CN203705468U - Novel surface flow field velocimetry system based on infrared photography - Google Patents
Novel surface flow field velocimetry system based on infrared photography Download PDFInfo
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- CN203705468U CN203705468U CN201320881848.0U CN201320881848U CN203705468U CN 203705468 U CN203705468 U CN 203705468U CN 201320881848 U CN201320881848 U CN 201320881848U CN 203705468 U CN203705468 U CN 203705468U
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Abstract
The utility model relates to a novel surface flow field velocimetry system based on infrared photography. The system comprises a water flow experiment pool. A model river is arranged along the length direction of the water flow experiment pool. An experiment water flow inlet of the model river is positioned at one end of the water flow experiment pool in the length direction, and an experiment water flow outlet of the model river is positioned at the other end of the water flow experiment pool in the length direction. Ice grain tracing particles for tracing the surface flow field are arranged in the model river. An image acquisition device is disposed above the model river, and is connected with a data acquisition and processing computer through a data connection line. According to the novel surface flow field velocimetry system and method provided by the utility model, the application effects of PTV in complex light environment and complex water-sand environment are greatly improved, and the surface flow field velocimetry is achieved with environment friendship, convenience and fastness.
Description
Technical field
The utility model relates to a kind of surface flow field velocity-measuring system.Particularly relate to a kind of novel surface flow field velocity-measuring system based on infrared photography testing the speed for river model test water surface flow field.
Background technology
Indoor physical experiments is the important means of hydraulic engineering Study on Problems, especially in recent years aspect river evolvement simulation, there are at present a large amount of researchers to utilize pond in laboratory to carry out moulding of fluvial morphology both at home and abroad, utilize bending in river simulating nature circle of manually moulding, to divide the branch of a river and the type river of going around differentiation, the rule developing to study fluvial morphology.In all water conservancy projects, river model experiment, the measurement of flow rate of water flow is one of of paramount importance measurement key element.
At present, the measuring method of flow rate of water flow is mainly divided into two large classes: the one, and single-point fluid-velocity survey: for example traditional propeller type current meter or apply at present more acoustic Doppler velocimetry (ADV).But propeller type current meter measuring accuracy is lower, and acoustic Doppler velocimetry (ADV) is owing to there being minimum investigation depth (being generally 5cm), is not often suitable for shallow-water environment.In addition, Single-point velocity determination, because surveying work amount is too large, often can not be competent at the river model real-time measurement in flow field on a large scale.Equations of The Second Kind method is the flow field velocimetry based on particle picture, for example extensively adopt at present particle tracking image velocimetry (PTV), by the trace particle that is sprinkled into water surface is carried out to real time image collection, and the image gathering is carried out to particle identification, coupling and tracking, realize the Quick Measurement of flow field velocity on a large scale.The method has efficient feature, obtain and widely applied and further investigation, for example, patent of invention " solid model surface flow field real-time measurement system and post-processing approach thereof " (application number: 200910076713.5) disclose one flood control solid model testing surface flow field real-time measurement system and the post-processing approach thereof in water conservancy measurement technology field.Its technical scheme is that tracer grain is evenly scattered in water surface and makes it follow water movement, video camera is installed on the top of surface flow field and realizes outer synchronous by audio video synchronization device, the picture signal of movement of particles transfers to collecting image of computer card by video line and carries out analyzing and processing, obtains flow field velocity and fluidised form.Patent of invention " contactless river surface flow field imaging method for measurement " (application number: 201210346488.4) disclose a kind of contactless river surface flow field imaging method for measurement, realize near infrared imaging by install near infrared filter additional before imageing sensor, strengthen the brightness contrast between current tracer and water surface background, and by image is carried out to spatial domain high-pass filtering, suppress water surface optical noise; Then adopt fast Flourier cross correlation algorithm to carry out estimation of motion vectors, obtain the displacement vector of each analyzed area, finally realize the surface flow field Quick Measurement in occurring in nature river.
