CN104931399A - Integrative capacitor-laser dust concentration measuring device - Google Patents
Integrative capacitor-laser dust concentration measuring device Download PDFInfo
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- CN104931399A CN104931399A CN201510347812.8A CN201510347812A CN104931399A CN 104931399 A CN104931399 A CN 104931399A CN 201510347812 A CN201510347812 A CN 201510347812A CN 104931399 A CN104931399 A CN 104931399A
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Abstract
The invention discloses an integrative capacitor-laser dust concentration measuring device and belongs to the field of dust concentration measurement devices. The integrative capacitor-laser dust concentration measuring device integrates a capacitance tomography device, a laser holography measuring device and an upper computer via a data acquiring instrument and a multiway switch. The laser holography measuring device and the capacitance tomography device do not interfere with each other due to different measuring theories and both have no effect on all states in channels. The laser holography measuring device is easy to obtain other physical quantities of the flow field, that is, speed information of the whole field. Physical information such as pressure field and vortex field can be conveniently solved by means of fluid motion equation, the capacitance tomography device can measure temperature field and flow field besides concentration field, so that they are complementary to some extent, and the purposes for measuring different parameters and saving resources by the same device can be achieved.
Description
Technical field
The invention belongs to powder concentration measurement apparatus field, particularly relate to the device of a kind of integrated capacitive-laser measurement dust concentration.
Background technology
Dual-Phrase Distribution of Gas olid research relates to the various aspects of industrial processes, has dust emission in various degree, detects its concentration, dust size has very important directive significance to environmental protection in chemical industry, the energy, electric power; At present, acoustics, optics and electrical measurement principle is utilized can to measure dust concentration; By measuring its concentration, and then the optimal control of implementation procedure, enhance productivity, reduce energy consumption, economize energy.
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 Capacitance Tomography, is called for short ECT.ECT is 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.
The polyphasic flow that capacitance chromatography imaging is mainly used in industrial pipeline detects, in the closed conduct that this technology can provide conventional instrument to detect and container, the visual information such as concentration, distribution, motion state of multiphase medium, matches with other measuring technique or instrument and also can be applicable to the real-time detection of polyphasic flow total mass flow rate, phase-splitting mass rate and flow velocity.
Laser holography is mainly used in measuring the flow field of particle, and in addition, laser holography also has good performance in the measurement of micron order and submicron order.Laser Holographic Measurement combine with technique optical measuring technique, computer processing technology, CCD and image processing techniques, by diffraction image process, final measurement obtains particle concentration in Dual-Phrase Distribution of Gas olid; Described device is a kind of measurement mechanism based on electric capacity-laser by two kinds of method integration, realizes the measurement to Dual-Phrase Distribution of Gas olid concentration in detected space.
Capacitance chromatography imaging and Laser Holographic Measurement, the two is all non-invasive measurement mode, internal motion for detected space impacts all hardly, and meanwhile, these two kinds of detection mode measuring principles are different, do not interfere with each other, especially, in some industrial application (as generating plant, transformer station), can there is extremely strong electromagnetic interference (EMI), capacitance chromatography imaging measured value will produce severe deviations, in this case, laser measurement method can compensate for this deficiency.Therefore, by the two integrated use be a kind of ideal detection scheme.
Summary of the invention
The present invention seeks to the device proposing a kind of integrated capacitive-laser measurement dust concentration, it is characterized in that, this device be by data acquisition instrument and multi-way switch, capacitance chromatography imaging device, Laser Holographic Measurement device is partly integrated with host computer three together with; The axis at its capacitance chromatography imaging measurement mechanism place is mutually vertical with the axis at Laser Holographic Measurement device place; In capacitance chromatography imaging measurement mechanism, sensor array is close to the outer wall of tested passage, and the perforate pipeline section of tested passage is placed between lens combination in Laser Holographic Measurement device light path and optical filter; Laser Holographic Measurement device is connected multi-way switch respectively with the input end of capacitance chromatography imaging device (ECT measurement mechanism), output terminal is connection data acquisition system respectively, host computer connects multi-way switch and data acquisition system (DAS) respectively, the device of composition integrated capacitive-laser measurement dust concentration; Wherein, graphical analysis and concentration analysis process are completed by host computer; Laser Holographic Measurement device does not interfere with each other because its measuring principle is different from capacitance chromatography imaging device, and both do not affect all states in passage all completely.
