CN205247029U - Compensation filter among multi -sequence laser shade photographic system - Google Patents
Compensation filter among multi -sequence laser shade photographic system Download PDFInfo
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- CN205247029U CN205247029U CN201520930307.1U CN201520930307U CN205247029U CN 205247029 U CN205247029 U CN 205247029U CN 201520930307 U CN201520930307 U CN 201520930307U CN 205247029 U CN205247029 U CN 205247029U
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Abstract
The utility model belongs to hypervelocity transient state formation of image field relates to a compensation filter among multi -sequence laser shade photographic system, the device is including arranging density graduated filter, formation of image objective and the optical filtering that connects in proper order, density graduated filter aperture is 25mm, and the material is BK7, optical density excursion 0.08-2.0 when 532nm, the focus of formation of image objective is 118mm, and aperture is 25mm, optical filtering aperture is 25.4mm, center wavelength, and to be 532nm, bandwidth be 10nm, the transmission rate was 75% when thickness was 1.5mm, normal incidence, and 10-30 slopes in the optical filtering perpendicular to optical axis direction are placed. The utility model discloses the optical filtering is placed in formation of image after the objective, eliminates the parasitics light that produces in the light path, and 10-30 slopes in the optical filtering perpendicular to optical axis direction are placed, can eliminate the interference fringe in the light path and improves the formation of image homogeneity.
Description
Technical field
The utility model belongs to ultrahigh speed transient state imaging field, is specifically related to multisequencing laser shadowgraphCompensation filtering apparatus in system.
Background technology
Along with the development of China's Aerospace Technology, weaponry and basic subject, relate to ultrahigh speed air movingThe research in the fields such as mechanics, hypervelocity impact, blast and impact, burning and chemical reaction deepens continuously.In these research work, many phenomenons are to be only the even ultrahigh speed wink of nanosecond of microsecond the durationState change procedure, need to have a kind of photographic system to carry out clear, imaging continuously to this processRecord, to grasp the essence of physical phenomenon. This photographic system except amplitude-frequency require reach 1,000 ten thousandWidth/second, (being exposure image shortest time 100ns), can carry out sequence to ultrahigh speed transient changing processOutside imaging, also must guarantee that the resolution ratio of every width image is enough high, the time for exposure is enough short, thereby carriesHigh imaging definition, reduces ultrahigh speed motion and causes the fuzzy distortion of image.
At present domestic only have Xi'an ray machine institute of the Chinese Academy of Sciences, Shenzhen University can production sequence quantity be greater than 8,The exposure image time is greater than the rotary mirror type framing film imaging system of 200 nanoseconds, owing to adopting machinery to revolveThe mode turning, the time for exposure of every width image is difficult to be less than 100ns. Domestic digital sequence imaging systemAlso immature on research and production, be difficult to meet the needs of through engineering approaches. External sequence quantity is greater than 8Individual, the time for exposure is less than the ultrahigh speed digital imaging system technology comparative maturity of 100ns, conventionally adoptsExpensive nanosecond electro-optical shutter is realized sequence imaging, but this class high-end product is imposed embargo to China andBlockade on new techniques.
In order to meet the imaging of ultrahigh speed object variations process multisequencing, develop multisequencing laser shade and shonePhase system, this photographic system is to utilize multibeam laser light source light beam to enter in different spatial and deviation principleRow light splitting, realizes multi-beam and overlaps or separate with to the independent imaging of same target. Multisequencing laserShadowgraph system mainly comprises light-source system, directional light transmission imaging device, imaging system and dataGather and treatment system.
Due to the often self-luminous of accompanied by intense of ultrahigh speed phenomenon, utilizing multisequencing shadowgraph systemImaging system imaging time these self-luminous meetings the information of test target is produced and is disturbed, ordinary solution at presentWhen the way of determining, place narrow-band filter in imaging system and carry out veiling glare filtration. But because multisequencing shade shinesThe one-wavelength laser light source that phase system uses can produce less desirable interference while placing optical filtering in light pathStriped, different with respect to the transmissivity of the different angles incident light of optical filtering in addition, cause imagingRestraint inhomogeneously, affect image quality, the photo even obtaining cannot use.
Utility model content
The purpose of this utility model is to provide a kind of device, realize to ultrahigh speed object variations process 2～8 sequence imagings, solve the imaging facula uniformity in the imaging of ultrahigh speed object variations process sequence and mixLight filtration problem.
