CN203069679U - Field environment assessment device for nuclear magnetic resonance water exploration instrument - Google Patents
Field environment assessment device for nuclear magnetic resonance water exploration instrument Download PDFInfo
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- CN203069679U CN203069679U CN 201320040933 CN201320040933U CN203069679U CN 203069679 U CN203069679 U CN 203069679U CN 201320040933 CN201320040933 CN 201320040933 CN 201320040933 U CN201320040933 U CN 201320040933U CN 203069679 U CN203069679 U CN 203069679U
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Abstract
The utility model relates to a field environment assessment device for a nuclear magnetic resonance water exploration instrument. The field environment assessment device for the nuclear magnetic resonance water exploration instrument is formed in a way that a coil is connected with a host computer through a matching capacitor module, a preamplifier circuit, a band pass filter, a main amplifier, a signal conditioning circuit, an AD acquisition module, a data storage module, a one-chip microcomputer and a communication module, and the AD acquisition module is connected with the band pass filter through the one-chip microcomputer. In an area to be tested by the nuclear magnetic resonance water exploration instrument, the noise amplitude of an electromagnetic field in a frequency band is assessed in advance. If noise is over large and cannot meet requirements of the nuclear magnetic resonance water exploration instrument, the area can be judged to be unsuitable for the nuclear magnetic resonance water exploration instrument, and thus manpower, material resources and time are prevented from being wasted.
Description
Technical field
The utility model relates to a kind of open-air electromagnetic field environmental assessment device, specifically is to measure the device whether a certain regional electromagnetic field noise satisfies the request for utilization of nuclear magnetic resonance water witch.
Background technology
In recent years, water resource lacked the key factor that has become restriction China's economic development and influenced people's life, and under the situation of the general lack of water in most of area, the whole nation, nuclear magnetic resonance water detection The Application of Technology just seems particularly important.Nuclear magnetic resonance water detection technology is that most advanced, the most direct Detection Techniques of underground water source are sought in current physical prospecting field, utilize magnetic nuclear resonance method water detection to be used widely all over the world, but because NMR signal is very faint, usually tens receive volt to several thousand receive lie prostrate between, be distributed in mostly near the line of electric force and measure the place, so this method very easily is subjected to the interference of external electromagnetic field.Mainly concentrate between 1kHz ~ 3kHz because of NMR signal again, so the ambient electromagnetic field noise of 1kHz ~ 3kHz receives NMR signal and has the greatest impact, when the electromagnetic noise of this frequency band in the environment was excessive, instrument can not collect useful signal, will cause water detection work failure.
Nuclear magnetic resonance water witch whole system comprises Main Control Tank, power supply box, capacitive and emission receiving coil, and the about 200kg of equipment set weight need transport to minibus and measure the place.In the use, the staff need lay difform coil according to different test requests, and on physical features smooth ground preferably, three collaborative coils of laying of people need one hour 20 minutes at least, and point of the every measurement of instrument also will spend 40 minutes at least.Thereby, in case cause the failure of an experiment because of the electromagnetic field The noise, will waste a large amount of manpowers, material resources and time, have a strong impact on the efficient of water detection work.Whether therefore, in advance neighbourhood noise is monitored and assessed, judge and can use at a certain regional nuclear magnetic resonance water detection instrument, perhaps what time period interior can the use just becomes very important.
There are now some electromagnetic noise analysers on the market, electromagnetic field noise that can measurement space.But its range of application is high frequency or wide band magnetic signal often, can not satisfy the frequency band requirement of nuclear magnetic resonance water witch 1kHz ~ 3kHz.
Summary of the invention
The purpose of this utility model just is at the deficiencies in the prior art, and a kind of nuclear magnetic resonance water witch field environment apparatus for evaluating that is applied to is provided, and this device can be gathered the ambient electromagnetic field noise of 1kHz ~ 3kHz, and it is analyzed and assesses.
Nuclear magnetic resonance water witch field environment apparatus for evaluating, be by coil 1, be connected with host computer 11 through joining humorous capacitance module 2, pre-amplification circuit 3, bandpass filter 4, main amplifier 5, signal conditioning circuit 6, AD acquisition module 7, data memory module 8, single-chip microcomputer 9 and communication module 10 that AD acquisition module 7 connects and composes through single-chip microcomputer 9 and bandpass filter 4.
