CN103439375B - A kind of integrated capacitive-ultrasound tomography sensor - Google Patents
A kind of integrated capacitive-ultrasound tomography sensor Download PDFInfo
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- CN103439375B CN103439375B CN201310373305.2A CN201310373305A CN103439375B CN 103439375 B CN103439375 B CN 103439375B CN 201310373305 A CN201310373305 A CN 201310373305A CN 103439375 B CN103439375 B CN 103439375B
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Abstract
The invention discloses a kind of integrated capacitive-ultrasound tomography sensor in sensor design field.Sensor comprises capacitance tomography sensor and ultrasound tomography sensor; Capacitance tomography sensor comprises one or more potential electrode module; Ultrasound tomography sensor is made up of ultrasound transducer array.This sensor ring around detected space, the distribution of dielectric coefficient in its capacitance tomography sensor measure portion measurement space; Meanwhile, ultrasound tomography sensor measurement part measures the ultrasonic propagation velocity distribution of measured section.This sensor can provide measured capacitance signal and ultrasonic signal simultaneously, and the two, by a kind of unified image reconstruction algorithm, reconstructs the flame distribution image in measured space.
Description
Technical field
The invention belongs to sensor design field, particularly relate to a kind of integrated capacitive-ultrasound tomography sensor.
Background technology
The distribution of combustion process Flame is usually closely related with the state of burning.Such as flame degree of filling, kindling point, the length of flame and subtended angle etc. are the important parameters of burning.In addition, the flicker frequency of burning Flame, also often relevant with the stability of burning.Therefore, for the space distribution of flame, and the detection of flicker frequency, be the important ways and means such as fired state diagnosis and burner research and development.
Electrical capacitance tomography is the parameter detecting technology of new generation of getting up along with the progress of computer technology and detection technique, and its English name is Electric CapacitanceTomography, is called for short ECT.Be similar to known medicine CT, ECT with senser element with electrod-array from the measured section of external rings around flow channel, by the capacitance between all electrode pairs of mode sequentially determining of scanning.In measured section, the change of species distribution will cause the respective change of surveyed capacitance, and ECT, then according to surveyed capacitance, reconstructs the species distribution in measured section by the process of image reconstruction.Compared with medicine CT, the leading decades of times of speed of capacitance chromatography imaging even more than hundred times, can realize the real-time measurement of transient, and safety, economy, flexibly; Compared with optical measurement, capacitance chromatography imaging is not then by the impact of equipment light transmission.
The measuring object of ECT can be diversified, comprises gas-solid phase, gas-liquid two-phase flow, solid-liquid two-phase flow, has the liquid-liquid two-phase flow of different dielectric coefficient, and the polyphasic flow such as solid-liquid-gas three-phase flow.Common application is that the ducted Entropy density deviation of different liquids is measured, the oil such as, in petroleum production engineering in pipeline-water two-phase flow, or the cross-sectional distribution of oil and even flow measurement in oil gas water three phase flow.Because ECT potential electrode can be installed around the periphery of measurement space, so ECT sensor itself can not impact the flowing in pipeline, be a kind of measuring technique of non-intervention type; Meanwhile, ECT can also obtain the complete species distribution figure on measured cross section.
Ultrasonic tr-ansducer or ultrasonic transducer, its English name is Ultrasonic Transducer, use excess revolutions parallel operation as sensor, and the marked difference of ultrasonic propagation velocity in different medium and the relation between acoustic wave propagation velocity and temperature in integrated use Principles of Acoustics, pair cross-section species distribution and thermo parameters method can carry out image reconstruction, this ultrasonic imaging technique is another kind of emerging non-intervention type imaging technique.Adopt ultrasonic method can a cross section polyphasic flow distribution of measuring channel inside, also can measure air-flow or liquid the stream even temperature field of polyphasic flow simultaneously, solve the interference of thermopair stream field, equally pipeline flow field is not impacted, improve the problem of temperature measure poor real simultaneously, and solve an one-sidedness problem surveyed, the Temperature Distribution in this cross section can be obtained comprehensively, but ultrasonic method for polyphasic flow measurement imaging effect and not as capacitance chromatography imaging so accurate, but, combine the ECT-UST sensor of ultrasonic method and capacitance chromatography imaging, in conjunction with the advantage of two kinds of methods, and utilize unified image reconstruction algorithm, can complete closed channel or the flame combustion situation of combustion space and the comprehensive detection of cross section species distribution and Temperature Distribution.
