CN206378636U - The common light path overall view ring belt optical imaging device of active polarization targets improvement - Google Patents
The common light path overall view ring belt optical imaging device of active polarization targets improvement Download PDFInfo
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- CN206378636U CN206378636U CN201720046225.XU CN201720046225U CN206378636U CN 206378636 U CN206378636 U CN 206378636U CN 201720046225 U CN201720046225 U CN 201720046225U CN 206378636 U CN206378636 U CN 206378636U
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- overall view
- ring belt
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Abstract
The utility model discloses a kind of common light path overall view ring belt optical imaging device of active polarization targets improvement, including overall view ring belt polarized illumination system and overall view ring belt polarized imaging system；Overall view ring belt polarized illumination system and the common light path of overall view ring belt imaging system, are arranged constituted successively by overall view ring belt lens, follow-up microscope group, polarization spectro component and target surface；The target surface of polarization spectro component side is lighting source, and the target surface of opposite side is image camera.The utility model realizes the common-denominator target detection of big field range high-contrast, using target object and the difference of background object polarization-maintaining performance, can strengthen the contrast of common-denominator target object and background environment, be conducive to target acquisition and tracking.More authentic and valid object polarization-maintaining performance information can be provided using Active Imaging mode.The utility model uses Common-path method, improves the robustness to environmental factors such as vibrations, and apparatus structure is compact, and the scale of construction is light and handy, is applicable to more severe working environment.
Description
Technical field
The utility model is related to a kind of imaging system of optical imaging field, more particularly to a kind of active polarization target increases
Strong common light path overall view ring belt optical imaging device.
Background technology
With the development of optical detector technology, big field optical imaging system is carried out because it has to a wide range of interior object
The ability of detection, has been widely used for the fields such as space exploration, military surveillance, safety monitoring, pipe endoscopic.Many application scenarios
Lightweight to big visual field optical detection system and it is high-effect propose requirement, needed such as vehicle, aircraft to around close
Need to realize efficient detection to a wide range of interior vehicle target etc. in the quick early warning of realization of goal, traffic monitoring.
Target can be found in the range of larger field by carrying out detection using panoramic optical imaging system.Traditional monoscopic is complete
Scape scanning imaging technology is rotated a circle acquisition a series of images using the system that is made up of single imaging lens, or each along 360 °
Individual direction is placed and image mosaic completion is carried out one group of single-lens progress is shot respectively simultaneously after, and the requirement of camera shooting condition is strict,
Image procossing is time-consuming longer, and real-time is not good enough, while its volume is larger, it is complicated.Based on the complete of plane cylinder projection theory
Scape annulus imaging technique is a kind of imaging technique different from conventional center projection theory, can be under conditions of without rotating, will
Surrounding objects are disposably imaged on single image sensor, and 360 ° of panorama staring imagings are realized from optical principle.Entirely
Scape annulus optical imaging system is a kind of big view field imaging system of refraction-reflection type, and small volume is lightweight, manufacture craft with it is common complete
Dioptric system is similar, and design method flexibly, can realize mesh effectively to the image objects in the big field range of surrounding
Mark detection.
The image that general imaging system is obtained easily is influenceed by outside environmental elements, for being hidden in natural background
Man-made target, the contrast of target and background is low so that target is difficult to be found in image, and this is in big field range
Target acquisition is very unfavorable.Therefore, it has been proposed that be expanded into as during the information dimension that obtains to realize targets improvement, improving
The recall rate of target, such as spectral information, depth information, polarization information.Wherein, the targets improvement imaging side based on polarization information
Formula can distinguish the polarization characteristic difference of target and background, while intensity and polarization information is obtained, and effectively enhancing image is thin
Section, improves the detection efficient under complex background.For culture such as vehicle, aircraft, these target surfaces compared with
To be smooth, when by polarized illumination, its reflected light can more efficiently keep degree of polarization, and natural background due to scatter compared with
To be serious, incident polarized light is after scattering, and its reflected light often has relatively low degree of polarization.It therefore, it can utilize object pair
The responding ability difference of incident polarized light realizes effective enhancing of target object.However, existing polarization targets improvement optics
The imaging system angle of visual field is relatively limited, it is impossible to effectively and rapidly optical detection and the enhancing of the realization of goal in big field range.
Often completed in addition, imaging process and polarization information are obtained under passive lighting condition, it is impossible to adapt to low-light environment, also make to obtain
The polarization information noise obtained is larger.
The content of the invention
The purpose of this utility model is being total to there is provided a kind of active polarization targets improvement in view of the shortcomings of the prior art
Light path overall view ring belt optical imaging device.
