CN106772627A - Wideband intellectuality long period crustal magnetotelluric measurement system - Google Patents
Wideband intellectuality long period crustal magnetotelluric measurement system Download PDFInfo
- Publication number
- CN106772627A CN106772627A CN201611118977.9A CN201611118977A CN106772627A CN 106772627 A CN106772627 A CN 106772627A CN 201611118977 A CN201611118977 A CN 201611118977A CN 106772627 A CN106772627 A CN 106772627A
- Authority
- CN
- China
- Prior art keywords
- low
- frequency
- sensor
- wideband
- data logger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/088—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices operating with electric fields
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Electromagnetism (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
The invention discloses a kind of wideband intellectuality long period crustal magnetotelluric measurement system, including data logger, data logger distinguishes connection electrode, triaxial induction formula Magnetic Sensor and three axis fluxgate sensors by cable；Electrode is unpolarizable electrode, realizes that electric field signal is observed；Triaxial induction formula Magnetic Sensor is, along due north, due east, three Magnetic Sensors that three directions lay vertically downward, to observe 3 component high frequency magnetic field signals；Integrated three axial coil of fluxgate sensor, realizes that 3 component low frequency magnetic fields are observed；Data logger carries out high precision collecting storage to electrode, triaxial induction formula Magnetic Sensor and three axis fluxgate sensor voltage output signals；Data logger is provided with multigroup lead-acid battery and connects solar panels, and multigroup lead-acid battery is in parallel for data logger is powered；Solar panels charge for multigroup lead-acid battery.The present invention towards long period Magnetotelluric station construction demand, with wideband, low noise, low-power consumption, intelligentized feature.
Description
Technical field
The present invention relates to a kind of wideband intellectuality long period crustal magnetotelluric measurement system, belong to the field of magnetotelluric method
Observation equipment, for the low noise intellectuality long period collection of Magnetotelluric signal.
Background technology
Magnetotelluric method is one of branching method of geophysics electrical method exploration, belongs to frequency domain passive source method.It is logical
Cross and observe the electrical structure that orthogonal electromagnetic field component obtains underground different depth by data processing and inverting.The method has
The advantage that investigation depth is big, light, field work is inexpensive.
Mt（MT）One of key technology of method seeks to realize the High Accuracy Observation system of MT signals.Measurement system
System completes electromagnetic field signal wideband, multichannel, low noise, synchronization, intelligent observation under field condition.Existing MT observation systems
Tend to ripe in multichannel, synchronization aspects.
The MTU series of existing matured product such as Canada Phoenix, the ADU of Germany Metronix are serial, U.S. KMS
820 series, by induction type magnetic sensor, are capable of achieving the MT signals observation of 0.5mHz to 320Hz frequency ranges.Long period instrument such as crow
The LEMI-417 that Crane LVIV is developed realizes that 0.03mHz-0.1Hz frequency range long period MT signals are observed by fluxgate sensor.
KMS820 can realize that inductosyn realizes the wideband MT observations of 0.03mHz -1000Hz with the combination of fluxgate sensor.
The country not yet has can realize the MT instruments of 0.03mHz -1000Hz frequency range full frequency bands.
Existing MT instruments also have the following disadvantages：1）There is 1/f noise in terms of low-frequency noise, low frequency signal to noise ratio is low；2）
Intelligence degree is not high, and power consumption is larger, is unfavorable for instrument longtime running several months under conditions of unattended；3）Do not support online
Data are downloaded, and existing instrument storage device is generally CF cards or SD card, and data need power-off to pull out card when deriving, it is meant that must stop
Only data acquisition, this shortcoming limits macrocyclic uninterrupted sampling.
The content of the invention
In order to overcome the shortcomings of existing MT measuring systems in terms of frequency band, noise, power consumption, intelligence degree, the present invention
A kind of wideband intellectuality long period crustal magnetotelluric measurement system is provided, towards long period Magnetotelluric station construction demand,
With wideband, low noise, low-power consumption, intelligentized feature.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of present invention wideband intellectuality long period crustal magnetotelluric measurement system, the measuring system by data logger, electrode,
Triaxial induction formula Magnetic Sensor, three axis fluxgate sensors, solar panels, multigroup lead-acid battery and cable composition；Data are remembered
Record device distinguishes connection electrode, triaxial induction formula Magnetic Sensor and three axis fluxgate sensors by cable；Electrode is passed as electric field
Sensor, is unpolarizable electrode, realizes that electric field signal is observed；Triaxial induction formula Magnetic Sensor is along due north, due east, vertically downward three
Three Magnetic Sensors that individual direction lays, observe 3 component high frequency magnetic field signals；Integrated three axial coil of fluxgate sensor, realizes 3
Component low frequency magnetic field is observed；Data logger is defeated to electrode, triaxial induction formula Magnetic Sensor and three axis fluxgate sensor voltages
Going out signal carries out high precision collecting storage；Data logger is provided with multigroup lead-acid battery and connects solar panels, multigroup plumbic acid
Cell parallel is powered for data logger；Solar panels charge for multigroup lead-acid battery.
