CN210005208U - high-uniformity high-resolution schlieren optical system using aspheric surface - Google Patents
high-uniformity high-resolution schlieren optical system using aspheric surface Download PDFInfo
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- CN210005208U CN210005208U CN201920703040.0U CN201920703040U CN210005208U CN 210005208 U CN210005208 U CN 210005208U CN 201920703040 U CN201920703040 U CN 201920703040U CN 210005208 U CN210005208 U CN 210005208U
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Abstract
The utility model relates to an kind adopt aspheric high even high resolution schlieren optical system, solve the problem that current schlieren system homogeneity and resolution ratio are not high, this system includes light source system, observation window before sealed, collimation main reflector, schlieren system, schlieren main reflector, sealed back observation window and imaging system, schlieren system is including the sealed preceding schlieren lens cone, test chamber, sealed back schlieren lens cone that set gradually, observation window sets up the side at sealed preceding schlieren lens cone before sealed, sealed back observation window sets up the side at sealed back schlieren lens cone, collimation main reflector and schlieren main reflector all adopt the aspheric surface speculum, imaging system is long burnt imaging system, light that light source system sent passes through observation window before sealed and incides collimation main reflector, light behind the collimation main reflector gets into test chamber through sealed preceding schlieren and incides schlieren main reflector, schlieren main reflector reflects light, incides imaging system behind the observation window after sealed.
Description
Technical Field
The utility model relates to a schlieren optical system, concretely relates to adopt aspheric high even high resolution schlieren optical system.
Background
In a schlieren imaging system, uniformity and resolution are important indicators for evaluating schlieren image quality. In the development process of the traditional schlieren system, the two indexes are generally grasped by the past experience, or a simple experiment needs to be built to verify the design result. For a 1-meter-level schlieren system, the past experience is limited, and the cost of a simple experiment method is huge, so that the traditional method is not suitable for the 1-meter-level schlieren system, and how to ensure that the uniformity and the resolution index of the 1-meter-level schlieren system meet the design requirements puts higher requirements on the design work of the whole system.
in the existing schlieren imaging system generally comprises three pairs of conjugate relations, wherein the pair of conjugate relations image a light source surface on a slit, the second pair of conjugate relations image the slit on a knife edge, and the third pair of conjugate relations image a test area object surface on a camera receiving screen, wherein the pair of conjugate relations are used for obtaining a regular and uniform secondary light source, the second pair of conjugate relations mainly form a slit image at the knife edge, and the third pair of conjugate relations are mainly used for obtaining a schlieren image of the test area.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that current schlieren system homogeneity and resolution ratio are not high, provide kinds of high even high resolution schlieren optical system who adopts the aspheric surface.
The technical scheme of the utility model is that:
high-uniformity high-resolution schlieren optical system adopting aspheric surface comprises a light source system, a sealed front observation window, a collimation main reflector, a schlieren system, a schlieren main reflector, a sealed rear observation window and an imaging system, wherein the schlieren system comprises a sealed front schlieren lens barrel, a test chamber and a sealed rear schlieren lens barrel which are sequentially arranged, the sealed front observation window is arranged on the side surface of the sealed front schlieren lens barrel, the sealed rear observation window is arranged on the side surface of the sealed rear schlieren lens barrel, the collimation main reflector and the schlieren main reflector both adopt aspheric surface reflectors, the imaging system is a long-focus imaging system, light emitted by the light source system penetrates through the sealed front observation window to be incident to the collimation main reflector, the light after being collimated by the collimation main reflector enters the test chamber through the sealed front schlieren lens barrel, the schlieren main reflector reflects the light, and the light is incident to the imaging system after passing through the sealed rear observation window.
, the collimating primary mirror and the schlieren primary mirror are coaxial parabolic primary mirrors and are symmetrically positioned about the chamber at an off-axis angle of 1.6 °.
, the collimating primary mirror and the schlieren primary mirror reflective surface are provided with a protective film.
, the sealed rear observation window is a small-sized sealed rear observation window with the caliber smaller than the effective flow field display range 1/10, and the sealed front observation window is a small-sized sealed front observation window with the caliber smaller than the effective flow field display range 1/10.
, the sealed front schlieren tube and the test chamber are connected by a sealed bellows, and the test chamber and the sealed rear schlieren tube are connected by a sealed bellows.
, the light source system comprises an ultra-high brightness LED lamp, a condenser lens group, a slit, a plane reflector.
, the optical axis of the condenser lens group, the center of the slit and the center of the th plane mirror are coaxially arranged.
, the slit is a square slit.
, the imaging system comprises a second plane mirror, a knife edge, a focusing lens group and a schlieren camera which are arranged in sequence, and a knife edge controller for controlling the knife edge.
