CN103278853B - A kind of Single-channel ground electric-field instrument - Google Patents
A kind of Single-channel ground electric-field instrument Download PDFInfo
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- CN103278853B CN103278853B CN201310143389.0A CN201310143389A CN103278853B CN 103278853 B CN103278853 B CN 103278853B CN 201310143389 A CN201310143389 A CN 201310143389A CN 103278853 B CN103278853 B CN 103278853B
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Abstract
The invention discloses a kind of Single-channel ground electric-field instrument, comprise Single-channel ground electric-field instrument room, tail bone, two externally measured electrodes, electrode cable; Single-channel ground electric-field instrument chamber interior contains acquisition module, GPS module, wireless transport module; Two externally measured electrodes are connected to data acquisition module by electrode cable, achieve single pass electric field acquisition function.The built-in low noise collecting device of the present invention, can improve the quality of data, and structure is simple, adopts multiple power consumption mode, is suitable for intensive, long period electric fields data acquisition.
Description
Technical field
The present invention relates to land Exploration Domain, be specially telluric electricity field observation technology field, land, particularly a kind of Single-channel ground electric-field instrument.
Background technology
By observing the electric field level component of natural variation, electric field signal is converted to apparent resistivity curve and phase curve, then resistivity and the one-tenth-value thickness 1/10 on each stratum is tried to achieve in inverting.It is the important method of research the earth deep structure, current electric field measurement trend adopts distributed multiple tracks simultaneous observation technology, high-power lift-off technology, synchronous wideband reception technique, achieve and once launch and can cover observation in multiple spot/multi-thread array of carrying out, and the three-dimensional that can realize area covers observation, be conducive to the quality and the field work efficiency that improve observation data.At present, the geoelectric field test instrument of main flow in the world, if GMS-07 comprehensive electromagnetic instrument, phoenix V8 Multi-functional Receiver, KMS array electric field system etc. are all comprehensive hyperchannel ground electric-field instrument, its complex structure, in addition multichannel collecting difficult wiring, need a large amount of cable, transmission speed is slow, power consumption is high, needs to be equipped with large-scale storage battery and powers, be not suitable for carrying out long-term electric field observation, expensive, every hundreds thousand of unit of platform unit price, is not suitable for concentrated type multi-channel data acquisition.
Along with the needs of field geology operation and data acquisition real-time analysis, be badly in need of a kind of low cost, low-power consumption, the Single-channel ground electric-field instrument for the earth geologic prospecting that portability is high.
Summary of the invention
In order to solve reality need, the present invention discloses a kind of Single-channel ground electric-field instrument, for the deficiencies in the prior art, provide that a kind of volume is little, structure is simple, low in energy consumption, the Single-channel ground electric-field instrument that is applicable to long period electric fields observation and concentrated type electric field measurement, meet the demand of the earth geologic prospecting.
For achieving the above object, according to a first aspect of the invention, provide a kind of Single-channel ground electric-field instrument, it comprises Single-channel ground electric-field instrument room, tail bone, electrode cable and two externally measured electrodes; Tail bone is coniform, for whole Single-channel ground electric-field instrument fixed into the soil, be positioned at below Single-channel ground electric-field instrument room, the butt end of coniform tail bone is connected with Single-channel ground electric-field instrument room by bolt, is sealed between bolt and Single-channel ground electric-field instrument room by O type circle; Single-channel ground electric-field instrument chamber interior is provided with acquisition module, GPS module and wireless transport module, acquisition module by operational amplifier, analog to digital converter, microcontroller, SD storage card form; The microcontroller (core control part) of Single-channel ground electric-field instrument is connected with GPS module by UART interface, is connected with wireless transport module by SPI interface; Electrode cable is drawn from Single-channel ground electric-field instrument chamber interior and is connected two externally measured electrodes, electrode cable is welded on the circuit board of acquisition module in Single-channel ground electric-field instrument chamber interior, achieves the electric field data acquisition function in single channel and single collection source.