Capacitance chromatography imaging and ultrasound tomography, two kinds of measuring methods emphasized particularly on different fields, but, these two kinds of methods have again much similar place, and the two is all non-invasive measurement mode, and the internal motion for measurement space impacts all hardly, simultaneously, these two kinds of detection modes can use unified image reconstruction algorithm again, therefore, are a kind of ideal detection schemes by both comprehensive R. concomitans.
Summary of the invention
For mention in background technology in metal piping system, cannot realize while the structure not affecting equipment and mechanical property, the mode flowed not disturb fluid carries out the problem of the measurement of Entropy density deviation on pipeline section, the present invention proposes a kind of integrated capacitive-ultrasound tomography sensor.
A kind of integrated capacitive-ultrasound tomography sensor, it is characterized in that, described sensor comprises capacitance tomography sensor and ultrasound tomography sensor; The plane at described capacitance tomography sensor place and the plane at ultrasound tomography sensor place are parallel to each other; Ultrasound tomography sensor parallel is in capacitance tomography sensor, separated by a distance with capacitance tomography sensor, arrange around burning gallery, capacitance tomography sensor array is close to the outer wall of burning gallery, does not affect all states in passage completely;
Described capacitance tomography sensor comprises one or more potential electrode module; Described potential electrode module adopts the structure of three layers of printed circuit board, comprises inner panel, electrode array strake and outside plate; Described inner panel forms the inwall of Measurement channel; The centre of described electrode array strake is the substrate of non-conductive material; Described substrate is front towards the one side of Measurement channel, the guarded electrode between layout potential electrode, potential electrode lead-in wire, potential electrode and the end profile shielding electrode at potential electrode two ends; The another side of described substrate is the back side, arranging shielding electrode; Described outside plate forms outside capacitance tomography sensor;
Wherein, the end profile shielding electrode at the guarded electrode between described potential electrode, potential electrode two ends is connected by the wire through substrate with the guarded electrode of substrate back;
Described ultrasound tomography sensor is made up of ultrasound transducer array; Described ultrasound transducer array comprises N number of ultrasonic transducer, and one of them ultrasonic transducer is as emitter, and remaining ultrasonic transducer is as receiving trap.
During described multiple potential electrode block combiner, the shape formed comprises close-shaped and non-closed proterties; Described closed proterties comprises circle, ellipse and rectangle; Described non-closed shape comprises flute profile and semicircle.
During described multiple potential electrode block combiner, guarded electrode between installation module between adjacent two potential electrode modules, and intermodule guarded electrode is connected by common wire.
Described N number of ultrasonic transducer is evenly arranged in an annular manner in same plane.
The invention has the beneficial effects as follows:
(1) thickness of capacitance tomography sensor is minimum, can when not changing original burning gallery, and even drop to minimum negligible degree on the impact of flowing, thus formation one can not change original flow channel, and the tomography sensor of the not interior flowing of interfering channel, the problem that conventional sensor needs to replace the original pipeline of part or space wall surface material can be solved thus.
(2) due to the inner panel that capacitance tomography sensor potential electrode is very thin on the surface, the impact of the dielectric coefficient of inner panel significantly reduces, and contributes to the measurement sensistivity improving sensor, reduces error, thus obtain excellent measurement performance.
(3) ultrasound tomography sensor can be close on the outer wall of detected space, utilize ultrasound wave to the extremely strong penetration power of solid, ultrasound wave very easily can enter detected space through wall, hyperacoustic this characteristic, one can be formed equally and do not change original burning gallery, and the tomography sensor of the not interior flowing of interfering channel, the wall in original pipeline or space need not be replaced equally.And ultrasound examination precision is high, contribute to obtaining good measurement result.
(4) capacitance tomography sensor integral thickness is minimum and have good pliability, ultrasound tomography sensor array is only with being arranged in outside wall, such integrated capacitive-ultrasound tomography sensor can have various sizes and can carry out the adjustment of shape to a certain extent, thus the adaptability very flexibly had multiple burning gallery structure, make sensor can be arranged in any position of burning gallery neatly, except the wall of rectangular duct can be adapted to, circular channel wall also can be adapted to preferably.
(5) capacitance tomography sensor is formed by discrete block combiner, and modules can design according to the size of existing burning gallery (be such as designed to different width and finally form the square-section of different size) respectively, finally all modules is combined in passage.Ultrasound tomography sensor array, only need be parallel to the outside wall surface that capacitance tomography sensor is arranged in burning gallery as required.