, the sealed front schlieren tube and the sealed back schlieren tube are cylindrical structures.
Compared with the prior art, the utility model, following technological effect has:
1. the utility model discloses schlieren system adopts the design of aspheric surface speculum, and the aspheric surface speculum is kinds of off-axis parabolic designs, has avoided spherical reflector's aberration such as spherical aberration, has guaranteed the homogeneity of image, has greatly promoted schlieren system's homogeneity and resolution ratio.
2. The utility model discloses imaging system adopts long burnt imaging system, has guaranteed the resolution ratio of schlieren system. The resolution of the system is proportional to the aperture of the system and inversely proportional to the focal length of the system, and the tele system has higher resolution.
Drawings
FIG. 1 is a schematic view of an aspheric high-uniformity high-resolution schlieren optical system.
The reference signs are 1-ultrahigh brightness LED lamp, 2-condenser lens group, 3-slit, 4- th plane reflector, 5-sealed front observation window, 6-collimation primary reflector, 7-sealed front schlieren lens barrel, 8-test chamber, 9-sealed rear schlieren lens barrel, 10-schlieren primary reflector, 11-sealed rear observation window, 12-second plane reflector, 13-knife edge, 14-knife edge controller, 15-focusing lens group, 16-schlieren camera and 17-sealed corrugated pipe.
Detailed Description
The invention is described in further detail with reference to the figures and the embodiments.
As shown in fig. 1, the present invention provides kinds of high-uniformity high-resolution schlieren optical systems using aspheric surfaces, which includes a light source system, a front sealed observation window 5, a main collimating reflector 6, a schlieren system, a schlieren main reflector 10, a rear sealed observation window 11 and an imaging system.
The light source system comprises an ultra-high brightness LED lamp 1, a condenser lens group 2, a square slit 3 and an th plane reflector 4 which are sequentially arranged, wherein the ultra-high brightness LED lamp 1 has a large light flux value, the optical axis of the condenser lens group 2, the center of the square slit 3 and the center of the th plane reflector 4 are consistent, and the square slit is formed by four narrow square slits and a combined color filter formed by splicing four kinds of colored glass, namely red, yellow, green and blue.
The imaging system comprises a knife edge controller 14, a knife edge 13, a second plane reflector 12, a focusing lens group 15 and a schlieren camera 16, wherein the knife edge 13 is four narrow slits in a shape of a square, the knife edge controller 14 can respectively control the positions of the four narrow slits 3 in the shape of the square so that light rays can completely pass through the knife edge 13, the second plane reflector 12 keeps the optical axes of the focusing lens group 15 and the schlieren camera 16 in a -like mode, the schlieren camera 16 is located at the focal position of the focusing lens group 15, the light rays are reflected to the knife edge 13 by the second plane reflector 12 after passing through a sealed observation window 11, the knife edge controller 14 controls the positions of the four slits 3 in the shape of the square in the knife edge 13 so that the light rays enter the focusing lens group 15 through the knife edge 13, the focusing lens group 15 focuses the light rays onto the photosensitive surface of the schlieren camera 16, and the schlieren camera 16 images emergent light rays to obtain a schlieren image.
The schlieren system comprises a sealed front schlieren lens barrel 7, a test chamber 8 and a sealed rear schlieren lens barrel 9, the sealed front schlieren lens barrel 7 and the sealed rear schlieren lens barrel 9 are fixed at two ends of the test chamber 8, the test chamber 8 is placed in a high-speed wind tunnel, a collimation optical axis of a collimation main reflector 6 and a main shaft of the schlieren system are kept , the center of the schlieren main reflector 10 and the center of the collimation main reflector 6 are connected, the sealed front schlieren lens barrel 7 and the test chamber 8 are connected through an airtight corrugated pipe, the sealed front schlieren lens barrel 7 and the sealed rear schlieren lens barrel 9 can be welded at two sides of the test chamber 8, the test chamber 8 and the sealed rear schlieren lens barrel 9 are connected through the airtight corrugated pipe, the sealed front schlieren lens barrel 7 and the sealed rear schlieren lens barrel 9 can be cylindrical and are formed by welding stainless steel plates in a curling mode, emergent light of the collimation main reflector 6 is parallel light, and the parallel.
The sealed front observation window 5 is arranged on the side surface of the sealed front schlieren lens barrel 7, and the sealed rear observation window 11 is arranged on the side surface of the sealed rear schlieren lens barrel 9; the sealed front observation window 5 is a small-sized sealed front observation window 5, the caliber of which is smaller than the effective flow field display range 1/10, and the effective passing caliber of light rays is not blocked. The sealed observation window 11 is a small-sized sealed observation window 11, the caliber of which is smaller than the effective flow field display range 1/10, and light rays are not blocked to effectively pass through the caliber.