Limited by laboratory condition, current existing particle tracking image tests the speed (PTV) system in actual applications, still has many-sided problem and challenge.First, general large-scale water conservancy project, river model laboratory inner model range of size are very large, and the light of water surface generally comprises the available light from experiment window, and the light of interior lighting system, light source variation and at random.In this case, be difficult to accomplish that the light of block mold water surface is even, actual water surface is often presenting the phenomenons such as light source inverted image is overlapping, the inhomogeneous reflection of light some observation on angle., flow rate of water flow more shallow in the depth of water is large (your the moral number that boils is larger) in the situation that, and the water surface generally also there will be external waviness, presents the effect that gleams of light are reflecting on waves in the river.In this case, the particle picture quality degradation that camera system is obtained, is difficult to identify exactly the trace particle in image.Secondly, the making of trace particle, shed with reclaimer operation process and have inconvenient part.Trace particle General Requirements density is slightly less than water body, to obtain preferably with water-based, the trace particle adopting at present generally becomes specific shape by certain material in factory process, for example, utility model " the high-performance trace particle of solid model surface flow field image measurement " (application number: 200720036750.X) adopts ABS material or PP material to become density close with Experimental Flowing Object with plaster of paris hybrid modulation, suppress with mould, ABS material or PP material are mixed with the plaster of paris, then adopt stirring machine modulation evenly, the mould inner pressure system of injection forms.Special trace particle must reclaim, otherwise can cause the waste of material and the environmental pollution of experiment reservoir, and some can cause the long-term pollution of reservoir unavoidably because reclaiming not exclusively the particle that leaks into reservoir with water.Again, develop physical model experiment for a large amount of rivers, for example flexure type, point branch of a river type and the type river evolvement simulation of going around, measured zone often exists a large amount of beaches, continent at random to distribute, if adopt traditional trace particle speed-measuring method, will have a large amount of particles to be gathered in river course seashore part, make flow field survey result become chaotic, in addition, throw loose trace particle by prolonged stay in seashore place or recirculating zone, brought challenge to the recovery of particle.
Summary of the invention
Technical problem to be solved in the utility model is, a kind of novel surface flow field velocity-measuring system based on infrared photography is provided, utilize disposable Low-temperature Ice particle to replace the material trace particles such as traditional plastics, the effect of PTV in complicated light environment, the husky environment of complicated water can be greatly improved, and environmental friendliness, surface flow field measurement easily and efficiently can be realized.
The technical scheme that the utility model adopts is: a kind of novel surface flow field velocity-measuring system based on infrared photography, include current experiment pond, length direction along described current experiment pond is provided with model stream, the experiment flow inlet of described model stream is positioned at one end of described current experiment pond length direction, the experiment water export of described model stream is positioned at the other end of described current experiment pond length direction, in described model stream, be provided with the ice particle trace particle for carrying out surface flow field spike, the top of described model stream is provided with image collecting device, described image collecting device gathers and process computer by data connecting line connection data.
On described model stream, be provided with flow field survey region, described image collecting device is arranged on the top in described flow field survey region.
Described image collecting device is arranged on 3～7m eminence directly over described flow field survey region.
Described image collector is set to infrared camera or industrial thermal infrared imager.
Novel surface flow field velocity-measuring system based on infrared photography of the present utility model, can greatly improve the effect of PTV in complicated light environment, the husky environment of complicated water, and can realize environmental friendliness, surface flow field measurement easily and efficiently.There is following beneficial effect:
1, adopt infrared camera technology, in conjunction with ice particle Particle-beam Tracing, effectively avoided that water surface laboratory in is reflective, the interference to particle picture quality such as ripple, make measurement not affected by laboratory light environment.Count river model experiment for your moral of boiling of shallow water, the height with external waviness, traditional particle image speed-measuring system often can not be suitable for, and the technology still can be suitable for.
2, trace particle adopts special ice particle, because the density of ice is slightly larger than water, can freely float over water surface, has good in water-based.In the temperature of ice and common laboratory, water temperature differs 10～20 DEG C, can on infrared image, produce good resolution with background.
