage of transformer is detected, while adjusts drive circuit so that transformer stably exports high frequency height
Piezoelectric signal, high-frequency and high-voltage electric signal export stable high direct voltage electric signal after current rectifying and wave filtering circuit.Height after conversion
Piezoelectric signal carries out electric current conversion by high precision sampling resistance, and carries out constant current output I1。
D, while first group of Inverter is operated, second group of Inverter D2, the 3rd group of inversion
Power module D3 Inverters are operated simultaneously, and position is I respectively for electric current output2、I3, while sharing control unit is to each
Individual power module carries out current uniform, and feed back progress electric current by current value is adjusted in real time so that the electric current of two power supply output
Substantially the same I1=I2=I3；Then all power module output currents are entered via synchronous output module to energy capacitance set
Row constant-current charge, stop charging to storage capacitor after reaching predetermined set emitting voltage, so far complete once to launch.
E, wherein power module quantity detection of the sharing control unit first to carry is recorded as 2, then according to setting
Voltage difference is V after emitting voltage is launched once with emitterDSize, to determine the electric current I to storage capacitor chargingDSize,
The charging current benchmark of wherein each Inverter is I=ID/3；Sharing control unit is entered with this benchmark to all modules
Row adjustment in real time, when carrying out multiple stacking transmitting, repeat step c~e, form gradient current and storage capacitor is charged.
F, it is operated simultaneously in array inverter, MCU Main Processing Unit starts fpga logic by communication bus and controlled
Unit sequential occurs part, there is Larmor frequency sequential to drive transmitting bridge to drive mould caused by fpga logic control unit
Block so that high-power transmitting bridge work, HVDC electric signal is transformed into the high-voltage alternating with local Larmor frequency
Electric signal；
G, when launching work, Current Voltage detection module is gathered in real time to emission current, and through over sampling electricity
Resistance is converted into magnitude of voltage, and the voltage x current value gathered back is carried out into A/D modular converters, fed back to via MCU Main Processing Unit
Position machine software carries out real-time display；
H, the dump energy after transmitting terminates in storage capacitor, is released dump energy by that can release unit
Put, reached safe purpose.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (2)
1. a kind of nuclear magnetic resonance based on array inversion charging visits water emitter, it is characterised in that including：
PC, it is built-in with upper computer software and emitting voltage, stacking fold, Larmor frequency, emission duration, energy is discharged
Time parameter is configured；
MCU Main Processing Unit, communicated with PC, array inverter is controlled, and Current Voltage detection module is examined
The current and voltage signals of the transmitting bridge measured are transferred to PC；
Fpga logic control unit, receive the startup order of the MCU Main Processing Unit, it is caused that there is Larmor frequency sequential to lead to
Module drive of overdriving transmitting bridge so that transmitting bridge is worked, and HVDC electric signal is transformed into local Larmor
The high-voltage alternating electric signal of frequency；
Unit can be released, is controlled by MCU Main Processing Unit, connects the energy capacitance set of excitation variable winding, according to storage after transmitting terminates
Dump energy in energy capacitance group, is discharged dump energy by that can release unit;
The array inverter includes multiple Inverters in parallel, and the multiple Inverter controls with voltage
The output connection of module, while current uniform is carried out to each Inverter by the sharing control unit of connection, pass through
Current value feedback carries out electric current and adjusted in real time so that the electric current of each Inverter output is substantially the same;
The array inverter carries out constant-current charge by synchronous output module to energy capacitance set;
Inverter includes：
Low pressure electric signal is converted into the full-bridge inverting module of high-frequency alternating low pressure electric signal；
High-frequency alternating low pressure electric signal is received by primary side end, the high-tension transformer of high-frequency and high-voltage electric signal is exported through secondary end；
The control module detected to the output voltage of high-tension transformer；
Full-bridge inverting module is driven by the control of control module so that high-tension transformer stably exports high-frequency high-voltage
The drive module of signal；
The rectification unit of rectifying and wave-filtering is carried out to the output voltage of high-tension transformer；And
Circuit is detected, the constant current output after rectification is detected and reaches the progress current uniform regulation and control of sharing control unit.
2. visit water emitter according to the nuclear magnetic resonance based on array inversion charging described in claim 1, it is characterised in that
High-voltage signal after rectification unit conversion carries out electric current conversion by sampling resistor, and carries out constant current output.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720292070.8U CN206671580U (en) | 2017-03-23 | 2017-03-23 | Nuclear magnetic resonance based on array inversion charging visits water emitter |
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| CN201720292070.8U CN206671580U (en) | 2017-03-23 | 2017-03-23 | Nuclear magnetic resonance based on array inversion charging visits water emitter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106814400A (en) * | 2017-03-23 | 2017-06-09 | 吉林大学 | Water emitter and method of work are visited based on the nuclear magnetic resonance that array inversion is charged |
| CN111538096A (en) * | 2020-05-06 | 2020-08-14 | 吉林大学 | Nuclear magnetic resonance underground water stratification detection device and detection method |
-
2017
- 2017-03-23 CN CN201720292070.8U patent/CN206671580U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106814400A (en) * | 2017-03-23 | 2017-06-09 | 吉林大学 | Water emitter and method of work are visited based on the nuclear magnetic resonance that array inversion is charged |
| CN106814400B (en) * | 2017-03-23 | 2019-03-19 | 吉林大学 | Nuclear magnetic resonance based on array inversion charging visits water emitter and working method |
| CN111538096A (en) * | 2020-05-06 | 2020-08-14 | 吉林大学 | Nuclear magnetic resonance underground water stratification detection device and detection method |
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