CN106932345A - A kind of light Kerr-gate gating trajectory light micro imaging system of SLWD - Google Patents
A kind of light Kerr-gate gating trajectory light micro imaging system of SLWD Download PDFInfo
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- CN106932345A CN106932345A CN201710245539.7A CN201710245539A CN106932345A CN 106932345 A CN106932345 A CN 106932345A CN 201710245539 A CN201710245539 A CN 201710245539A CN 106932345 A CN106932345 A CN 106932345A
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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Abstract
The invention discloses a kind of light Kerr-gate gating trajectory light micro imaging system of SLWD.SLWD micro-imaging optical system of the invention includes the first lens, the second lens, the 3rd lens, the 4th lens, the 5th polarizer, the 6th kerr medium and the 7th polarizer, the 8th lens, the 9th lens, the tenth lens, the 11st lens that are arranged from left to right along same optical axis.The enlargement ratio of long reach micro optical system of the invention is 5X, and numerical aperture is 0.1, and operating distance reaches more than 200 millimeters.The light Kerr-gate gating trajectory light micro-imaging optical system works of SLWD of the present invention are highly suitable for studying internal combustion engine injected fuel spray near field region inside fine structure apart from overlength, good imaging quality.
Description
Technical field
The invention belongs to optical microphotograph imaging system design field, it is adaptable to inside internal combustion engine injected fuel spray near field region
Fine structure is studied.
Background technology
In the scattering mediums such as biological tissue, colloidal solution, air, due to the scattering of light, it is difficult to directly to these scatterings
Media interior structure or hiding object are imaged.Therefore, people have developed various targets that are suitable in scattering medium seeing
The optical image technology of survey.This kind of optical image technology is the research of the subjects such as life science, medical science, material science, physics,
There is provided strong analysis and testing tool, it is widely used in the identification of early carcinoma organizational diagnosis, material tests and fuzzy object
Deng field, with important application value.
In general, when light beam is by containing trajectory light, snakelike light and scattering light three after scattering medium, in emergent light
Plant composition.Wherein, trajectory is just in emergent light without the part of scattering, and travel path is short, shooting angle and incident angle basic
Cause, the outgoing from scattering medium at first carries the image-forming information of target in scattering medium；Experienced in snakelike just emergent light few
Amount scattered portion, along the axis of incident light, with slightly larger solid angle outgoing, carries a small amount of image-forming information；Scattering just goes out
Penetrate and multiple scatter part is experienced in light, scattered in 4 π solid angles, direct image-forming information is not carried, when imaging is participated in, dissipate
Penetrating light can seriously reduce image contrast and resolution ratio.Light Kerr-gate gating trajectory photoimaging technology is that one kind is suitable to scattering medium
The direct imaging technology of the high time resolution of interior target observation.It passes through scattering medium by the use of the femtosecond pulse as detection light
Afterwards, trajectory light composition keeps incident pulse shape in time-domain, the characteristic of composition broadening in time-domain is scattered, using light gram
A kind of Er Men (ultrafast time gate) gatings carry the trajectory light of information on target object in scattering medium, prevent to produce a large amount of of noise
Scattering light, and then scattering medium internal objects are imaged.
(the also referred to as high velocity fuel inside the high velocity fuel spray flow field near the engine nozzle such as liquid-propellant rocket engine
The near field region of spray flow field), turbulence intensity is big, and change is fast, and the drop density that liquid karyorrhexis is formed is high, there is very strong light and dissipates
Penetrate.For the fuel fluid karyorrhexis in the region with important research meaning and atomization process, lack always for a long time effective
Observation procedure.Recent researcher has found that light Kerr-gate gating trajectory photoimaging technology has excellent scattered photon concurrently and suppresses energy
The characteristics of power and high temporal resolution, the liquid karyorrhexis process in the near field region to high velocity fuel spray flow field that is especially suitable for is entered
Row transient state is imaged, and has important application valency in the engine internal high velocity fuel spray flow field research field such as liquid-propellant rocket engine
Value.
The severe rugged environment of HTHP is often operated in due to injected fuel spray field, in order to avoid pollution and the damage of optical element
Wound, while avoid external device (ED) from impacting injected fuel spray field characteristic, existing smooth Kerr-gate gating trajectory photoimaging systems
In order to ensure operating distance more long, its resolution ratio is often relatively low, and its typical space resolution ratio is about 50 microns.In order to study spray
The microcell characteristics such as the fine structure characteristic in Wu Chang near field regions in the kinetic characteristic of fine droplet, fuel ligament structure, need
To use light Kerr-gate gating trajectory light micro imaging system.However, simple traditional Guang Keer using existing microcobjective
Door gating trajectory light micro imaging system, due to the limitation of microcobjective, its operating distance is generally less than 50 millimeters, it is impossible to should
For the research of liquid fuel spray near field region.
