CN100362341C - Compound array sensor of ERT/ECT bimodel state imaging system - Google Patents
Compound array sensor of ERT/ECT bimodel state imaging system Download PDFInfo
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Abstract
The present invention discloses a composite array sensor of an ERT / ECT double mode state imaging system, which can realize the imaging measurement for any measured multi-phase fluids in any conductive capacity ranges. The present invention comprises an ERT electrode array and an ECT electrode array, wherein the number of electrodes in the ERT and ECT electrode arrays is the same. Moreover, the electrodes in the ERT electrode array and the ECT electrode array are respectively and oppositely arranged on the inner and outer walls at the same section of a measured fluid pipeline by sealing insulation washers and fixing nuts in a circumference uniform distribution way. The number of electrodes in two electrode arrays is 8 to 64, and simultaneously, a radial shielding electrode is arranged between each two ECT electrodes. Then, the outer part of the radial shielding electrode is provided with a shielding cover. The present invention has the advantages that the present invention can simultaneously obtain the flowing field distribution information of the measured fluid in the same time and position. Consequently, the mutual state of the existing ERT and ECT technologies is realized, which can establish the better base for further researching the imaging technology of the electrics procedure.
Description
Technical field
The present invention relates to a kind of electricity imaging technique, relate in particular to a kind of sensor that is applied to the electricity imaging technique.
Background technology
In commercial production such as oil, chemical industry, electric power, metallurgy, building materials, food, exist the situation of a large amount of heterogeneous material mixed flow.As the oil/gas in the petroleum industry, oil/water two-phase flow, oil/gas/water multiphase etc.; Gas/fixed double phase flow in and for example metallurgical, the power industry in the various pneumatic material conveyance conduits etc.; Also have in the fields such as chemical industry, medicine, the energy, the dry run of material, mixed process, fluidization process, diffusion process, course of reaction etc. all relate to the problem of polyphasic flow.So, study flow characteristics and Changing Pattern that two (many) flow mutually, and its correlation parameter is detected, have crucial meaning for safe, running efficiently in related scientific research, design and the production run.
Process imaging (PT, process tomography) technology, it is a kind of two-phase flow/polyphasic flow detection technique that development in recent years is got up, it adopts the sensor space array of particular design, obtain the flow field information of measurand with noncontact or non-intruding mode, present kind mainly contains optical imagery, radial imaging, Magnetic resonance imaging, ultrasonic imaging, electricity imaging etc.With low cost, advantages such as device is simple, no nuclear radiation that electricity formation method wherein has have obtained domestic and international many research organizations pay much.And resistance imaging (ERT, Electrical Resistance Tomography) and capacitance imaging (ECT, Electrical Capacitance Tomography) then be two kinds of imaging modes that are able to broad research in the electricity imaging, such as industrial process imaging and biological impedance etc.
In the industrial process imaging applications, sensor space array electrode is fixed on the fluid line, and in biological impedance, sensor space array electrode is installed in flexible soft being with, and then sensor is fixed on tested position.Be imaged as example with industrial process, in ERT and ECT system, array electrode is installed on the fluid line wall, according to the certain range of excitation pattern, by array electrode being applied alternating voltage (or electric current) pumping signal, measure the response signal of array electrode, can extract the electrical characteristics (resistivity of measurand, the space distribution of specific inductive capacity) information, again after data acquisition unit is handled, the utilization image reconstruction algorithm reproduces the distribution situation of two-phase/heterogeneous fluid on pipe interior or the inner a certain xsect of reaction unit, obtain in the two-phase flow that discrete phase concentration distributes and rule over time, thereby realize tested two-phase fluid visual on a certain cross section.
Because ERT measured resistivity information, the flow field can equivalence be a Resistance model for prediction, so usually electrode is installed in the inwall of pipeline so that exciting current injects the flow field; And the ECT Measuring Dielectric Constant, the flow field can equivalence be a capacitor model, so usually electrode is installed in the outer wall of pipeline.ERT system requirements detected fluid has conductive capability preferably, and the conductivity of ECT system requirements detected fluid can not be too high, otherwise capacitor model is untenable.Therefore,, when then the content of water is big,, can adopt the ERT technology, and the content of water is hour because of its conductivity is bigger if analyze oil-water two-phase flow in the petroleum industry, less because of its conductivity, can adopt the ECT technology.
