CN104914078A - Large-range multi-point fluid concentration measuring system - Google Patents
Large-range multi-point fluid concentration measuring system Download PDFInfo
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- CN104914078A CN104914078A CN201510179978.3A CN201510179978A CN104914078A CN 104914078 A CN104914078 A CN 104914078A CN 201510179978 A CN201510179978 A CN 201510179978A CN 104914078 A CN104914078 A CN 104914078A
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Abstract
The invention discloses a multi-point fluid concentration measuring system. The multi-point fluid concentration measuring system comprises a laser subsystem, an image acquisition subsystem, an image analysis subsystem and a rating system, wherein the laser subsystem comprises a fluorescent agent for accurately measuring a tracer material in a fluid field, a continuous laser adapting to the absorption/emission spectrum of the fluorescent agent according to the type of the fluorescent agent, and a continuous laser scanning system for controlling the laser irradiation point position, controlling the pulse energy and the pulse repeating rate, and controlling the quantity and distribution of scanning spot arrays. Laser is scanned to a two dimensional measuring plane to excite the fluorescent tracer material in water, a camera provided with a long pass filter shoots the intensity of fluorescence released by the fluorescent substance, and the fluorescent substance concentration at a specific point can be accurately measured through a relevant algorithm. The multi-point fluid concentration measuring system has the advantages of short device installation time, tilting measurement, no disturbance, concise laying, one-time measurement of the large range concentration distribution, no disturbance or influences on fluids, and simple and fast data acquisition.
Description
Technical field
The present invention relates to a kind of flow measurement system, particularly relate to one multipoint stream bulk concentration measuring system on a large scale.
Background technology
PLIF(Planar Laser Induced Fluorescence) principle refers to and utilizes laser that specific molecular is excited to excited state by electronic ground state, measure the photon that molecule is continued by excited electronic state to release after a while, the wavelength of laser is by the absorption band of molecule, just fluorescence intensity can be depicted as the function of excitation laser wavelength, obtain excitation spectrum.From the power of fluorescence spectrum, concentration and the temperature of particle can be learnt; Utilize its spatial discrimination can also measure the spatial concentration/Temperature Distribution of particle.But in the prior art, traditional PLIF can only measure plane and density distribution among a small circle, and spot measurement sensor can only obtain concentration value by contact single-point, or needs to lay a lot of probe by surveying bridge, result in measure inefficiency and measure cost high, can not meet the demand of people.
Summary of the invention
The object of the present invention is to provide one multipoint stream bulk concentration measuring system on a large scale, optically disposable measurement concentration can distribute, solve the shortcoming that prior art exists.
The present invention adopts following technical scheme to realize:
One is multipoint stream bulk concentration measuring system on a large scale, it is characterized in that, comprises laser subsystem, image acquisition subsystem, image analysis subsystem and rate fixed system, wherein:
The fluorescer for accurately measuring probe material in flow field is comprised in described laser subsystem, and according to the continuous wave laser that type and its absorption/emission spectrum characteristics of fluorescer adapt, also comprise continuous laser scanning system, described continuous laser scanning system for controlling illuminated laser spot position, the quantity of gating pulse energy and repetition rate, scanning lattice and distribution;
One or more high-resolution industrial camera being provided with CCD/CMOS is comprised in described image acquisition subsystem, this industrial camera can trigger by external trigger or by software, described industrial camera carries out control collection by microcontroller, industrial camera is erected at the fluoroscopic image of top for acquisition and recording laser projection place of open channel tank/test model, go forward to be equipped with long logical optical filtering at CCD/CMOS camera sensitive chip, the effect of long logical optical filtering intercepts other insoluble substances in solution, to the reflection of laser, to focus according to field size and laying condition; CCD (Charge-coupled Device) i.e. charge coupled cell, also referred to as ccd image sensor or image controller.CCD is a kind of semiconductor devices, optical image can be converted into digital signal.CCD is widely used in digital photography especially optical telemetry technology, optics and frequency spectrum telescope and high speed photography.
Described image analysis subsystem comprises one is carried out Long-distance Control computing machine by microcontroller, is provided with concentration field measurement software in computing machine;
Calibration tank is provided with, diaphragm system, the accurate titration system of spike in described rate fixed system.
Further, described fluorescer is uranine yellow salt.
Further, described length leads to optical filtering is the long logical optical filtering of 500-600nm.
Further, in described image acquisition subsystem, be provided with wifi/3G/4G/ZigBee, for carrying out controlled in wireless and data transmission.
Further, the frequency acquisition of described industrial camera is 10-100FPS, and the time shutter of every frame is 1-100ms.
