CN1616987A - Collecting method and system for distributive parallel intelligent electrode potential difference signals - Google Patents
Collecting method and system for distributive parallel intelligent electrode potential difference signals Download PDFInfo
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Abstract
The present invention relates to potential difference signal acquiring method and system for distributive parallel intelligent electrodes. In certain area, several groups of intelligent electrodes comprising several work electrodes each are distributed, and each work electrode is connected to signal regulating and measuring circuit. Each intelligent electrode has its every work electrode set in one of four work states, positive supplying electrode, negative supplying electrode, common earth and sampling. Of all the work electrodes in several intelligent electrodes, only three are in positive supplying electrode, negative supplying electrode and common earth state separately while the others being in potential difference signal sampling state. During the powering process, the natural field, primary field and secondary field of all the electrodes are measured and the potential difference signals are A/D converted and fed to computer for saving and processing circularly.
Description
Technical field:
The invention belongs to the geophysical exploration technology field, be applied to the D.C. method technology in the resource and environment exploration engineering field specifically.
Background technology:
Since 19 beginnings of the century just began to look for the ore deposit with electrical method, the D.C. method technical development nearly 200 years.Since the high-density electric technical development eighties in 20th century, the resistivity prospecting technology is developed rapidly and widespread use.The D.C. method technology is mainly based on four kinds of methods of high-density electric: 1. high-density resistivity method (high density resistivity method)---it adopts three normal sondes, comprise winner four utmost points, dipole, differential three-pole device, in conjunction with computer technology, can be widely used in the place geologic examination, the dam foundation and bridge pier addressing etc., be leading at present resistivity prospecting technology, but data acquisition still is serial.2. high-resolution resistivity (high resolution resistivity method)---originally this method is used to survey the hole body of military aspect, after be applied to underground holes such as surveying abandoned mine tunnel, karst.3. induced polarization method (IP)---it is most widely used and the best class resistivity prospecting method of effect, is obtaining obvious effects aspect water detection, the oil prospecting.But the instrument in-site measurement needs long-time observation.4. spectral induced polarization method (SIP)---claim complex resistivity method again, obtaining tangible prospecting result aspect metalliferous deposit and the oil gas prospecting, but the evaluation that swashs the separating of electrical effect and galvanomagnetic effect, induced polarization anomaly is solved fully.
High-density electric instrument has been realized the disposable cloth utmost point at present, realizes multiple combination of electrodes serial metering system automatically by electrode conversion device; But each can only have the pair of electrodes measuring voltage to electrode power supply, and other electrodes are in idle condition, and the real data gatherer process needs a large amount of time to go to wait for the circulation of supplying measure process successively.Existing electrode converter does not solve the parallel acquisition mode (93107832.6) of array electrical method.
According to the deficiency that prior art exists,, wish to accomplish the power supply of two utmost points to data collecting way by high density electrical, all electrode synchro measures, realizing parallel, magnanimity, the efficient data collection of resistivity prospecting, at first is that all electrodes are synchro measure voltage all when realizing the pair of electrodes power supply.Special proposition the present invention: distributed parallel intelligent electrode acquisition system.
Summary of the invention:
The present invention adopts following technical scheme:
Collecting method and system for distributive parallel intelligent electrode potential difference signals is some groups of intelligent electrodes of cloth in certain zone, and each intelligent electrode is made up of several working electrodes, and each working electrode is connected with the signal condition metering circuit; Each intelligent electrode is set in power supply anodal (A), power supply negative pole (B), public ground (N) and (M) the four kinds of duties of sampling any one to any working electrode wherein; Some groups of intelligent electrodes with all working electrode as long as 3 electrodes are operated in power supply anodal (A), power supply negative pole (B), public ground (N) state, remain each working electrode and enter the potential difference signal sample states simultaneously; Nature field, primary field, the voltage of secondary field of each electrode of continuous coverage in A, B power supply process, potential difference signal send Computer Storage, processing after changing through A/D; Change the position of A, B, N, measure next time, so circulation.