Data logger by the passage chopper amplifier of front end 8, analog-digital converter ADC, FPGA, MCU, MCXO, SD card, RTC,
Power circuit, GPS module, gsm module and WIFI module composition；
The passage chopper amplifier of front end 8 completes 8 channel signal low noise amplifications of electromagnetic sensor output, and signal enters to amplify laggard
Enter analog-digital converter ADC, realize quantization encoding；FPGA carries out layout combination, and recording time information after reading 8 road adc datas,
Notify MCU reading data flows；MCU writes SD card after reading FPGA data stream；MCXO is low-power consumption high stability crystal oscillator, is circuit work
High accuracy real-time clock is provided；RTC is real-time clock (RTC), is that system keeps clock information；GPS module provides the standard time for circuit, and
PPS is provided, many synchronous acquisitions of instrument are realized；Gsm module provides Short Message Service, and MCU is in predetermined time interval
The user for specifying sends short message, while receiving User Status search request；WIFI module provides Network communication service, user terminal
Instrument is accessed by WIFI, parameter configuration, data download, status inquiry is realized；Power circuit is by cell voltage to each module electricity
Source voltage carries out efficient low noise conversion.
The electrode is according to the orthogonal laying in all directions direction, Bei Nan composition electric field Ex components, Ey points of thing composition electric field
Amount, electrode is buried to underground；Triaxial induction formula Magnetic Sensor is along due north, vertically downward due east, lay three of three directions
Magnetic Sensor, and keep level to imbed to underground, prevent pneumatic manufacture to sensor from disturbing；Fluxgate sensor imbeds underground
When, carry out leveling by horizontal bubble and keep x-axis in the same direction with north orientation；Data logger accesses sensor according to predetermined sampling
Rate and gain carry out data acquisition；GPS time information is obtained before data logger work and to clock, be capable of achieving many observation systems
Synchronous acquisition.
Terminal PC is connected by WIFI with data logger, sets gain, sample rate, filter parameter, data logger
After to clock, data acquisition, storage are carried out according to predetermined parameter, status information is collected and sent by gsm module；Collection is certain
After time, by WIFI downloading datas, during downloading data, collection runs without interruption.
Multigroup independent lead-acid battery is in parallel by ideal diode, realizes the power supply to power circuit；Many Battery packs are only
Vertical work, a certain Battery pack voltage is low or do not interfere with other Battery pack regular pictures during failure；When changing battery, by voltage
Low battery is changed, and instrument will not be affected by it and power down, it is ensured that instrument uninterrupted power supply；Ideal diode has unilateal conduction
While characteristic, voltage difference is about 10mV；This feature improves the flexibility of system power supply, battery electric quantity loss is reduced.
Chopper amplifier is sent out by modulator, audio-frequency amplifier, differential amplifier, demodulator, low pass filter and clock
Raw device composition；Clock generator is modulator, demodulator provides synchronizing clock signals, and clock frequency is 20kHz；Modulator when
The control of clock signal declines input signal and is chopped into 20kHz square-wave signals, and input signal is modulated；Audio-frequency amplifier is to 20kHz side
Ripple small-signal carries out low noise amplification, and audio-frequency amplifier band noise near 20kHz is about 2nV/rt (Hz)；Differential amplifier
Signal after amplification is carried out into single-ended transfer difference, demodulator is driven；Demodulator is carried out under synchronised clock control to differential wave
Demodulation；Low pass filter suppresses high frequency clock feedthrough Misadjustment noise signal, and step low-pass, corner frequency is 2kHz；Audio is amplified
Device can carry out Gain tuning under external control, realize programmable automation controller.