Described capacitance chromatography imaging device is connected to form successively by capacitance sensor array, pumping signal, operational amplifier, ac amplifier circuit, solution mediation filtering circuit, and capacitance sensor array forms by multiple cross section outside tested pipeline is evenly arranged capacitor plate; When the fluid is flowing, arbitrary two-plate partners electric capacity, and in pipeline, the medium of flowing is by producing different specific inductive capacity during capacitor plate, also therefore creates the capacitance of different size, use the concentration field of regularization algorithm to pipeline to complete reconstruction, complete the mensuration to particle concentration.
Described Laser Holographic Measurement device is made up of laser instrument, spatial filter, lens combination, perforate pipeline section, optical filter and CCD camera; All elements are all on same axis.
The measuring process of described Laser Holographic Measurement device sends a narrow beam light by laser instrument, becomes uniform divergent beams, after spatial filter, add lens combination, converge the light that spatial filter sends through spatial filter; Regulate lens combination position axially and the size of light beam, make the light sent become parallel beam injection; Then take there being particle in sharp light-struck pipeline by CCD camera, obtain Bian collection image, afterwards denoising carried out to the image photographed, go background and target identification processing, obtain the two-dimensional position of particle, finally by the axial location of method for reconstructing determination particle, obtain the three-dimensional spatial distribution of particle in measuring channel and particle concentration.
The invention has the beneficial effects as follows and solve in the detection of dust concentration, cannot realize while the structure not affecting equipment and mechanical property, the mode flowed not disturb fluid carries out the measurement problem of the heterogeneous distribution of pipeline section, has following features:
(1) capacitance chromatography imaging measurement device Dual-Phrase Distribution of Gas olid concentration can be subject to electromagnetic interference (EMI), thus the place being unsuitable for existing in generating plant, transformer station etc. strong electromagnetic is measured, Laser Holographic Measurement device is not then vulnerable to the impact of electromagnetic interference (EMI), completes measurement of concetration under can making up the operating mode that can not complete at capacitance chromatography imaging greatly.
(2) in the Dual-Phrase Distribution of Gas olid of Laser Holographic Measurement measurement device during particle concentration, the determination of size on concentration of particle concentration has impact, and particle concentration conference causes shooting not fogging clear, overlapping serious between each particle, is difficult to distinguish; The little meeting of concentration causes measured data very few, is difficult to the characteristic characterizing whole flow field, and in the face of this problem, capacitance chromatography imaging then can meet measurement needs.
(3) capacitance chromatography imaging device is the shortage of quantity of information to the root problem that measuring accuracy restricts, this there will be morbid state essence in the process of image reconstruction, and Laser Holographic Measurement device once can obtain hundreds and thousands of samples, the shortage of quantity of information can not be caused, improve the precision of measurement.
(4) Laser Holographic Measurement device easily tries to achieve other physical quantitys in flow field, the velocity information of the whole audience due to what obtain, fluid motion equation can be used easily to solve the such as physical message such as pressure field, vortex field, and capacitance chromatography imaging device also can record such as temperature field except concentration field, the information such as flow field, realize same device and can measure different parameters, saving resource.
(5) capacitance chromatography imaging device requires very high to capacitance measurement, and this application industrially brings very large difficulty.In addition ECT system need have real-time, this just requires that the flowing velocity of fluid reaches every number of seconds rice or higher, and ECT needs long steady operation, in order to avoid useful signal is flooded by shifted signal, will suppress a large amount of stray capacitances in ECT system while the drift of testing circuit must be made very low, laser then can be supplemented it to a certain extent.
Accompanying drawing explanation
Fig. 1 is the system chart of the device of integrated capacitive-laser measurement dust concentration.
Fig. 2 is the structural drawing of capacitance chromatography imaging device section in whole device.
Fig. 3 is the structural representation of the device of integrated capacitive-laser measurement dust concentration.
Wherein, 1-laser instrument; 2-spatial filter; 3-lens combination; 4-capacitor plate; 5-measuring channel; 6-optical filter; 7-CCD camera; 8-data acquisition instrument; 9-host computer; 10-multi-way switch; 11-pumping signal; 12-operational amplifier; 13-ac amplifier circuit; 14-separates mediation filtering circuit;
Embodiment
The present invention seeks to the device proposing a kind of integrated capacitive-laser measurement dust concentration, below in conjunction with accompanying drawing and enforcement, the present invention is elaborated.
