CN206362943U - Water signal supervisory instrument is visited in a kind of magnetic resonance with HDR - Google Patents
Water signal supervisory instrument is visited in a kind of magnetic resonance with HDR Download PDFInfo
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- CN206362943U CN206362943U CN201720020940.6U CN201720020940U CN206362943U CN 206362943 U CN206362943 U CN 206362943U CN 201720020940 U CN201720020940 U CN 201720020940U CN 206362943 U CN206362943 U CN 206362943U
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- analog switch
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- amplifying
- circuits
- mcu control
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Abstract
The utility model is related to a kind of magnetic resonance with HDR and visits water signal supervisory instrument, is to be connected and composed by receiving coil through relay, double limiting diode, preamplifier, bandpass filter, twice amplifying circuit, four times of amplifying circuits, octuple amplifying circuit, ten times of amplifying circuits, low pass filter, ADC change-over circuits 19, PC, MCU control circuit and optical couple isolation drive circuit and relay.HDR is realized by pre-amplification circuit cascade, the requirement that noise is widely varied can be detected by meeting；Adjust disconnection and the closure of each analog switch in real time by pre-sampling adc circuit and MCU control circuit, reach the purpose of regulation gain, can effective rejective amplifier saturation；The input value of follow-up ADC change-over circuits is reached full scale as much as possible simultaneously, improve the sampling precision of signal；This method improves operating efficiency without manually operating.
Description
Technical field：
The utility model is related to a kind of apparatus for detecting weak signal, and the signal detection of water instrument is specifically visited used in nuclear magnetic resonance
Aspect.
Background technology：
Ground nuclear magnetic resonance turns into a kind of important modern times due to the ability to underground water direct detection and qualitative assessment
Geophysics groundwater prospecting method.
Apparatus for detecting weak signal based on MSP430G2553, to detect the micro- of under strong noise background given frequency
The range value of weak sine wave signal, and numerical monitor goes out the range value.It can accurately measure the frequency range 500Hz of voltage~
2KHz, voltage range 20mV~2V.Based on analog circuit, coordinate adder Module, voltage reduction module, amplification module, filtering mould
Block, phase-locked loop module, phase-shift circuit, module, multiplication module, RMS-DC converter module (AD637), A/D conversion modules, display
Module；Data processing is carried out by MSP430 single-chip microcomputers, the width of measurement is shown by NOKIA_5110 in error allowed band
Angle value.
CN1603856 is disclosed《A kind of signal supervisory instrument for nuclear magnetic resonance》, the device include signal amplifier,
One wave detector, an AD sampling A/D chip, and reference signal generation device, wherein signal amplifier and reference signal produce
Device distinguishes tie geophone, and wave detector connects AD sampling A/D chips by amplifier, and described reference signal generation device is used
Be digitization frequencies source DDS, be connected between DDS and wave detector alternative switching switch,
Because NMR signal is extremely faint, volt level is generally only received, it is necessary to could be detected by tens thousand of times of amplifications
Arrive, and easily disturbed by external environment electromagnetic noise, amplifier is easy to the saturation due to interference noise, cause magnetic resonance to visit water
Instrument can not normal work.
The content of the invention：
The utility model has HDR there is provided one kind aiming at above-mentioned the deficiencies in the prior art and can adjusted automatically
Water signal supervisory instrument is visited in the magnetic resonance of whole multiplication factor.
The utility model is achieved through the following technical solutions：
A kind of nuclear magnetic resonance with HDR visits water signal supervisory instrument, be by receiving coil 1 through relay 2,
Double limiting diode 3, preamplifier 4, bandpass filter 5, twice amplifying circuit 10, four times of amplifying circuits 12, Ba Beifang
Big circuit 14, ten times of amplifying circuits 16, low pass filter 18, ADC change-over circuits 19, PC20, MCU control circuit 8 and optocoupler every
It is connected from drive circuit 6 with relay 2, bandpass filter 5 is through analog switch 11, analog switch 13, analog switch 15 and simulation
Switch 17 is connected with low pass filter 18, and bandpass filter 5 changes electricity through pre-sampling adc circuit 7 and MCU control circuit 8 and ADC
Road 19 is connected, and twice of amplifying circuit 10, four times of amplifying circuits 12, eight times of amplifying circuit 14 and ten times of amplifying circuits 16 are corresponded to respectively
Analog switch 11, analog switch 13, analog switch 15 and analog switch 17 are connected, MCU control circuit 8 drives electricity through light-coupled isolation
Road 9 is connected and composed with analog switch 11, analog switch 13, analog switch 15 and analog switch 17 respectively.