Described Collecting method and system for distributive parallel intelligent electrode potential difference signals, each working electrode that it is characterized in that each intelligent electrode all inserts the electrode state selector switch, the sample states of each working electrode inserts signal condition, make the following low frequency signal of 30Hz transmit sampling hold circuit, be input to the A/D device again, after the A/D conversion, be input to the single-chip microcomputer storage; The The data RS-485 communication bus of storing in the single-chip microcomputer is sent to computing machine; Electrode state selector switch and A/D change-over circuit pass through Single-chip Controlling.
Collecting method and system for distributive parallel intelligent electrode potential difference signals, it is characterized in that combining of electrode state selector switch and sample circuit, when working electrode is the employing state → and access modulate circuit → sampling maintenance → A/D conversion, the potential difference (PD) between measurement and public ground electrode; Working electrode separates with sample circuit when being non-employing state automatically; The connection of intelligent electrode only needs 7 core cables such as A, B, N, working power line and data communication line, and is irrelevant with the real work number of electrodes.
Distributed parallel intelligent electrode potential difference signal acquisition system, comprise network control computing machine and 7 core cables, it is characterized in that being provided with some groups of intelligent electrodes, each intelligent electrode carries several working electrodes, each working electrode all is connected to metering circuit, each working electrode all inserts the electrode state selector switch, the sampling electric signal of each working electrode inserts signal conditioning circuit, enter sampling hold circuit again, connect multi-way switch behind the sampling hold circuit, A/D converter, the power supply of each intelligent electrode, the single-chip microcomputer working power, public ground, the data transmission 7 core cables that insert in parallel.
Described distributed parallel intelligent electrode potential difference signal acquisition system, it is characterized in that the electrode state selector switch controls each working electrode and enter four kinds of states: power supply anodal (A), power supply negative pole (B), public ground (N) and sample (M), the working electrode default conditions are sampling, and promptly working electrode links to each other with A/D converter.The electrode state selector switch is made up of three normally closed type common relays.
Described distributed parallel intelligent electrode potential difference signal acquisition system is characterized in that described each intelligent electrode has 8 working electrodes that can sample (can charged number of poles be 1～n); Stube cable is 7 heart yearns always; Has distributed nature.
It is that MAX1132, relay etc. are conventional device that the present invention selects MCS-51 series monolithic AT89C51, A/D converter circuit for use.
Holonomic system comprises network control host computer and 7 core cables, interconnects by A, B, N, RS-485 communication bus, power lead between each intelligent electrode, and links to each other with network control host computer by 7 core cables;
Described each intelligent electrode comprises single-chip microcomputer, electrode state selector switch, sampling modulate circuit, sampling hold circuit, A/D change-over circuit, data-carrier store and communicating circuit;
Each intelligent electrode carries one group of working electrode P, constitutes the electrode state selector switch by single-chip microcomputer and relay assembly, four kinds of duties of this switch Control work electrode P: power supply anodal (A), power supply negative pole (B), public ground (N) and sampling (M).
Overall formation of the present invention: its core is an intelligent electrode, can be provided with several, and it has the distributed data acquisition function.This intelligent electrode adopts single-chip microcomputer and switch combination control, and each intelligent electrode carries one group of (8) working electrode again, links to each other with other intelligent electrode and network control host computer by communication bus.
Technical scheme of the present invention: with distributed electrode state selecting switch and A/D converter combination of circuits together, 4 kinds of state: A, B, N, the M of electrode state selector switch Control work electrode; The default conditions of working electrode are sampling (M), and promptly working electrode links to each other with A/D converter all the time, then disconnect when working electrode need be in other three states and the connecting of A/D, and are directly switch on the working electrode.Because A/D has transferred on each working electrode, therefore, except that A, B, N state, each working electrode is all measured the potential difference (PD) with N at the same time, thereby has realized parallel voltage acquisition.