1,8,64,512 times of chopper amplifier gain is adjustable, and background noise level is about 5nV/rt when gain is 64 times
(Hz), low-frequency noise is flat, single channel power consumption 2mA；ADC is 24 delta-sigma adcs, and dynamic range reaches 120dB@(fs=
2400Hz), sample rate 2400Hz, 150Hz, 15Hz can set, single channel power consumption 5mA；FPGA is low-power consumption MAX X series, is had
The feature of low-power consumption；MCU working frequencies are ST low-power consumption STM32 controllers, working frequency 72MHz；SD card is technical grade temperature wide
Product, memory space 32GB；MCXO is digital compensation crystal oscillator, and frequency stability reaches 10ppb, and operating current is less than 3mA, and frequency is
12.288MHz；GPS module is Ublox-6T modules, the feature with high accuracy PPS, low-power consumption；WIFI module is supported without line number
According to transmission；During data acquisition, GPS module, gsm module, WIFI module power supply most times are in a dormant state.
The electrode typical case drift is 10uV/day；Induction type magnetic working sensor bandwidth 0.5mHz-1000Hz, Dan Zhichuan
Sensor power consumption is about 100mW, and background noise level is 0.1pT/rt (Hz)@1Hz；Fluxgate sensor bandwidth of operation is DC-
0.1Hz, magnetic sensor power consumption is about 200mW, and background noise level is 5pT/rt (Hz)@1Hz.
The present invention can reach following effect：
1st, wideband：Existing induction type magnetic sensor effective band is up to 0.5m Hz-1000Hz, fluxgate sensor effective band
Up to 0.03mHz-0.1Hz, by integrated two kinds of sensors, the axle induction type magnetic sensor of simultaneous observation 3 and 3 axis fluxgates are sensed
Device is exported, and realizes the magnetic field signal observation in 0.03mHz-1000Hz frequency band ranges.
2nd, low noise：Pre-amplification circuit is built using low-noise amplifier more than existing instrument electric field channel, the amplifier
Best effort frequency range be located at audio section, still suffer from typical 1/f noises in low-frequency range, noise power increases with frequency reduction
Plus.The present invention uses chopper amplification technology, realizes that Low Frequency Low Noise amplifies, and best effort frequency range is DC-1000Hz, can be effective
Elimination 1/f noises.
3rd, low-power consumption：Existing crustal magnetotelluric measurement system power dissipation is about 10W, and the lead-acid accumulator of external 60Ah can continuous work
Make 2-3 days, when long period MT observations are applied, then need frequently more to renew battery, on the one hand improve human cost, on the other hand
Reduce the reliability of instrument.Using Low-power Technology, Overall Power Consumption is reduced within 1W, extends out 3 blocks of lead of 60Ah
Acid accumulator, 3 pieces of separate automatic switchovers of battery, and solar charging panel is extended, realize that the instrument several months continuously works.
4th, it is intelligent：By GSM mechanicss of communication, instrument integration GSM communication modules, status information is sent out in timing to instrument daily
In delivering to the user terminal specified, status information includes instrument ID, gps coordinate, cell voltage, the quality of data, collection progress, deposits
The information such as storage space, user judges instrument health condition according to status information.Can also support that user is carried out at any time to instrument state
Inquiry.The program greatly reduces instrument manpower maintenance cost, reduces instrument failure risk, improves operating efficiency.By
WiFi technology, realizes that online data is quick-downloading, and completing data by pulling out card without instrument power-off downloads, and supports uninterrupted data
Collection.
Thus, the present invention is applied to wideband, low noise, low-power consumption and the intelligent solution party of long period Magnetotelluric
Case.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention.
Fig. 2 is data logger block diagram.
Fig. 3 is battery switching circuit theory diagram.
Fig. 4 is chopper amplifier theory diagram.
Specific embodiment
As shown in figure 1, a kind of wideband intellectuality long period crustal magnetotelluric measurement system, the measuring system is by data record
Device 1, electrode 2, triaxial induction formula Magnetic Sensor 3, three axis fluxgate sensors 4,5,3 groups of lead-acid batteries 6 of solar panels and electricity
Cable is constituted；Data logger distinguishes connection electrode, triaxial induction formula Magnetic Sensor and three axis fluxgate sensors by cable；Electricity
Pole, as electric-field sensor, is unpolarizable electrode, and electrode typical case's drift is 10uV/day, realizes that electric field signal is observed；Three axle senses
The formula Magnetic Sensor of answering is along due north, due east, three Magnetic Sensors that three directions lay vertically downward, observation 3 component magnetic fields letter
Number, induction type magnetic working sensor bandwidth 0.5mHz-1000Hz, single branch biosensor power consumption is about 100mW, and background noise level is
0.1pT/rt(Hz)@1Hz；Integrated three axial coil of fluxgate sensor, realizes that 3 component magnetic fields are observed；Fluxgate sensor works
With a width of DC-0.1Hz, magnetic sensor power consumption is about 200mW, and background noise level is 5pT/rt (Hz) 1Hz；Data are remembered
Record device carries out high precision collecting and deposits to electrode, triaxial induction formula Magnetic Sensor and three axis fluxgate sensor voltage output signals
Storage；Data logger is provided with multigroup lead-acid battery and connects solar panels, and multigroup lead-acid battery is in parallel for data logger is supplied
Electricity；Solar panels charge for multigroup lead-acid battery.