Described coil 1 is by 1mm
2Cable 34 circles are entwined 30cm ⅹ 30cm square coil, resistance ≌ 0.73R, inductance ≌ 0.82mH, equivalent area ≌ 30m
2
Described pre-amplification circuit 3 places in the shielding box.
Data are housed in the described host computer 11 preserve software 12, interpretation software 13, data software for display 14 and slave computer control software 15.
The technical scheme that the utility model adopts is: utilize coil 1 to receive the electromagnetic field noise, through pre-amplification circuit, bandpass filtering modules block and the signal conditioning circuit amplitude with noise signal conditioning to 50000 times, signal after the conditioning is sent in the data acquisition system (DAS), and by the serial communication module data are sent to host computer, realize measurement, analysis and demonstration to noise data.
Electromagnetic field noise receiving coil can adopt 1mm
2Cable is wound in square coil, and wire frame can be according to following parameter setting, and length and width are 30cm, the number of turn 34 circles.The wire frame resistance that twines out like this is about 0.73R, and inductance is about 0.82mH, and equivalent area is about 30m
2The matter of utmost importance of pre-amplifying module design be the noise of step-down amplifier itself to the influence of signal, prevent from the process of amplifying signal, making signal-to-noise ratio degradation.At first select low noise amplifier, secondly, pre-amplification circuit is put into shielding box, reduce the interference of being introduced by pre-amplification circuit.The wideband filtration module mainly is to disturb from interference and the power frequency of electrical network in order to suppress, and the signal that the nuclear magnetic resonance water witch is gathered mainly concentrates between 1kHz ~ 3kHz, and therefore the filter module bandwidth-intensive of design is in this frequency range.In total system, adopt the low-loss stube cable, it is minimum that spurious signal that internal system produces, harmonic component etc. are dropped to.
Beneficial effect: in the zone that will test, the electromagnetic field noise amplitude in the frequency band is assessed in advance.If noise is excessive, can not satisfy the requirement of nuclear magnetic resonance water witch, just can judge that this ground is not suitable for the nuclear magnetic resonance water witch, and then can avoid manpower, material resources and waste of time.
Description of drawings
Fig. 1 is nuclear magnetic resonance water witch field environment apparatus for evaluating structured flowchart.
Fig. 2 is the software frame figure of host computer 11 in the accompanying drawing 1.
1 coil, 2 join humorous electric capacity, 3 pre-amplification circuits, 4 bandpass filter, 5 main amplifiers, 6 signal conditioning circuits, 7.AD acquisition module, 8 data memory modules, 9 single-chip microprocessor MCU, 10 communication modules, 11 host computers, 12 data are preserved, 13 analyzing and processing, 14 data show, 15 slave computers control software, 16 host computer major softwares.
Embodiment
Below in conjunction with drawings and Examples the utility model is described in further detail.
Nuclear magnetic resonance water witch field environment apparatus for evaluating, be by coil 1 warp. join humorous capacitance module 2, place pre-amplification circuit 3, bandpass filter 4, main amplifier 5, signal conditioning circuit 6, AD acquisition module 7, data memory module 8, single-chip microcomputer 9 and communication module 10 in the shielding box to be connected with host computer 11, AD acquisition module 7 connects and composes through single-chip microcomputer 9 and bandpass filter 4.
Described coil 1 is by 1mm
2Cable 34 circles are entwined 30cm ⅹ 30cm square coil, resistance ≌ 0.73R, inductance ≌ 0.82mH, equivalent area ≌ 30m
2
Data are housed in the described host computer 11 preserve software 12, interpretation software 13, data software for display 14 and slave computer control software 15.
The technical scheme that the utility model adopts is: utilize coil 1 to receive the electromagnetic field noise, through pre-amplification circuit, bandpass filtering modules block and the signal conditioning circuit amplitude with noise signal conditioning to 50000 times, signal after the conditioning is sent in the data acquisition system (DAS), and by the serial communication module data are sent to host computer, realize measurement, analysis and demonstration to noise data.