3, ice particle trace particle, flowing through behind experiment measuring region, leaks into gathering ground, and is finally melted in water body, without recovery, and can not produce environmental pollution to laboratory reservoir.In addition, trace particle only needs freezing equipment and corresponding mould to prepare, and cost is very low.There is easy to use, environmental protection, advantage cheaply.
4, develop physical model experiment for river, for example flexure type, point branch of a river type and the type river evolvement simulation of going around, measured zone often exists a large amount of beaches, continent at random to distribute, if adopt traditional trace particle speed-measuring method, to there is a large amount of particles to be gathered in river course seashore part, make flow field survey result become chaotic, in addition, throw loose trace particle by prolonged stay in seashore place or recirculating zone, be difficult to reclaim.And utilize ice particle as trace particle, and can ingeniously utilize the thawing of ice particle, avoid this problem.
5, in ice particle melting process, particle diameter and surface temperature will change in time gradually, coordinate identification, the feature extraction of particle by infrared photography, can last and carry out guestimate the motion of particle, contribute to understand flow field, whole river situation from macroscopic perspective, for river model experiment provides the valuable data message except flow velocity.
Brief description of the drawings
Fig. 1 is the structural representation of the novel surface flow field velocity-measuring system of the utility model based on infrared photography, in figure,
1: current experiment pond 2: model stream
3: experiment flow inlet 4: experiment water export
5: flow field survey region 6: ice particle trace particle
7: image collecting device 8: data connecting line
9: data acquisition and process computer
Embodiment
Below in conjunction with embodiment and accompanying drawing, the novel surface flow field velocity-measuring system based on infrared photography of the present utility model is described in detail.
As shown in Figure 1, a kind of novel surface flow field velocity-measuring system based on infrared photography of the present utility model, include current experiment pond 1, length direction along described current experiment pond 1 is provided with model stream 2, on described model stream 2, be provided with flow field survey region 5, the experiment flow inlet 3 of described model stream 2 is positioned at one end of described current experiment pond 1 length direction, the experiment water export 4 of described model stream 2 is positioned at the other end of described current experiment pond 1 length direction, in described model stream 2, be provided with the ice particle trace particle 6 for carrying out surface flow field spike, the top of described model stream 2 is provided with image collecting device, described image collecting device is by data connecting line 8 connection data collections and process computer 9.Described image collecting device is arranged on 3～7m eminence directly over described flow field survey region 5.Described image collecting device 7 can adopt infrared camera or industrial thermal infrared imager.
The image collecting will directly reflect the Temperature Distribution of test block, and the temperature sense sensitivity of current industrial thermal infrared imager is generally the scope of 0.1～1 DEG C.Trace particle adopts ice hockey particle, and particle diameter is determined according to experiment flow field scope and measuring accuracy, the general scope at 0.5～1cm.The surface temperature of ice particle trace particle is about 0 DEG C or lower, and around the temperature of water body changes with laboratory room temperature, generally 10～20 DEG C of scopes, can produce thus between ice particle trace particle and flow field the temperature difference of 10～20 DEG C, on infrared photography picture, there is obvious discrimination, be easy to be identified.Ice particle trace particle can be thrown by manual or special device loose, throw loose after ice particle trace particle will in current, flow and simultaneously naturally thawing or finally flow into reservoir after melt, therefore do not need to carry out the recovery of particle.The time that the ice particle trace particle of considering diameter 1cm melts completely in the water of 20 DEG C of temperature is about 5 minutes, universal model experiment flow rate of water flow is at 0.1～0.5m/s, the effective range ability of particle in current can reach about 30m～150m, can meet measurement range requirement.The temperature pattern that infrared image pickup device collects will be sent to computing machine in real time, and by computer software carry out that image is cut apart, particle identification, coupling, tracking and coordinate conversion, finally obtain real-time surface flow field.