The content of the invention
Present invention solves the problem in that providing a kind of light Kerr-gate gating trajectory light micro-imaging of SLWD
The design of system, the system has SLWD, and up to more than 200 millimeters, optical element quantity is few, low cost, tool
There is high-resolution, image quality is excellent, close to diffraction limit, the micro-imaging of spray field near field region fine structure can be realized.
In order to realize goal of the invention, concrete technical scheme of the invention is as follows：
A kind of light Kerr-gate gating trajectory light micro imaging system of SLWD, along same optical axis from left to right according to
It is secondary to be arranged with：First lens, the second lens, the 3rd lens, the 4th lens constitute the first light group；5th polarizer, the 6th Ke Er
Medium and the 7th polarizer constitute the second light group；8th lens, the 9th lens, the tenth lens, the 11st lens constitute the 3rd light
Group, three groups are arranged in order.
First lens and the second lens group gluing unit in pairs, the first lens use negative lens, the second lens to use positive lens,
3rd lens use positive biconvex lens, the 4th lens to use diverging meniscus lens.
First light group is improved using the 4th lens with the first lens, the second lens, the remote separate optical texture of the 3rd lens
Aberration.
Described operating distance W.D. is 200mm~250mm, and enlargement ratio is more than or equal to 5X, and numerical aperture NA is 0.1,
Minimum resolution σ is 5 μm.
5th polarizer and the 7th polarizer are completely orthogonal.
6th kerr medium uses carbon disulfide material.
3rd light group is used and formed on the symmetrical knot of kerr medium with the first identical structure of light group, whole system
Structure.
Technique effect
The light Kerr-gate gating trajectory light micro imaging system of SLWD of the present invention realizes 200mm~250mm
In the range of SLWD, 5 μm of minimum resolution and the enlargement ratio more than or equal to 5X.First light group is by using
4th lens and the first lens, the second lens, the cooperation of the 3rd positive negative power of lens and remote separate optical texture, realize
The SLWD of 200mm~250mm.Additionally, the present invention is capable of achieving times magnification by the placement location of mobile 3rd light group
The continuous change of rate 5X and the above, meets the observation demand of different enlargement ratios, and each light group independence aberration correction is intact, all the time
Get a distinct image.By the optimization design to the first light group, the second light group and the 3rd light group, symmetrical structure is formed, rationally divided
Match system each several part constitutes structure, solves place that SLWD light Kerr-gate gating trajectory light micro-imaging introduces, abnormal
The problem of the optical aberrations such as change, astigmatism, realizes the high-resolution micro-imaging of extra long distance, overcomes traditional light Kerr-gate gating bullet
Road light micro imaging system operating distance is short, the atomized drop pollution that lens are easily existed by injected fuel spray near field region, and quilt
High pressure, high temperature, the shortcoming of heavily stressed environmental damage, are particularly well-suited to engine fuel spray field near field region fine structure
At a distance, high-resolution micro-imaging.
Brief description of the drawings
Fig. 1 is the structural representation of the light Kerr-gate gating trajectory light micro imaging system of SLWD of the present invention；
Fig. 2 is the transmission function figure of the light Kerr-gate gating trajectory light micro imaging system of SLWD of the present invention；
Fig. 3 is the vertical axial aberration curve of the light Kerr-gate gating trajectory light micro imaging system of SLWD of the present invention
Figure；
Fig. 4 is that the curvature of field/distortion of the light Kerr-gate gating trajectory light micro imaging system of SLWD of the present invention is bent
Line chart.