Working routine is at first broadcasted to all intelligent electrodes by the RS-485 communication bus by network control host computer (PC), intelligent electrode is accepted instruction, carry out the state assignment of working electrode (A, B, N, M) separately, promptly 2 electrodes are that A, B constitute artificial electric field, 1 electrode is that N constitutes public relatively electrode, other electrodes are sample states M, measure the potential difference (PD) with N.Each performs its own functions by being subjected to instruction for all electrodes under synch command, before, during and after A, B power supply power supply in the process, carry out the continuous coverage of nature field, primary field, voltage of secondary field, after the data acquisition, intelligent electrode carries out data storage, and after receiving the roll-call of network control host computer, intelligent electrode is according to protocol requirement, separately the working electrode image data of oneself is returned network control host computer, this main frame receives, stores, separates volume, calculating, real-time one-tenth figure.After this, network control host computer is prepared to broadcast next time, so circulation.
Because the effect of intelligent electrode, be equivalent to design program control hilted broadsword 4 throw switches (electrode state selector switch) and a voltage table (combination of modulate circuit, sampling hold circuit and A/D converter) on each working electrode, each working electrode can only be operated in a kind of state simultaneously.When electrode was A, B, N state, switch was thrown respectively to the anodal shelves of power supply A, power supply negative pole shelves B, public ground N, and the working electrode default conditions are thrown to voltage table for sampling M switch.Voltage table carries out continuous sampling according to the sampling instant of communication setting, is actually a time series, is equivalent to a seismic trace record of seismic prospecting; The result who needs delivers to network control host computer or indoor extraction nature field, primary field, secondary field magnitude of voltage, calculates with method for power supplying and uses.Current measurement is the work of network control host computer.
In order to reduce cost, improve the ratio of performance to price, each intelligent electrode can be with a plurality of working electrodes.Come a shared A/D converter by sampling holder, electrode of every increase only need increase by a cover electrode state selector switch and a low pass modulate circuit, and intelligent electrode of the present invention carries 8 working electrode P.
Characteristics of the present invention: described intelligent electrode adopts 8 scramblers just can constitute above engineering resistivity prospecting (environmental monitoring) instrument in thousand roads (1024 road); Realize the once parallel network electrical method acquisition system of power supply, synchronous acquisition; Can carry out the synchronous continuous voltage collection of all electrodes from natural field, primary field, secondary field; Once gather and finish all the resistivity prospecting methods of self-potential method, high-density resistivity method, high-resolution resistivity, induced polarization method, spectral induced polarization method and mise-a-la-masse method and the measurement of various type of device simultaneously; Realized the purpose that parallel, magnanimity, efficient data are gathered; For the monitoring of the electrical method of three-dimensional resistivity prospecting, engineering and environment provides hardware supported.
The present invention carries out resistivity method when once powering, induced polarization method data acquisition technology aspect has originality, changed the distributed serial acquisition pattern of modern high-density electric exploration, once power nature field, the primary field of all electrodes of parallel acquisition, the overall process of secondary field, for the electrical method inverting provides perfect data, so the present invention has profound significance to the resistivity prospecting technical development.Changed the data acquisition modes of resistivity prospecting and complete observation process of resistivity prospecting, this invention will bring huge economic benefit and social benefit in the resource and environment Exploration Domain.
Description of drawings:
Fig. 1, the system architecture synoptic diagram.1 is network control host computer, and 2 is polycore cable, and 3 is intelligent electrode, and P is one group of working electrode that intelligent electrode 3 carries, and working electrode P numbers general formula: P=8n+1～8n+8, n=0,1,2,3,4 ...
Fig. 2, intelligent electrode 3 structural drawing.2 is polycore cable, 4 is single-chip microcomputer, and 5 is A/D converter, and 6 is multicircuit switch, 7 is sampling hold circuit, 8 is the low-pass filtering modulate circuit, and 9 is the electrode state selector switch, and 10 is data-carrier store, 11 is serial line interface, 12 is power module, and 13 is working electrode interface (signal input), and 14 is toggle switch.
Fig. 3, electrode state selector switch 9 schematic diagrams.
Fig. 4, electrode state selector switch 9 circuit diagrams.
