CN1225668C - Digital two dimensional color schlieren light source and flow field display method - Google Patents
Digital two dimensional color schlieren light source and flow field display method Download PDFInfo
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- CN1225668C CN1225668C CN 200310106553 CN200310106553A CN1225668C CN 1225668 C CN1225668 C CN 1225668C CN 200310106553 CN200310106553 CN 200310106553 CN 200310106553 A CN200310106553 A CN 200310106553A CN 1225668 C CN1225668 C CN 1225668C
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Abstract
The present invention relates to a digital two-dimensional color schlieren light source and a flow field display method, which is used for a two-dimensional color schlieren apparatus for flow field display. In the present invention, a diffuser screen 4 and a light screen 5 are stuck together tightly; an optical bench 6 is respectively arranged at the lower parts of a digital color projector 2, a convergence lens 3 and the integrated diffuser screen 4 and light screen 5; the three optical benches 6 are respectively movably connected and are arranged on the same optical track 7; the light axis centers of the digital color projector 2, the convergence lens 3, the diffuser screen 4 and the light screen 5 are arranged on the same light axis; the output end of a computer 1 is connected with the signal input end of the digital color projector 2. The flow field display method is characterized in that the shape and the color of output patterns are controlled by the computer, color patterns are sent out by the digital color projector and are converged on the diffuser screen through the convergence lens, and corresponding color patterns are formed on the diffuser screen so that the diffuser screen becomes into a color light source; the light screen covered on the diffuser screen filters residual light around the color patterns.
Description
Technical field
The present invention relates to be used for the two-dimentional color schlieren system that the flow field shows, be specifically related to light-source system wherein, and utilize this system to carry out the method that the flow field shows.
Background technology
When flow field that light changes by refractive index on any direction vertical with its direction of propagation deviation can take place, stration technique utilizes this principle stream field to observe exactly.Traditional one dimension stration technique can only observe flow field variations in refractive index in one direction, and can only show black white image, and this does not make full use of the potentiality of stration technique, nor can truly comprehensively reflect the actual physical phenomenon that takes place in the flow field.Utilize the three primary colors principle from the two-dimentional colour schlieren technology that eighties of last century the seventies occurs, light source done circularize colour, wherein red green blue tricolor respectively accounts for 1/3rd annulus, so just can cooperate the annular edge of a knife, utilize different colors to represent the refractive index gradient on the different directions in the flow field, and represent the refractive index gradient size with the power of light.
The two dimension color schlieren system shows that in the flow field field has many advantages with respect to traditional one dimension schlieren, comprising: can show the distribution of two-dimensional flow field refractive index gradient in all directions; In the flow field showed, solid model was black, and aerodynamic interference is colored, is convenient to like this boundary condition and flow field are surveyed and analyzed; Human eye is to the sensitivity height of the sensitivity comparison brightness variation of the variation of color, and cromogram is easy to identification; And the sensitive volume of colour schlieren is also greater than corresponding black and white schlieren system.But the still one dimension schlieren of present widespread use in research and production, this is because existing two-dimensional colour schlieren fabrication techniques and debugging are all very complicated, the particularly wherein making of light-source system, be to use the suitable white light chromatic color filter of colour temperature at present and obtain, chromatic color filter will be made into shape color graphics suitable, multiple color lump combination by dyeing gelatin or reversible film, manufacturing process is loaded down with trivial details, and color, shape are difficult to regulate and are difficult to guarantee precision.
Summary of the invention
Technical matters: the objective of the invention is to, the two-dimentional colour schlieren light-source system method for making that discards tradition, make full use of current advanced person's electronic technology, design and produce the employed digital two-dimentional colour schlieren light source of a kind of two-dimentional color schlieren system, and the flow field display packing of utilizing this light source to finish, make light source superior in quality, be convenient to regulate, use flexibly.
Technical scheme: purpose of the present invention realizes in the following manner:
Digital two-dimentional colour schlieren light source of the present invention, it is characterized in that this light source is by computing machine, digital color projecting apparatus, convergent lens, diffuser screen, shadow shield, optical bench, light tool guide rail is formed, wherein, diffuser screen, shadow shield abuts against together, at digital color projecting apparatus, convergent lens and the diffuser screen that lumps together, the below of shadow shield is respectively equipped with an optical bench, these three optical benchs flexibly connect respectively and are arranged on the same smooth tool guide rail digital color projecting apparatus, convergent lens, diffuser screen, the optical axis center of shadow shield is arranged on same the optical axis; The output terminal of computing machine and the signal input part of digital color projecting apparatus join.Digital color projecting apparatus sends colorama according to the figure signal of exporting and projects on the diffuser screen from computing machine.
