CN1766597A - Electrical resistance tomography system with single electrode excitation mode - Google Patents
Electrical resistance tomography system with single electrode excitation mode Download PDFInfo
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- CN1766597A CN1766597A CN 200510016130 CN200510016130A CN1766597A CN 1766597 A CN1766597 A CN 1766597A CN 200510016130 CN200510016130 CN 200510016130 CN 200510016130 A CN200510016130 A CN 200510016130A CN 1766597 A CN1766597 A CN 1766597A
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Abstract
The invention relates to a chromatography imaging and signal processing technology. The single electrode stimulating mode resistance chromatography imaging system is mainly formed by an electrode array sensor, an electrode gating logic, signal generating, signal preprocessing handling, data collecting, logic control and computer module. The electrode array sensor module is formed by 1-16 layer electrodes; each layer arranges 16-32 electrodes, each layer electrode module has different logic addresses; the electrode gating logic module chooses each layer electrode module, the simulating, testing and out resistance value of the 16 or 32 electrodes. The signal generating module generates double polarity square wave voltage signal which is changed into double polarity square wave current signal by voltage control constant-current source. The signal preprocessing handling module preprocesses the voltage of the tested out resistance and sends the signal to the data collecting module. The computer module handles the data or rebuilds the image by inquiring mode.
Description
Technical field
The invention belongs to the detection technique field, be specifically related to a kind of tomography and signal processing technology.
Technical background
The physical basis of Electrical Resistance Tomography (ERT) technology is that different mediums have different conductivity, judges responsive the just medium of thing field distribution as can be known of distribution of conductivity.The groundwork mode that adopts is the adjacent excitation of individual layer 16 electrodes, adjacent detection mode at present.Wherein pumping signal is a sine wave AC electric current signal, and detection signal is that adjacent electrode is to last boundary voltage signal.When the internal conductance rate changes in distribution of thing field, the distribution of current field will change thereupon, causes a built-in potential changes in distribution, thereby the borderline measuring voltage of field domain also will change.Voltage on the Measured Boundary also passes through the respective imaging algorithm, can rebuild an internal conductance rate and distribute, and realizes visualization measurement.Adjacent pattern being most widely used in the traditional resistor chromatographic imaging system, this mode has begun to be used for the on-line operation in some field.But in the Electrical Resistance Tomography evolution, this mode mainly exposes 3 problems: 1. owing to do not detect driving source and three pairs of contiguous electrodes, therefore the boundary voltage data message that obtains is insufficient.According to principle of reciprocity, the valid data that one week of 16 electrode cycle detection of individual layer measures are 104.2. near the exciting current zone the exciting electrode of mainly flowing through causes distribution of current inhomogeneous, and the driving source near zone is very responsive, thereby causes the weighting coefficient of inhomogeneous medium to be difficult for given.3. the detecting electrode end lacks earth point, makes the data of detection be subject to disturbing effect.
These problems all directly or indirectly influence the performance of Electrical Resistance Tomography system.Though the researchist is accelerating to have proposed a lot of improvement and optimized Measures aspect acquisition speed, the raising system performance, as adopt parallel measurement, improve wave filter filtering time, optimization system electrode, improve imaging algorithm etc., but because the limitation of its design concept itself causes the room for promotion of acquisition speed and precision to be very restricted.This is traditional insoluble problem of Electrical Resistance Tomography system.At this problem, native system has adopted the mode of operation of single drive electrode method, carries out the hardware design of system based on the single drive electrode method pattern, has increased system's independent measurement number, has improved the real-time of system.
Summary of the invention
Problem at the existence of traditional resistor chromatographic imaging system data acquisition scheme, and problems such as the real-time of system and circuit complexity, the objective of the invention is to propose a kind of data acquisition scheme of single drive electrode method, and carried out the design of hardware system according to this pattern.