Beneficial effect：Pass through pre-amplification circuit and twice amplifying circuit, four times of amplifying circuits, octuple amplifying circuits and ten
The cascade of times amplifying circuit realizes HDR, and the requirement that noise is widely varied can be detected by meeting；By adopting in advance
Sample adc circuit and MCU control circuit adjust disconnection and the closure of each analog switch in real time, reach the purpose of regulation gain, can
Effective rejective amplifier saturation；The input value of follow-up ADC change-over circuits is reached full scale as much as possible simultaneously, improve signal
Sampling precision；This method improves operating efficiency without manually operating.
Brief description of the drawings：
Fig. 1 is that the structured flowchart of water signal supervisory instrument is visited in the magnetic resonance of HDR.
1 receiving coil, 2 relays, 3 double limiting diodes, 4 preamplifiers, 5 bandpass filters, 6 light-coupled isolations are driven
Dynamic circuit, 7 pre-sampling adc circuits, 8MCU control circuits, 9 optical couple isolation drive circuits, 10 twice of amplifying circuit, 11 simulations are opened
Close, 12 4 times of amplifying circuits, 13 analog switches, 14 octuple amplifying circuits, 15 analog switches, 160 times of amplifying circuits, 17 simulations
Switch, 18 low pass filters, 19ADC change-over circuits, 20PC.
Embodiment：
Below in conjunction with accompanying drawing, by embodiment, the utility model is described in further detail.
A kind of nuclear magnetic resonance with HDR visits water signal supervisory instrument, be by receiving coil 1 through relay 2,
Double limiting diode 3, preamplifier 4, bandpass filter 5, twice amplifying circuit 10, four times of amplifying circuits 12, Ba Beifang
Big circuit 14, ten times of amplifying circuits 16, low pass filter 18, ADC change-over circuits 19, PC20, MCU control circuit 8 and optocoupler every
It is connected from drive circuit 6 with relay 2, bandpass filter 5 is through analog switch 11, analog switch 13, analog switch 15 and simulation
Switch 17 is connected with low pass filter 18, and bandpass filter 5 changes electricity through pre-sampling adc circuit 7 and MCU control circuit 8 and ADC
Road 19 is connected, and twice of amplifying circuit 10, four times of amplifying circuits 12, eight times of amplifying circuit 14 and ten times of amplifying circuits 16 are corresponded to respectively
Analog switch 11, analog switch 13, analog switch 15 and analog switch 17 are connected, MCU control circuit 8 drives electricity through light-coupled isolation
Road 9 is connected and composed with analog switch 11, analog switch 13, analog switch 15 and analog switch 17 respectively.
As shown in figure 1, it is by receiving coil 1 and relay that the nuclear magnetic resonance with HDR, which visits water signal supervisory instrument,
Device 2 is connected, and relay 2 is connected with double limiting diode 3, and double limiting diode 3 is connected with preamplifier 4, preceding to put
Big device 4 is connected with bandpass filter 5, and bandpass filter 5 is connected with pre-sampling adc circuit 7, and pre-sampling adc circuit 7 and MCU is controlled
Circuit 8 processed is connected, and MCU control circuit 8 is connected with optical couple isolation drive circuit 6, and optical couple isolation drive circuit 6 connects with relay 2
Connect, bandpass filter 5 is connected with twice amplifying circuit 10, analog switch 11 respectively, and twice of amplifying circuit 10 is put with four times respectively
Big circuit 12, analog switch 13 are connected, and four times of amplifying circuits 12 are connected with octuple amplifying circuit 14, analog switch 15 respectively, and eight
Times amplifying circuit 14 is connected with ten times of amplifying circuits 16, analog switch 17 respectively, ten times of amplifying circuits 16 and low pass filter 18
Connection, low pass filter 18 is connected with ADC change-over circuits 19, and ADC change-over circuits 19 are connected with PC20, twice amplifying circuit 10,
Four times of amplifying circuits 12, eight times of amplifying circuit 14 and ten times of amplifying circuits 16 are connected respectively analog switch 11, analog switch
13rd, analog switch 15 and analog switch 17, MCU control circuit 8 respectively with ADC change-over circuits 19, optical couple isolation drive circuit 9,
PC20 connections, optical couple isolation drive circuit 9 connects with analog switch 11, analog switch 13, analog switch 15, analog switch 17 respectively
Connect composition.