Fig. 5, tie cable cross section 2 between intelligent electrode.AB is a current supply circuit, the public ground of G (N), and P1, P2 are the 24V working power of intelligent electrode 3, D1, D2 are RS-485 communication shielded cable.
Fig. 6, A/D converter and interface circuit 5
Fig. 7, communicating circuit and serial line interface 11.
Fig. 8, signal conditioning circuit 8.
Fig. 9, sampling hold circuit 7 and multi-way switch 6 synoptic diagram.
Figure 10, voltage-stabilized power supply circuit 12.
Figure 11, toggle switch circuit 14.
Figure 12, electrode state selector switch electrical equipment synoptic diagram.
Figure 13, electrical equipment synoptic diagram such as electrode input and A/D.
Embodiment:
Fig. 1, total system is designed to network structure, by communication bus and polycore cable (being heptcable) 2 network control host computer 1 and each intelligent electrode 3 is coupled together, and utilizes the RS-485 communication bus to finish reading of control and data.System is made up of three parts: i.e. network control host computer 1 (PC), heptcable 2 and intelligent electrode 3.Network control host computer 1 is made up of notebook computer and power supply.Its major function has: (1) network control host computer 1 is checked quantity, the code of on-line intelligence electrode 3; (2) duty, the sampling instruction of main frame 1 issue all working electrode; (3) amplitude, frequency and the working method of setting with main frame 1 powered to transmitting electrode; (4) issue synchronized sampling instruction; (5) receive the data of uploading of intelligent electrode 3; (5) storage data; (6) deal with data.(7) provide 24V direct supply, as the working power of intelligent electrode 12.Notebook computer adopts visual programming software VC programming language, utilizes on communication control and the intelligent electrode 3 single-chip microcomputer to communicate and finishes the main control system function.
Polycore cable 2 (Fig. 5) is actual to be to adopt heptcable: two power cables as current supply circuit A, B wherein; Two 24V working power P1, P2 as supply intelligent electrode 3 can consider distributed power source; Two order wire D1, D2 as intelligent electrode 3 and network control host computer 1; Also has one as common ground G (N).
Electrode state selector switch 9.Any one working electrode P on the intelligent electrode 3 has four kinds of duties promptly: A power supply, B power supply, public ground N, sampling M.For the duty of each working electrode P can be set as requested, just the circuit that meets the demands must be arranged.The present invention adopt three relay switch design circuits (Fig. 3, Fig. 4), selector switch is used for determining the duty of each working electrode, each intelligent electrode 3 works in working electrode P according to the instruction of single-chip microcomputer 4: A power supply state, B power supply state, public ground N state, sample states M.Selector switch is made of a standard machinery formula relay of often opening a node a and a normally closed node b.Fig. 3 is the switch of single working electrode P.The signal input part of intelligent electrode 3 passes through three relay Q1, Q2, and the normally closed node b1 of Q3, b2, b3 directly is connected with electrode, and the signal ground of intelligent electrode 3 directly links to each other with public ground electrode N, and promptly by default, electrode is to work in sample states.Because an intelligent electrode has eight working electrode P, so have the combination of eight such conversion switch circuits (being Fig. 3, Fig. 4) in each intelligent electrode.It is the vitals of intelligent electrode 3 that electrode state is selected circuit.
Electrode duty handoff procedure is as follows: 1. A power supply state: relay Q1 adhesive, and K1 and a1 join, and power supply electrode line POWERA connects electrode POLE, and intelligent electrode 3 signal input parts and electrode POLE disconnect, and electrode works in the A power supply state.2. B power supply state: relay Q2 adhesive, K2 and a2 join, and power supply negative line POWERB connects electrode PLOE, and intelligent electrode 3 signal input parts and electrode PLOE disconnect, and electrode works in the B power supply state.State 3. publicly: relay Q3 adhesive, K3 and a3 join, and common ground COM N connects electrode PLOE, and intelligent electrode 3 signal input parts and electrode POLE disconnect, and electrode works in public ground of N state.4. M sample states: relay Q1, Q2, Q3 be not adhesive all, i.e. K1 and b1, K2 is connected with b3 (acquiescence normally off) simultaneously with b2, K3, and this moment, intelligent electrode 3 signal input parts linked to each other with electrode POLE, and electrode works in sample states (M).
