CN105425528B - Compensation filtering apparatus in multisequencing laser shadowgraph - Google Patents
Compensation filtering apparatus in multisequencing laser shadowgraph Download PDFInfo
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- CN105425528B CN105425528B CN201510801314.6A CN201510801314A CN105425528B CN 105425528 B CN105425528 B CN 105425528B CN 201510801314 A CN201510801314 A CN 201510801314A CN 105425528 B CN105425528 B CN 105425528B
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- image
- objective lens
- forming objective
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B39/00—High-speed photography
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B11/00—Filters or other obturators specially adapted for photographic purposes
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Blocking Light For Cameras (AREA)
- Microscoopes, Condenser (AREA)
Abstract
The invention belongs to ultra-high speed transient imaging field, the compensation filtering apparatus being related in a kind of multisequencing laser shadowgraph, described device includes the density wedge filter, image-forming objective lens and optical filtering of drop-over successively；Density wedge filter clear aperture is 25mm, material BK7, in 532nm optical densities variation range 0.08~2.0；The focal length of image-forming objective lens is 118mm, clear aperture 25mm；Optical filtering clear aperture is 25.4mm, centre wavelength 532nm, bandwidth 10nm, thickness 1.5mm, normal incidence when transmissivity be 75%, optical filtering is perpendicular to 10 °~30 ° slant settings of optical axis direction.Optical filtering of the present invention is positioned over after image-forming objective lens, eliminates the veiling glare generated in light path, and optical filtering can eliminate the interference fringe in light path and improve imagewise uniform perpendicular to 10 °~30 ° slant settings of optical axis direction.
Description
Technical field
The invention belongs to ultra-high speed transient imaging fields, and in particular to the compensation in multisequencing laser shadowgraph, which filters, to be filled
It sets.
Background technology
With the development of China's Aerospace Technology, weaponry and basic subject, it is related to hypervelocity aerodynamics, ultrahigh speed
It collides, exploding deepens continuously with the research in the fields such as impact, burning and chemical reaction.In these research work, many phenomenons
It is only microsecond even the ultra-high speed transient change procedure of nanosecond the duration to be, needing a kind of photographic system can be to this
That process carries out is clear, continuously record by imaging, to grasp the essence of physical phenomenon.This photographic system requires to reach in addition to amplitude-frequency
To 10,000,000 width/second (i.e. exposure image time most short 100ns), imaging sequences can be carried out to ultra-high speed transient change procedure
Outside, it is necessary to ensure that the resolution ratio of each image is sufficiently high, the time for exposure is short enough, to improve imaging definition, reduces super
High-speed motion causes the fuzzy distortion of image.
When domestic only Chinese Academy of Sciences Xi'an ray machine institute, Shenzhen University can produce sequence quantity more than 8, exposure image at present
Between be more than the rotary mirror type framing film imaging systems of 200 nanoseconds, by the way of using machinery rotation, when the exposure of each image
Between be difficult to be less than 100ns.Domestic digital formula imaging sequences system is also immature in development and production, it is difficult to meet engineering
It needs.External sequence quantity is more than 8, and the time for exposure is less than the very high speed digital imaging system technology comparative maturity of 100ns, leads to
Imaging sequences are realized frequently with expensive nanosecond electro-optical shutter, but this kind of high-end product is imposed embargo to China and technology envelope
Lock.
In order to meet ultrahigh speed object variations process multi-sequence im-aging, multisequencing laser shadowgraph system is developed, has been somebody's turn to do
Photographic system is divided in different spatial and deviation principle using multibeam laser light source light beam, realizes that multi-beam carries out weight
It closes or detaches to be individually imaged to same target.Multisequencing laser shadowgraph system is mainly saturating including light-source system, directional light
Penetrate imaging device, imaging system and data Collection ＆ Processing System.
Due to the self-luminous of ultrahigh speed phenomenon often accompanied by intense, in the imaging system using multisequencing shadowgraph system
These self-luminous can generate the information of test target interference when imaging, be placed at present in imaging system when usual solution narrow
Band optical filtering carries out veiling glare filtering.But because of the monochromatic laser light source that multisequencing shadowgraph system uses, when placing optical filtering
Undesirable interference fringe can be generated in the optical path, and in addition the transmissivity relative to the different angle incident light of optical filtering differs
Sample causes imaging beam uneven, influences image quality, or even the photo obtained can not use.