Specific embodiment
As shown in figure 1, dividing before and after a kind of light Kerr-gate gating trajectory light micro imaging system of SLWD, system
Constituted into three light groups, it is characterised in that be arranged in sequence with from left to right along same optical axis：First lens, the second lens, the 3rd
Lens, the 4th lens constitute the first light group；5th polarizer, the 6th kerr medium and the 7th polarizer constitute the second light group；The
Eight lens, the 9th lens, the tenth lens, the 11st lens constitute the 3rd light group.In the system：The bore of the first lens is 46
Millimeter, center thickness is 8 millimeters, and left sphere curvature radius is -576 millimeters, and right sphere curvature radius is -50 millimeters, the glass of use
The glass trade mark is K9；The bore of the second lens is 46 millimeters, and center thickness is 5 millimeters, and left sphere curvature radius is -50 millimeters, right ball
Curvature radius are -112 millimeters, and the glass trade mark for using is ZF6, away from 0 millimeter of the first lens；The bore of the 3rd lens is 46 millis
Rice, center thickness is 7 millimeters, and left sphere curvature radius is 186 millimeters, and right sphere curvature radius is -146 millimeters, the glass of use
The trade mark is K9, away from 20 millimeters of the second lens；The bore of the 4th lens is 46 millimeters, and center thickness is 7 millimeters, left sphere curvature radius
It it is 124 millimeters, right sphere curvature radius is 74 millimeters, and the glass trade mark for using is K9, away from 51 millimeters of the 3rd lens；5th polarization
The bore of device is 15 millimeters, and center thickness is 23 millimeters, away from 891 millimeters of the 4th lens；The bore of the 6th kerr medium is 4 millimeters,
Center thickness is 23 millimeters, away from 25 millimeters of the 5th polarizer；The bore of the 7th polarizer is 15 millimeters, and center thickness is 23 millimeters, away from
6th 25 millimeters of kerr medium；The bore of the 8th lens is 46 millimeters, and center thickness is 8 millimeters, and left sphere curvature radius is -576
Millimeter, right sphere curvature radius is -50 millimeters, and the glass trade mark for using is K9, away from 291 millimeters of the 7th polarizer；9th lens
Bore be 46 millimeters, center thickness be 5 millimeters, left sphere curvature radius be -50 millimeters, right sphere curvature radius be -112 milli
Rice, the glass trade mark for using is ZF6, away from 0 millimeter of the 8th lens；The bore of the tenth lens is 46 millimeters, and center thickness is 7 millimeters,
Left sphere curvature radius is 186 millimeters, and right sphere curvature radius is -146 millimeters, and the glass trade mark for using is K9, saturating away from the 9th
20 millimeters of mirror；The bore of the 11st lens is 46 millimeters, and center thickness is 7 millimeters, and left sphere curvature radius is 124 millimeters, right ball
Curvature radius are 74 millimeters, and the glass trade mark for using is K9, away from 51 millimeters of the tenth lens.
In three light groups of the invention, the first light group realizes a SLWD microcobjective, the second light group reality
Light Kerr-gate gating trajectory photo structure is showed, the 3rd light group is used as eyepiece system.
In first light group of the invention, by the first lens and the second lens group gluing unit in pairs, the first lens are using negative saturating
Mirror, the second lens use positive lens, the 3rd lens to use positive biconvex lens, the 4th lens to use diverging meniscus lens.
In second light group of the invention, the 5th polarizer and the 7th polarizer are completely orthogonal, and masking initial polarization direction does not have
There is the incident light of change, the 6th kerr medium changes the polarization direction of transmitted light, so as to constitute ultrafast time gate, carries in time
Take the trajectory photon for carrying object image-forming information.
3rd light group of the invention is made up of the 8th lens, the 9th lens, the tenth lens, the 11st lens, with the first light
Group is identical, and aberration correction is good, easy to process.
First light group realizes SLWD microcobjective, and feature essentially consists in its applied environment：Structure of Internal-Combustion Engine
It is huge, and spraying near field region inside is high-temperature and high-stress, there are a large amount of drops, easily changes lens arrangement, pollutes lens surface,
Make the nearly mist fine structure of research difficult.Therefore the microcobjective of SLWD is needed to realize to spraying near field region
The research of fine structure.
The object lens are the clear micro- flat field imaging for realizing SLWD, will necessarily introduce the curvature of field, spherical aberration, color
The severe aberrations such as difference, astigmatism, spy uses the optical texture that the 4th meniscus lens far separate for negative lens and with first three piece lens
Improve aberration, negative lens can improve curvature of field aberration, and remote isolating construction can greatly increase operating distance and can improve ball
Difference, aberration and astigmatism problem.
The light Kerr-gate gating trajectory light micro imaging system of SLWD its operation principle is：Laser is used as detection
Optical illumination is incident, and detection light passes sequentially through the first lens, the second lens, the 3rd lens, the 4th lens, inclined at the 5th polarizer
The direction that shakes is filtered out perpendicular to the light beam of the polarizer, and remainder light beam continues to transmit；Light beam is imaged by the first light group microcobjective,
6th kerr medium is placed at object lens image planes, light beam enters the 7th polarizer, because polarization direction is perpendicular to polarizer side
To, it is impossible to pass through；Pump light enters the 6th kerr medium from side, and kerr medium produces Kerr effect to change light beam polarization side
To by the 7th polarizer；Object lens imaging constitutes picture as secondary object plane by the 3rd light, and eyepiece system is placed on into distance the
Make at the nearly two times of focal lengths of seven polarizers its 1:1 is imaged on CCD；Can realize that overlength works by changing the 3rd light group placement location
Apart from the imaging of femtosecond light Kerr-gate gating trajectory light micro imaging system zoom, the enlargement ratio of 5X and the above is realized.