Signal conditioning circuit (Fig. 8) is actual to be low-pass filter circuit 8, and this signal conditioning circuit has designed the two-stage low-pass filter circuit, the low-pass filtering of the process 50Hz of elder generation, and then by one-level 30Hz low-pass filter circuit, the following low frequency signal of remaining 30Hz; Can effectively suppress power frequency and disturb, overcome " thick " error (counting phenomenon greatly) that occurs in the test.Amplifier in the modulate circuit [U501A～U501D] is selected the LF444 operational amplifier for use, and it and single-chip microcomputer 4 circuit have adaptability preferably.For guaranteeing that circuit has stronger common mode inhibition capacity, must guarantee that resistance has good matching and consistance, therefore select for use error to be better than 1% metalfilmresistor, the CBB electric capacity or the tantalum electric capacity of overlap joint high-quality on power pins, protect the stability and the symmetry of levying positive and negative power supply simultaneously as far as possible, this is the key that guarantees the amplifying circuit performance.
Design has eight working electrode P on A/D converter circuit 5 (Fig. 6), each intelligent electrode 3 of the present invention, finishes conversion to eight tunnel analog quantitys by an A/D converter 5.Because all working electrode P carries out at synchronization during the system requirements sampling, the analog quantity that is A/D converter 5 conversions must be the analog quantity of synchronization, but A/D converter 5 electrode is one by one changed, so will on each working electrode P of A/D converter 5 front ends, add sampling hold circuit 7, and between A/D converter 5 and sampling hold circuit 7, add multi-way switch circuit 6.Intelligent electrode 3 is when work, eight working electrode P passages are sampled simultaneously, and A/D converter 5 can only be changed a paths, before not entering A/D converter 5, value (data) on each working electrode P passage should remain unchanged, so will be with the maintenance of sampling of 7 pairs of signals of sampling holder.After a channel sample was finished, the value that keeps on other passage was waited for that multi-way switch 6 is chosen and is entered A/D converter 5 behind the passage and change.
The course of work of intelligent electrode 3: intelligent electrode has two kinds of working methods: (one) specifies all intelligent electrodes 3 to form separate payment by network control host computer 1 and samples.In this case, it is transmitting electrode that network host 1 is specified two electrodes, but does not specify public ground, is public ground but specify the some working electrodes among eight working electrode P by intelligent electrode 3.(1) be the intelligent electrode of transmitting electrode for an electrode is arranged, it specifies the some electrodes in all the other seven working electrodes is public ground, and all the other six are the sampling electrode.Enter intelligent electrode 3 at synchronization by six road signals, intelligent electrode 3 is gathered this six road signal, and the value that writes down public ground electrode simultaneously is 0, and the value FFFFH of transmitting electrode.When each working electrode data acquisition finishes, specifying a working electrode in addition by intelligent electrode 3 is public ground, and gathers six road signals, the data that write down this electrode simultaneously are 0, the value FFFFH of transmitting electrode, so circulation, make seven electrodes be public ground once, intelligent electrode 3 data acquisitions finish.(2) be the intelligent electrode of transmitting electrode for there not being electrode, it is specified, and some electrodes are public ground among eight working electrode P, all the other seven electrodes are the sampling electrode, have seven road signals at synchronization and enter intelligent electrode 3, intelligent electrode is gathered this seven road signal, and to write down public ground electrode data simultaneously be 0, when all data acquisitions of each working electrode finish, specifying an electrode in addition by intelligent electrode 3 is public ground, and gather seven road signals, the data that write down this electrode simultaneously are 0, so circulation makes eight working electrodes be public ground once, and the intelligent electrode data acquisition finishes.(2) specifying two electrodes by network control host computer 1 is transmitting electrode, specifying a certain electrode simultaneously is public ground: (1) is for the intelligent electrode 3 that does not have transmitting electrode or public ground electrode, the electrode of will sampling links to each other with the intelligent electrode signal input part, link to each other with the signal ground of intelligent electrode publicly, carry out normal data acquisition.(2) for the intelligent electrode 3 that transmitting electrode or public ground electrode are arranged, except that electrode as transmitting electrode and public ground electrode, all the other sampling electrodes link to each other with the intelligent electrode signal input part, link to each other with the signal ground of intelligent electrode publicly, carry out normal data acquisition, the value that writes down public ground electrode simultaneously is 0, and the value of transmitting electrode is FFFFH.(3) when an above-mentioned data acquisition finish through after to specify another electrode by network host 1 again be public ground, carry out above-mentioned data acquisition, finish up to all electrodes circulations.Intelligent electrode working method (two) is the groundwork mode.