The present invention is the contactless measuring system on a large scale based on modern laser, fluorescent technique and image processing techniques.Laser to two-dimensional measurement plane, excites the fluorescent tracing material in water by three-dimensional vibration mirror scanning, and the fluorescence intensity discharged by the camera crawl fluorescent material being equipped with long logical optical filtering, can measure the fluorescent material concentration of specified point accurately by related algorithm.Compare additive method, the contactless feature of multiple spot concentration measurement system makes the used time of erecting equipment shorter, undisturbed and lay succinct, can measure concentration distribution once, and disturbance and impact can not be produced by convection cell, obtain data more simple and easy and quick.
Accompanying drawing explanation
Fig. 1 is the absorption/release spectrogram of uranine yellow salt solusion.
Fig. 2 is the RhodamineWT concentration-time sequence curve by laser projection point.
Embodiment
By below to the description of embodiment; to more contribute to public understanding the present invention; but the restriction that the specific embodiment given by applicant can't be considered as technical solution of the present invention, any definition to parts or technical characteristic change and/or to one-piece construction do form and immaterial conversion all should be considered as the protection domain that technical scheme of the present invention limits.
The present invention is based on PLIF(Planar Laser Induced Fluorescence) principle, utilize laser that specific molecular is excited to excited state by electronic ground state, measure the photon that molecule is continued by excited electronic state to release after a while, the wavelength of laser is by the absorption band of molecule, just fluorescence intensity can be depicted as the function of excitation laser wavelength, and then obtain excitation spectrum.Concentration and the temperature of particle can be learnt from the power of fluorescence spectrum; Utilize its spatial discrimination can also measure the spatial concentration/Temperature Distribution of particle.
A kind of multiple spot concentration fluid measuring system, comprise laser subsystem, image acquisition subsystem, image analysis subsystem and rate fixed system, wherein: in laser subsystem, comprise the fluorescer for accurately measuring probe material in flow field, and according to the continuous wave laser that type and its absorption/emission spectrum characteristics of fluorescer adapt, also comprise continuous laser scanning system, continuous laser scanning system for controlling illuminated laser spot position, the quantity of gating pulse energy and repetition rate, scanning lattice and distribution.In the present embodiment, fluorescer is preferably uranine yellow salt (Fluorescein) solution, and as shown in Figure 1, its peak absorbtivity wavelength is 480nm to the absorption release spectrogram of uranine yellow salt solusion, and fluorescence release peak wavelength is 520nm.PLIF system can adopt 450nm, 2W continuous semiconductor laser instrument to carry out fluorescence excitation solution.
Fluorescer can produce fluorescence under laser excitation, and fluorescence intensity is relevant with laser intensity, fluorescer concentration etc., according to Beer-Lambert equation:
Wherein I
0for laser intensity, I
ffor fluorescence intensity, A is fluorescer concentration.Known accordingly when other parameters are fixing, fluorescence intensity and fluorescer concentration are directly proportional, and measuring fluorescence intensity can reflect stin of thickness.
Comprise the high-resolution industrial camera that is provided with CCD in image acquisition subsystem, the frequency acquisition of industrial camera is 30FPS, and the time shutter of every frame is 10ms.This industrial camera can trigger by external trigger or by software, industrial camera carries out control collection by microcontroller, industrial camera is erected at the fluoroscopic image of top for acquisition and recording laser projection place of open channel tank, go forward to be equipped with long logical optical filtering at CCD camera sensitive chip, preferably the length of 510nm leads to optical filtering in the present embodiment, the effect of long logical optical filtering intercepts other insoluble substances in solution, to the reflection of laser, to focus according to field size and laying condition; If select other fluorescent solutions, then reselect corresponding right laser instrument and long logical optical filtering according to absorption/characteristic spectral emission.Image analysis subsystem comprises one is carried out Long-distance Control computing machine by microcontroller, is provided with concentration field measurement software (Nanjing Hao Kong software engineering company limited Hawksoft, Ltd produce) in computing machine; Being provided with circulation channel flow tank in rate fixed system, also comprising the essential tool such as graduated cylinder, test tube, analytical balance, buret, stirring rod, in image acquisition subsystem, be provided with wifi, running and data transmission for carrying out wireless control system.
Related experiment is proved:
Experiment is carried out in circulation channel flow tank, and choosing Rhodamine WT solution is fluorescent tracing material.According to the absorption-characteristic spectral emission of Rhodamine WT, adopt 532nm laser excitation, the length adding 590nm before camera lens leads to optical filtering obstruct laser light scattering, makes camera CCD only responsive to red fluorescence.In Open Channels, average current velocity is 0.42m/s, and the depth of water is 10cm.After flow constant, add Rhodamine WT solution at open channel tail vat, solution is flowed by circulating line and mixes rear inflow pond, open channel upstream, and recycle flows in canal.CCD camera is erected at the fluoroscopic image noting down laser projection place above open channel.The frequency acquisition of camera is 30 FPS, and every auspicious time shutter is 10ms.In practical application, the time shutter optionally can increase (when concentration is lower) or reduce (when concentration is higher), to strengthen the dynamic range of measurement.