Invention content
The purpose of the present invention is to provide a kind of device, realize to 2~8 imaging sequences of ultrahigh speed object variations process, solution
The certainly imaging facula uniformity and veiling glare filtration problem in the imaging of ultrahigh speed object variations process sequence.
In order to achieve the above-mentioned object of the invention, technical scheme is as follows：
A kind of compensation filtering apparatus in multisequencing laser shadowgraph, described device includes the density gradual change of drop-over successively
Optical filter, image-forming objective lens and optical filtering；
Density wedge filter clear aperture be 25mm, material BK7,532nm optical densities variation range 0.08~
2.0；
The focal length of image-forming objective lens is 118mm, clear aperture 25mm；
Optical filtering clear aperture is 25.4mm, centre wavelength 532nm, bandwidth 10nm, thickness 1.5mm, normal incidence
When transmissivity be 75%, optical filtering is perpendicular to 10 °~30 ° slant settings of optical axis direction.
Further, image-forming objective lens are formed by being organized before image-forming objective lens with group after image-forming objective lens, and material is organized before image-forming objective lens and is
BK7, refractive index 1.580, Abbe constant 64.169998, center thickness 15.06mm, curvature be respectively 807.2mm,
25.76mm；It is SF1 that material is organized after image-forming objective lens, and refractive index 1.71736, Abbe constant 29.511, center thickness is
14.32mm, curvature are respectively -25.76,48.41mm.
Further, the one side plating Ni-Cr-Fe of density wedge filter adds SiO protection film layers, and it is anti-reflection that another side plates 532nm
Film.
Beneficial effects of the present invention：1 optical filtering is positioned over after image-forming objective lens, eliminates the veiling glare generated in light path, is filtered
Mirror can eliminate the interference fringe in light path and improve imagewise uniform perpendicular to 10 °~30 ° slant settings of optical axis direction.2.
Density wedge filter is placed before image-forming objective lens, when can eliminate optical filtering slant setting caused by perpendicular to optical axis direction
Light beam is different in the light intensity of different places, realizes the uniformity of imaging beam.
Description of the drawings
Fig. 1 is the light channel structure figure of present invention compensation filtering apparatus；
Fig. 2 is the enlarged drawing of image-forming objective lens in present invention compensation filtering apparatus；
Fig. 3 is to compensate filtering apparatus imaging system light path arrangement in multisequencing laser shadowgraph system in embodiment to show
It is intended to.
Specific implementation mode
The specific implementation mode of the present invention is described in further detail below in conjunction with the accompanying drawings：
Compensation filtering apparatus in a kind of multisequencing laser shadowgraph, as shown in Figure 1, described device includes drop-over successively
Density wedge filter 1, image-forming objective lens 2 and optical filtering 3, contour structures are as shown in Figure 1.
The clear aperture of density wedge filter 1 is 25mm, material BK7, in 532nm optical densities variation range 0.08
~2.0, wherein one side plating Ni-Cr-Fe adds SiO protection film layers, another side to plate 532nm anti-reflection films.Density wedge filter is used for
The consistent uniform beam of light intensity is generated to the non-uniform beam of light of light intensity gradual change.
Image-forming objective lens 2 are a balsaming lens, are made of group 5 after organizing 4 and image-forming objective lens before image-forming objective lens, contour structures
As shown in Fig. 2, it is BK7 to organize 4 materials before image-forming objective lens, refractive index 1.580, Abbe constant 64.169998, center thickness is
15.06mm, curvature are respectively 807.2mm (convex surface), 25.76mm (convex surface)；It is SF1 that 5 materials are organized after image-forming objective lens, and refractive index is
1.71736, Abbe constant 29.511, center thickness 14.32mm, curvature respectively -25.76 (concave surfaces), 48.41mm are (convex
Face).Image-forming objective lens carry out blur-free imaging for combining other object lens to realize to target.
3 clear aperture of optical filtering is 25.4mm, centre wavelength 532nm, bandwidth 10nm, thickness 1.5mm, normal incidence
When transmissivity be 75%, the focal lengths of image-forming objective lens 2 is 118mm, clear aperture 25mm, perpendicular to 10 °~30 ° of optical axis direction
Slant setting.Optical filtering realizes the different size of decaying of energy when being placed for self luminous elimination and different angle.