The work of the detection means is comprised the following steps that：
After a, system electrification, the detectable signal in receiving coil 1 enters by double limiting diode 3 and preamplifier 4
Enter bandpass filter 5 and be filtered processing；
B, pre-sampling adc circuit 7 export signal sampling value to MCU control circuit 8, judge whether signal exceedes follow-up
The maximum input amplitude of ADC change-over circuits.If exceeding, MCU control circuit 8 controls relay by optical couple isolation drive circuit 6
Device 2 disconnects；
If c, being not above, MCU control circuit 8 passes through optical couple isolation drive circuit 9 and controls analog switch 11, analog switch
13rd, the disconnection of analog switch 15 and analog switch 17 and closure automatic regulating signal multiplication factor so that whole detection circuit
The size of real-time matching input signal is capable of in gain, it is ensured that amplifier is undersaturated while improving amplifier gain；
D, adjust after the gain of whole detection circuit, MCU control circuit 8 exports a trigger signal, control ADC conversions
Circuit 19 completes an analog-to-digital conversion；
E, repetition c, Step d, until signal detection terminates；
F, signal normalization process：After signal acquisition terminates, MCU control circuit 8 uploads to gain data each time
PC20, normalized is done with the value of AD conversion, obtains the real signal value of the input of preamplifier 4.
The data of each pulse square after terminating to sampling are analyzed, and the sampled value before normalization is all in AD conversion amount
Within journey, and neither one saturation point, after inversion procedure, the underground reservoir result as well data, explanation have been obtained
The apparatus and method inhibit amplifier saturated phenomenon, and effectively obtain nuclear magnetic resonance spy water signal.
Claims (1)
1. a kind of nuclear magnetic resonance with HDR visits water signal supervisory instrument, it is characterised in that be by receiving coil (1)
Through relay (2), double limiting diode (3), preamplifier (4), bandpass filter (5), twice amplifying circuit (10), four
Times amplifying circuit (12), octuple amplifying circuit (14), ten times of amplifying circuits (16), low pass filter (18), ADC change-over circuits
(19), PC (20), MCU control circuit (8) and optical couple isolation drive circuit (6) are connected with relay (2), bandpass filter (5)
It is connected through analog switch (11), analog switch (13), analog switch (15) and analog switch (17) with low pass filter (18), band
Bandpass filter (5) is connected through pre-sampling adc circuit (7) and MCU control circuit (8) with ADC change-over circuits (19), twice of amplification electricity
Road (10), four times of amplifying circuits (12), eight times of amplifying circuit (14) and ten times of amplifying circuits (16) are connected respectively simulation and opened
(11), analog switch (13), analog switch (15) and analog switch (17) are closed, MCU control circuit (8) drives electricity through light-coupled isolation
Road (9) is connected and composed with analog switch (11), analog switch (13), analog switch (15) and analog switch (17) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720020940.6U CN206362943U (en) | 2017-01-09 | 2017-01-09 | Water signal supervisory instrument is visited in a kind of magnetic resonance with HDR |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720020940.6U CN206362943U (en) | 2017-01-09 | 2017-01-09 | Water signal supervisory instrument is visited in a kind of magnetic resonance with HDR |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206362943U true CN206362943U (en) | 2017-07-28 |
Family
ID=59380749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720020940.6U Expired - Fee Related CN206362943U (en) | 2017-01-09 | 2017-01-09 | Water signal supervisory instrument is visited in a kind of magnetic resonance with HDR |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206362943U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108152768A (en) * | 2017-11-29 | 2018-06-12 | 华东师范大学 | A kind of NMR signal acquisition processing device |
-
2017
- 2017-01-09 CN CN201720020940.6U patent/CN206362943U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108152768A (en) * | 2017-11-29 | 2018-06-12 | 华东师范大学 | A kind of NMR signal acquisition processing device |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170728 Termination date: 20180109 |
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| CF01 | Termination of patent right due to non-payment of annual fee |