The collimating main reflector 6 and the schlieren main reflector 10 both adopt aspheric reflectors, so that the imaging uniformity of the schlieren system is ensured, and the aspheric reflectors are designed for off-axis paraboloids, so that the aberrations such as spherical aberration of the spherical reflectors are avoided, and the uniformity of images is ensured.
The focusing lens group 15 in the imaging system adopts a long-focus imaging system, so that the resolution of the schlieren system is ensured. The resolution of the system is proportional to the aperture of the system and inversely proportional to the focal length of the system, and the tele system has higher resolution.
The utility model discloses form the slit conjugate image in edge of a knife 13 department, just can promote the homogeneity of schlieren system, improve schlieren camera 16's schlieren image, just can promote the resolution ratio of schlieren system. By arranging the aspheric reflector, the imaging quality of the slit conjugate image formed at the knife edge 13 is improved, and the uniformity of a schlieren system is improved. By the arrangement of the long-focus focusing lens group 15, a schlieren image of the schlieren camera is improved, and the resolution of a schlieren system is improved.
The ultra-high brightness LED lamp 1 is characterized in that light rays emitted by the ultra-high brightness LED lamp 1 are condensed by the condenser lens group 2, the condensed light rays pass through the 'square' -shaped slit 3 and are filtered by four narrow slits in the 'square' -shaped slits, namely, four colored glass 'square' -shaped slits of red, yellow, green and blue, the filtered light rays are reflected by the planar reflector 4 to the small-size sealed front observation window 5, the light rays are incident to the collimation primary reflector 6 through the small-size sealed front observation window 5, the collimation primary reflector 6 collimates the light rays and reflects the light rays to the sealed front schlieren lens barrel 7, the light rays reach the test cabin 8 through the sealed front schlieren lens barrel 7, the test cabin 8 is placed in a high-speed wind tunnel, the light rays are incident to the schlieren primary reflector 10 through the sealed rear schlieren lens barrel 9 after high-speed sealing in the test cabin 8, the schlieren lens 10 reflects the light rays to the second planar reflector 12 after small-size sealing, the light rays are reflected to the wind tunnel 13, the knife edge controller 14 controls the 'square' -shaped slits in the knife edge 13, the four slit positions of the light rays reach the second planar reflector 12, and the camera 16, and the light rays are focused on the camera for imaging of the schlieren camera 8, and the camera.
The utility model discloses the system has adopted two symmetric distribution's heavy-calibre (1 meter level) aspheric surface speculum to regard as collimation light path and imaging system's optical element respectively, adopts long burnt imaging system design to realize the high resolution, adopts precision optics processing and optical design optimization simulation to guarantee the high illuminance homogeneity of system, this utility model successfully realized 1 meter level bore schlieren primary mirror asphericity, acquireed and obtained high homogeneity, high resolution schlieren figure, can supply the schlieren optical system design reference of bigger bore from now on and push away .
The utility model discloses before the system design, establish the simulation environment, do not place any object promptly in the experiment cabin, simulation schlieren camera 16 received image, because four kinds of colour lights of "mouth" font slit outgoing correspond slits of the edge of a knife respectively, it is through homogeneity on image plane after the edge of a knife cutting to have imitated every kind of colour light respectively in the schlieren system, the homogeneity of image plane has the osculation with each mirror shape of face in the system, consider main mirror shape machining error, the main mirror shape error that different operating mode main mirrors supported the lead to, plane reflection mirror shape error, the influence of the sealed observation window of schlieren section of thick bamboo of cominging in and going out of light beam, to schlieren system simulation, analysis image plane homogeneity, the result stack according to four kinds of colour lights again, obtain the homogeneity of schlieren system image.
The method comprises the steps of placing original images with different fringe widths on an object plane, setting a main schlieren reflector, a slit and a schlieren imaging system by CODE V software, giving a transfer function of the system from the object plane to the image plane and a contrast result of an output image at a required resolution by considering system comprehensive errors, designing parameters of each optical element in the schlieren system, setting parameters of a collimation main reflector and a schlieren main reflector in a CODE V pair, simulating the imaging quality of the schlieren main system, calculating the resolution, aberration and other parameters of the image, determining specific parameters of a focusing lens group in the imaging system according to the obtained image information, and obtaining images with high resolution and good uniformity.