Accompanying drawing explanation
Fig. 1 is the structural drawing of the electrode array strake of capacitance tomography sensor provided by the invention; Wherein, (a) is the one side towards measured passage of electrode array strake; B () electrod-array backboard is to the one side of measured passage;
Fig. 2 is the arrangement enlarged drawing of a sensor in ultrasound tomography sensor array provided by the invention;
Fig. 3 is the detailed structure view by the integrated capacitive-ultrasound tomography sensor of five block combiner provided by the invention; Wherein, (a) top view that is sensor; B () is left side view;
Fig. 4 is the layout of integrated capacitive-ultrasound tomography sensor in flow channel and data acquisition instrument connected mode;
Wherein, 1-electrode array strake; 2-potential electrode goes between; 3-potential electrode; Guarded electrode between 4-potential electrode; The end profile shielding electrode at 5-potential electrode two ends; 6-substrate back guarded electrode; 7-detected space wall; 8-ultrasonic transducer; 9-ultrasonic transducer goes between; 10-ground wire; The capacitance tomography sensor of the tested channel interior of 11-; 12-intermodule guarded electrode; The capacitance tomography sensor of the tested passage outside of 13-; 14-combustion measurement space; 15-data acquisition instrument.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.It should be emphasized that following explanation is only exemplary, instead of in order to limit the scope of the invention and apply.
Fig. 1 is the structural drawing of the electrode array strake of capacitance tomography sensor provided by the invention; Wherein, (a) is the one side towards measured passage of electrode array strake; B () electrod-array backboard is to the one side of measured passage.Wherein, the centre of electrode array strake 1 is the substrate of non-conductive material; Described substrate is front towards the one side of Measurement channel, the guarded electrode 4 between layout potential electrode 3, potential electrode lead-in wire 2, potential electrode and the end profile shielding electrode 5 at potential electrode two ends; The another side of described substrate is substrate back guarded electrode 6.Guarded electrode 4 between potential electrode, the end profile shielding electrode 5 at potential electrode two ends are connected by the wire through substrate with the guarded electrode 6 of substrate back; Described outside plate is formed outside capacitance tomography sensor.
Fig. 2 is the arrangement enlarged drawing of a sensor in ultrasound tomography sensor array provided by the invention.Wherein, ultrasonic transducer 8 is installed on detected space wall 7, and to be gone between 9 connection signal generators by ultrasonic transducer; Also carry out ground connection by ground wire 10 simultaneously.Each sensor in UST sensor array is this kind of connected mode.
Fig. 3 is the detailed structure view by the integrated capacitive-ultrasound tomography sensor of five block combiner provided by the invention; Wherein, (a) top view that is sensor; Display side, test section, comprises the capacitance tomography sensor 13 of the capacitance tomography sensor 11 of tested channel interior, intermodule guarded electrode 12 and tested passage outside respectively; In Measurement channel outside, ultrasonic transducer 8 is also installed; B () is left side view, the left side module of display sensor, and upper and lower module.By left view, can see and arrange the capacitance tomography sensor 11, potential electrode lead-in wire 2, the capacitance tomography sensor 13 of tested passage outside that comprise for tested channel interior being positioned at the sensor on the bottom xsect of combustion measurement space 14.The capacitance tomography sensor 11 of tested channel interior is arranged in plate impact faces, whole pedestal is paved with the form of array, center through hole is passage of flame, and potential electrode is inner in the face of combustion zone, and is gone between by the capacitance tomography sensor 11 of inside, potential electrode and 2 to connect; The capacitance tomography sensor 13 of tested passage outside, around passage of flame outer wall one week, in pipe and to manage the layout of outer capacitance tomography sensor substantially identical; Electrode array strake is towards the plate face of passage of flame, be called for short medial surface, medial surface arranges potential electrode, and the guarded electrode between potential electrode, end profile shielding electrode, and potential electrode lead-in wire 2, be arranged on lateral surface, the lead-in wire of slightly distinguishing inner capacitance tomography sensor 11 penetrates tube wall to connect out.Ultrasound tomography sensor, with the arranged in form of array passage of flame outer wall one week, and with capacitance tomography sensor cross-section parallel, the two spacing is without explicitly calling for, and the course of work of the two becomes mutual interference not.
Fig. 4 is the layout of integrated capacitive-ultrasound tomography sensor in flow channel and data acquisition instrument connected mode.