Technical scheme of the present invention is (with reference to an accompanying drawing 1～5): the single drive electrode method modular system is mainly formed (as Fig. 1) by electrod-array sensor assembly 1, electrode gating logic module 2, signal generating module 3, signal pre-processing module 4, data acquisition module 5, Logic control module 6, computer module 7 and outer meeting resistance 8.Wherein electrod-array sensor assembly 1 is made up of 1～16 layer of electrode, places 16 or 32 electrodes (as shown in Figure 2) for every layer.Every layer of electrode module has different logical addresses and enables, and selected by 2 pairs of every layer of electrode modules of electrode gating logic module.Electrode gating logic module 2 (as Fig. 3) can gating single-layer electrodes module also can the multi-layered electrode module gating simultaneously.Simultaneously electrode gating logic module 2 is selected excitation, detection and the outer meeting resistance of 16 or 32 electrodes in each layer electrode module.Signal generating module 3 produces the bipolar square wave voltage signal, converts the bipolar square wave current signal to through the voltage controlled current source in the signal generating module 3.Carry out pre-service and deliver to data acquisition module 5 (as shown in Figure 4) by the magnitude of voltage on 4 pairs of detected outer meeting resistances 8 of signal pre-processing module.The signal of signal pre-processing module 4 outputs is input in the A/D converter 16, and translation data is stored data-carrier store 17 under the control of Timer 18.Data in the data-carrier store 17 are read in by inquiry mode by computing machine 7 then, carry out data analysis or image reconstruction, the control signal that computing machine 7 provides is delivered to each module by Logic control module 6 and is controlled.Signal pre-processing module 4 and data acquisition module 5 are connected by data line, and data acquisition module 5 and Logic control module 6 are connected by control line.
The good effect that the present invention produces is: the data acquisition scheme that adopt (1) encourages every layer of 16 or 32 electrode system and can obtain 240 or 992 measurement data a week, following according to the reciprocal theorem independent data is 120 or 496,104 independent datas than present individual layer 16 electrode systems have increased by 16, have increased by 32 than 464 independent datas of individual layer 32 electrode systems.(2) the DATA REASONING pattern of Cai Yonging is for the circular pipe of individual layer 16 electrodes, and 16 electrodes all have electric current to pass through when system works, and what one of them electrode passed through is exciting current, and what all the other passed through is to detect electric current, and all detect electric current sums and equal exciting current.Because each electrode all has electric current to pass through, this just makes detected electrorheological get evenly, and responsive sensitivity profile is made moderate progress.(3) energisation mode of the present invention is a single electrode, and all the other are detecting electrode, and therefore detected electrode scope becomes big, does not have the contiguous not detected phenomenon of electrode of exciting electrode.(4) the single drive electrode method system adopts bipolar square wave current excitation Design of Signal, and detected signal also is the bipolar square wave signal.The bipolar square wave signal has solved the problem of electrode polarization, in every half period of square wave, is equivalent to a direct current signal simultaneously, is easy to like this handle.Therefore the hardware configuration of system is simplified, and direct current signal does not need to separate mediation low-pass filtering link simultaneously, has improved the real-time of system greatly.
Description of drawings
Accompanying drawing 1 is system construction drawing of the present invention.
Accompanying drawing 2 is the electrode module structural drawing.
Accompanying drawing 3 electrode gating logic modular structure figure.
Accompanying drawing 4 data acquisition module block structural diagrams.
Accompanying drawing 5 Logic control module structural drawing.
Accompanying drawing 6 is single drive electrode method pattern barnyard data.
Accompanying drawing 7 is positioned at the comparing data of diverse location for bubble.
Accompanying drawing 8 is positioned at the middle measurement data in thing field for bubble.
Wherein: the 1-sensor assembly; 2-electrode gating logic module; The 3-signal generating module; The 4-signal pre-processing module; The 5-data acquisition module; The 6-Logic control module; The 7-computing machine; The 8-outer meeting resistance; The 9-latch; The 10-code translator; The 11-A/D converter; The 12-data-carrier store; The 13-Timer.
Embodiment
Below the present invention is further illustrated by specific embodiment.
Each assembly has been connected and composed the Electrical Resistance Tomography system of single drive electrode method by accompanying drawing 1 by data line, address wire, control line etc.Only used 2 layers of electrode module in the present embodiment, every layer of 16 electrode, outer meeting resistance 8 is set at 80 Ω, and exciting current is set at 10mA.Square wave signal generator is made up of the signal generation chip of a slice MAX series; Voltage controlled current source is made up of two instrument amplifiers in the signal generating module 3; Zero passage detection is made up of a slice operational amplifier; The electrode gating logic module is advanced 8 by five 8 and is gone out latch, a slice 8 and select 1, four 16 and select 1 and two 16 and select 15 code translators to form; Signal pre-processing module is made up of two PGA amplifiers; Data acquisition module is made up of a slice A/D converter, a slice data-carrier store, a slice Timer.Logic control module advances 8 by 28 and goes out latch and a slice 16 selects 1 code translator to form.