At present at home and abroad, ERT and ECT technology are to distinguish independent operating, and its sensor also is separately independently.Use such metering system research oil-water two-phase flow, if the relative content of water and oil can't be predicted, that petty ERT and ECT method will be subjected to very big restriction.Need be used in combination two technology this moment, to complement each other the two insensitive measurement zone.Traditional method is that the electrode with ERT and ECT two cover sensors is installed on fluid line two cross sections axially separated by a distance, and such setting can make its responsive to be independent of each other, and measuring method is also very simple.But because two cover sensors are installed in diverse location, the problem of embodiment is the Flow Field Distribution information that measurement result can not reflect same time, same position, thereby is difficult to embody the complementary characteristics of ERT and ECT technology.
Summary of the invention
Purpose of the present invention is exactly at the deficiencies in the prior art, a kind of ERT/ECT bimodal imaging system composite array sensor that ERT and ECT technology are really combined together is provided, with measurement range and the applicable surface of widening the electricity imaging technique, give full play to the data fusion advantage of multisensor, make it realize imaging measurement in any conductive capability scope any tested heterogeneous fluid.
ERT/ECT bimodal imaging system composite array sensor of the present invention, the ERT electrod-array and the ECT electrod-array that comprise the number of electrodes unanimity, electrode in described ERT electrod-array and the ECT electrod-array is respectively by on sealed insulation packing ring and the inside and outside wall of hold-down nut with the relative same section that is arranged on the detected fluid pipeline in circumference uniform distribution mode position, number of electrodes in described two kinds of electrod-arrays is respectively 8～64, be provided with radially guarded electrode between per two ECT electrodes, the outer setting of described radially guarded electrode has radome.
Number of electrodes in described ERT electrod-array and the ECT electrod-array can be selected 8,12,16 or 32 for use, is preferably 16.
ERT electrode in the described combination electrode array is a bolt shape, and it is made with stainless steel, titanium alloy or silver chloride; ECT electrode in the described combination electrode array is middle porose rectangular-shaped, and it is made with metallic copper.
The invention has the beneficial effects as follows: because when using described ERT/ECT bimodal imaging system composite array sensor, its two covers electrode is installed on simultaneously the same sectional position of fluid line, so can obtain simultaneously detected fluid at one time, the Flow Field Distribution information of same position, thereby the complementation of existing ERT technology and ECT technology is really become a reality.
Description of drawings
Fig. 1 is the cross section structure synoptic diagram of sensor of the present invention;
Fig. 2 is the partial enlarged drawing of A portion among Fig. 1;
Fig. 3 is that the A of Fig. 2 is to view (saving nuts and washers);
Fig. 4 is the structural representation of ECT electrode among the present invention;
Fig. 5 is the structural representation of ERT electrode among the present invention.
Embodiment
Below in conjunction with each accompanying drawing and embodiment the technology of the present invention is further described:
ERT/ECT bimodal imaging system composite array sensor of the present invention, the ERT electrod-array and the ECT electrod-array that comprise the number of electrodes unanimity, as shown in Figure 1 and Figure 2, ECT electrode 3 in ERT electrode 2 in the described ERT electrod-array and the ECT electrod-array is respectively by on sealed insulation packing ring 4 and the inside and outside wall of hold-down nut 5 with the relative same section that is arranged on detected fluid pipeline 1 in circumference uniform distribution mode position, be provided with radially guarded electrode 7 between per two ECT electrodes 3, the outer setting of described radially guarded electrode 7 has radome 6.
The number of the various electrodes in the ERT/ECT bimodal imaging system composite array sensor of the present invention equates, according to measuring needs, can be set to various series such as 8,12,16,32,64.In the present embodiment, the number of various electrodes is set to 16.The ERT electrode 2 that is installed in detected fluid pipeline 1 inboard is set to bolt shape as shown in Figure 5, contacts with detected fluid; The ECT electrode 3 that is installed in detected fluid pipeline 1 outside is porose rectangular-shaped in center shown in Figure 4, insulate with detected fluid.In theory, for the reliable needs of installing, described ECT electrode 3 should slightly certain radian so that closely be attached on the outer wall of tested pipeline 1, but consider the impossible consistent situation of pipe diameter of the detected fluid of each measurement, and uniform a plurality of electrodes can be ignored very little electrode subtended angle (such as 16 electrodes are set in the present embodiment on the circumference of fluid line, the subtended angle of electrode is less than 360 °/16=22.5 °), so described ECT electrode 3 can be made plane, in order to satisfy the reliable needs of installing, can revise pipeline outer wall slightly, make it be small flat surface shape.
