CN102435407B - Shooting system and method for shooting high-speed turbulence flowing image in wind tunnel test - Google Patents
Shooting system and method for shooting high-speed turbulence flowing image in wind tunnel test Download PDFInfo
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- CN102435407B CN102435407B CN201110260678.XA CN201110260678A CN102435407B CN 102435407 B CN102435407 B CN 102435407B CN 201110260678 A CN201110260678 A CN 201110260678A CN 102435407 B CN102435407 B CN 102435407B
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Abstract
The invention provides a shooting method for shooting a high-speed turbulence flowing image in a wind tunnel test. The shooting method comprises the following steps: starting a nano particle generator so as to enable the nano particle generator to uniformly and continuously put nano tracing particles in a wind tunnel experiment cabin; a computer system indicating a synchronous controller to send control signals; a multi-cavity pulse laser receiving the control signals sent by the synchronous controller and indicating a plurality of laser cavities of the multi-cavity pulse laser to sequentially send laser beams according to a first predetermined pulse time sequence, meanwhile an ultrahigh-speed camera receiving the control signals sent by the synchronous controller, and sequentially and continuously shooting and exposing according to a second predetermined pulse time sequence, wherein the second predetermined pulse time sequence has the same frequency with the first predetermined pulse time sequence, and an interval of every two adjacent pulse time sequences of the first and the second predetermined pulse time sequences is 0.2-10 microsecond.
Description
Technical field
The present invention relates to aviation field, especially, relate to a kind of camera system for shooting high-speed turbulence flowing image in wind tunnel test.In addition, the invention still further relates to a kind of method that comprises above-mentioned camera system.
Background technology
Along with the development of high-speed aircraft, aircraft aeroperformance, surface heat protection and the engineering technology problems such as control that flow are badly in need of high velocity turbulent flow fluidal texture to further investigate.
High velocity turbulent flow flows, and not only movement velocity is fast, and its mobile non-stationarity can cause fluidal texture to change fast in time.In addition, swiftly flowing compressible effect, three-dismensional effect also make fluidal texture very complicated.These all flow display technique very high requirement has been proposed.For above problem, article " the supersonic flows imaging based on nano particle " (Zhao Yuxin etc., Chinese science E collects, technological sciences, 2009,39 (12): 1911-1918) spike of a kind of employing nano particle has been proposed, the method (referred to as NPLS technology) of measuring for high velocity turbulent flow fluidal texture.This technology not only can, for the measurement to three-dimensional flow field, have hi-vision signal to noise ratio (S/N ratio) simultaneously, and the features such as hi-vision time and space resolution, can meet the measurement to high velocity turbulent flow fluidal texture.
Have movement velocity because high velocity turbulent flow is mobile fast, obtain the flow image that the seriation time changes, this just requires the time interval enough little (being generally microsecond magnitude) between every two width images.But existing NPLS technology is subject to the restriction of the hardware device performance such as laser instrument, CCD camera, can only obtain the flow image of two time points, and cannot obtain in a series of time periods, high velocity turbulent flow fluidal texture image that the time interval is enough little.
Summary of the invention
The camera system with very high-resolution high velocity turbulent flow flow image and method that the object of the invention is to provide a kind of can take within a series of time periods, the time interval reaches microsecond magnitude, can only obtain the flow image of two time points to solve, and cannot obtain in a series of time periods, the technical matters of high velocity turbulent flow fluidal texture image that the time interval is enough little.
For achieving the above object, according to an aspect of the present invention, a kind of camera system for shooting high-speed turbulence flowing image in wind tunnel test is provided, high velocity turbulent flow in wind tunnel experiment cabin is carried out to flow image shooting, comprise isochronous controller, connect isochronous controller and control isochronous controller the computer system and the nano particle generator that send control signal; Nano particle generator is for throwing in the trace particle of nanometer scale to wind-tunnel; The multi-cavity pulsed laser that is connected in isochronous controller, multi-cavity pulsed laser comprises several laser cavitys, each laser cavity launches according to the first predetermined pulse sequential the laser beam that illuminates wind tunnel experiment cabin flow field successively; And the hypervelocity camera of connection isochronous controller, hypervelocity camera is the shooting of the turbulent flow in ordered pair wind tunnel experiment cabin during according to the second predetermined pulse, the second predetermined pulse sequential is identical with the first predetermined pulse time sequence frequency, and is spaced apart 0.2 to 10 microsecond between every adjacent two pulse sequences of first and second predetermined pulse sequential.
