CN105866970A - Reflective type high-speed camera shooting schlieren system applied to constant volume combustion bomb and capable of correcting chromatic aberration - Google Patents
Reflective type high-speed camera shooting schlieren system applied to constant volume combustion bomb and capable of correcting chromatic aberration Download PDFInfo
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- CN105866970A CN105866970A CN201610362854.3A CN201610362854A CN105866970A CN 105866970 A CN105866970 A CN 105866970A CN 201610362854 A CN201610362854 A CN 201610362854A CN 105866970 A CN105866970 A CN 105866970A
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- lens
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- constant volume
- condenser lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/50—Optics for phase object visualisation
- G02B27/54—Schlieren-optical systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a reflective type high-speed camera shooting schlieren system applied to a constant volume combustion bomb and capable of correcting chromatic aberration. The system comprises a light source, an optical fiber, a condenser lens group, a slit device, a first reflecting mirror, a collimating mirror, the constant volume combustion bomb, a schlieren mirror, a second reflecting mirror, a knife edge and a high-speed video camera which are arranged along an optical path sequentially, wherein a light input end of the optical fiber is connected with the light source; a light output end of the optical fiber is connected with the condenser lens group; a focal point of the condenser lens group and a focal point of the collimating mirror reflected by the first reflecting mirror coincide in the position of the slit device; the knife edge is located at a focal point of the schlieren mirror reflected by the second reflecting mirror. According to the system, the conventional condenser lens is improved by means of the condenser lens group, and the chromatic aberration produced by polychromatic light after passing through the lenses is corrected, so that a picture of real spherical flame propagation in the constant volume combustion bomb can be acquired more accurately.
Description
Technical field
The present invention relates to reflective schlieren system, reflective in particular to a kind of rectifiable aberration
Constant volume combustion bomb high-speed camera schlieren system.
Background technology
Constant volume combustion bomb is that simulated engine inside cylinder piston is close to atdc combustion process
Experimental provision, when high-speed schlieren system utilizes fuel combustion, in constant volume combustion bomb, fluid density is different
Thus the light passed through is produced different refraction effects, the directional light passed through is through one end glass
Window reflects in constant volume combustion bomb and finally makes high-speed camera through other end glass window
Catch the process that the ball flame in constant volume combustion bomb is propagated.
Conventional reflective constant volume combustion bomb high-speed camera schlieren system use halogen tungsten lamp or
Xenon lamp is as light source, and power consumption is big, quantity of heat production is big, radiating treatment take pains light decay, make
The effect de-stabilising effect experimental precision of the light that must export, the high heat simultaneously produced the most easily makes
Condenser lens below deforms upon and affects experimental precision.Additionally, due to the light in laboratory
Source is all polychromatic light, optically focused in traditional reflective constant volume combustion bomb high-speed camera schlieren system
Mirror all uses the convex lens of sphere, polychromatic light through convex lens reflect after due to shades of colour
The refractive index of light is different thus can produce aberration phenomenon so that the outmost turns of light can be coloured
Aperture, needs when the laminar burning velocity of the ball flame studied in constant volume bullet to measure final throwing
Penetrate the radius of ball flame image in high-speed camera, if producing aberration phenomenon during refraction,
Last high-speed camera will be with constant volume by the ball flame radius that schlieren system photographs
The radius deviation of the ball flame of the true experiment in firebomb, thus the ball finally calculated
The parameter of shape propagating flame also can be with the parameter deviation of real spherical propagating flame.
Summary of the invention
Present invention aim to provide the reflective constant volume combustion bomb of a kind of rectifiable aberration
High-speed camera schlieren system, this reflective schlieren system by the condenser lens in traditional schlieren by
Single convex lens originally be improved to by two convex lenss and concave lens combine poly-
Light microscopic group, it is existing at the aberration produced when lens reflect that this condenser lens group can correct polychromatic light
As such that it is able in obtaining constant volume combustion bomb more accurately, real ball flame propagates photo.