The collimation main reflector and the schlieren main reflector are symmetrically arranged around the test chamber, the off-axis angle is 1.6 degrees, the collimation main reflector 6 and the schlieren main reflector 10 are coaxial paraboloid main reflectors, and the design parameters are as follows:
wavelength range: 435 nm-700 nm;
entrance pupil diameter: phi 1200 mm;
focal length: 12000 mm;
coefficient of linear expansion: 0 + -1.5X 10-7/deg.C;
the diameter phi 1250 mm;
the center thickness is 175 mm;
after the reflector is processed, a film layer with high reflection coefficient and a protective film are plated, the protective film is a durable SiO2 film layer, the oxidation of a high-reflection silver film is prevented, the high-reflection film layer is protected, the reflectivity of the film layer is over 90 percent, and the uniformity is more than 97 percent.
And (4) carrying out parameter setting on the system light path in CODE V software according to the parameters, and simulating the imaging quality of the system.
Claims (10)
1, aspheric high-uniformity high-resolution schlieren optical systems, which are characterized by comprising a light source system, a sealed front observation window (5), a collimation main reflector (6), a schlieren system, a schlieren main reflector (10), a sealed rear observation window (11) and an imaging system;
the schlieren system comprises a sealed front schlieren lens barrel (7), a test chamber (8) and a sealed rear schlieren lens barrel (9) which are arranged in sequence; the sealed front observation window (5) is arranged on the side surface of the sealed front schlieren lens cone (7), and the sealed rear observation window (11) is arranged on the side surface of the sealed rear schlieren lens cone (9);
the collimation main reflecting mirror (6) and the schlieren main reflecting mirror (10) both adopt aspheric reflecting mirrors;
the imaging system is a tele imaging system;
light that light source system sent passes through observation window (5) before sealed and incides collimation primary reflector (6), and the light after collimation primary reflector (6) gets into test chamber (8) through schlieren lens-barrel (7) before sealed, incides schlieren primary reflector (10) through sealed back schlieren lens-barrel (9) behind test chamber (8) air current, and schlieren primary reflector (10) reflect light, incides imaging system behind observation window (11) after sealed.
2. The optical system according to claim 1, wherein the optical system comprises: the collimation main reflector (6) and the schlieren main reflector (10) are coaxial paraboloid main reflectors and are symmetrically arranged relative to the test chamber (8), and the off-axis angle is 1.6 degrees.
3. The optical system of claim 2, wherein the optical system comprises: and protective films are arranged on the reflecting surfaces of the collimation main reflecting mirror (6) and the schlieren main reflecting mirror (10).
4. The optical system according to claim 3, wherein the optical system comprises: the front sealed observation window (5) is a small-size front sealed observation window, the caliber of the front sealed observation window is smaller than the effective flow field display range 1/10, and the rear sealed observation window (11) is a small-size rear sealed observation window, and the caliber of the rear sealed observation window is smaller than the effective flow field display range 1/10.
5. The optical system according to any of above, wherein the sealed front schlieren tube (7) and the test chamber (8) are connected by a sealed bellows (17), and the test chamber (8) and the sealed rear schlieren tube (9) are connected by a sealed bellows (17).
6. The optical system of claim 5, wherein the light source system comprises an ultra-high brightness LED lamp (1), a condenser lens group (2), a slit (3), and an th plane mirror (4) arranged in sequence.
7. The optical system of claim 6, wherein the optical axis of the condenser lens group (2), the center of the slit (3), and the center of the th plane mirror (4) are coaxially arranged.
8. The optical system according to claim 7, wherein the optical system comprises: the slit (3) is a square slit.
9. The optical system according to claim 8, wherein the optical system comprises: the imaging system comprises a second plane reflector (12), a knife edge (13), a focusing lens group (15), a schlieren camera (16) and a knife edge controller (14) for controlling the knife edge (13), wherein the second plane reflector, the knife edge (13), the focusing lens group and the schlieren camera are sequentially arranged.
10. The optical system according to claim 9, wherein the optical system comprises: the sealed front schlieren lens-barrel (7) and the sealed back schlieren lens-barrel (9) are cylindrical structures.
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| CN201920703040.0U CN210005208U (en) | 2019-05-15 | 2019-05-15 | high-uniformity high-resolution schlieren optical system using aspheric surface |
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| CN201920703040.0U CN210005208U (en) | 2019-05-15 | 2019-05-15 | high-uniformity high-resolution schlieren optical system using aspheric surface |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207928A (en) * | 2019-05-15 | 2019-09-06 | 中国科学院西安光学精密机械研究所 | It is a kind of using the uniform high-resolution schlieren optical system of aspherical height |
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2019
- 2019-05-15 CN CN201920703040.0U patent/CN210005208U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207928A (en) * | 2019-05-15 | 2019-09-06 | 中国科学院西安光学精密机械研究所 | It is a kind of using the uniform high-resolution schlieren optical system of aspherical height |
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