Shadow shield is the material of non-light transmittance, cover on the uneven surface of diffuser screen, coverage mode can be that clamping, absorption, card are inserted, and the optical transmission window that adapts with the multicolour pattern shape is arranged on the shadow shield, the size of window is provided with the printing opacity aperture to be slightly less than the size of multicolour pattern in the middle of shadow shield.Diffuser screen is the frosted glass of roughness 4-10 μ m.The diameter of convergent lens is more than 4 times of color graphics yardstick of projector institute projection.
The flow field display packing of digital two-dimentional colour schlieren light source is: draw suitable color graphics by graphical compiler in computing machine, shape color by the computer control output pattern, send multicolour pattern by digital color projecting apparatus, converge on the diffuser screen through convergent lens, on diffuser screen, form corresponding multicolour pattern, make diffuser screen become a color light source; Cover the shadow shield elimination multicolour pattern surplus light on every side on the diffuser screen; Regulate light path, diffuser screen is positioned on the focal plane of concave mirror, diffuser screen makes the colorama that scatters by diffuser screen just become directional light through the concave mirror reflection between projector and concave mirror, and this concave mirror is called collimating mirror; This bundle directional light project not only reflection on the another side concave mirror then but also assemble become with diffuser screen on the identical color graphics of multicolour pattern that sends, this concave mirror is called the schlieren mirror, have identical parameter with collimating mirror, the optical axis of schlieren mirror and collimating mirror and the angle of directional light should be identical; The zone that directional light passes through between collimating mirror and the schlieren mirror is called experimental section; The position of assembling at directional light is provided with the annular edge of a knife, and this edge of a knife is shaped as diameter and the identical circular window of shadow shield window external diameter; At the annular edge of a knife rear convex lens and image display part are set, image display part can be white display screen, camera or video camera etc., and the position of image display part and convex lens must be regulated according to the position that flow field disturbance in the experimental section takes place and make this position blur-free imaging; Structure of flow field just can be presented on the image display part clearly when disturbance takes place the flow field in the experimental section like this.
Beneficial effect: key of the present invention is directly to have replaced white light in the prior art to add the structure of color filter with a digital color light source, this digital light is by computer control, the three primary colors annulus of acquiescence, the also color graphics of exportable other any required forms and color both can have been exported separately, compared to existing technology, the present invention has not only save loaded down with trivial details color filter manufacturing process, and improved the schlieren quality, can also make the user that the special requirement of basis oneself is very easily debugged and used.The flow field display packing of utilizing this light source to finish makes light source superior in quality, is convenient to regulate, and uses flexibly.
Description of drawings
Fig. 1 is a kind of example structure synoptic diagram of digital two-dimentional colour schlieren light-source system of the present invention.Computing machine 1 is wherein arranged, digital color projecting apparatus 2, convergent lens 3, diffuser screen 4, shadow shield 5, optical bench 6, light tool guide rail 7.
Fig. 2 is the colorful digital light source three primary colors annulus output pattern synoptic diagram of acquiescence.
Fig. 3 is the example structure synoptic diagram of the shadow shield that adapts with the three primary colors annulus.Wherein window 8, central small hole 9, and dash area is a zone of opacity among the figure.
Fig. 4 is a supersonic wind tunnel flow field situation of utilizing the present invention shown.
Fig. 5 is a helium bubbles flow field situation of utilizing the present invention shown.
Fig. 6 is square four color colored pattern synoptic diagram.Wherein 10 is red, and 11 is yellow, and 12 is green, and 13 is blue.
Fig. 7 is two-dimentional color schlieren system single unit system synoptic diagram.Digital light system 14 is wherein arranged, collimating mirror 15, experimental section 16, schlieren mirror 17, the annular edge of a knife 18, convex lens 19, image display part 20.
Embodiment
Be further described below by embodiment and accompanying drawing thereof.