For achieving the above object, the reflective constant volume burning of the rectifiable aberration designed by the present invention
Play high-speed camera schlieren system, including the light source set gradually along light path, optical fiber, condenser lens group,
Slit arrangement, the first reflecting mirror, collimating mirror, constant volume combustion bomb, schlieren mirror, the second reflecting mirror,
The edge of a knife and high-speed camera, the light input end of described optical fiber is connected with light source, the light of described optical fiber
Outfan is connected with condenser lens group, and the focus of described condenser lens group and collimating mirror are through the first reflection
Focus after mirror reflection overlaps at slit arrangement, slit is placed in the focus of condenser lens group with accurate
The overlapping position of straight mirror focus after the first reflecting mirror reflection is for regulation projection of being more convenient for
Light in constant volume bullet number, i.e. be easy to regulate light source size, the described edge of a knife is positioned at stricture of vagina
Shadow mirror focal point after the second reflecting mirror reflection, is arranged so as to be for the ease of regulation projection
The number of the light in high-speed camera.
Further, described condenser lens group by the first convex lens set gradually along light path, first
Concavees lens and the second convex lens composition, described first convex lens, the first concavees lens, the second convex lens
Distance between mirror three is adjustable, is so adapted to not by the distance between three lens of regulation
Same light source, is conducive to having corrected polychromatic light at the aberration produced after lens such that it is able to
In obtaining constant volume combustion bomb more accurately, real ball flame propagates photo.
Further, described condenser lens group is arranged in condenser lens group lens barrel, described condenser lens group
Lens barrel includes the first convex lens lens barrel, the first concavees lens lens barrel and the second convex lens lens barrel；Described
One end inner ring of the first convex lens lens barrel is provided with for being fitted together to the first annular recessed of the first convex lens
Groove, described first concavees lens lens barrel is provided with the inner chamber for fixing the first concavees lens, institute vertically
One end inner ring stating the second convex lens lens barrel is provided with the second annular for being fitted together to the second convex lens
Groove；One end of described first concavees lens lens barrel has first annular recessed with the first convex lens lens barrel
One end of groove is threaded connection, the other end of described first concavees lens lens barrel and the second convex lens
Lens barrel has one end of the second annular groove and is threaded connection.So, each lens barrel passes through spiral shell
Stricture of vagina connects, and is corrected the aberration phenomenon of different situations by the degree of precession between lens barrel, it is to avoid
In regulation lens process, hands directly contacts minute surface and makes dirty minute surface, simultaneously between regulation minute surface
Distance can also be more stable.It is essential that in condenser lens group, when convex lens lens barrel revolves completely
When entering in concavees lens lens barrel, convex lens now and the distance of concavees lens are equal to 0.
Further, described first annular groove, the second annular groove and interior intracavity are equipped with ring
Shape spacing collar.So, desirably prevent lens by lens barrel scratching or crushing, and be easy to lens
Cleaning and replacing.
Yet further, described slit arrangement is aperture adjustable narrow annular channel device, so exists
Debugging schlieren system slit aperture in season is 0, can more accurately and more easily determine condenser lens group
Focus, experiment time can by regulation slit aperture size determine required light source
Size.
Further, described light source is LED-light source, consume energy low, be not easy heating, with
Using light transmission fiber between condenser lens group, optical fiber is flexible so that light source is convenient the most mobile,
Light source is kept apart with condenser lens group, it is to avoid the heat that light source sends makes the battery of lens to deform
Thus affect the effect of experiment.
Compared with prior art, present invention have the advantage that
One, the present invention uses condenser lens group to be improved existing condenser lens, corrects
Polychromatic light is at the aberration produced after condenser lens lens such that it is able to it is fixed to obtain more accurately
In holding firebomb, real ball flame propagates the radius of spherical propagating flame in photo.