The concrete measuring process of this sensor of the inside and outside installation of burning gallery is as follows:
(1) capacitance tomography sensor is divided into two parts, and the capacitance tomography sensor 11 of tested channel interior is arranged on substrate, and sensor is close to substrate inwall and installs, the capacitance tomography sensor 13 of tested passage outside is looped around channels peripheral.If needed, can also by sensor installation again after substrate inwall a little reaming.After sensor is installed, inner entirety can be very level and smooth like this, guarantees the original state not affecting burning gallery inside.
(2) ultrasound tomography sensor parallel is in capacitance tomography sensor, separated by a distance with capacitance tomography sensor, arrange around burning gallery, capacitance tomography sensor array is close to the outer wall of burning gallery, does not affect all states in passage completely.
(3) demarcation of integrated capacitive-ultrasound tomography sensor measurement is first carried out before measuring.Calibration process is consistent with traditional scaling method, in sensor, namely first do not have each capacitance measuring all electrode pairs during flame combustion, and the acoustic velocity value of every a pair transmitting terminal of ultrasound transducer array and receiving end is demarcated as barnyard simultaneously; Then in isoperibol, capacitance under each different temperatures and acoustic wave propagation velocity during (as in constant temperature oven) raised temperature, is measured as demarcating in the whole field.Then all measurement electric capacity and the velocity of sound is recorded and when measuring for image reconstruction.
(5) start equipment normal operation and with data acquisition instrument 15 collection signal;
(6) temperature distribution image in burning gallery is rebuild according to measuring-signal.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that 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 (4)
1. integrated capacitive-ultrasound tomography sensor, is characterized in that, described sensor comprises capacitance tomography sensor and ultrasound tomography sensor; The plane at described capacitance tomography sensor place and the plane at ultrasound tomography sensor place are parallel to each other; Ultrasound tomography sensor parallel is in capacitance tomography sensor, separated by a distance with capacitance tomography sensor, arrange around burning gallery, capacitance tomography sensor array is close to the outer wall of burning gallery, does not affect all states in passage completely;
Described capacitance tomography sensor comprises one or more potential electrode module; Described potential electrode module adopts the structure of three layers of printed circuit board, comprises inner panel, electrode array strake and outside plate; Described inner panel forms the inwall of Measurement channel; The centre of described electrode array strake is the substrate of non-conductive material; Described substrate is front towards the one side of Measurement channel, the guarded electrode between layout potential electrode, potential electrode lead-in wire, potential electrode and the end profile shielding electrode at potential electrode two ends; The another side of described substrate is the back side, arranging shielding electrode; Described outside plate forms outside capacitance tomography sensor;
Wherein, the end profile shielding electrode at the guarded electrode between described potential electrode, potential electrode two ends is connected by the wire through substrate with the guarded electrode of substrate back;
Described ultrasound tomography sensor is made up of ultrasound transducer array; Described ultrasound transducer array comprises N number of ultrasonic transducer, and one of them ultrasonic transducer is as emitter, and remaining ultrasonic transducer is as receiving trap.
2. sensor according to claim 1, is characterized in that, during described multiple potential electrode block combiner, the shape formed comprises close-shaped and non-closed shape; Describedly close-shapedly comprise circle, ellipse and rectangle; Described non-closed shape comprises flute profile and semicircle.
3. sensor according to claim 1, is characterized in that, during described multiple potential electrode block combiner, and guarded electrode between installation module between adjacent two potential electrode modules, and intermodule guarded electrode is connected by common wire.
4. sensor according to claim 1, is characterized in that, described N number of ultrasonic transducer is evenly arranged in an annular manner in same plane.
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| AU2003256141A1 (en) * | 2003-08-22 | 2005-03-10 | Instituto Mexicano Del Petroleo | Method of viewing multiphase flows using electrical capacitance tomography |
| CN100491993C (en) * | 2007-03-05 | 2009-05-27 | 天津大学 | ECT/ERT double mode-state imaging system cross-type composite array sensor |
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| CN102156225B (en) * | 2011-03-18 | 2013-05-01 | 华北电力大学 | Capacitance tomography sensor with powder dielectric coefficient variation measurement electrode |
| CN102305828A (en) * | 2011-05-13 | 2012-01-04 | 中北大学 | Encircling-array-based ultrasound computed tomography detection system and method |
| CN202330346U (en) * | 2011-11-16 | 2012-07-11 | 公安部第三研究所 | Improved capacitance sensor for security detection on liquid prohibited products |
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| CN107091858A (en) * | 2017-03-27 | 2017-08-25 | 北京航空航天大学 | A kind of method mapped by Current Voltage map construction voltage x current |
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