As shown in Fig. 2 data logger by the passage chopper amplifier of front end 8, analog-digital converter ADC, FPGA, MCU,
MCXO, SD card, RTC, power circuit, GPS module, gsm module and WIFI module composition；
The passage chopper amplifier of front end 8 completes 8 channel signal low noise amplifications of electromagnetic sensor output, and signal enters to amplify laggard
Enter analog-digital converter ADC, realize quantization encoding；FPGA carries out layout combination, and recording time information after reading 8 road adc datas,
Notify MCU reading data flows；MCU writes SD card after reading FPGA data stream；MCXO is low-power consumption high stability crystal oscillator, is circuit work
High accuracy real-time clock is provided；RTC is real-time clock (RTC), is that system keeps clock information；GPS module provides the standard time for circuit, and
PPS is provided, many synchronous acquisitions of instrument are realized；Gsm module provides Short Message Service, and MCU is in predetermined time interval
The user for specifying sends short message, while receiving User Status search request；WIFI module provides Network communication service, and user terminal leads to
Cross WIFI and access instrument, realize parameter configuration, data download, status inquiry；Power circuit is by cell voltage to each modular power source
Voltage carries out efficient low noise conversion.
As shown in figure 1, the electrode is according to the orthogonal laying in all directions direction, Bei Nan composition electric field Ex components, thing group
Into electric field Ey components, electrode is buried to underground；Triaxial induction formula Magnetic Sensor is along due north, vertically downward due east, three directions
Three Magnetic Sensors for laying, and keep level to imbed to underground, prevent pneumatic manufacture to sensor from disturbing；Fluxgate sensor
During embedment underground, carry out leveling by horizontal bubble and keep x-axis in the same direction with north orientation；Data logger accesses sensor according to pre-
Fixed sample rate and gain carry out data acquisition；GPS time information is obtained before data logger work and to clock, be capable of achieving many
Observation system synchronous acquisition.
Terminal PC is connected by WIFI with data logger, sets gain, sample rate, filter parameter, data logger
After to clock, data acquisition, storage are carried out according to predetermined parameter, status information is collected and sent by gsm module；Collection is certain
After time, by WIFI downloading datas, during downloading data, collection runs without interruption.
As shown in figure 3, three groups of lead-acid batteries of independence are in parallel by ideal diode, the power supply to power circuit is realized；
Many Battery packs work independently, and a certain Battery pack voltage is low or do not interfere with other Battery pack regular pictures during failure；Change electricity
Chi Shi, the low battery of voltage is changed, and instrument will not be affected by it and power down, it is ensured that instrument uninterrupted power supply；Ideal diode
While with unilateal conduction characteristic, voltage difference is about 10mV；This feature improves the flexibility of system power supply, battery is reduced
Kwh loss.
As shown in figure 4, chopper amplifier is by modulator, audio-frequency amplifier, differential amplifier, demodulator, low pass filter
And clock generator composition；Clock generator is modulator, demodulator provides synchronizing clock signals, and clock frequency is 20kHz；
Modulator declines input signal and is chopped into 20kHz square-wave signals in clock signal control, and input signal is modulated；Audio-frequency amplifier
Low noise amplification is carried out to 20kHz square waves small-signal, audio-frequency amplifier band noise near 20kHz is about 2nV/rt (Hz)；
Signal after amplification is carried out single-ended transfer difference by differential amplifier, drives demodulator；Demodulator is under synchronised clock control to difference
Dynamic signal is demodulated；Low pass filter suppresses high frequency clock feedthrough Misadjustment noise signal, step low-pass, and corner frequency is
2kHz；Audio-frequency amplifier can carry out Gain tuning under external control, realize programmable automation controller.