Its two, the present invention is mounted with a scalable between condenser lens group and first reflecting mirror
The slit arrangement of pore size, so just can be easier to, more accurately when debugging schlieren system
Determine the focal position of the light after the refraction of condenser lens group, the most also can pass through adjustment aperture
Size regulate the size of light source easily.
Its three, the light source of the present invention uses the LED-light source that power consumption is low, be difficult to heating, with poly-
Using light transmission fiber between light microscopic group, optical fiber is flexible so that light source is convenient the most mobile,
Light source is kept apart with condenser lens group, it is to avoid the heat that light source sends makes the condenser lens group to become
Shape so that condenser lens group is corrected aberration ability and died down, thus affects the effect of experiment.
Accompanying drawing explanation
Fig. 1 is the reflective constant volume combustion bomb high-speed camera schlieren system of a kind of rectifiable aberration
Structural representation；
Fig. 2 is the structural representation of condenser lens group in Fig. 1；
Fig. 3 is the structural representation of condenser lens group lens barrel in Fig. 1；
Fig. 4 is the structural representation of slit arrangement in Fig. 1；
Wherein: light source 1, optical fiber 2, condenser lens group 3, slit arrangement the 4, first reflecting mirror 5,
Collimating mirror 6, constant volume combustion bomb 7, schlieren mirror the 8, second reflecting mirror 9, the edge of a knife 10, at a high speed
Video camera the 11, first convex lens the 12.1, second convex lens the 12.2, first concavees lens 13.1,
Condenser lens group lens barrel the 14, first convex lens lens barrel the 14.1, first concavees lens lens barrel 14.2,
Two convex lens lens barrels 14.3, first annular groove the 15.1, second annular groove 15.2, inner chamber
16, annular stop circle 17.
Detailed description of the invention
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
The reflective constant volume combustion bomb high-speed camera schlieren system of the rectifiable aberration shown in figure,
Including the light source 1 set gradually along light path, optical fiber 2, condenser lens group 3, slit arrangement 4,
One reflecting mirror 5, collimating mirror 6, constant volume combustion bomb 7, schlieren mirror the 8, second reflecting mirror 9, cutter
Mouth 10 and high-speed camera 11；Light source 1 is LED-light source, the light input end of optical fiber 2 and light
Source 1 connects, and the light output end of optical fiber 2 is connected with condenser lens group 3, the focus of condenser lens group 3
Overlap at slit arrangement 4 with the collimating mirror 6 focus after the first reflecting mirror 5 reflection, this
Sample can regulate light source size by the pore size of regulation slit arrangement 4, also can be in debugging
During schlieren system, energy is more convenient, determine the focus of condenser lens group more accurately, and the edge of a knife 10 is positioned at
The schlieren mirror 8 focal point after the second reflecting mirror 9 reflection, so can be by the regulation edge of a knife
The aperture of 10 determines the size of the image finally projected in high-speed camera 11.
In technique scheme, condenser lens group 3 is by the first convex lens set gradually along light path
12.1, the first concavees lens 13.1 and the second convex lens 12.2 form, the first convex lens 12.1,
Distance between first concavees lens the 13.1, second convex lens 12.2 three is adjustable, so passes through
The distance regulating first convex lens the 12.1, first concavees lens 13.1 and the second convex lens 12.2 is come
Correct different light source to emit beam the aberration produced.