The digital color projecting apparatus that is adopted among the present invention, convergent lens, diffuser screen, shadow shield place on the platform by optical bench, are arranged in order, keep each other same optical axis on the light path of digital light source; Should guarantee being connected between optical bench itself, optical bench and the platform at least one place or more many places adopt movable connection method commonly used in the physical construction so that adjust the height of each parts and position each other and direction; As long as operation is convenient to be connected with projector and is convenient to the placement location of computing machine; Color projecting apparatus should adopt resolution more than 800 * 600, and chromaticity will guarantee the color graphics of projection above-mentioned requirements in the type more than 16; The type of computing machine does not have specific (special) requirements, only need the energy display resolution more than 800 * 600, chromaticity gets final product at the figure more than 16, graphical compiler in the computing machine is to be made of the professional drawing software of being installed in the main frame, for example Photoshop, Autocad etc. are as long as can draw the color graphics of above-mentioned requirements; The color graphics that three primary colors annulus commonly used is set to give tacit consent in can prior art, and other figure is drawn according to actual needs.The bore of convergent lens should adapt with the projecting lens in the projector, for reducing effect of dispersion, the diameter of convergent lens should be at more than 4 times of color graphics yardstick, and placement location is optionally regulated, as long as the color graphics of projector institute projection can be converged on the diffuser screen; Diffuser screen should adopt scattering power good and self do not absorb material with reflect visible light as far as possible, and roughness is that the frosted glass of 4-10 μ m can be used as a suitable selection; Shadow shield is the material of non-light transmittance, cover on the uneven surface of diffuser screen, coverage mode can be that clamping, absorption, card are inserted etc., the optical transmission window that adapts with the multicolour pattern shape is arranged on the shadow shield, the size of window is of a size of suitablely to be slightly less than multicolour pattern, does not leak to guarantee the surplus light around the elimination multicolour pattern.The center of shadow shield can also be provided with the printing opacity aperture, can utilize like this surplus light that sees through on this aperture as a setting light, utilize the profile in this bright flow field of a spot of surplus illumination, then can make flow field structure be easier to observe, so that show flow field state better.During concrete the use, can utilize projector and convergent lens that this color graphics is converged on the diffuser screen, on diffuser screen, form corresponding multicolour pattern easily by the shape and the color of computer control output pattern; When graphic change, only need shadow shield and the schlieren edge of a knife be adjusted accordingly and get final product.
Accompanying drawing has provided specific embodiment, but the present invention is not limited to this.In digital two-dimentional colour schlieren light-source system embodiment shown in Figure 1, optical bench adopts height and the adjustable two-dimentional accurate thread adjusting bracket of direction, adopt the connected mode of slide block between optical bench and the guide rail, so that adjust the height of each parts and position each other and direction.Guide rail is placed on the platform again.The color projecting apparatus model is PHILIPS LC-3132, and its Data Input Interface is received on the data output interface of computing machine; Computer configuration is P4,1.8G, 256 MB of memory, TNT2 video card, graphical compiler in the computing machine is to be made of Photoshop mapping software of being installed in the computing machine and TNT2 video card, and the figure that red green blue tricolor annulus commonly used is set to give tacit consent in the prior art, external diameter 16mm, internal diameter 8mm.The convergent lens parameter is focal length 120mm, diameter 120mm.Diffuser screen is the frosted glass of roughness 4-10 μ m, thickness 2mm, and the periphery of diffuser screen is provided with the draw-in groove of clamping shadow shield; Shadow shield is a black photo paper, be inserted in the draw-in groove of diffuser screen periphery, (the coarse one side of diffuser screen can be towards also can be back to convergent lens to make it to be close to the coarse one side of diffuser screen, but shadow shield must be close to the coarse one side of diffuser screen), shadow shield is concentric with the three primary colors annulus that is focused on the diffuser screen, the optical transmission window of shadow shield and three primary colors annulus adapt, external diameter 14.5mm, internal diameter 10.5mm, and the printing opacity aperture of diameter 1.0mm is arranged at axle center place.
Use the colorful digital light source three primary colors annulus output pattern of acquiescence that color schlieren system is tested.Adopt supersonic wind tunnel and helium bubbles as interference source respectively.Experimental result shows that this digital two-dimentional colour schlieren origin system is easy to use, superior in quality, can clearly demonstrate the change of refractive in the flow field.In addition, can also use reddish yellow primary colors annulus or pattern or other patterns shown in Figure 6 color schlieren system to be tested as the output pattern.