In order to realize above-mentioned utility model object, the technical solution of the utility model is as follows:
A compensation filtering apparatus in multisequencing laser shadowgraph system, described device comprises successivelyAlong the density wedge filter, image-forming objective lens and the optical filtering that connect;
Density wedge filter clear aperture is 25mm, and material is BK7, and in the time of 532nm, optical density becomesChange scope 0.08～2.0;
The focal length of image-forming objective lens is 118mm, and clear aperture is 25mm;
Optical filtering clear aperture is that 25.4mm, centre wavelength are that 532nm, bandwidth are that 10nm, thickness areWhen 1.5mm, normal incidence, transmissivity is 75%, and optical filtering is put perpendicular to 10 °～30 ° inclinations of optical axis directionPut.
Further, image-forming objective lens by image-forming objective lens before group and image-forming objective lens after group form, before image-forming objective lensGroup material is BK7, and refractive index is 1.580, and Abbe constant is 64.169998, and center thickness is15.06mm, curvature is respectively 807.2mm, 25.76mm; After image-forming objective lens, organizing material is SF1, refractionRate is 1.71736, and Abbe constant is 29.511, and center thickness is 14.32mm, curvature is respectively-25.76,48.41mm。
Further, the one side of density wedge filter plating Ni-Cr-Fe adds SiO protective film, another sidePlating 532nm anti-reflection film.
The beneficial effects of the utility model: after 1 optical filtering is positioned over image-forming objective lens, eliminates in light path and produceRaw veiling glare, optical filtering, perpendicular to 10 °～30 ° slant settings of optical axis direction, can be eliminated in light pathInterference fringe and improve imaging uniformity. 2. before image-forming objective lens, place density wedge filter, canWhen eliminating optical filtering slant setting at the light beam causing perpendicular to optical axis direction in different local light intensityDifferent, realize the uniformity of imaging beam.
Brief description of the drawings
Fig. 1 is the light channel structure figure of the utility model compensation filtering apparatus;
Fig. 2 is the enlarged drawing of image-forming objective lens in the utility model compensation filtering apparatus;
Fig. 3 compensates filtering apparatus imaging system in multisequencing laser shadowgraph system in embodimentLight path arrangement schematic diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described in further detail:
A compensation filtering apparatus in multisequencing laser shadowgraph system, as shown in Figure 1, described inDevice comprises suitable density wedge filter 1, image-forming objective lens 2 and the optical filtering 3 connecing successively, its profile knotStructure as shown in Figure 1.
The clear aperture of density wedge filter 1 is 25mm, and material is BK7, close in the 532nm timeDegree excursion 0.08～2.0, wherein simultaneously plating Ni-Cr-Fe adds SiO protective film, another side plating532nm anti-reflection film. Density wedge filter, produces light intensity one for the non-homogeneous light beam to light intensity gradual changeThe uniform beam causing.
Image-forming objective lens 2 is a balsaming lens, by before image-forming objective lens, organize 4 and image-forming objective lens after organize 5 groupsBecome, as shown in Figure 2, before image-forming objective lens, group 4 materials are BK7 to its contour structures, and refractive index is 1.580,Abbe constant is 64.169998, and center thickness is 15.06mm, curvature be respectively 807.2mm (convex surface),(25.76mm convex surface); After image-forming objective lens, organizing 5 materials is SF1, and refractive index is 1.71736, and Abbe is normalNumber is 29.511, and center thickness is 14.32mm, and curvature is respectively-25.76 (concave surfaces), 48.41mm is (protrudingFace). Image-forming objective lens, for realizing target carried out to blur-free imaging in conjunction with other object lens.
Optical filtering 3 clear apertures are that 25.4mm, centre wavelength are that 532nm, bandwidth are 10nm, thicknessDuring for 1.5mm, normal incidence, transmissivity is 75%, and the focal length of image-forming objective lens 2 is 118mm, clear apertureFor 25mm, it is perpendicular to 10 °～30 ° slant settings of optical axis direction. Optical filtering, for self luminousElimination and different angles realize the decay of the different sizes of energy while placement.
Embodiment 1
Compensate the layout drawing of filtering apparatus in sequence imaging optical path as shown in Figure 3, from multisequencing laserColimated light system (10) in shade imaging light beam (901) is out entered by the first beam splitter (601)Row light splitting becomes First ray light beam (903) and the second sequence light beam (904), at First ray light beam(903) in, first place the first collimating mirror (701), then place the first compensation filtering apparatus (101)With the first imaging CCD (801). The second sequence light beam (904) is divided into by the second beam splitter (902) againThe 3rd sequence light beam (905) and the 4th sequence light beam (902), in the 3rd sequence light beam (905)First place the second collimating mirror (702), then place the second compensation filtering apparatus (102) and the second imagingCCD(802)。
Wherein, the compensation filtering apparatus placement location in other sequence light beam is with First ray light beam(903) the and three sequence light beam (905) is similar.