1,8,64,512 times of chopper amplifier gain is adjustable, and background noise level is about 5nV/rt when gain is 64 times
(Hz), low-frequency noise is flat, single channel power consumption 2mA；ADC is 24 delta-sigma adcs, and dynamic range reaches 120dB@(fs=
2400Hz), sample rate 2400Hz, 150Hz, 15Hz can set, single channel power consumption 5mA；FPGA is low-power consumption MAX X series, is had
The feature of low-power consumption；MCU working frequencies are ST low-power consumption STM32 controllers, working frequency 72MHz；SD card is technical grade temperature wide
Product, memory space 32GB；MCXO is digital compensation crystal oscillator, and frequency stability reaches 10ppb, and operating current is less than 3mA, and frequency is
12.288MHz；GPS module is Ublox-6T modules, the feature with high accuracy PPS, low-power consumption；WIFI module is supported without line number
According to transmission；During data acquisition, GPS module, gsm module, WIFI module power supply most times are in a dormant state.
The present embodiment wideband intellectuality long period crustal magnetotelluric measurement system the key technical indexes：
Port number：8（Ex、Ey、Bx、By、Bz、Hx、Hy、Hz）；
Bandwidth：DC——1kHz；
Power consumption：Less than 1000mW；
Noise level：Electric road：Better than 5nV/rt (Hz)@full frequency bands, induction type magnetic sensor：0.1pT/rt (Hz)@1Hz, magnetic flux
Door sensor：5pT/rt(Hz)@1Hz；
Sample rate：2400Hz, 150Hz, 15Hz are optional；
Gain：1st, 8,64,512 is optional；
Time synchronized：Less than 10us；
Memory space：32GB；
Stream time：More than 3 months；
Other：Support WIFI data transfers, support GSM status inquiries；
Thus, the present invention can reach following effect：
1st, wideband：Existing induction type magnetic sensor effective band is up to 0.5m Hz-1000Hz, fluxgate sensor effective band
Up to 0.03mHz-0.1Hz, by integrated two kinds of sensors, the axle induction type magnetic sensor of simultaneous observation 3 and 3 axis fluxgates are sensed
Device is exported, and realizes the magnetic field signal observation in 0.03mHz-1000Hz frequency band ranges.
2nd, low noise：Pre-amplification circuit is built using low-noise amplifier more than existing instrument electric field channel, the amplifier
Best effort frequency range be located at audio section, still suffer from typical 1/f noises in low-frequency range, noise power increases with frequency reduction
Plus.The present invention uses chopper amplification technology, realizes that Low Frequency Low Noise amplifies, and best effort frequency range is DC-1000Hz, can be effective
Elimination 1/f noises.
3rd, low-power consumption：Existing crustal magnetotelluric measurement system power dissipation is about 10W, and the lead-acid accumulator of external 60Ah can continuous work
Make 2-3 days, when long period MT observations are applied, then need frequently more to renew battery, on the one hand improve human cost, on the other hand
Reduce the reliability of instrument.Using Low-power Technology, Overall Power Consumption is reduced within 1W, extends out 3 blocks of lead of 60Ah
Acid accumulator, 3 pieces of separate automatic switchovers of battery, and solar charging panel is extended, realize that the instrument several months continuously works.
4th, it is intelligent：By GSM mechanicss of communication, instrument integration GSM communication modules, status information is sent out in timing to instrument daily
In delivering to the user terminal specified, status information includes instrument ID, gps coordinate, cell voltage, the quality of data, collection progress, deposits
The information such as storage space, user judges instrument health condition according to status information.Can also support that user is carried out at any time to instrument state
Inquiry.The program greatly reduces instrument manpower maintenance cost, reduces instrument failure risk, improves operating efficiency.By
WiFi technology, realizes that online data is quick-downloading, and completing data by pulling out card without instrument power-off downloads, and supports uninterrupted data
Collection.
Wideband, low noise, low-power consumption and intelligent solution suitable for long period Magnetotelluric.
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and simultaneously
The non-restriction to implementation method.For those of ordinary skill in the field, can also do on the basis of the above description
Go out the change or variation of other multi-forms.There is no need and unable to be exhaustive to all of implementation method.And thus drawn
Obvious change that Shen goes out or among changing still in protection scope of the present invention.