Be illustrated in figure 1 the system chart of the device of integrated capacitive-laser measurement dust concentration, Figure 3 shows that the structural representation of the device of integrated capacitive-laser measurement dust concentration.The concrete structure of the device of integrated capacitive shown in figure-laser measurement dust concentration be by data acquisition instrument and multi-way switch will be capacitance chromatography imaging device (ECT measurement mechanism), Laser Holographic Measurement device is partly integrated with host computer three together with; The axis at its capacitance chromatography imaging measurement mechanism place is mutually vertical with the axis at Laser Holographic Measurement device place; Described capacitance chromatography imaging device is connected to form successively by capacitance sensor array, pumping signal 11, operational amplifier 12, ac amplifier circuit 13, solution mediation filtering circuit 14, and capacitance sensor array forms by the multiple cross sections outside tested pipeline 5 are evenly arranged capacitor plate 4; When Dual-Phrase Distribution of Gas olid is flowed, arbitrary two-plate can partner electric capacity, the medium of flowing in pipeline is by producing different specific inductive capacity during capacitor plate, also the capacitance of different size is therefore created, the change of different electric capacitys is sent in data acquisition instrument, complete the reconstruction to image by certain mathematical algorithm again, finally complete the mensuration to particle concentration.Described Laser Holographic Measurement device is made up of the perforate pipeline section of laser instrument 1, spatial filter 2, lens combination 3, tested pipeline 5, optical filter 6 and CCD camera 7; All elements are all on same axis.
In capacitance chromatography imaging measurement mechanism, sensor array is close to the outer wall (as shown in Figure 2) of tested pipeline 5, and the perforate pipeline section of tested pipeline 5 is placed between lens combination 3 in Laser Holographic Measurement device light path and optical filter 6; Laser Holographic Measurement device is connected multi-way switch 10 respectively with the input end of capacitance chromatography imaging device (ECT measurement mechanism), output terminal is connection data acquisition instrument 8 respectively, host computer 9 connects multi-way switch 10 and data acquisition instrument 8 respectively, the device of composition integrated capacitive-laser measurement dust concentration; Wherein, graphical analysis and concentration analysis is carried out by host computer (computing machine) 9.Laser Holographic Measurement device does not interfere with each other because its measuring principle is different from capacitance chromatography imaging device, and both do not affect all states in tested pipeline 5 all completely.
The measuring process of described Laser Holographic Measurement device sends a narrow beam light by laser instrument 1, becomes uniform divergent beams through spatial filter 2, adds lens combination 3 below, converge the light that spatial filter 2 sends at spatial filter 2; Regulate lens combination 3 position axially and the size of light beam, make the light sent become parallel beam injection; Then take there being particle in sharp light-struck pipeline by CCD camera 7, obtain Bian collection image, afterwards denoising carried out to the image photographed, go background and target identification processing, obtain the two-dimensional position of particle, finally by the axial location of method for reconstructing determination particle, obtain the three-dimensional spatial distribution of particle in measuring channel and particle concentration.
Described capacitance sensor array is used for detecting in Dual-Phrase Distribution of Gas olid flowing, pipeline internal medium by different specific inductive capacity can be produced during capacitor plate, the change of the capacitance caused; Described ECT measures and is used for capacitance information after conversion, amplification and filtering, is sent on host computer by interface; Described graphical analysis and concentration analysis are respectively used to two parts, in electricity, by the capacitance information obtained by analyzing, regularization algorithm is used to rebuild the concentration field in pipeline, wherein also need through carrying out the processes such as denoising to image, and in laser, then picture CCD camera photographed goes after background through denoising, carry out particle identification, then complete the measurement to concentration by concentration analysis.
The concrete measuring process of the device of integrated capacitive-laser measurement dust concentration is as follows:
(1) this measuring process is divided into capacitance chromatography imaging measurement device and Laser Holographic Measurement measurement device two parts, and these two parts control through multi-way switch 10, completes respectively and measures Dual-Phrase Distribution of Gas olid concentration with electricity and optics.And because laser needs light by pipeline, so need to offer aperture or this part silica glass material pipeline at pipeline correspondence position.
(2) the narrow beam light that sends of described laser instrument 1, becomes uniform divergent beams through spatial filter 2, adds convex lens below at spatial filter 2, converges the light that spatial filter sends; Regulate convex lens position axially and the size of light beam, till making the light sent be parallel injection; Particle in following CCD camera 7 pairs of pipelines is taken, and will photograph picture and is transmitted on host computer (computing machine) by cable.
(3) described capacitance chromatography imaging device is on the cross section of any one pipeline, capacitor plate is arranged uniformly outside pipeline, when the fluid is flowing, two-plate can partner electric capacity, the medium of flowing in pipeline is by producing different specific inductive capacity during capacitor plate, also therefore create the capacitance of different size, by data acquisition system (DAS), capacitance is passed to preservation in host computer (computing machine).