At first computing machine 7 is selected the amplitude and the frequency of bipolar square wave signal generator by address wire, produce the bipolar square wave voltage signal, voltage signal is leaded up to voltage controlled current source and is changed the bipolar square wave current signal into, and another road is given computing machine through operational amplifier by data line and done synchronizing signal.The electrode gating logic module is sent address signal by computing machine the conducting of excitation, detection, outer meeting resistance is selected.Detected signal is delivered to signal pre-processing module by data line, the enlargement factor of signal pre-processing module is selected by address wire by computing machine, pretreated signal is delivered to data acquisition module by data line, carry out analog to digital conversion by A/D converter, translation data stores in the data-carrier store under the control of Timer, sends analysis and processing that computing machine carries out imaging or data at last to.Logic control module is controlled the logic-enabled of chip by address wire by computing machine.。
Below from barnyard experimental data and have two kinds of situations of bubble experimental data to verify.
Experimental example 1, utilize the present invention to the barnyard analysis of experimental data
The dielectric conductance rate is 9.865ms/cm in.The barnyard data that Fig. 6 is collected for the single drive electrode method modular system, this group data characteristic is: at first from the figure as can be seen, the interference that data acquisition is subjected to is very little, and the DATA DISTRIBUTION symmetry is good, illustrates that the square wave excitation signal can access good application in the single drive electrode method system; Next is that maximum differences of this group data is no more than 2.5 times, and data all keep off in zero, and this is fine with regard to the data homogeneity that instruction book electrode excitation type collection arrives.Therefore on the barnyard data, can affirm, based on the dependable performance of the Electrical Resistance Tomography system of single drive electrode method pattern.
Experimental example 2, bubble compare near electrode and the experimental data that is positioned at pipeline center
Being positioned at pipeline with the bubble of 15mm is example near the experiment of each electrode, and when bubble during respectively near each electrode, the gained comparing data as shown in Figure 7.Because the symmetry of single drive electrode method system data, only provided the DATA DISTRIBUTION that bubble is positioned at 1～7 electrode place here, the positional information of bubble as can be seen obviously from figure.When bubble is close to electrode, because its distribution influence to responsive is inhomogeneous, so the data that obtain can clearly say something; And when bubble is positioned at pipeline center, be the measurement data that bubble diameter is not positioned at center, thing field gained simultaneously as Fig. 8,1 group of data is the barnyard data, 2～5 groups of data bubbles increase successively.Because bubble is even or evenly approaching to the influence of responsive field distribution, when constant then and there, the bubble difference, the distribution of the data that collect is identical, unique difference is respectively to organize the amplitude difference of data.This point can illustrate that the sensitivity at a responsive center is not so good as the highly sensitive of border under the single drive electrode method pattern, and this also is the common fault of the various incentive modes of Electrical Resistance Tomography.
Above description of test single drive electrode method pattern can be used in the Electrical Resistance Tomography system, the static properties of designed single drive electrode method system has also obtained checking by these experiments, by these experiment simultaneous verifications square wave excitation signal accuracy and the reliability in the single drive electrode method system, used.
Claims (1)
1. the Electrical Resistance Tomography system of single drive electrode method, mainly form by electrod-array sensor assembly (1), electrode gating logic module (2), signal generating module (3), signal pre-processing module (4), data acquisition module (5), Logic control module (6), computer module (7) and outer meeting resistance (8), it is characterized in that electrod-array sensor assembly (1) is made up of 1～16 layer of electrode, place 16 or 32 electrodes for every layer, every layer of electrode module has different logical addresses, by electrode gating logic module (2) every layer of electrode module selected; Described electrode gating logic module (2) is selected excitation, detection and the outer meeting resistance of 16 or 32 electrodes in each layer electrode module simultaneously; Signal generating module (3) produces the bipolar square wave voltage signal, converts the bipolar square wave current signal to through the voltage controlled current source in the signal generating module (3); By signal pre-processing module (4) magnitude of voltage of outer meeting resistance (8) is carried out pre-service and deliver to data acquisition module (5), by inquiry mode data are handled or image reconstruction by computer module (7).