Claims (8)
1. a kind of wideband intellectuality long period crustal magnetotelluric measurement system, it is characterised in that：The measuring system is by data record
Device, electrode, triaxial induction formula Magnetic Sensor, three axis fluxgate sensors, solar panels, multigroup lead-acid battery and cable group
Into；Data logger distinguishes connection electrode, triaxial induction formula Magnetic Sensor and three axis fluxgate sensors by cable；Electrode is made
It is electric-field sensor, is unpolarizable electrode, realizes that electric field signal is observed；Triaxial induction formula Magnetic Sensor is along due north, due east, hangs down
Three Magnetic Sensors that straight downward three directions lay, observe 3 component high frequency magnetic field signals；Integrated three axis of fluxgate sensor
Circle, realizes that 3 component low frequency magnetic fields are observed；Data logger is sensed to electrode, triaxial induction formula Magnetic Sensor and three axis fluxgates
Device voltage output signal carries out high precision collecting storage；Data logger is provided with multigroup lead-acid battery and connects solar panels,
Multigroup lead-acid battery is in parallel for data logger is powered；Solar panels charge for multigroup lead-acid battery.
2. wideband as claimed in claim 1 intellectuality long period crustal magnetotelluric measurement system, it is characterised in that：Data logger
By the passage chopper amplifier of front end 8, analog-digital converter ADC, FPGA, MCU, MCXO, SD card, RTC, power circuit, GPS module,
Gsm module and WIFI module are constituted；
The passage chopper amplifier of front end 8 completes 8 channel signal low noise amplifications of electromagnetic sensor output, and signal enters to amplify laggard
Enter analog-digital converter ADC, realize quantization encoding；FPGA carries out layout combination, and recording time information after reading 8 road adc datas,
Notify MCU reading data flows；MCU writes SD card after reading FPGA data stream；MCXO is low-power consumption high stability crystal oscillator, is circuit work
High accuracy real-time clock is provided；RTC is real-time clock (RTC), is that system keeps clock information；GPS module provides the standard time for circuit, and
PPS is provided, many synchronous acquisitions of instrument are realized；Gsm module provides Short Message Service, and MCU is in predetermined time interval
The user for specifying sends short message, while receiving User Status search request；WIFI module provides Network communication service, and user terminal leads to
Cross WIFI and access instrument, realize parameter configuration, data download, status inquiry；Power circuit is by cell voltage to each modular power source
Voltage carries out efficient low noise conversion.
3. wideband as claimed in claim 2 intellectuality long period crustal magnetotelluric measurement system, it is characterised in that：The electrode is pressed
According to the orthogonal laying in all directions direction, Bei Nan composition electric field Ex components, thing composition electric field Ey components, electrode is buried to underground；
Triaxial induction formula Magnetic Sensor is, along due north, due east, three Magnetic Sensors that three directions lay vertically downward, and to keep level
Embedment prevents pneumatic manufacture to sensor from disturbing to underground；During fluxgate sensor embedment underground, adjusted by horizontal bubble
Put down and keep x-axis in the same direction with north orientation；Data logger accesses sensor and enters according to predetermined sample rate, filter parameter and gain
Row data acquisition；GPS time information is obtained before data logger work and to clock, be capable of achieving many observation system synchronous acquisitions.
4. wideband as claimed in claim 3 intellectuality long period crustal magnetotelluric measurement system, it is characterised in that：User terminal
（Such as PC）It is connected with data logger by WIFI, gain, sample rate, filter parameter is set, after data logger is to clock,
Data acquisition, storage are carried out according to predetermined parameter, status information is collected and sent by gsm module；After collection certain hour,
By WIFI downloading datas, during downloading data, collection runs without interruption.
5. wideband as claimed in claim 4 intellectuality long period crustal magnetotelluric measurement system, it is characterised in that：It is multigroup independent
Lead-acid battery is in parallel by ideal diode, realizes the power supply to power circuit；Many Battery packs work independently, a certain Battery pack electricity
Force down or do not interfere with other Battery pack regular pictures during failure；When changing battery, the low battery of voltage is changed, instrument is not
Can be affected by it and power down, it is ensured that instrument uninterrupted power supply；While ideal diode has unilateal conduction characteristic, electrical current
Voltage difference is only 10mV during for 1A；This feature improves the flexibility of system power supply, battery electric quantity loss is reduced.
6. wideband as claimed in claim 5 intellectuality long period crustal magnetotelluric measurement system, it is characterised in that：Chopper amplifier
It is made up of modulator, audio-frequency amplifier, differential amplifier, demodulator, low pass filter and clock generator；Clock generator
For modulator, demodulator provide synchronizing clock signals, clock frequency is 20kHz；Modulator declines input in clock signal control
Signal is chopped into 20kHz square-wave signals, and input signal is modulated；Audio-frequency amplifier carries out low noise to 20kHz square waves small-signal
Amplify, audio-frequency amplifier band noise near 20kHz is about 2nV/rt (Hz)；Differential amplifier carries out the signal after amplification
Single-ended transfer difference, drives demodulator；Demodulator is demodulated under synchronised clock control to differential wave；Low pass filter suppresses
High frequency clock feedthrough Misadjustment noise signal, step low-pass, corner frequency is 2kHz；Audio-frequency amplifier can be carried out under external control
Gain tuning, realizes programmable automation controller.