Described ERT electrode 2 is made with the conductor material of stable electrochemical property, generally selects stainless steel, titanium alloy or silver chloride etc. for use; Described ECT electrode 3 with the good conductor material of electricity, is generally selected metallic copper for use; Described radially guarded electrode 7 is provided with one between per two ECT electrodes 3, it is shaped as the rectangle sheet that adopts sheet copper to make, its length is greater than the length (as shown in Figure 3) of ECT electrode 3, and so the purpose that is provided with is to shield the effect of disturbing between each electrode in order to bring into play it; Described radome 6 adopts Copper Foil to make, and is arranged on the outermost layer of whole sensor, with shield sensor integral body.Drawing lead and can directly being welded on the electrode of each electrode also can be fixed on the screw with ply-yarn drill.
The measurement of polyphasic flow is a best applications occasion of the present invention.Consider current density and the homogeneity of Electric Field Distribution and the factors such as signal to noise ratio (S/N ratio) of measuring-signal in the tested flow field, this sensor is the best applications pattern so that 16 electrodes to be set, and other technical data can change in proportion according to the physical size of pipeline in the application system.For example: the internal diameter 102mm of detected fluid pipeline 1, external diameter 110mm, the best of then used sensor technology data is set to: the diameter 6mm of ERT electrode 2; The length and width size 80mm X 18mm of ECT electrode 3,18.5 ° of electrode circumference subtended angles; The length and width size 120mm * 20mm of guarded electrode 7 radially.
Because ERT electrod-array and ECT electrod-array are used to measure the different parameters in flow field, so two cover electrod-arrays can not be worked simultaneously.Promptly when described ERT electrode 2 is applied pumping signal, just can not apply pumping signal to described ECT electrode 3 simultaneously, vice versa.Therefore, when sensor of the present invention with after data acquisition circuit is connected, ERT electrode 2 wherein and ECT electrode 3 will be by the commutation circuit time-sharing works.Again since data acquisition system (DAS) can switch with very high speed between, so, can think that the measured result of two cover electrod-arrays can reflect the conductivity in same time, same position flow field and the distributed intelligence of specific inductive capacity.
The present invention may be used on also can be used for the electricity imaging measurement of bio-impedance in the electricity imaging measurement of polyphasic flow.Bio-impedance is the physical quantity that can reflect biological tissue, organ, cell or whole living organism electrical properties, and the bio-impedance technology then is to utilize the electrical characteristics (impedance, admittance, specific inductive capacity etc.) of biological tissue and organ and change extraction and a kind of not damaged detection technique of Human Physiology, biomedical information that pathological condition is relevant.It normally applies ac-excited curtage by the electrode system that places body surface to measured body, detects corresponding electrical impedance and variation thereof, according to different application purposes, obtains relevant physiology and pathological information.ERT/ECT bimodal imaging system composite array sensor of the present invention is applied in biological tissue's functional diagram as monitor system, is the another useful effect in its wide application prospect that has.
When being used for biological impedance, since the singularity (such as the fault imaging of human chest) of bio-measurement, the installation of inconvenient sensor.For the convenient of sensor of the present invention uses, can all be processed into described ERT electrode 2 and ECT electrode 3 laminar, and described ERT electrode 2 is contacted with tested tissue, and described ECT electrode 3 adopts thin dielectric film and tested tissue to isolate, thereby omits the radially guarded electrode 7 in the above implementation column.
Existing ERT technology can only be measured the fluid that certain conductive capability is arranged, and fluid such as oil-gas two-phase flow that conductive capability is more weak are then usually measured inefficacy, otherwise existing ECT technology can lose efficacy again then to conductive capability fluid measurement preferably.ERT/ECT bimodal imaging system composite array sensor of the present invention then can overcome this defective.
ERT/ECT bimodal imaging system composite array sensor of the present invention, compared with prior art, its advantage is: the same sectional position that the electrode in two kinds of electrod-arrays is installed on simultaneously the detected fluid pipeline, can obtain detected fluid simultaneously at one time, the Flow Field Distribution information of same position, thereby give full play to the data fusion advantage of multisensor, to obtain the electricity image information of any tested heterogeneous fluid in any conductive capability scope, the real complementation that realizes ERT and ECT technology, widen the measurement range and the applicable surface of electricity imaging technique, laid good basis for further studying electricity process imaging technique.
Below schematically the present invention and embodiment thereof are described, this description does not have restricted, and shown in the accompanying drawing also is one of embodiments of the present invention.So,, under the situation that does not break away from the invention aim,, all should belong to protection scope of the present invention without creationary version similar or the embodiment of designing to this technical scheme if those of ordinary skill in the art is enlightened by it.