Fig. 2 is the image planes transmission letter of SLWD femtosecond light Kerr-gate gating trajectory light micro imaging system of the present invention
Number curve figure, a represents 0.78 mum wavelength light, and b represents 0.80 mum wavelength light, and c represents 0.82 mum wavelength light, can be obtained from figure
In the situation of 0 visual field, 0.7 visual field and full filed, image planes optical transfer function is more than image planes transmission function at 40lp/mm
0.05。
Fig. 3 is that the vertical axial aberration of SLWD femtosecond light Kerr-gate gating trajectory light micro imaging system of the present invention is bent
Line chart, a represents 0.78 mum wavelength light, and b represents 0.80 mum wavelength light, and c represents 0.82 mum wavelength light, and ordinate maximum is in figure
± 5 microns, white light curve shape is similar, and deviation Maximum constraint is within 3 microns.
Fig. 4 is the curvature of field/distortion of SLWD femtosecond light Kerr-gate gating trajectory light micro imaging system of the present invention
Curve map, a represents 0.78 mum wavelength light, and b represents 0.80 mum wavelength light, and c represents 0.82 mum wavelength light, as seen from the figure whole system
The greatest optical distortion of system is less than 2%.
Claims (7)
1. a kind of light Kerr-gate gating trajectory light micro imaging system of SLWD, is divided into three light group structures before and after system
Into, it is characterised in that it is arranged in sequence with from left to right along same optical axis：It is first lens, the second lens, the 3rd lens, the 4th saturating
Microscope group is into the first light group；5th polarizer, the 6th kerr medium and the 7th polarizer constitute the second light group；8th lens, the 9th
Lens, the tenth lens, the 11st lens constitute the 3rd light group, and three groups are arranged in order.
2. the light Kerr-gate gating trajectory light micro imaging system of a kind of SLWD according to claim 1, its
It is characterized in：First lens and the second lens group gluing unit in pairs, the first lens use negative lens, the second lens to use positive lens,
3rd lens use positive biconvex lens, the 4th lens to use diverging meniscus lens.
3. the light Kerr-gate gating trajectory light micro imaging system of a kind of SLWD according to claim 1, its
It is characterised by, the first light group is improved using the 4th lens with the first lens, the second lens, the remote separate optical texture of the 3rd lens
Aberration.
4. the light Kerr-gate gating trajectory light micro imaging system of a kind of SLWD according to claim 1, its
It is characterised by, operating distance W.D. is 200mm~250mm, enlargement ratio is more than or equal to 5X, and numerical aperture NA is 0.1, minimum point
Resolution σ is 5 μm.
5. the light Kerr-gate gating trajectory light micro imaging system of a kind of SLWD according to claim 1, its
It is characterised by, the 5th polarizer and the 7th polarizer are completely orthogonal.
6. the light Kerr-gate gating trajectory light micro imaging system of a kind of SLWD according to claim 1, its
It is characterised by, the 6th kerr medium uses carbon disulfide material.
7. the light Kerr-gate gating trajectory light micro imaging system of a kind of SLWD according to claim 1, its
It is characterised by, the 3rd light group uses and formed symmetrical on kerr medium with the first identical structure of light group, whole system
Structure.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114509780A (en) * | 2022-01-25 | 2022-05-17 | 西北大学 | Distance measurement excitation type underwater dynamic target long-distance gating polarization imaging device and method |
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| CN103558676A (en) * | 2013-11-07 | 2014-02-05 | 梧州奥卡光学仪器有限公司 | Six-time over-long working distance objective lens |
| CN104914644A (en) * | 2015-05-25 | 2015-09-16 | 西安交通大学 | Femtosecond optical Kerr gate gated imaging device and method based on directional filtering |
| CN205844614U (en) * | 2016-07-29 | 2016-12-28 | 南京恒磊光学技术研究有限公司 | A kind of large-numerical aperture, the microscope objective of long reach |
| CN206074901U (en) * | 2016-10-14 | 2017-04-05 | 深圳市洽美斯科技有限公司 | A kind of big visual field high magnified glass |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558676A (en) * | 2013-11-07 | 2014-02-05 | 梧州奥卡光学仪器有限公司 | Six-time over-long working distance objective lens |
| CN104914644A (en) * | 2015-05-25 | 2015-09-16 | 西安交通大学 | Femtosecond optical Kerr gate gated imaging device and method based on directional filtering |
| CN205844614U (en) * | 2016-07-29 | 2016-12-28 | 南京恒磊光学技术研究有限公司 | A kind of large-numerical aperture, the microscope objective of long reach |
| CN206074901U (en) * | 2016-10-14 | 2017-04-05 | 深圳市洽美斯科技有限公司 | A kind of big visual field high magnified glass |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114509780A (en) * | 2022-01-25 | 2022-05-17 | 西北大学 | Distance measurement excitation type underwater dynamic target long-distance gating polarization imaging device and method |
| CN114509780B (en) * | 2022-01-25 | 2024-05-28 | 西北大学 | Range-finding excitation type underwater dynamic target long-distance gating polarization imaging device and method |
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