Electromagnetic field noise receiving coil can adopt 1mm
2Cable is wound in square coil, and wire frame can be according to following parameter setting, and length and width are 30cm, the number of turn 34 circles.The wire frame resistance that twines out like this is about 0.73R, and inductance is about 0.82mH, and equivalent area is about 30m
2The matter of utmost importance of pre-amplifying module design be the noise of step-down amplifier itself to the influence of signal, prevent from the process of amplifying signal, making signal-to-noise ratio degradation.At first select low noise amplifier, secondly, pre-amplification circuit is put into shielding box, reduce the interference of being introduced by pre-amplification circuit.The wideband filtration module mainly is to disturb from interference and the power frequency of electrical network in order to suppress, and the signal that the nuclear magnetic resonance water witch is gathered mainly concentrates between 1kHz ~ 3kHz, and therefore the filter module bandwidth-intensive of design is in this frequency range.In total system, adopt the low-loss stube cable, it is minimum that spurious signal that internal system produces, harmonic component etc. are dropped to.
In the course of work, environment electromagnetic noise is received by coil 1, joins humorously through joining humorous electric capacity 2, and amplifies 11 times by pre-amplification circuit 3.The bandpass filter 4 of wideband is filtered into the signal of 1kHz-3kHz with environment electromagnetic noise, and main amplifier 5 continues signal is amplified to 50000 times amplitude then, and signal is given AD acquisition module 7 after via signal conditioning circuit 6 conditionings.Data after A is stored in the data memory module 8, give host computer 11 by single-chip microprocessor MCU 9 by communication module 10 again, host computer 11 is finished control section, comprises data preservation 12, analyzing and processing 13, data demonstration 14 and 15 work of slave computer control software.Data are preserved 12 through data and are stored on the hard disk, handle 13 by analysis and calculate and compare with the value of nuclear magnetic resonance water witch requirement, and its result shows that by data 14 are shown to the staff with waveform.Slave computer control software 15 in the software is by the part of module work in the communication module 10 control host computers 11, comprise the gain of bandpass filter 4 and the setting of passband, single-chip microprocessor MCU 9 reads and writes data and setting and the control of AD acquisition module from data memory module 8.
Claims (3)
1. nuclear magnetic resonance water witch field environment apparatus for evaluating, it is characterized in that, be by coil (1) warp. join humorous capacitance module (2), pre-amplification circuit (3), bandpass filter (4), main amplifier (5), signal conditioning circuit (6), AD acquisition module (7), data memory module (8), single-chip microcomputer (9) and communication module (10) and be connected with host computer (11), AD acquisition module (7) connects and composes through single-chip microcomputer (9) and bandpass filter (4).
2. according to the described nuclear magnetic resonance water witch of claim 1 field environment apparatus for evaluating, it is characterized in that coil (1) is by 1mm
2Cable 34 circles are entwined the 30cmx30cm square coil, and resistance is 0.73R, and inductance is 0.82mH, and equivalent area is 30m
2
3. according to the described nuclear magnetic resonance water witch of claim 1 field environment apparatus for evaluating, it is characterized in that pre-amplification circuit (3) places in the shielding box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320040933 CN203069679U (en) | 2013-01-24 | 2013-01-24 | Field environment assessment device for nuclear magnetic resonance water exploration instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320040933 CN203069679U (en) | 2013-01-24 | 2013-01-24 | Field environment assessment device for nuclear magnetic resonance water exploration instrument |
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| CN203069679U true CN203069679U (en) | 2013-07-17 |
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| CN 201320040933 Expired - Fee Related CN203069679U (en) | 2013-01-24 | 2013-01-24 | Field environment assessment device for nuclear magnetic resonance water exploration instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106059520A (en) * | 2016-05-25 | 2016-10-26 | 吉林大学 | Real-time anti-saturation device and real-time anti-saturation method for amplifier in magnetic resonance water exploration system |
| CN107976591A (en) * | 2018-01-22 | 2018-05-01 | 吉林大学 | A kind of spatial noise acquisition system of portable more rotor flying systems |
-
2013
- 2013-01-24 CN CN 201320040933 patent/CN203069679U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106059520A (en) * | 2016-05-25 | 2016-10-26 | 吉林大学 | Real-time anti-saturation device and real-time anti-saturation method for amplifier in magnetic resonance water exploration system |
| CN106059520B (en) * | 2016-05-25 | 2018-07-03 | 吉林大学 | The real-time anti-saturation device of amplifier and real-time anti-saturation method in water system are visited in magnetic resonance |
| CN107976591A (en) * | 2018-01-22 | 2018-05-01 | 吉林大学 | A kind of spatial noise acquisition system of portable more rotor flying systems |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130717 Termination date: 20140124 |