Further, wind tunnel experiment cabin comprises optical window; The transmitting terminal of multi-cavity pulsed laser is provided with a smooth arm, and the laser beam of multi-cavity pulsed laser transmitting derives and forms projection light face via light arm, and projection light face illuminates the flow field in wind tunnel experiment cabin by optical window.
Further, optical window is arranged on each sidewall in wind tunnel experiment cabin.
Further, the camera lens of hypervelocity camera is taken the flow field structure in wind tunnel experiment cabin by the optical window of wind tunnel experiment cabin sidewall.
Further, light arm is extended to just to optical window by multi-cavity pulsed laser, the exit of light arm is provided with sheet optical lens group, and so that the laser beam of multi-cavity pulsed laser transmitting is deformed into planar light source, planar light source illuminates the flow field in wind tunnel experiment cabin by optical window.
Further, isochronous controller generates synchronizing pulse sequential; The first predetermined pulse sequential is determined based on synchronizing pulse sequential, and relative synchronizing pulse sequential time delay the first delay time; The second predetermined pulse sequential is determined based on synchronizing pulse sequential, and relative synchronizing pulse sequential time delay the second delay time; The second delay time is less than the first delay time, and the time of origin of arbitrary pulse of the first predetermined pulse sequential is positioned at the time of origin of the corresponding pulses of the second predetermined pulse sequential.
Further, the delay time of hypervelocity camera is adjustable.
According to a further aspect in the invention, a kind of image pickup method for shooting high-speed turbulence flowing image in wind tunnel test is also provided, and it comprises the steps: to open nano particle generator makes nano particle generator evenly in wind-tunnel Laboratory Module, throw in nanometer trace particle continuously; Indicate isochronous controller to send control signal by computer system; Multi-cavity pulsed laser is received after the control signal that isochronous controller sends, multiple laser cavitys of instruction multi-cavity pulsed laser are according to the first predetermined pulse sequential successively Emission Lasers bundle, simultaneously, hypervelocity camera is taken exposure successively continuously according to the second predetermined pulse sequential after receiving the control signal that isochronous controller sends, and the second predetermined pulse sequential is identical with the first predetermined pulse time sequence frequency; The turbulent flow image that computer system stores hypervelocity camera is taken successively continuously, and be spaced apart 0.2 to 10 microsecond between every adjacent two pulse sequences of first and second predetermined pulse sequential.
Further, after the corresponding turbulent flow image of taking of hypervelocity camera shooting exposure, be first stored in the buffer memory of hypervelocity camera; Transferring to afterwards computer system preserves again.
Further, computer system completes after turbulent flow image storage work, again indicates isochronous controller to send control signal; And computer system indicates isochronous controller to send the time shutter that minimum value that control signal and isochronous controller sent the time interval of control signal last time is greater than hypervelocity camera again.
The present invention has following beneficial effect: the present invention utilizes multi-cavity pulsed laser, has reduced the interval time between every adjacent twice laser beam, has ensured that the time interval between adjacent twice turbulent flow image is enough little.Utilize hypervelocity camera to take and obtain a series of high-resolution turbulent flow image.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Brief description of the drawings
The accompanying drawing that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the camera system for shooting high-speed turbulence flowing image in wind tunnel test of the preferred embodiment of the present invention;
Fig. 2 is that the use of the preferred embodiment of the present invention is for the schematic diagram of the method for the camera system of shooting high-speed turbulence flowing image in wind tunnel test; And
Fig. 3 is the signal sequence schematic diagram of the camera system for shooting high-speed turbulence flowing image in wind tunnel test of the preferred embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
Referring to Fig. 1, the present invention is used for the high velocity turbulent flow in wind tunnel experiment cabin 10 to carry out flow image measurement for the camera system of shooting high-speed turbulence flowing image in wind tunnel test.This camera system that is used for shooting high-speed turbulence flowing image in wind tunnel test comprises nano particle generator 20, multi-cavity pulsed laser 30, isochronous controller 40, hypervelocity camera 50 and computer system 60.
Each sidewall in wind tunnel experiment cabin 10 comprises an optical window 12, each sidewall of same section that is formed at wind tunnel experiment cabin 10 of these optical windows 12.Hypervelocity camera 50 sees through optical window 12 so that the turbulent flow in wind tunnel experiment cabin 10 is dynamically made a video recording.
The emission port of nano particle generator 20 is the entrance point to wind tunnel experiment cabin 10 just.The nano particle that nano particle generator 20 is thrown in enters wind tunnel experiment cabin 10, carries out spike with the high velocity turbulent flow in wind tunnel experiment cabin 10.Adopt nano particle as mobile trace particle, make the image of taking there is very high signal noise ratio (snr) of image and spatial resolution, made up the deficiency that existing similar camera system exists.