Wherein, the differential signal between two externally measured electrodes is input to acquisition module circuit board as a road input signal, realizes the electric field signal collection in single channel and single collection source; In acquisition module, discharge circuit adopts differential input and output mode, and the positive signal passage identical by structure and negative signal passage are formed, and each signalling channel comprises operational amplifier and feedback resistance, makes enlargement factor adjustable according to resistance sizes.
Preferably, utilize Radio Transmission Technology Site Detection Single-channel ground electric-field instrument, be namely connected with Single-channel ground electric-field instrument internal wireless transport module by Radio Transmission Technology by computing machine; Under microprocessor controls, the data of collection are transferred to Single-channel ground electric-field instrument internal wireless transport module, and Single-channel ground electric-field instrument internal wireless transport module is sent on computing machine by Radio Transmission Technology again, carries out data quality checking on computers.
Preferably, controlled the duty of Single-channel ground electric-field instrument by described wireless transport module, when Single-channel ground electric-field instrument is in park mode, park mode power consumption: 0.8mW, power consumption: 0.1W when Single-channel ground electric-field instrument is in mode of operation; Mode of operation terminates automatically to enter park mode afterwards.
According to a second aspect of the present invention, the method for Single-channel ground electric-field instrument of the present invention is used to comprise the following steps:
(1) choose laying place and orientation, utilize tail cone to fix Single-channel ground electric-field instrument.First Single-channel ground electric-field instrument and the second Single-channel ground electric-field instrument are laid in same position, article two, cable vertically lays mutually, north as positive in the first Single-channel ground electric-field instrument two cable due south is laid, the cable of the second Single-channel ground electric-field instrument then due east Zheng Xi is laid, and realizes the mutually perpendicular direction data acquisition in same place.
(2) select the pole span between suitable first Single-channel ground electric-field instrument and the second Single-channel ground electric-field instrument, utilize cable that electrode is placed into correct position.
(3), after Single-channel ground electric-field instrument being waken up by USB interface, computing machine is utilized to connect Single-channel ground electric-field instrument wireless module.
(4) utilize wireless module that the parameters such as Single-channel ground electric-field instrument acquisition time, sampling rate are set.
(5), after Single-channel ground electric-field instrument enters acquisition state, wireless receiving real time data is utilized, verification msg.
(6), after verification msg terminates, close Single-channel ground electric-field instrument wireless module, next Single-channel ground electric-field instrument is set.
(7) after collection terminates, utilize USB interface to connect computing machine, extract data by mass-memory unit, extract after terminating and again enter park mode.
The every platform of Single-channel ground electric-field instrument cost of the present invention 1000 yuan, under equal price, can realize acquisition channel than 50: 1.
Accompanying drawing explanation
Fig. 1 is Single-channel ground electric-field instrument electronic circuit board structured flowchart of the present invention;
Fig. 2 is Single-channel ground electric-field instrument acquisition module circuit structure diagram of the present invention;
Fig. 3 is Single-channel ground electric-field instrument front end of the present invention amplifier network;
Fig. 4 is Single-channel ground electric-field instrument GPS module connecting circuit figure of the present invention;
Fig. 5 is Single-channel ground electric-field instrument wireless transport module johning knot composition of the present invention;
Fig. 6 is Single-channel ground electric-field instrument usb segment circuit structure diagram of the present invention;
Fig. 7 is that Single-channel ground electric-field instrument of the present invention extracts schematic diagram data;
Fig. 8 is Single-channel ground electric-field instrument overall schematic of the present invention;
Fig. 9 is Single-channel ground electric-field instrument cross-sectional view of the present invention;
Figure 10 is Single-channel ground electric-field instrument wirelessly transmitting data form of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
A kind of Single-channel ground electric-field instrument, comprises Single-channel ground electric-field instrument room, tail bone, electrode cable, two externally measured electrodes; Tail bone is coniform, and for whole Single-channel ground electric-field instrument fixed into the soil, be positioned at below Single-channel ground electric-field instrument room, tail bone butt end is connected with Single-channel ground electric-field instrument room by bolt, and bolt is sealed by O type circle.Battery is packed in below Single-channel ground electric-field instrument room, and electronic circuit board is fixed on above Single-channel ground electric-field instrument room; Wherein electronic circuit board is integrated with acquisition module, GPS module, wireless transport module.Electric discharge road before acquisition module comprises, analog to digital converter, microcontroller, SD storage card etc.Microcontroller is connected with GPS module respectively by UART interface, is connected with wireless transport module by SPI interface.Make it to become a complete collection composite entity, and the complete combination in whole Single-channel ground electric-field instrument room, accompanying drawing 1 is shown in by board structure of circuit block diagram; After battery and electronic circuit board are put into Single-channel ground electric-field instrument room, sealed by O type circle, make Single-channel ground electric-field instrument can all weather operations.