Claims (5)
1. ERT/ECT bimodal imaging system composite array sensor, it is characterized in that: it comprises the ERT electrod-array and the ECT electrod-array of number of electrodes unanimity, electrode in described ERT electrod-array and the ECT electrod-array respectively by sealed insulation packing ring and hold-down nut with in the relative same section that is arranged on the detected fluid pipeline in circumference uniform distribution mode position, on the outer wall, number of electrodes in described two kinds of electrod-arrays is respectively 8～64, be provided with radially guarded electrode between per two ECT electrodes, the outer setting of described radially guarded electrode has radome.
2. ERT/ECT bimodal imaging system composite array sensor according to claim 1 is characterized in that: the number of electrodes in described ERT electrod-array and the ECT electrod-array is respectively 8,12,16 or 32.
3. ERT/ECT bimodal imaging system composite array sensor according to claim 1, it is characterized in that: the number of electrodes in described ERT electrod-array and the ECT electrod-array is respectively 16.
4. ERT/ECT bimodal imaging system composite array sensor according to claim 1, it is characterized in that: the ERT electrode in the described combination electrode array is a bolt shape, and it is made with stainless steel, titanium alloy or silver chloride.
5. ERT/ECT bimodal imaging system composite array sensor according to claim 1 is characterized in that: the ERT electrode in the described combination electrode array is for middle porose rectangular-shaped, and it is made with metallic copper.
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| CNB2005101225874A CN100362341C (en) | 2005-12-22 | 2005-12-22 | Compound array sensor of ERT/ECT bimodel state imaging system |
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Families Citing this family (17)
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| CN100549684C (en) * | 2007-04-18 | 2009-10-14 | 天津大学 | Image rebuilding method based on Square double mode self-calibration sensor |
| CN101975801B (en) * | 2010-09-30 | 2012-12-26 | 北京交通大学 | Novel multi-mode adaptive sensor system |
| BR112014013030A2 (en) * | 2011-11-30 | 2017-06-13 | Gen Electric | configured system, multiphase measurement system and monitoring method |
| CN104101687B (en) * | 2014-07-10 | 2015-10-28 | 天津大学 | Based on the polyphasic flow visual testing method of ultrasonic Doppler and electricity multisensor |
| CN105973775B (en) * | 2016-04-29 | 2018-11-09 | 江苏大学 | Powder concentration detection device in a kind of spiral conveying tube of two-layer electrode array |
| CN106153130A (en) * | 2016-08-01 | 2016-11-23 | 清华大学深圳研究生院 | A kind of pressure dual-purpose electricity imaging sensing system and data acquisition imaging method thereof |
| CN107544040A (en) * | 2017-07-18 | 2018-01-05 | 天津大学 | A kind of magnetic conductivity electromagnetic chromatographic method based on magnetoresistive transducer |
| CN107764330B (en) * | 2017-10-19 | 2018-11-06 | 西安科技大学 | A kind of adaptive multiphase flow measuring device based on ERT sensors |
| CN108152341B (en) * | 2017-12-05 | 2020-09-25 | 浙江大学 | Low-temperature fluid in-pipe flowing capacitance tomography device |
| CN108577836A (en) * | 2018-05-10 | 2018-09-28 | 吉林大学 | Flexible wearable ERT-ECT bimodals are imaged composite array sensor device |
| CN109580729A (en) * | 2018-11-29 | 2019-04-05 | 哈尔滨理工大学 | A kind of capacitance chromatographic sensor detecting system |
| CN109528306B (en) * | 2019-01-08 | 2020-09-15 | 华北电力大学（保定） | Electromagnetic/resistance bimodal imaging device for guiding hip joint replacement revision surgery |
| CN111272834B (en) * | 2020-03-02 | 2022-10-28 | 太原理工大学 | Nested capacitance tomography sensor and image data acquisition method |
| CN111693574B (en) * | 2020-06-09 | 2022-12-09 | 长江武汉航道工程局 | Three-dimensional liquid-solid two-phase flow detection device and detection method based on electrical tomography |
| CN113960124B (en) * | 2021-09-10 | 2022-10-28 | 西安交通大学 | Portable ECT system with image correction function |
| CN114018954B (en) * | 2021-11-01 | 2024-05-17 | 中国科学院工程热物理研究所 | Multi-mode sensor |
| CN114487023B (en) * | 2021-12-24 | 2024-03-12 | 常州大学 | EIT experimental device and method for monitoring production profile dynamics of multi-branch broken solution oil-gas reservoir combined production reservoir |
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