7. wideband as claimed in claim 6 intellectuality long period crustal magnetotelluric measurement system, it is characterised in that：Chopper amplifier
1,8,64,512 times of gain is adjustable, and background noise level is about 5nV/rt (Hz) when gain is 64 times, and low-frequency noise is flat, single-pass
Road power consumption 2mA；ADC be 24 delta-sigma adcs, dynamic range reach 120dB@(fs=2400Hz), sample rate 2400Hz,
150Hz, 15Hz can set, single channel power consumption 5mA；FPGA is the series of low-power consumption MAX 10, the feature with low-power consumption；MCU works
Frequency is ST low-power consumption STM32 controllers, working frequency 72MHz；SD card is technical grade temperature product wide, memory space 32GB；
MCXO is digital compensation crystal oscillator, and frequency stability reaches 10ppb, and operating current is less than 3mA, and frequency is 12.288MHz；GPS module
It is Ublox-6T modules, the feature with high accuracy PPS, low-power consumption；WIFI module supports Wireless Data Transmission；Data acquisition
When, GPS module, gsm module, WIFI module power supply most times are in a dormant state.
8. claim 1-7 it is any as described in wideband intellectuality long period crustal magnetotelluric measurement system, it is characterised in that：Institute
It is 10uV/day to state electrode typical case's drift；Induction type magnetic working sensor bandwidth 1mHz-1000Hz, single branch biosensor power consumption is about
100mW, background noise level is 0.1pT/rt (Hz)@1Hz；Fluxgate sensor bandwidth of operation is DC-0.1Hz, and three axle magnetic are passed
Sensor power consumption is about 200mW, and background noise level is 5pT/rt (Hz)@1Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611118977.9A CN106772627B (en) | 2016-12-08 | 2016-12-08 | Wideband intelligence long period crustal magnetotelluric measurement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611118977.9A CN106772627B (en) | 2016-12-08 | 2016-12-08 | Wideband intelligence long period crustal magnetotelluric measurement system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106772627A true CN106772627A (en) | 2017-05-31 |
| CN106772627B CN106772627B (en) | 2019-02-05 |
Family
ID=58881247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611118977.9A Active CN106772627B (en) | 2016-12-08 | 2016-12-08 | Wideband intelligence long period crustal magnetotelluric measurement system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106772627B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108594315A (en) * | 2018-04-20 | 2018-09-28 | 江苏省地震局 | Electromagnetism of Earthquake disturbance observation system and observation procedure based on induction type magnetic sensor |
| CN108802833A (en) * | 2018-06-27 | 2018-11-13 | 中国地质大学（北京） | Seabed flight node electro-magnetic receiver |
| CN109649670A (en) * | 2018-12-21 | 2019-04-19 | 山西省煤炭地质物探测绘院 | A kind of unmanned helicopter aeroelectromagnetic method detection system |
| CN109752768A (en) * | 2019-01-14 | 2019-05-14 | 上海艾都能源科技有限公司 | The electric earth magnetism high density dot matrix measurement acquisition big data system in solar powered field ground |
| CN117200909A (en) * | 2023-11-06 | 2023-12-08 | 江西红声技术有限公司 | Throwing type electromagnetic signal monitoring device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858988A (en) * | 2009-04-08 | 2010-10-13 | 中国石油天然气集团公司 | Magneto-electrotelluric signal collection method and device |
| CN104375191A (en) * | 2014-12-08 | 2015-02-25 | 中国石油天然气集团公司 | Magnetotelluric data acquisition system and method |
| CN104698407A (en) * | 2015-03-06 | 2015-06-10 | 清华大学 | Digital fluxgate magnetometer and geomagnetism measurement system |
| CN105301663A (en) * | 2015-10-23 | 2016-02-03 | 中国石油天然气集团公司 | Time-frequency electromagnetic exploration data air acquisition device and system |
-
2016
- 2016-12-08 CN CN201611118977.9A patent/CN106772627B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858988A (en) * | 2009-04-08 | 2010-10-13 | 中国石油天然气集团公司 | Magneto-electrotelluric signal collection method and device |
| CN104375191A (en) * | 2014-12-08 | 2015-02-25 | 中国石油天然气集团公司 | Magnetotelluric data acquisition system and method |
| CN104698407A (en) * | 2015-03-06 | 2015-06-10 | 清华大学 | Digital fluxgate magnetometer and geomagnetism measurement system |