Wherein, in acquisition module, discharge circuit adopts differential input and output mode, and the positive signal passage identical by structure and negative signal passage are formed, and each signalling channel comprises operational amplifier and feedback resistance, makes enlargement factor adjustable according to resistance sizes.When arranging Single-channel ground electric-field instrument mode of operation, have employed park mode when not arriving acquisition time, power consumption: 0.8mW; The power consumption when normal acquisition record data: 0.1 watt, gathers and terminates automatically again to enter park mode afterwards.
The conversion that microcontroller can realize upstream or downstream control data stores, the collection of microcontroller downgoing control signal and storage, the data transmission that upload control USB interface is external, the power supply that descending control is put before comprising control, the configuration of acquisition parameter, microcontroller is connected with GPS module by UART interface simultaneously, is connected with wireless transport module by SPI interface.
Particularly, referring to shown in Fig. 1 ~ 10, is Single-channel ground electric-field instrument circuit structure diagram of the present invention and one-piece construction schematic diagram.Wherein the instruction of each Reference numeral is as follows: tail bone 6, Single-channel ground electric-field instrument room 5, battery 9, electronic circuit board 8, tail bone bolt 3, externally measured electrode 1, electrode cable 2, USB interface 7, gib screw 4, USB data line 10, computing machine 11.
In the present invention, comprise Single-channel ground electric-field instrument room, two externally measured electrodes, electrode cable, tail bones.Tail bone is coniform, and for whole Single-channel ground electric-field instrument fixed into the soil, be positioned at below Single-channel ground electric-field instrument room, tail bone butt end is connected with Single-channel ground electric-field instrument room by bolt, and bolt is sealed by O type circle.Single-channel ground electric-field instrument chamber interior contains electronic circuit board, and plate comprises acquisition module, GPS module, wireless transport module.Acquisition module is made up of operational amplifier, analog to digital converter, microcontroller, SD storage card etc.Microcontroller is connected with GPS module by UART interface, is connected with wireless transport module by SPI interface, forms a complete entirety.
As accompanying drawing 2, electric discharge road, analog to digital converter, microcontroller, SD storage card before acquisition module comprises.On single operational amplifier before the electrode signal IN+ of two externally measured electrode outputs and electrode signal IN-is connected respectively in electric discharge road, ANALGODEVICE company OPA2237 operational amplifier chip is adopted in front electric discharge road, OPA2237 chip internal is integrated with two operational amplifiers, these two operational amplifiers are by forming feedback network with chip periphery resistance R2, R3, R4, electric discharge road before forming, this circuit will be described in detail in fig. 3.Discharge back, road connection mode number converter before this, while one end of resistance R7, R8 is connected with operational amplifier the 1st end the 7th end respectively, and the 1st pin of connection mode number converter, the 2nd pin, other one end ground connection of resistance R7, R8.Analog to digital converter adopts the ADS1251 chip of TI company, the LPC2103 chip that microcontroller adopts NXP company to generate.The differential voltage signal produced between two externally measured electrodes carries out Simulation scale-up by front electric discharge road, amplified signal is converted to digital signal through ADS1251 analog to digital converter by simulating signal, and analog to digital converter adopts the max6126 chip of maxim company as analog to digital converter.Physical circuit is that max6126 the 1st pin connects electric capacity C7, electric capacity C7 other end ground connection.Max6126 the 2nd pin is connected with power vd D and electric capacity C8, C8 other end ground connection, ground connection after the 3rd, the 4 pin short circuits of max6126, connects and in resistance C10 after the 6th, the 7 pin short circuits of max6126 with R9, and C5, C11 are in parallel.Through analog to digital converter export digital signal under the control of microcontroller LPC2103 stored in SD card.MICROSD (SecureDigital) card that in data storage market, digital product extensively adopts, has unified interface, extends to 32G, capacity is large, volume is little, is applicable to long record.