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102323302A (en) * | 2011-08-16 | 2012-01-18 | 浙江大学 | Non-contact electrical resistance tomography data acquisition device and method |
| CN102495107A (en) * | 2011-10-19 | 2012-06-13 | 天津大学 | Internal and external composite array sensor for detecting process parameter of fluid in pipeline |
| CN104634829A (en) * | 2015-02-16 | 2015-05-20 | 天津大学 | Electrical tomography Lp-regularized reconstructing method based on p-vector geometric shrinkage |
| CN105403595A (en) * | 2015-12-22 | 2016-03-16 | 北京交通大学 | Tuber resistance imaging data acquisition system based on FPGA |
| CN105784785A (en) * | 2016-04-26 | 2016-07-20 | 重庆大学 | Two-phase flow measurement system for nuclear reactor rod bundle channel based on electrical resistance tomography |
| CN105827234A (en) * | 2015-12-09 | 2016-08-03 | 西安科技大学 | Current excitation and multi-electrode selection integrated conditioner for electrical resistance tomography (ERT) |
| CN108241007A (en) * | 2018-03-19 | 2018-07-03 | 深圳大学 | Embedded type concrete three-dimensional resistance imaging sensor array and imaging system |
| CN110412083A (en) * | 2019-08-21 | 2019-11-05 | 吉林医药学院 | A kind of dialysis waste liquid conductivity measuring apparatus and detection method |
| JP2020051821A (en) * | 2018-09-26 | 2020-04-02 | 日置電機株式会社 | Processor and processing method |
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2005
- 2005-11-17 CN CN 200510016130 patent/CN1766597A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102323302B (en) * | 2011-08-16 | 2013-01-02 | 浙江大学 | Non-contact electrical resistance tomography data acquisition device and method |
| CN102323302A (en) * | 2011-08-16 | 2012-01-18 | 浙江大学 | Non-contact electrical resistance tomography data acquisition device and method |
| CN102495107A (en) * | 2011-10-19 | 2012-06-13 | 天津大学 | Internal and external composite array sensor for detecting process parameter of fluid in pipeline |
| CN102495107B (en) * | 2011-10-19 | 2013-09-25 | 天津大学 | Internal and external composite array sensor for detecting process parameter of fluid in pipeline |
| CN104634829B (en) * | 2015-02-16 | 2017-03-22 | 天津大学 | Electrical tomography Lp-regularized reconstructing method based on p-vector geometric shrinkage |
| CN104634829A (en) * | 2015-02-16 | 2015-05-20 | 天津大学 | Electrical tomography Lp-regularized reconstructing method based on p-vector geometric shrinkage |
| CN105827234B (en) * | 2015-12-09 | 2018-06-15 | 西安科技大学 | Towards the integrated conditioner of current excitation and multi-electrode selection of electrical resistance tomography |
| CN105827234A (en) * | 2015-12-09 | 2016-08-03 | 西安科技大学 | Current excitation and multi-electrode selection integrated conditioner for electrical resistance tomography (ERT) |
| CN105403595A (en) * | 2015-12-22 | 2016-03-16 | 北京交通大学 | Tuber resistance imaging data acquisition system based on FPGA |
| CN105784785A (en) * | 2016-04-26 | 2016-07-20 | 重庆大学 | Two-phase flow measurement system for nuclear reactor rod bundle channel based on electrical resistance tomography |
| CN108241007A (en) * | 2018-03-19 | 2018-07-03 | 深圳大学 | Embedded type concrete three-dimensional resistance imaging sensor array and imaging system |
| JP2020051821A (en) * | 2018-09-26 | 2020-04-02 | 日置電機株式会社 | Processor and processing method |
| JP7179552B2 (en) | 2018-09-26 | 2022-11-29 | 日置電機株式会社 | Processing equipment and processing method |
| CN110412083A (en) * | 2019-08-21 | 2019-11-05 | 吉林医药学院 | A kind of dialysis waste liquid conductivity measuring apparatus and detection method |
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