(4), after the picture of CCD camera shooting in Laser Holographic Measurement device is carried out denoising, goes background by host computer (computing machine), three dimensions identification is carried out to particle, realizes measuring Dual-Phrase Distribution of Gas olid concentration; And host computer is analyzed the capacitance that capacitance chromatography imaging device records, use the concentration field of regularization algorithm to pipeline to complete reconstruction, achieve measurement of concetration.
(5) according to electricity and optics two kinds of methods, concentration is measured, compare, if both concentration values do not have obvious difference, then can obtain the concentration of dust in pipeline, otherwise, then need to carry out redefinition; In addition, a kind of measuring method can only be selected under specific occasion, then select a kind of measurement Dual-Phrase Distribution of Gas olid concentration.
Claims (3)
1. a device for integrated capacitive-laser measurement dust concentration, is characterized in that, this device be by data acquisition instrument and multi-way switch will be capacitance chromatography imaging device, Laser Holographic Measurement device is partly integrated with host computer three together with; The axis at its capacitance chromatography imaging measurement mechanism place is mutually vertical with the axis at Laser Holographic Measurement device place; In capacitance chromatography imaging measurement mechanism, sensor array is close to the outer wall of tested passage, and the perforate pipeline section of tested passage is placed between lens combination in Laser Holographic Measurement device light path and optical filter; Laser Holographic Measurement device is connected multi-way switch respectively with the input end of capacitance chromatography imaging device (ECT measurement mechanism), output terminal is connection data acquisition system respectively, host computer connects multi-way switch and data acquisition system (DAS) respectively, the device of composition integrated capacitive-laser measurement dust concentration; Wherein, graphical analysis and concentration analysis process are completed by host computer; Laser Holographic Measurement device does not interfere with each other because its measuring principle is different from capacitance chromatography imaging device, and both do not affect all states in passage all completely.
2. the device of a kind of integrated capacitive-laser measurement dust concentration according to claim 1, it is characterized in that, described capacitance chromatography imaging device is connected to form successively by capacitance sensor array, pumping signal, operational amplifier, ac amplifier circuit, solution mediation filtering circuit, and capacitance sensor array forms by multiple cross section outside tested pipeline is evenly arranged capacitor plate; When the fluid is flowing, arbitrary two-plate partners electric capacity, and in pipeline, the medium of flowing is by producing different specific inductive capacity during capacitor plate, also therefore creates the capacitance of different size, use the concentration field of regularization algorithm to pipeline to complete reconstruction, achieve measurement of concetration.
3. the device of a kind of integrated capacitive-laser measurement dust concentration according to claim 1, it is characterized in that, described Laser Holographic Measurement device is made up of laser instrument, spatial filter, lens combination, perforate pipeline section, optical filter and CCD camera; All elements are all on same axis.
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Cited By (4)
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| CN105628571A (en) * | 2016-03-29 | 2016-06-01 | 华北电力大学 | Fluidized bed mixed particle detection device and method based on electrostatic and photoelectric sensor |
| CN106323825A (en) * | 2016-10-26 | 2017-01-11 | 浙江大学 | Pipeline powdered coal particle size measuring device and measuring method |
| CN109490174A (en) * | 2018-09-25 | 2019-03-19 | 中国矿业大学 | Subparticle intelligent identification device and method for friction electrical selection |
| CN111398102A (en) * | 2020-03-31 | 2020-07-10 | 西安理工大学 | Method for measuring average speed of solid particles of gas-solid two-phase flow in pipeline |
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Cited By (6)
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| CN105628571A (en) * | 2016-03-29 | 2016-06-01 | 华北电力大学 | Fluidized bed mixed particle detection device and method based on electrostatic and photoelectric sensor |
| CN106323825A (en) * | 2016-10-26 | 2017-01-11 | 浙江大学 | Pipeline powdered coal particle size measuring device and measuring method |
| CN109490174A (en) * | 2018-09-25 | 2019-03-19 | 中国矿业大学 | Subparticle intelligent identification device and method for friction electrical selection |
| CN109490174B (en) * | 2018-09-25 | 2021-01-26 | 中国矿业大学 | Intelligent fine particle identification device and method for triboelectric separation |
| CN111398102A (en) * | 2020-03-31 | 2020-07-10 | 西安理工大学 | Method for measuring average speed of solid particles of gas-solid two-phase flow in pipeline |
| CN111398102B (en) * | 2020-03-31 | 2022-09-09 | 西安理工大学 | Method for measuring average speed of solid particles of gas-solid two-phase flow in pipeline |
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Inventor after: Liu Xia Inventor after: Liu Shi Inventor after: Liu Boyuan Inventor after: Ren Siyuan Inventor before: Liu Xia Inventor before: Liu Shi Inventor before: Ren Siyuan |
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Application publication date: 20150923 |