Accompanying drawing 3 puts circuit connection schematic diagram before in accompanying drawing 1, front electric discharge road adopts low-noise accurate dual operational amplifier to form Single-channel ground electric-field instrument amplifying circuit, adopt ANALGODEVICE company OPA2237 operational amplifier, there is the feature of low noise, working stability.Front electric discharge road adopts differential input and output mode, and the positive signal passage identical by two structures and negative signal passage are formed, and each passage is made up of operational amplifier and feedback resistance.Wherein operational amplifier adopts OPA2237, and configuration resistance R2 is 10K, R4 be 10K, R3 is 1K, and front circuit enlargement factor is set to (R2/R3+R4/R3+1), and in order to make output difference sub-signal symmetrical, setting R2 resistance size equals R4; R2 and R4 size can be suitably adjusted according to dynamic range requirement.In order to meet low noise requirement, above-mentioned three resistance R2, R4, R3 adopt high-accuracy Low Drift Temperature metalfilmresistor.Can effectively reduce input end noise.This operational amplifier also can select encapsulation identical, the like product that noise parameters is similar.
As accompanying drawing 2, the analog to digital converter of collector adopts 4 rank ∑s-Δ type ADS1251 digital to analog converter, by three data line AD_CLK between analog to digital converter ADS1251 and microcontroller LPC2103, AD_SCLK, AD_DOUT connects, namely ADS1251 the 4th, 5, 6 pin respectively with 37 of microcontroller LPC2103, 22, 23 pin are connected, signal in AD clock and figure in data line AD_CLK is exported by microcontroller LPC2103 the 37th pin frequency division, data transmission is carried out by two data lines of AD_SCLK and AD_DOUT in Fig. 2 between ADS1251 analog to digital converter and microcontroller LPC2103, the digital signal be transferred in microcontroller LPC2103 carries out digital filtering in the microcontroller, the function of digital filtering adopts software programming to complete.Analog to digital converter ADS1251 often completes and once changes, trigger microcontroller generation once to interrupt, this interruption is become low level to realize from high level by data line AD_DOUT, after microcontroller detects the change of this level, microcontroller enters interrupt routine, in interrupt routine, the data that analog to digital converter AD1251 exports is read in internal memory.This mode not only can obtain enough dynamic ranges (> 120dB) on the basis reducing power consumption and reduced volume, can also according to the different needs of reality, its frequency-phase characteristic of dynamic conditioning.Control module adopts ARM kernel high-performance microcontroller (NXP company LPC2103), operating voltage 3.3V, other module work such as control store while completing the filtering of A/D converting digital.
As accompanying drawing 4, microcontroller is connected with GPS module by UART interface, the SR88GPS module that GPS module adopts PROGIN company to produce, and SR88 the 11st pin is connected with ceramic antenna, in order to ensure working long hours of Single-channel ground electric-field instrument, SR88 adopts built-in ceramic antenna.Ceramic antenna is attached directly in SR88 module.7th pin of SR88 is connected with light emitting diode D5 anode by resistance R31, light emitting diode D5 plus earth.When SR88 receives GPS information, under SR88 module controls, this diode is periodic flicker state, flicker cycle 1 second, and prompting Single-channel ground electric-field instrument user GPS module has been located and obtained GPS information.16th pin of SR88 is connected with power supply VBAT, and the 15th pin and resistance R5, C7 are connected, and the other one end of R5 connects power supply V_GPS, C7 other one end ground connection.SR88 the 9th pin is connected with 24 pin of microcontroller LPC2103, the 10th pin of SR88, and 12 pin are ground connection respectively.3rd pin and the 4th pin of SR88 are connected respectively to the 14th of microcontroller LPC2103, on 15 pin, the GPS information that SR88 receives is transferred in microcontroller by this two data lines, in order to realize the location of Single-channel ground electric-field instrument and accurate time service, microcontroller carries out analysis to the output information of SR88 and extracts, obtain current positional information and temporal information, and with Current GPS time information renovation microcontroller real time clock.Thus achieve the time synchronized of Single-channel ground electric-field instrument inside and the accurate location of position.