Claims (5)
1, a kind of digital two-dimentional colour schlieren light source, it is characterized in that this light source is by computing machine (1), digital color projecting apparatus (2), convergent lens (3), diffuser screen (4), shadow shield (5), optical bench (6), light tool guide rail (7) is formed, wherein, diffuser screen (4), shadow shield (5) abuts against together, in digital color projecting apparatus (2), convergent lens (3) and the diffuser screen (4) that lumps together, the below of shadow shield (5) is respectively equipped with an optical bench (6), these three optical benchs (6) flexibly connect respectively and are arranged on the same smooth tool guide rail (7) digital color projecting apparatus (2), convergent lens (3), diffuser screen (4), the optical axis center of shadow shield (5) is arranged on same the optical axis; The signal input part of the output terminal of computing machine (1) and digital color projecting apparatus (2) joins; Digital color projecting apparatus (2) sends colorama according to the figure signal of exporting and projects on the diffuser screen (4) from computing machine (1).
2, digital two-dimentional colour schlieren light source according to claim 1, it is characterized in that shadow shield (5) is the material of non-light transmittance, cover on the uneven surface of diffuser screen (4), coverage mode can be that clamping, absorption, card are inserted, the optical transmission window (8) that adapts with the multicolour pattern shape is arranged on the shadow shield (5), the undersized of window (8) is provided with printing opacity aperture (9) in the size of multicolour pattern in the middle of shadow shield (5).
3, digital two-dimentional colour schlieren light source according to claim 1 and 2 is characterized in that described diffuser screen (4) is the frosted glass of roughness 4-10 μ m.
4, digital two-dimentional colour schlieren light source according to claim 1 and 2, the diameter that it is characterized in that described convergent lens (3) is more than 4 times of color graphics yardstick of projector institute projection.
5, a kind of flow field display packing that is used for digital two-dimentional colour schlieren light source, it is characterized in that using digital two-dimentional colour schlieren light source as claimed in claim 1, shape color by the computer control output pattern, send multicolour pattern by digital color projecting apparatus (2), converge on the diffuser screen (4) through convergent lens (3), on diffuser screen, form corresponding multicolour pattern, make diffuser screen (4) become a color light source; Cover shadow shield (5) the elimination multicolour pattern surplus light on every side on the diffuser screen (4); Regulate light path, diffuser screen is positioned on the focal plane of concave mirror, diffuser screen makes the colorama that scatters by diffuser screen through concave mirror reflection just becoming directional light between projector and concave mirror, and the optical axis of schlieren mirror and collimating mirror is identical with the angle of directional light; The zone that directional light passes through between collimating mirror and the schlieren mirror is called experimental section; The position of assembling at directional light is provided with the annular edge of a knife, and this edge of a knife is shaped as diameter and the identical circular window of shadow shield window external diameter; At the annular edge of a knife rear convex lens and image display part are set, structure of flow field just can be presented on the image display part clearly when disturbance takes place the flow field in the experimental section like this.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310106553 CN1225668C (en) | 2003-12-08 | 2003-12-08 | Digital two dimensional color schlieren light source and flow field display method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200310106553 CN1225668C (en) | 2003-12-08 | 2003-12-08 | Digital two dimensional color schlieren light source and flow field display method |
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| CN1547057A CN1547057A (en) | 2004-11-17 |
| CN1225668C true CN1225668C (en) | 2005-11-02 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672754B (en) * | 2009-10-15 | 2011-05-04 | 大连理工大学 | Laser processing gas-melt ratio detection device and method |
| CN101846812A (en) * | 2010-04-29 | 2010-09-29 | 中国科学技术大学 | Schlieren quasi-monochromatic light source device |
| CN104931224B (en) * | 2015-06-16 | 2017-06-16 | 哈尔滨工业大学 | A kind of device and method for observing different vacuum environment downstream flow field structures |
| CN108593088B (en) * | 2018-04-25 | 2020-09-08 | 重庆医科大学 | Focusing schlieren system for representing spherical focusing ultrasonic field |
| CN109283691B (en) * | 2018-10-30 | 2021-03-19 | 安徽工程大学 | Optical path transformation-based light field reconstruction three-dimensional display method and system |
| CN112618049B (en) * | 2020-12-14 | 2022-03-04 | 北京锐视康科技发展有限公司 | Medical imaging equipment with laser lamp is adjusted and is fixed a position |
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