In experimentation, the execution flow process of package unit comprises the steps:
(1) before experiment, prepare a large amount of ice hockey particle trace particles, and carry out refrigerated storage, in order to using in experiment;
(2) in current experiment pond 1, test, set up the model stream 2 that needs research, comprise experiment flow inlet 3, experiment water export 4, determine flow field survey region 5;
(3) about 3～7m eminence directly over flow field survey region 5, installs image collecting device 7, and utilizes the 8 connection data collections of data connecting line road and process computer 9, and corresponding software systems are installed, and completes the installation of whole velocity-measuring system;
(4) carry out current experiment, and throw loose ice hockey particle trace particle at experimentation in 5 upstreams, flow field survey region, move computed image collection and data processor simultaneously, carry out the real-time measurement of flow field velocity data;
(5) ice hockey particle trace particle is flowing through thawing naturally after measured zone, without manual recovery.
Claims (4)
1. the novel surface flow field velocity-measuring system based on infrared photography, include current experiment ponds (1), it is characterized in that, length direction along described current experiment ponds (1) is provided with model stream (2), the experiment flow inlet (3) of described model stream (2) is positioned at one end of described current experiment pond (1) length direction, the experiment water export (4) of described model stream (2) is positioned at the other end of described current experiment pond (1) length direction, in described model stream (2), be provided with the ice particle trace particle (6) for carrying out surface flow field spike, the top of described model stream (2) is provided with image collecting device (7), described image collecting device (7) is by data connecting line (8) connection data collection and process computer (9).
2. the novel surface flow field velocity-measuring system based on infrared photography according to claim 1, it is characterized in that, on described model stream (2), be provided with flow field survey region (5), described image collecting device (7) is arranged on the top in described flow field survey region (5).
3. the novel surface flow field velocity-measuring system based on infrared photography according to claim 2, is characterized in that, described image collecting device (7) is arranged on 3～7m eminence directly over described flow field survey region (5).
4. according to the novel surface flow field velocity-measuring system based on infrared photography described in claim 1 or 2 or 3, it is characterized in that, described image collecting device (7) is infrared camera or industrial thermal infrared imager.
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| CN201320881848.0U CN203705468U (en) | 2013-12-26 | 2013-12-26 | Novel surface flow field velocimetry system based on infrared photography |
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| CN201320881848.0U CN203705468U (en) | 2013-12-26 | 2013-12-26 | Novel surface flow field velocimetry system based on infrared photography |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698553A (en) * | 2013-12-26 | 2014-04-02 | 天津大学 | Novel surface flow field velocity measurement system and velocity measurement method on basis of infrared image pickup |
| CN104569486A (en) * | 2015-01-16 | 2015-04-29 | 东南大学 | Hot air speed sensing system composed of infrared image sensor |
| CN104820112A (en) * | 2015-04-24 | 2015-08-05 | 华南理工大学 | Plant leaf vein flow velocity measurement device and method |
| CN109612685A (en) * | 2019-01-15 | 2019-04-12 | 西南交通大学 | For the flow velocity of flume test and the integrated measurer of depth and method |
| WO2022017501A1 (en) * | 2020-07-24 | 2022-01-27 | International Business Machines Corporation | Evaluation of flow properties in physical media |
-
2013
- 2013-12-26 CN CN201320881848.0U patent/CN203705468U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698553A (en) * | 2013-12-26 | 2014-04-02 | 天津大学 | Novel surface flow field velocity measurement system and velocity measurement method on basis of infrared image pickup |
| CN104569486A (en) * | 2015-01-16 | 2015-04-29 | 东南大学 | Hot air speed sensing system composed of infrared image sensor |
| CN104820112A (en) * | 2015-04-24 | 2015-08-05 | 华南理工大学 | Plant leaf vein flow velocity measurement device and method |
| CN104820112B (en) * | 2015-04-24 | 2018-01-05 | 华南理工大学 | A kind of device and method of plant leaf vein flow velocity measurement |
| CN109612685A (en) * | 2019-01-15 | 2019-04-12 | 西南交通大学 | For the flow velocity of flume test and the integrated measurer of depth and method |
| WO2022017501A1 (en) * | 2020-07-24 | 2022-01-27 | International Business Machines Corporation | Evaluation of flow properties in physical media |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140709 Termination date: 20141226 |
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