As accompanying drawing 5, microcontroller is connected with wireless transport module by SPI interface, and wireless transport module adopts JENNIC product, and product type is JN5139.Adopt zigbee wireless protocols.Wireless module is mainly used in arranging Single-channel ground electric-field instrument running parameter and check data quality, so have employed built-in ceramic type antenna, wireless transport module is connected on microcontroller LPC2103 by SPI interface.Microcontroller transfers data to JN5139 by MOSI data line, JN5139 transfers data on computing machine by wireless again, these data are used for detecting image data quality, computing machine also can will arrange the instruction such as sampling time by wireless, the parameters such as sampling rate are by being wirelessly transmitted to JN5139, and JN5139 is sent to microcontroller by MISO line.
As accompanying drawing 10, for the data layout that wireless transport module and the computer interactive of microprocessor controls use, wherein FD is the beginning mark of an information, length is the data length that this packets of information contains, microcontroller is used for the end position of judgement information, command word is used for judging the type of this information, and be command information or data message, data refer to the concrete information content.
As accompanying drawing 9, single channel battery adopts small rechargeable lithium battery, often overlaps Single-channel ground electric-field instrument cabin and installs 1 piece of cylinder type lithium battery 9.Be fixed on bottom, Single-channel ground electric-field instrument room, detect battery electric quantity state, in Single-channel ground electric-field instrument acquisition state by wireless module, periodic testing battery electricity, when electricity is lower than a certain threshold value, Single-channel ground electric-field instrument stops collection entering park mode automatically, saves electric energy.By USB interface directly for it charges.In order to long-term electric field data collection, design different mode of operations, regulate power consumption, processor adopts down trigger mode, and during without external interrupt, Single-channel ground electric-field instrument enters low-power consumption mode.Realized by ARM instruction, enter WFI (wait interrupt mode) without microcontroller when interrupting, microcontroller LPC2103 enters park mode automatically, reduces power consumption.Specific implementation, adopts LVPS, 3.3V and 5V Power supply; For reducing Power convert loss, under Single-channel ground electric-field instrument is operated in low dominant frequency environment.
As accompanying drawing 6, due to for long-term electric field data collection, according to the needs of record mass data, the data extraction module of the present invention's design is easy to operate and have very fast transmission speed.Single-channel ground electric-field instrument contains USB interface 7 and carries out high-speed data exchange with computer 11, can extract with higher velocity interpolation data.USB interface adopts MiniB type USB plug and MiniB type USB socket, saves space.Particular circuit configurations is, PL2303HX serial ports is adopted to turn USB interface chip, UTXD in Fig. 6, URXD data line is connected on the 13rd pin of microcontroller LPC2103, the 14th pin, microcontroller transmits data by PL2303HX to USB interface by these 2 data lines, and PL2303HX configures a 12M clock crystal oscillator X2 as transfer clock, each electric capacity C5 in parallel in crystal oscillator X2 two ends, C6, two electric capacity effects are the resonance frequency and the output amplitude that ensure crystal oscillator.17th pin of PL2303HX and power supply 3V3, two electric capacity C4, CP4 connect, the other end ground connection of C4, CP4.Wherein CP4, C4 effect is to ensure that circuit working is normal, at the filter capacitor that 17 pins of PL2303 connect.20th pin of PL2303HX and power supply Vusb, electric capacity CP5 connects, CP5 other end ground connection.A MiniB type USB socket is connected on PL2303HX chip by resistor network, under ensureing high-frequency clock, the stability of data transmission, between USB socket with PL2303, data line is connected two resistance R7, R8, R7 connect USB interface one end and are also connected to power supply 3V3 by resistance R6, resistance R7, R8 role prevents overshoot, ring, thus ensure impedance matching and the integrality of usb signal.