In technique scheme, condenser lens group 3 is arranged in condenser lens group lens barrel 14, optically focused
Mirror group lens barrel 14 includes first convex lens lens barrel the 14.1, first concavees lens lens barrel 14.2 and second
Convex lens lens barrel 14.3；One end inner ring of the first convex lens lens barrel 14.1 is provided with for being fitted together to
The first annular groove 15.1 of one convex lens 12.1, the first concavees lens lens barrel 14.2 sets vertically
There are the inner chamber 16 for fixing the first concavees lens 13.1, one end of the second convex lens lens barrel 14.3
Inner ring is provided with the second annular groove 15.2 for being fitted together to the second convex lens 12.2；First is recessed
One end of mirror lens barrel 14.2 and the first convex lens lens barrel 14.1 have first annular groove 15.1
One end is threaded connection, the other end of the first concavees lens lens barrel 14.2 and the second convex lens mirror
One end that cylinder 14.3 has the second annular groove 15.2 is threaded connection.Each lens are pacified
Being contained in the most corresponding lens barrel, each lens barrel is threaded connection, by revolving between lens barrel
The degree entered to be to correct the aberration phenomenon of different situations, it is to avoid in regulation lens process, hands is straight
Contact minute surface is made dirty minute surface, and the distance between regulation minute surface can also be more stable simultaneously.Important
, in condenser lens group, when convex lens lens barrel is fully screwed in concavees lens lens barrel, now
Convex lens and the distance of concavees lens equal to 0.
In technique scheme, first annular groove the 15.1, second annular groove 15.2 and interior
It is equipped with annular stop circle 17 in chamber 16, desirably prevents by annular stop circle 17 is fixing
Lens are scratched or crushed, and are easy to cleaning and the replacing of lens.
In technique scheme, slit arrangement 4 is aperture adjustable narrow annular channel device, determines
During the focus of condenser lens group 3, the aperture of slit arrangement 4 is adjusted to 0, when projecting slit dress
Put on 4 be a bright hot spot time, the position at slit arrangement 4 place is condenser lens group 3
Focal plane.
The work process of the present invention: first, the light that light source 1 sends is the most poly-through optical fiber 2 transmission
Light microscopic group 3, the distance between regulation each lens of condenser lens group 3 so that be finally incident upon narrow
On seam device 4, the outmost turns at light does not has coloured aperture, then is adjusted in the aperture of slit arrangement 4
It is 0, the distance of regulation slit arrangement 4 and condenser lens group 3 so that at slit arrangement 4 be
One bright hot spot, the now focal plane that face is condenser lens group 3 at slit arrangement 4 place,
At slit arrangement 4 is point source；Then, point source is sent by the focal point of condenser lens group 3
After, after first reflecting mirror 5 reflection, project collimating mirror 6, reflect through collimating mirror 6
After light formed the uniform directional light of colour mixture project in constant volume combustion bomb 7；Then, constant volume combustion
Burning tested district burning in bullet 7, form ball flame, flow disturbance, refractive index changes,
Directional light arrives schlieren mirror 8 through tested region, and the light after schlieren mirror 8 reflects passes through
By the edge of a knife 10, finally imaging on high-speed camera 11 after dihedral reflector 9 reflection.
The above, the only detailed description of the invention of the present invention, it is noted that any be familiar with basis
The technical staff in field in the technical scope that disclosed herein, the change that can readily occur in or
Replace, all should contain within protection scope of the present invention.
Claims (6)
1. a reflective constant volume combustion bomb high-speed camera schlieren system for rectifiable aberration, its
Be characterised by: the light source (1) that includes setting gradually along light path, optical fiber (2), condenser lens group (3),
Slit arrangement (4), the first reflecting mirror (5), collimating mirror (6), constant volume combustion bomb (7), stricture of vagina
Shadow mirror (8), the second reflecting mirror (9), the edge of a knife (10) and high-speed camera (11), described
The light input end of optical fiber (2) is connected with light source (1), the light output end of described optical fiber (2)
It is connected with condenser lens group (3), the focus of described condenser lens group (3) and collimating mirror (6) warp
Cross the focus after the first reflecting mirror (5) reflection to overlap at slit arrangement (4) place, the described edge of a knife
(10) the schlieren mirror (8) focal point after the second reflecting mirror (9) reflects it is positioned at.