In the imaging system light path of multisequencing laser shadowgraph system, place optical filtering 3, to eliminate veiling glareImpact, but need to, to optical filtering 3 with certain angle slant setting, when slant setting, can avoid lightIn road, there is less desirable interference fringe. After optical filtering 3 slant settings, see through the light beam of optical filtering 3By inhomogeneous, therefore in the light path of imaging system, each position transmissivity of placement is different close in advanceDegree gradual filter 1, the place of its transmissivity power just with see through separately the strong and weak phase of light beam after optical filteringInstead, realize the uniformity of light beam with this.
Claims (3)
1. the compensation filtering apparatus in multisequencing laser shadowgraph system, is characterized in that, described inDevice comprises successively along the density wedge filter (1), image-forming objective lens (2) and the optical filtering (3) that connect;
Density wedge filter (1) clear aperture is 25mm, and material is BK7, optical density in the time of 532nmExcursion 0.08～2.0;
The focal length of image-forming objective lens (2) is 118mm, and clear aperture is 25mm;
Optical filtering (3) clear aperture is that 25.4mm, centre wavelength are that 532nm, bandwidth are 10nm, thicknessDuring for 1.5mm, normal incidence, transmissivity is 75%, and optical filtering (3) is perpendicular to 10 °～30 ° of optical axis directionsSlant setting.
2. the dress that filters of the compensation in a kind of multisequencing laser shadowgraph system according to claim 1Put, it is characterized in that, image-forming objective lens (2) by group before image-forming objective lens (4) and image-forming objective lens after group (5)Composition, before image-forming objective lens, group (4) material is BK7, and refractive index is 1.580, and Abbe constant is 64.169998,Center thickness is 15.06mm, and curvature is respectively 807.2mm, 25.76mm; Group after image-forming objective lens (5) materialMaterial is SF1, and refractive index is 1.71736, and Abbe constant is 29.511, and center thickness is 14.32mm, songRate is respectively-25.76,48.41mm.
3. the dress that filters of the compensation in a kind of multisequencing laser shadowgraph system according to claim 1Put, it is characterized in that, the one side plating Ni-Cr-Fe of density wedge filter (1) adds SiO protective film,Another side plating 532nm anti-reflection film.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520930307.1U CN205247029U (en) | 2015-11-20 | 2015-11-20 | Compensation filter among multi -sequence laser shade photographic system |
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| CN201520930307.1U CN205247029U (en) | 2015-11-20 | 2015-11-20 | Compensation filter among multi -sequence laser shade photographic system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425528A (en) * | 2015-11-20 | 2016-03-23 | 中国空气动力研究与发展中心超高速空气动力研究所 | Compensative filtering apparatus in multi-sequence laser shadowgraph |
| CN113655679A (en) * | 2020-05-12 | 2021-11-16 | 深圳市联赢激光股份有限公司 | Method for eliminating lamp shadow in laser welding process |
| CN114509911A (en) * | 2021-12-28 | 2022-05-17 | 中国空气动力研究与发展中心超高速空气动力研究所 | Coaxial superspeed multi-sequence laser shadow imaging device |
-
2015
- 2015-11-20 CN CN201520930307.1U patent/CN205247029U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425528A (en) * | 2015-11-20 | 2016-03-23 | 中国空气动力研究与发展中心超高速空气动力研究所 | Compensative filtering apparatus in multi-sequence laser shadowgraph |
| CN105425528B (en) * | 2015-11-20 | 2018-10-02 | 中国空气动力研究与发展中心超高速空气动力研究所 | Compensation filtering apparatus in multisequencing laser shadowgraph |
| CN113655679A (en) * | 2020-05-12 | 2021-11-16 | 深圳市联赢激光股份有限公司 | Method for eliminating lamp shadow in laser welding process |
| CN113655679B (en) * | 2020-05-12 | 2022-05-10 | 江苏联赢激光有限公司 | Method for eliminating lamp shadow in laser welding process |
| CN114509911A (en) * | 2021-12-28 | 2022-05-17 | 中国空气动力研究与发展中心超高速空气动力研究所 | Coaxial superspeed multi-sequence laser shadow imaging device |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160518 Termination date: 20161120 |
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| CF01 | Termination of patent right due to non-payment of annual fee |