The data extraction method of Single-channel ground electric-field instrument of the present invention:
As Fig. 6 and Fig. 7:
1. after Single-channel ground electric-field instrument terminates record, open USB interface 7, held by the mini of USB transmission line and insert MiniB type USB socket, the other end is connected to computing machine, as accompanying drawing 7
2. automatic mapping goes out a mass storage device class equipment in a computer
3. open memory device, extract the data of record.
Use the specific implementation process of Single-channel ground electric-field instrument:
1. choose and lay place and orientation, utilize tail cone to fix Single-channel ground electric-field instrument.First Single-channel ground electric-field instrument and the second Single-channel ground electric-field instrument are laid in same position, article two, cable vertically lays mutually, north as positive in the first Single-channel ground electric-field instrument two cable due south is laid, the cable of the second Single-channel ground electric-field instrument then due east Zheng Xi is laid, and realizes the mutually perpendicular direction data acquisition in same place.
2. select the pole span between suitable first Single-channel ground electric-field instrument and the second Single-channel ground electric-field instrument, utilize cable that electrode is placed into correct position.
3., after Single-channel ground electric-field instrument being waken up by USB interface, utilize computing machine to connect Single-channel ground electric-field instrument wireless module.
4. utilize wireless module that the parameters such as Single-channel ground electric-field instrument acquisition time, sampling rate are set.
5., after Single-channel ground electric-field instrument enters acquisition state, utilize wireless receiving real time data, verification msg.
6., after verification msg terminates, close Single-channel ground electric-field instrument wireless module, next Single-channel ground electric-field instrument is set.
7. gather after terminating, utilize USB interface to connect computing machine, extract data by mass-memory unit, extract after terminating and again enter park mode.
The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the embodiment of the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (2)
1. a Single-channel ground electric-field instrument, comprises Single-channel ground electric-field instrument room, tail bone, electrode cable and two externally measured electrodes; Tail bone is coniform, for by whole Single-channel ground electric-field instrument fixed into the soil for the taper end of coniform tail bone, tail bone is positioned at below Single-channel ground electric-field instrument room, the butt end of coniform tail bone is connected with Single-channel ground electric-field instrument room by bolt, is sealed between bolt and Single-channel ground electric-field instrument room by O type circle; Single-channel ground electric-field instrument chamber interior is provided with acquisition module, GPS module and wireless transport module, and acquisition module is made up of operational amplifier, analog to digital converter, microcontroller, SD storage card; The microcontroller of Single-channel ground electric-field instrument is connected with GPS module by UART interface, is connected with wireless transport module by SPI interface; Electrode cable is drawn from Single-channel ground electric-field instrument chamber interior and is connected two externally measured electrodes, and electrode cable, on Single-channel ground electric-field instrument chamber interior welding acquisition module circuit board, achieves the electric field data acquisition function in single channel and single collection source;
Wherein, the differential signal between two externally measured electrodes is input to acquisition module circuit board by electrode cable as a road input signal, realizes the electric field signal collection in single channel and single collection source; In acquisition module, discharge circuit adopts differential input and output mode, and the positive signal passage identical by structure and negative signal passage are formed, and each signalling channel comprises operational amplifier and feedback resistance, makes enlargement factor adjustable according to resistance sizes;
Utilize Radio Transmission Technology Site Detection Single-channel ground electric-field instrument, namely by computing machine by Radio Transmission Technology and the wireless connections of Single-channel ground electric-field instrument Single-channel ground electric-field instrument internal wireless transport module; Under microprocessor controls, the data of collection are transferred to Single-channel ground electric-field instrument Single-channel ground electric-field instrument internal wireless transport module, Single-channel ground electric-field instrument Single-channel ground electric-field instrument internal wireless transport module is sent on computing machine by Radio Transmission Technology again, carries out data quality checking on computers;