The reflective constant volume combustion bomb of rectifiable aberration the most according to claim 1 is at a high speed
Shooting schlieren system, it is characterised in that: described condenser lens group (3) is set gradually by along light path
The first convex lens (12.1), the first concavees lens (13.1) and the second convex lens (12.2) group
Become, described first convex lens (12.1), the first concavees lens (13.1), the second convex lens (12.2)
Distance between three is adjustable.
The reflective constant volume combustion bomb of rectifiable aberration the most according to claim 2 is at a high speed
Shooting schlieren system, it is characterised in that: described condenser lens group (3) is arranged on condenser lens group mirror
Cylinder (14) in, described condenser lens group lens barrel (14) include the first convex lens lens barrel (14.1),
First concavees lens lens barrel (14.2) and the second convex lens lens barrel (14.3)；
One end inner ring of described first convex lens lens barrel (14.1) is provided with for being fitted together to the first convex lens
The first annular groove (15.1) of mirror (12.1), described first concavees lens lens barrel (14.2) edge
It is axially arranged with the inner chamber (16) for fixing the first concavees lens (13.1), described second convex lens
One end inner ring of mirror lens barrel (14.3) be provided with for be fitted together to the second convex lens (12.2) second
Annular groove (15.2)；
One end of described first concavees lens lens barrel (14.2) and the first convex lens lens barrel (14.1)
The one end with first annular groove (15.1) is threaded connection, described first concavees lens mirror
The other end and the second convex lens lens barrel (14.3) of cylinder (14.2) have the second annular groove (15.2)
One end be threaded connection.
The reflective constant volume combustion bomb of rectifiable aberration the most according to claim 3 is at a high speed
Shooting schlieren system, it is characterised in that: described first annular groove (15.1), the second annular
It is equipped with annular stop circle (17) in groove (15.2) and inner chamber (16).
5. according to the reflective constant volume of the rectifiable aberration according to any one of Claims 1 to 4
Firebomb high-speed camera schlieren system, it is characterised in that: described slit arrangement (4) is aperture
Adjustable narrow annular channel device.
6. according to the reflective constant volume of the rectifiable aberration according to any one of Claims 1 to 4
Firebomb high-speed camera schlieren system, it is characterised in that: described light source (1) is LED-light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610362854.3A CN105866970A (en) | 2016-05-27 | 2016-05-27 | Reflective type high-speed camera shooting schlieren system applied to constant volume combustion bomb and capable of correcting chromatic aberration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610362854.3A CN105866970A (en) | 2016-05-27 | 2016-05-27 | Reflective type high-speed camera shooting schlieren system applied to constant volume combustion bomb and capable of correcting chromatic aberration |
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| Publication Number | Publication Date |
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| CN105866970A true CN105866970A (en) | 2016-08-17 |
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|---|---|---|---|
| CN201610362854.3A Pending CN105866970A (en) | 2016-05-27 | 2016-05-27 | Reflective type high-speed camera shooting schlieren system applied to constant volume combustion bomb and capable of correcting chromatic aberration |
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| CN (1) | CN105866970A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107884194A (en) * | 2017-11-07 | 2018-04-06 | 西华大学 | A kind of big valve stroke measurement and knock-on test device and method |
| CN108732115A (en) * | 2018-05-18 | 2018-11-02 | 中国矿业大学(北京) | A kind of schlieren system for observing circular pipe flow field |
| CN109974893A (en) * | 2019-03-27 | 2019-07-05 | 东南大学 | A kind of graded index flame three-dimensional temperature field measurement method |
| CN110985256A (en) * | 2019-12-19 | 2020-04-10 | 哈尔滨工程大学 | Constant volume elastic reflector end cover and porous oil sprayer spraying test system applying same |
| CN111025663A (en) * | 2019-12-24 | 2020-04-17 | 哈尔滨工程大学 | LED array light source and porous spray test system applying same |
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| CN111025663A (en) * | 2019-12-24 | 2020-04-17 | 哈尔滨工程大学 | LED array light source and porous spray test system applying same |
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