A/D converter 5 (Fig. 6), the MAX1132 pattern piece of selecting for use MAXIM company to produce, it is the high precision serial successive approximation type a/d C that single supply, low-power consumption, 16, list/bipolarity are changed.Its inside has tracking/guarantor treats and calibration circuit, can use inside or external reference voltage and clock.Sampling rate can reach 200ksps, minimum power consumption 7.5mA.If work in " shut " mode", electric current can be reduced to 2.5 microamperes.This ADC can be used for fields such as industrial process control, data acquisition system (DAS), portable data, medical treatment or hand-held device, system's detection.MAX1132 need squeeze into its internal displacement register with control byte from serial data input end (DIN) by clock and decide its mode of operation and start conversion.After CS step-down or once conversion (or calibration) end, first logical one that the DIN end is received is defined as the start bit (MSB) of control byte, it is all invalid to squeeze into the logical zero of DIN by clock before this arrival, and the bits per inch of DIN is according to squeezing into MAX1132 internal displacement register at the rising edge of each SCLK.It should be noted that: if before current converting, a NEW BEGINNING position is squeezed into by clock, and current conversion will be interrupted and begin new input signal collection.
MAX1132 can finish with outside or internal clocking and approach conversion one by one, but all with external clock device is moved into or shift out data under two kinds of patterns.Under the external clock pattern, the step that moves in and out and change of data is controlled by external clock.Change over clock under the internal clocking pattern is produced by the MAX1132 internal clock generator, and speed can reach 8MHz.The cycle that once conversion is finished in general requirement is the integral multiple of 8 SCLK, and MAX1132 just has short drainage pattern (24SCLK) and two kinds of mode of operations of long drainage pattern (32SCLK).During the unipolarity input, directly export binary number; Bipolarity when input, output be two's complement.MAX1132 has the delivery outlet (P0, P1, P2) of three user-programmables, and they are push-pull type CMOS output, can be used to drive multicircuit switch or PGA.These three programming ports are output as zero under default setting, and all remain unchanged during hardware or software " shut " mode", when powering on set, all by zero setting.The present invention adopts MAX1132 and single-chip microcomputer 4 to carry out the circuit (Fig. 6) of interface, is that CS is linked to each other with the P1.0 pin, and MAX1132 sheet choosing end is chosen logical by single-chip microcomputer 4 through P1.0 human hair combing waste signal; Control byte is outputed to the DIN end of ADC by the P1.1 pin of single-chip microcomputer 4; EOC reads in single-chip microcomputer 4 by the P1.2 pin from the DOUT of ADC end, and the clock sclk that reads translation data sends high-low level successively by the P1.4 pin and constitutes; The P1.3 pin is received the serial gating output SSTRB of expression MAX1132 duty, and single-chip microcomputer 4 is by the duty of P1.3 pin inquiry ADC; P0, P1, three output terminals of P2 are connected to multicircuit switch 6, the switching of control transformation passage, and the clock that approaches conversion is one by one produced by the MAX1132 internal clock generator.