| CN105301663A (en) * | 2015-10-23 | 2016-02-03 | 中国石油天然气集团公司 | Time-frequency electromagnetic exploration data air acquisition device and system |
Non-Patent Citations (2)
| Title |
|---|
| 屈栓柱 等: "超长周期大地电磁数据采集系统的设计与实现", 《电测与仪表》 * |
| 陈凯 等: "新一代陆用MT观测系统", 《物探与化探》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108594315A (en) * | 2018-04-20 | 2018-09-28 | 江苏省地震局 | Electromagnetism of Earthquake disturbance observation system and observation procedure based on induction type magnetic sensor |
| CN108802833A (en) * | 2018-06-27 | 2018-11-13 | 中国地质大学（北京） | Seabed flight node electro-magnetic receiver |
| CN109649670A (en) * | 2018-12-21 | 2019-04-19 | 山西省煤炭地质物探测绘院 | A kind of unmanned helicopter aeroelectromagnetic method detection system |
| CN109752768A (en) * | 2019-01-14 | 2019-05-14 | 上海艾都能源科技有限公司 | The electric earth magnetism high density dot matrix measurement acquisition big data system in solar powered field ground |
| CN117200909A (en) * | 2023-11-06 | 2023-12-08 | 江西红声技术有限公司 | Throwing type electromagnetic signal monitoring device |
| CN117200909B (en) * | 2023-11-06 | 2024-04-09 | 江西红声技术有限公司 | Throwing type electromagnetic signal monitoring device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106772627B (en) | 2019-02-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106772627A (en) | Wideband intellectuality long period crustal magnetotelluric measurement system | |
| CN102012525B (en) | Distribution type multi-parameter deep electromagnetic section imaging system and measuring method thereof | |
| CN101278838A (en) | Multichannel respiratory physiological signal wireless monitoring system and method | |
| CN203502602U (en) | Nuclear magnetic resonance detection device eliminating power frequency harmonic interference | |
| CN103335673A (en) | Zigbee-based multi-channel electromagnetic environment monitoring device | |
| CN103308780B (en) | Total electric field intensity of ultra-high voltage direct current power transmission line measurement mechanism and measuring method | |
| CN112987083A (en) | Node instrument state data recovery system based on LORA | |
| CN204065423U (en) | Field discrete earthquake digital recording equipment | |
| CN104459803B (en) | The natural field source electromagnetic measurement device of intelligent long period and its application method | |
| CN204359352U (en) | Bus type Micro Energy Lose stack battery information acquisition system | |
| CN110244345B (en) | Three-dimensional imaging tunnel geology advanced predictor and prediction method | |
| CN103713243A (en) | 10-V switch cabinet internal discharge detection device based on electromagnetic wave antenna receiving array | |
| CN104683038A (en) | Data through-the-earth transmission method based on sound waves | |
| CN109752768A (en) | The electric earth magnetism high density dot matrix measurement acquisition big data system in solar powered field ground | |
| CN205843808U (en) | A kind of distributed wireless monitored by infrasonic wave system | |
| CN206710499U (en) | A kind of current data harvester based on Rogowski coil | |
| CN211426816U (en) | Low-power consumption wireless seismic data recording device | |
| CN207074235U (en) | A kind of long period seismic electrical signal acquisition system | |
| CN202331083U (en) | Universal multifunctional precursor data acquirer | |
| CN211206615U (en) | Monitoring device for stray current | |
| CN205002798U (en) | Direct current electromagnetic environment monitoring system based on zigBee | |
| CN109660252A (en) | Portable meteorological measuring set signal calibration device | |
| CN103278853B (en) | A kind of Single-channel ground electric-field instrument | |
| CN209486194U (en) | A kind of modular accurately electric field instrument | |
| CN203705594U (en) | 10V switch cabinet internal discharge detector based on electromagnetic wave antenna reception array |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201217 Address after: 1403-01, 14th floor, building 2, North block, yard 65, Bajiao East Street, Shijingshan District, Beijing 100043 Patentee after: Beijing Yousai Huanyu Technology Co.,Ltd. Address before: 100083 No. 29, Haidian District, Beijing, Xueyuan Road Patentee before: China University of Geosciences (Beijing) |
|
| TR01 | Transfer of patent right |