Fig. 2 surveys by laser projection point the curve of concentration changes with time.Survey concentration by demarcate, unit is (ppb).Near measurement point, (10cm place, downstream) also placed standard fluorometer (U.S. Turner Design Cyclops Submersible Fluoremeter), for contrast verification.Standard fluorometer sample frequency is 1/3 hertz.This time-serial position shows classical one dimension turbulence discrete (Dispersion) expected result, i.e. an asymmetrical Gaussian curve.When second peak arrives (circulating), its peak value reduces about 50%, and the dispersion of distribution also significantly increases.The mistiming of two minor peaks is about 100s, and the mean flow rate calculated thus is 0.39 m/s, coincide with flowmeter institute velocity measurement.The display of this demonstration test can reach the accuracy of measurement of standard fluorometer by the LIF measurement result of laser projection point mode.
Scope multiple spot LIF measurement of concetration is tested:
Experiment is carried out on hydraulic model, measures area and is approximately 10*10m.Instrument stand is located at experimental tank bank, the about 2m of distance water surface vertical height.Sow high concentration fluorescer from upstream, fluorescer, with flow expansion, is approximately one dimension diffusion problem, can think that concentration of profile is distributed as Gaussian distribution away from the position of sowing a little.Laser is by galvanometer by certain frequency sweeping, and be radiated in water the point needing to measure, fluorescence excitation agent sends fluorescence, and camera gathers image to water surface, and in the image obtained, the gray-scale value of measurement point can reflect the power of exciting light.Experimental period is 200s, record per second 20 images, often opens 15 points of image exposuring time inner laser scanning same profile.
Experiment scans 20 sections altogether, and wherein effective position is 15, suppose that current flow direction is x direction, and section is parallel with y direction.Each measurement point measures 200 groups of data respectively, calculates the mean concentration of each point.
Carrying out interpolation to testing the data point recorded, can obtain cloud atlas, interpolation method uses Natural Neighbor Interpolation.The formula of Natural Neighbor Interpolation is as follows:
Wherein x
iand y
ifor the point recorded, ω
ifor a corresponding weights.
Choose the experimental result away from point of release, carry out Gauss curve fitting to data, measurement result meets Gaussian distribution substantially simultaneously, meets experiment expection.
Concentration field measurement system parameter table:
Certainly; the present invention can also have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art can make various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection domain that all should belong to the claim appended by the present invention.
Claims (5)
1. a multipoint stream bulk concentration measuring system on a large scale, is characterized in that, comprise laser subsystem, image acquisition subsystem, image analysis subsystem and rate fixed system, wherein:
The fluorescer for accurately measuring probe material in flow field is comprised in described laser subsystem, and according to the continuous wave laser that type and its absorption/emission spectrum characteristics of fluorescer adapt, also comprise continuous laser scanning system, described continuous laser scanning system for controlling illuminated laser spot position, the quantity of gating pulse energy and repetition rate, scanning lattice and distribution;
Comprise one or more high-resolution industrial camera being provided with CCD/CMOS in described image acquisition subsystem, described industrial camera carries out control collection by microcontroller, goes forward to be equipped with long logical optical filtering at CCD/CMOS camera sensitive chip;
Described image analysis subsystem comprises one is carried out Long-distance Control computing machine by microcontroller, is provided with concentration field measurement software in computing machine;
Described rate fixed system comprises and is one or morely provided with calibration tank, diaphragm system, the accurate titration system of spike.
2. the bulk concentration of multipoint stream on a large scale measuring system according to claim 1, it is characterized in that, described fluorescer is uranine yellow salt.
3. the bulk concentration of multipoint stream on a large scale measuring system according to claim 1 and 2, is characterized in that, it is the long logical optical filtering of 500-600nm that described length leads to optical filtering.
4. the bulk concentration of multipoint stream on a large scale measuring system according to claim 3, is characterized in that, be provided with wifi/3G/4G/ZigBee in described image acquisition subsystem, for carrying out controlled in wireless and data transmission.
5. the bulk concentration of multipoint stream on a large scale measuring system according to claim 3, is characterized in that, the frequency acquisition of described industrial camera is 10-100FPS, and the time shutter of every frame is 1-100ms.
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Cited By (3)
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| TWI676792B (en) * | 2018-08-27 | 2019-11-11 | 中華精測科技股份有限公司 | Wireless, real time laser measurement device for detecting liquid concentration |
| CN111122526A (en) * | 2019-12-18 | 2020-05-08 | 中国科学院南海海洋研究所 | Water algae detection method based on laser-induced fluorescence and fluid dynamic photomicrography |
| CN111610173A (en) * | 2020-05-27 | 2020-09-01 | 中国水利水电科学研究院 | Three-dimensional fluid concentration field calibration device and calibration method |
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| CN111122526A (en) * | 2019-12-18 | 2020-05-08 | 中国科学院南海海洋研究所 | Water algae detection method based on laser-induced fluorescence and fluid dynamic photomicrography |
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Application publication date: 20150916 |