Communicating circuit: n single-chip microcomputer 4 of the present invention (n represents the number of used intelligent electrode 3), a working electrode P measures and controls to n * 8, network control host computer 1 adopts notebook computer (PC) that each single-chip microcomputer 4 is managed, thereby the formation distributed network system (DNS) is carried out the optimum control of measuring.Adopt the RS-485 bus with the serial communication mode exchange message between network control host computer 1 and the single-chip microcomputer 4.Generally requiring communication distance is tens meters supreme kms.RS-485 receives/sends out device and adopts balance to drive and differential received, has the ability that suppresses common mode interference.The RS-485 receiver sensitivity can reach ± 200mV, has prolonged communication distance greatly.Under up to 100kbps speed, cable length can reach 1200M; If communication distance shortens, maximum rate can reach 10Mbps.Allow to be with a plurality of drivers and receiver on the RS-485 bus, can be used for making up multi-point communication network.The RS-485 networking has the advantages that equipment is simple, cheap, can carry out long haul communication.So in engineering project, be used widely.The present invention selects for use the MAX3088 chip as serial line interface (Fig. 7), allows 256 a receipts/device simultaneously online.
Other circuit: 1. voltage-stabilized power supply circuit (Figure 10).The work electricity consumption of whole intelligent electrode 3 all is the 24V power supply that comes from network control host computer 1, is intelligent electrode 3 power supplies by heptcable 2 (Fig. 5).Single Chip Microcomputer (SCM) system 4 use+5V power supplys, artificial circuit part use ± 15V power supply; So power supply is selected three-terminal voltage-stabilizing module: MC78L15, MC79L15, MC78L05 for use.2. memory circuit: single-chip microcomputer 4 (AT89C51) inside has only the RAM of 128KB, and the data of system acquisition are considerably beyond this numerical value, and intelligent electrode 3 must possess the temporary function of data again, so want the growth data storer.Select for use the HM62256 chip as extended memory, it is the high integrated random memory of a kind of 32K * 8.This chip pin: A14～A0 (15) is the Input Address line, is used to transmit the address coding signal that CPU sends here.D7～D0 (8) is a bidirectional data line, and D7 is a most significant digit, and D0 is a lowest order, and during operate as normal, D7～D0 is used for transmitting reading and writing data of HM62256 chip.Control line (3): OE allows output line, and CS is that sheet selects incoming line, and WE is the read write command line.2 power leads are arranged, and Vcc is+the 5V power lead that GND is a ground wire.3. latch cicuit: often need carry out arithmetical operation or logical operation in the digital circuit to binary signal, and often these signals and operation result need be preserved, need to use logical block with memory function, it promptly is trigger, total R-S, J-K, D type and four kinds of triggers of T type, commonly used to D flip-flop and T type latch and shift register in singlechip computer system, native system selects for use three 74HC377 chips as latch (D flip-flop), by they control electrode conversion of operation state; 74HC377 is the 8D trigger, AD output.CP send the trigger pulse input end, and rising edge triggers and closes number, and low level latchs.74HC377 pin of chip: D0～D7 is the data inputs; Q0～Q7 is the data outputs; CS is the sheet choosing, and low level is effective.4. 3-8 decoding scheme: intelligent electrode 3 is many because of single-chip microcomputer 4 peripheral expansion devices, and the control mouth of singlechip chip AT89C51 is not enough, so select for use the 74HC138 chip as code translator.This code translator has two groups of input signals: one group is address input end A0, A1, A2; Another group is input gating end S1, S2, S3; Also has one group of output terminal Y0～Y7.Have only an output terminal selected (for low level) at one time, change address input end and can choose different output terminals.The P2.4 of single chip computer AT 89C51, P2.5, P2.6 are connected to address input end A, B, the C of coding chip 74HC138 respectively.E1 and E2 ground connection, E3 connects+5V, makes this chip constantly in running order.Its output terminal Y0 is as the sheet choosing of A/D chip MAX1132; Y1 is as the sheet choosing of latching chip 74HC377A; Y2 is as the sheet choosing of 74HC377B; Y3 is as the sheet choosing of 74HC377C, and Y0～Y3 output is low level.As single chip computer AT 89C51 address wire P2.4, when P2.5, P2.6 are " 001 ", the Y1 mouth is output as low level makes 74HC377A effective, and in like manner, as P2.4, P2.5, when P2.6 is " 011 ", Y3 is a low level.5. toggle switch circuit (Figure 11): by the needs of network control host computer 1 communication, be necessary for each (platform) intelligent electrode 3 coding and distinguished, its method just is to use toggle switch.When its advantage is to explore each time, the address of each slave is fixed, be made the user be easy to discern which single-chip microcomputer is being worked and its particular location.And when reducing the measurement of slave number, can number in order existing intelligent electrode, thereby make the communication of principal and subordinate's machine smooth and easy.Toggle switch is connected by bus transceiver 74HC245 with single-chip microcomputer.