Multi-cavity pulsed laser 30 comprises several laser cavitys, and each laser cavity can compartment of terrain Emission Lasers bundle.The transmitting terminal of this multi-cavity pulsed laser 30 is fixed with a smooth arm 32.This light arm 32 extends to the top of multi-cavity pulsed laser 30, then bends the top of the optical window 12 that extends to wind tunnel experiment cabin 10, then is bent to form a just outlet to this optical window 12 to optical window 12.The exit of this light arm 32 is provided with sheet optical lens group 34, is deformed into planar light source with the laser beam that multi-cavity pulsed laser 30 is launched.Planar light source sees through optical window 12 and illuminates 10Nei flow field, wind tunnel experiment cabin.According to the principle of laser works, individual pulse laser instrument can not be launched multiple laser in a short period of time.Therefore, the present invention adopts multi-cavity pulsed laser 30 can in a short period of time or even launch multiple laser in microsecond magnitude.
Isochronous controller 40 connects respectively multi-cavity pulsed laser 30, hypervelocity camera 50 and computer system 60.Computer system 60 is sent instruction to isochronous controller 40, then controls multi-cavity pulsed laser 30 and hypervelocity camera 50 synchronous workings by isochronous controller 40.
The camera lens of hypervelocity camera 50 is by the optical window 12 on 10 sidewalls of wind tunnel experiment cabin, to carrying out the nano particle shooting of turbulent flow spike in wind tunnel experiment cabin 10.Hypervelocity camera 50 is also connected in computer system 60, so that store the each turbulent flow image of taking of hypervelocity camera 50 by computer system 60.Adopt hypervelocity camera can realize at short notice the shooting of several high-definition pictures.
The quantity of the high velocity turbulent flow fluidal texture image in a series of time periods that the each use of the camera system for shooting high-speed turbulence flowing image in wind tunnel test of the present invention can obtain is determined by the quantity of the laser cavity of multi-cavity pulsed laser 30 and the performance parameter of hypervelocity camera 50.The performance parameter of hypervelocity camera 50 comprises the work schedule that the operational mode of camera and camera internal hardware are set, that is: the time shutter of camera and by image transfer the time to register or buffer memory.
Incorporated by reference to reference to Fig. 2, use the method for the camera system for shooting high-speed turbulence flowing image in wind tunnel test of the present invention to have following step:
S1: open nano particle generator 20, make nano particle generator 20 evenly continuously to the interior input nanometer of wind-tunnel Laboratory Module 10 trace particle.
S2: send first control signal to isochronous controller 40 by computer system 60.
S3: incorporated by reference to reference 3, after multi-cavity pulsed laser 30 is received first control signal, each laser cavity is according to first
Predetermined pulse sequential is launched the laser beam that illuminates wind tunnel experiment cabin 10 flow fields successively; Hypervelocity camera 50 is pre-according to second
Determine pulse sequence to the turbulent flow shooting in wind tunnel experiment cabin 10, the second predetermined pulse sequential and the first predetermined pulse time sequence frequency
Identical.Between every adjacent two pulse sequences of first and second predetermined pulse sequential, be spaced apart 0.2 to 10 microsecond,
Good is 2 microseconds.
Wherein: a represents the work schedule of the control wave that isochronous controller 40 sends; B represents the work schedule of the laser beam that multi-cavity pulsed laser 30 sends; C represents the work schedule that hypervelocity camera 50 exposes.B and the c sequential a based on isochronous controller 40 determines.And b is with respect to a time delay the first delay time T1; C is with respect to a time delay the second delay time T2.
Multi-cavity pulsed laser 30 is received after first control signal, after the first delay time T1, is given off laser beam by the first laser cavity, and laser beam realizes sharp combiner by the optical module of multi-cavity pulsed laser 30 and becomes the first bundle laser beam.The first bundle laser beam is by light arm 32, and via the rear formation planar light source 342 of sheet optical lens group 34 in the exit of light arm 32, to illuminate wind tunnel experiment cabin 10.After nanometer trace particle in Ear Mucosa Treated by He Ne Laser Irradiation wind tunnel experiment cabin 10, scattering occurs, scattered light signal, by optical window 12, is accepted by high speed camera 50, to realize the shooting to turbulent flow.
Meanwhile, hypervelocity camera 50 is received after first control signal, after the second delay time T2, optical window 12 is taken to exposure work, to form the turbulent flow image in first moment.Hypervelocity camera 50 complete exposure after close, and by the turbulent flow Image Saving in above-mentioned first moment the buffer memory to hypervelocity camera 50.