The duty of Single-channel ground electric-field instrument is controlled by described wireless transport module, when Single-channel ground electric-field instrument is in park mode, park mode power consumption: 0.8mW, power consumption: 0.1W when Single-channel ground electric-field instrument is in mode of operation; Mode of operation terminates automatically to enter park mode afterwards;
Electric discharge road, analog to digital converter, microcontroller, SD storage card before described acquisition module comprises; On single operational amplifier before the electrode signal IN+ of two externally measured electrode outputs and electrode signal IN-is connected respectively in electric discharge road, OPA2237 operational amplifier chip is adopted in front electric discharge road, OPA2237 chip internal is integrated with two operational amplifiers, these two operational amplifiers, by forming feedback network with chip periphery resistance R2, R3, R4, form front electric discharge road; Discharge back, road connection mode number converter before this, while one end of resistance R7, R8 is connected with operational amplifier the 1st end the 7th end respectively, and the 1st pin of connection mode number converter, the 2nd pin, other one end ground connection of resistance R7, R8; Analog to digital converter adopts ADS1251 chip, and microcontroller adopts LPC2103 chip; The differential voltage signal produced between two externally measured electrodes carries out Simulation scale-up by front electric discharge road, amplified signal is converted to digital signal through ADS1251 analog to digital converter by simulating signal, and analog to digital converter adopts max6126 chip as analog to digital converter; Max6126 the 1st pin connects electric capacity C7, electric capacity C7 other end ground connection; Max6126 the 2nd pin is connected with power vd D and electric capacity C8, C8 other end ground connection, ground connection after the 3rd, the 4 pin short circuits of max6126, connects and in resistance C10 after the 6th, the 7 pin short circuits of max6126 with R9, and C5, C11 are in parallel; Through analog to digital converter export digital signal under the control of microcontroller LPC2103 stored in SD storage card.
2. use the method for the Single-channel ground electric-field instrument described in claim 1, it comprises the following steps:
(1) choose laying place and orientation, utilize tail cone to fix Single-channel ground electric-field instrument; First Single-channel ground electric-field instrument and the second Single-channel ground electric-field instrument are laid in same position, and two cables vertically lay mutually, realize the mutually perpendicular direction data acquisition in same place;
(2) select the pole span between suitable first Single-channel ground electric-field instrument and the second Single-channel ground electric-field instrument, utilize cable that electrode is placed into correct position;
(3), after Single-channel ground electric-field instrument being waken up by USB interface, computing machine is utilized to connect Single-channel ground electric-field instrument wireless module;
(4) utilize wireless module that Single-channel ground electric-field instrument acquisition time, sampling rate parameter are set;
(5), after Single-channel ground electric-field instrument enters acquisition state, wireless receiving real time data is utilized, verification msg;
(6), after verification msg terminates, close Single-channel ground electric-field instrument wireless module, next Single-channel ground electric-field instrument is set;
(7) after collection terminates, utilize USB interface to connect computing machine, extract data by mass-memory unit, extract after terminating and again enter park mode.
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| CN104502734A (en) * | 2014-12-30 | 2015-04-08 | 中国科学院电子学研究所 | Capacitive electric field sensor |
| CN108802635A (en) * | 2018-07-27 | 2018-11-13 | 成都理工大学 | A kind of Rock And Soil magnetic field sensor for landslide monitoring |
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| CN101556340A (en) * | 2008-04-10 | 2009-10-14 | 中国石油集团东方地球物理勘探有限责任公司 | Three-dimensional small surface element magnetotelluric continuous array data acquisition method |
| CN102236106A (en) * | 2010-12-28 | 2011-11-09 | 中国地质大学（北京） | Method and device for measuring resistivity of underground medium on ground and in gallery in quasi-three-dimension mode |
| CN102520451A (en) * | 2011-12-30 | 2012-06-27 | 上海艾都能源科技有限公司 | High-precision double-way ground voice frequency electromagnetic physical geography prospecting instrument |
| CN203224635U (en) * | 2013-04-24 | 2013-10-02 | 中国科学院地质与地球物理研究所 | Single channel telluric electricity field instrument |
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