Claims (7)
1, Collecting method and system for distributive parallel intelligent electrode potential difference signals is some groups of intelligent electrodes of cloth in certain zone, and each intelligent electrode is made up of several working electrodes, and each working electrode is connected with the signal condition metering circuit; Each intelligent electrode is set in power supply anodal (A), power supply negative pole (B), public ground (N) and (M) the four kinds of duties of sampling any one to any working electrode wherein; Some groups of intelligent electrodes with all working electrode as long as 3 electrodes are operated in power supply anodal (A), power supply negative pole (B), public ground (N) state, remain each working electrode and enter the potential difference signal sample states simultaneously; Nature field, primary field, the voltage of secondary field of each electrode of continuous coverage in A, B power supply process, potential difference signal send Computer Storage, processing after changing through A/D; Change the position of A, B, N, measure next time, so circulation.
2, Collecting method and system for distributive parallel intelligent electrode potential difference signals according to claim 1, each working electrode that it is characterized in that each intelligent electrode all inserts the electrode state selector switch, the sample states of each working electrode inserts signal condition, make the following low frequency signal of 30Hz transmit sampling hold circuit, be input to the A/D device again, after the A/D conversion, be input to the single-chip microcomputer storage; The The data RS-485 communication bus of storing in the single-chip microcomputer is sent to computing machine; Electrode state selector switch and A/D change-over circuit pass through Single-chip Controlling.
3, Collecting method and system for distributive parallel intelligent electrode potential difference signals according to claim 1, it is characterized in that combining of electrode state selector switch and sample circuit, when working electrode is sample states → and access modulate circuit → sampling maintenance → A/D conversion, the potential difference (PD) between measurement and public ground electrode; Working electrode separates with sample circuit when being non-sample states automatically; The connection of intelligent electrode only needs 7 core cables such as A, B, N, working power line and data communication line, and is irrelevant with the real work number of electrodes.
4, distributed parallel intelligent electrode potential difference signal acquisition system, comprise network control computing machine and 7 core cables, it is characterized in that being provided with some groups of intelligent electrodes, each intelligent electrode carries several working electrodes, each working electrode all is connected to metering circuit, each working electrode all inserts the electrode state selector switch, the sampling electric signal of each working electrode inserts signal conditioning circuit, enter sampling hold circuit again, connect multi-way switch behind the sampling hold circuit, A/D converter, the power supply of each intelligent electrode, the single-chip microcomputer working power, public ground, the data transmission 7 core cables that insert in parallel.
5, distributed parallel intelligent electrode potential difference signal acquisition system according to claim 4, it is characterized in that the electrode state selector switch controls each working electrode and enter four kinds of states: power supply anodal (A), power supply negative pole (B), public ground (N) and sample (M), the working electrode default conditions are sampling, and promptly working electrode links to each other with A/D converter.The electrode state selector switch is made up of three normally closed type common relays.
6, distributed parallel intelligent electrode potential difference signal acquisition system according to claim 4 is characterized in that described each intelligent electrode has 8 working electrodes that can sample (can charged number of poles be 1～n); The stube cable bus is 7 heart yearns; Has distributed nature.
7, distributed parallel intelligent electrode potential difference signal acquisition system according to claim 4 is characterized in that the described MCS-51 of selecting for use series monolithic AT89C51, A/D converter circuit are that MAX1132, relay etc. are conventional device.
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