Embodiment 1
Layout drawing of the filtering apparatus in imaging sequences light path is compensated as shown in figure 3, from multisequencing laser shadowgraph imaging
The light beam (901) that comes out of colimated light system (10) by the first beam splitter (601) carry out light splitting as First ray light beam (903) and
Second sequence light beam (904), places the first collimating mirror (701), then place the first compensation first in First ray light beam (903)
Filtering apparatus (101) and the first imaging CCD (801).Second sequence light beam (904) is divided into third by the second beam splitter (902) again
Sequence light beam (905) and the 4th sequence light beam (902), the second collimating mirror is placed in third sequence light beam (905) first
(702), then place the second compensation filtering apparatus (102) and second imaging CCD (802).
Wherein, the compensation filtering apparatus placement location in other sequence light beams is the same as First ray light beam (903) and third sequence
Row light beam (905) is similar.
Optical filtering 3 is placed in the imaging system light path of multisequencing laser shadowgraph system, to eliminate the influence of veiling glare, but
It needs to 3 placement inclined by a certain angle of optical filtering, it can be to avoid occurring undesirable interference fringe in light path when slant setting.
, will be uneven through the light beam of optical filtering 3 after 3 slant setting of optical filtering, therefore placed in advance respectively in the light path of imaging system
A different density wedge filter 1 of position transmissivity, the strong and weak place of transmissivity is just with independent through after optical filtering
Light beam power is on the contrary, realize the uniformity of light beam with this.
Claims (1)
1. the compensation filtering apparatus in a kind of multisequencing laser shadowgraph, which is characterized in that described device includes drop-over successively
Density wedge filter (1), image-forming objective lens (2) and optical filtering (3)；
Density wedge filter (1) clear aperture be 25mm, material BK7,532nm optical densities variation range 0.08~
2.0, the one side plating Ni-Cr-Fe of density wedge filter (1) adds SiO protection film layers, another side to plate 532nm anti-reflection films；
Image-forming objective lens (2) are made of group (5) after group before image-forming objective lens (4) and image-forming objective lens, and group (4) material is before image-forming objective lens
BK7, refractive index 1.580, Abbe constant 64.169998, center thickness 15.06mm, curvature be respectively 807.2mm,
25.76mm；Group (5) material is SF1 after image-forming objective lens, and refractive index 1.71736, Abbe constant 29.511, center thickness is
14.32mm, curvature are respectively -25.76,48.41mm；
The focal length of image-forming objective lens (2) is 118mm, clear aperture 25mm；
Optical filtering (3) clear aperture is 25.4mm, centre wavelength 532nm, bandwidth 10nm, thickness 1.5mm, normal incidence when
Transmissivity is 75%, and optical filtering (3) is perpendicular to 10 °~30 ° slant settings of optical axis direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510801314.6A CN105425528B (en) | 2015-11-20 | 2015-11-20 | Compensation filtering apparatus in multisequencing laser shadowgraph |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510801314.6A CN105425528B (en) | 2015-11-20 | 2015-11-20 | Compensation filtering apparatus in multisequencing laser shadowgraph |
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| Publication Number | Publication Date |
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| CN105425528A CN105425528A (en) | 2016-03-23 |
| CN105425528B true CN105425528B (en) | 2018-10-02 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205247029U (en) * | 2015-11-20 | 2016-05-18 | 中国空气动力研究与发展中心超高速空气动力研究所 | Compensation filter among multi -sequence laser shade photographic system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4508521B2 (en) * | 2002-07-16 | 2010-07-21 | オリンパス株式会社 | Imaging device |
| CN104238121B (en) * | 2014-07-11 | 2017-08-04 | 中国空气动力研究与发展中心超高速空气动力研究所 | Aperture filtering apparatus for sequence laser shadowgraph system |
| CN105044885B (en) * | 2015-06-23 | 2018-03-16 | 信华精机有限公司 | A kind of optical imaging system for vehicle-mounted monitoring |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN205247029U (en) * | 2015-11-20 | 2016-05-18 | 中国空气动力研究与发展中心超高速空气动力研究所 | Compensation filter among multi -sequence laser shade photographic system |
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