In this step, the first delay time T1 is laser time delay; The second delay time T2 is camera delay time.Laser T1 time delay that launches every a branch of laser beam is generally determined by this multi-cavity pulsed laser 30, so can be by adjusting the camera delay time T2 of hypervelocity camera 50, to ensure that every a branch of laser beam that multi-cavity pulsed laser 30 sends is just in time in the time range in the 50 corresponding exposures of hypervelocity camera.
S4: the turbulent flow image transmitting in first moment in the buffer memory of hypervelocity camera 50, to computer system 60, and is stored to the turbulent flow image of hypervelocity camera 50 this shootings by computer system 60.
S5: judge whether the turbulent flow image storage work in completing steps S4 by computer system 60.Judge compared with the moment of sending first control signal with isochronous controller 40 whether passed through the time interval of Δ t simultaneously.
After above-mentioned judged result is and is, computer system 60 starts to send second control signal to isochronous controller 40, starts circulation step S3 to S5, to all having launched laser beam to all laser cavitys of multi-cavity pulsed laser 30.
It should be noted that: the time interval that isochronous controller 40 sends between two adjacent control signals is Δ t, be the time interval between every adjacent two turbulent flow images in a series of time periods.Δ t can regulate by isochronous controller 40.For avoiding laser beam imaging in the upper once exposure process of hypervelocity camera 50 in next moment, the minimum value of Δ t must be greater than the time shutter of hypervelocity camera 50, and when ensureing that lower beam of laser is sent, the last exposure of hypervelocity camera 50 finishes.
The present invention utilizes multi-cavity pulsed laser 30, has reduced the interval time between every adjacent twice laser beam, thereby has effectively reduced Δ t, has ensured that the time interval between adjacent twice turbulent flow image is enough little.Can take and obtain a series of high-resolution turbulent flow image.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. for an image pickup method for shooting high-speed turbulence flowing image in wind tunnel test, it is characterized in that, comprise the steps:
Opening nano particle generator makes described nano particle generator evenly in wind-tunnel Laboratory Module, throw in nanometer trace particle continuously;
Indicate isochronous controller to send control signal by computer system;
Multi-cavity pulsed laser is received after the control signal that described isochronous controller sends, indicate multiple laser cavitys of described multi-cavity pulsed laser according to the first predetermined pulse sequential successively Emission Lasers bundle, simultaneously, hypervelocity camera is taken exposure successively continuously according to the second predetermined pulse sequential after receiving the control signal that described isochronous controller sends, described the second predetermined pulse sequential is identical with described the first predetermined pulse time sequence frequency, and is spaced apart 0.2 to 10 microsecond between every adjacent two pulse sequences of described first and second predetermined pulse sequential;
The time interval that isochronous controller sends between two adjacent control signals is Δ t, is the time interval between every adjacent two turbulent flow images in a series of time periods, and the minimum value of Δ t is greater than the time shutter of hypervelocity camera;
The turbulent flow image that described in described computer system stores, hypervelocity camera is taken successively continuously;
Multi-cavity pulsed laser is received after first control signal, after the first delay time T1, is given off laser beam by the first laser cavity, and laser beam realizes sharp combiner by the optical module of multi-cavity pulsed laser and becomes the first bundle laser beam;
The first bundle laser beam is by light arm, and forms planar light source after sheet optical lens group via the exit of light arm, to illuminate wind tunnel experiment cabin;
After nanometer trace particle in Ear Mucosa Treated by He Ne Laser Irradiation wind tunnel experiment cabin, scattering occurs, scattered light signal, by optical window, is accepted by high speed camera, to realize the shooting to turbulent flow.
2. the image pickup method for shooting high-speed turbulence flowing image in wind tunnel test according to claim 1, is characterized in that,
After the described corresponding turbulent flow image of taking of described hypervelocity camera shooting exposure, be first stored in the buffer memory of described hypervelocity camera;
Transferring to afterwards described computer system preserves again.
3. the image pickup method for shooting high-speed turbulence flowing image in wind tunnel test according to claim 2, is characterized in that,
Described computer system completes after described turbulent flow image storage work, again indicates described isochronous controller to send control signal;
And the minimum value that described computer system indicates described isochronous controller to send control signal again and described isochronous controller sent the time interval of control signal last time is greater than the time shutter of described hypervelocity camera.
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| CN109724765B (en) * | 2019-03-13 | 2024-03-22 | 中国人民解放军国防科技大学 | Shooting system and method for high-speed wind tunnel serialization flow image |
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