The purpose of this utility model is achieved through the following technical solutions：A kind of active polarization targets improvement is total to
Light path overall view ring belt optical imaging device, including overall view ring belt polarized illumination system and overall view ring belt polarized imaging system；Panorama
Annulus polarized illumination system and the common light path of overall view ring belt imaging system, by overall view ring belt lens, follow-up microscope group, polarization spectro component
And target surface is arranged composition successively；The target surface of polarization spectro component side is lighting source, and the target surface of opposite side is image camera.
Further, described polarization spectro component is by the wave plate of polarization converter, polarization beam apparatus and λ/4 successively arrangement group
Into；The wave plate of λ/4 is close to follow-up microscope group, and polarization converter is close to lighting source.
Further, the preceding surface of the overall view ring belt lens include preceding transmission plane and before preceding transmission plane center it is anti-
Penetrate face；Surface includes back reflection face and the rear transmission plane positioned at back reflection face center afterwards.
Further, the overall view ring belt lens are using double glued constructions.
The utility model beneficial effect is：
1. the utility model realizes the common-denominator target detection of big field range high-contrast.Utilize target object and background
The difference of object polarization-maintaining performance, can strengthen the contrast of common-denominator target object and background environment, be conducive to target acquisition and tracking.
With reference to ultra-wide angle overall view ring belt optical system, the target acquisition in big field range can be realized under conditions of one camera.
2. the utility model is integrated with illuminator and imaging system, using Active Imaging mode, can be in low light environment
Target is detected, inside such as pipeline, narrow space, underwater environment.Meanwhile, relative to imaging and passive imaging mode, the utility model is adopted
Active Imaging mode can provide more authentic and valid object polarization-maintaining performance information, and signal to noise ratio is higher.
3. the utility model uses Common-path method, the robustness to environmental factors such as vibrations is improved, apparatus structure is tight
Gather, the scale of construction is light and handy, is applicable to more severe working environment.
Brief description of the drawings
Fig. 1 is the utility model structural representation；
Fig. 2 is that index path of the present utility model and polarization state change schematic diagram；
Fig. 3 is the system construction drawing after the utility model optimization；
Fig. 4 is the MTF figures after present invention optimization；
In figure：Overall view ring belt lens 1, follow-up microscope group 2, polarization spectro component 3, lighting source 4, image camera 5, preceding transmission
Face 6, back reflection face 7, front-reflection face 8, rear transmission plane 9, the wave plate 10 of λ/4, polarization beam apparatus 11, polarization converter 12.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment is described in further detail to the utility model.
As shown in figure 1, a kind of common light path overall view ring belt optics for active polarization targets improvement that the utility model is provided
Imaging device, including overall view ring belt polarized illumination system and overall view ring belt polarized imaging system；Overall view ring belt polarized illumination system
Including coaxial mounted overall view ring belt lens 1, the follow-up microscope group 2 for being placed in the rear of overall view ring belt lens 1, the and of polarization spectro component 3
Lighting source 4；Overall view ring belt polarized imaging system include with overall view ring belt polarized illumination system share overall view ring belt lens 1,
Be placed in the follow-up lens group 2 at the rear of overall view ring belt lens 1, polarization spectro component 3 and with overall view ring belt polarized illumination system optical axis
Vertical image camera 5.
As shown in Fig. 2 lighting source 4 send for natural light, turn into p light after polarization converter 12, p light is by polarization
During beam splitter 11, it can be directed through along horizontal optical axis direction；Phase after the wave plate 10 of λ/4 is passed through by the p light of polarization beam apparatus 11
Changing pi/2 turns into right-circularly polarized light, and the right-circularly polarized light through overall view ring belt lens 1 by being projected to again after follow-up microscope group 2
Object space, realizes big field illumination.The object of object space is divided into two kinds of background object and target object, it is considered that, background objects
The polarization-maintaining performance of body is relatively low, and target object polarization-maintaining performance is higher., can be with after right-circularly polarized light reflects through target object surface
Polarization state is kept well, and the light being reflected back is left circularly polarized light, can enter polarization spectro by overall view ring belt optical system
Component 3.Phase changes pi/2 again after the reverse wave plate 10 by λ/4 of the circularly polarized light of reflection, and polarization direction is compared to initial polarization
Direction is rotated by 90 °, and as s light, when s light passes through polarization beam apparatus 11, can be vertically reflected into image camera 5 and is imaged；
The reflection polarization degree of background object is relatively low, and s components are weaker after the wave plate of λ/4 10, reflexed to by polarization beam apparatus 11
Luminous energy up to image planes is less.Therefore, for the angle of image, target object has higher brightness compared to background object,
Picture contrast is more preferable, it is easy to distinguish.
In the utility model, involved optical element surface needs to plate anti-reflection film, to improve the efficiency of light energy utilization, it is to avoid
Form ghost image and dazzle.
In the utility model, crystallographic axis and the polarization converter 12 of the wave plate 10 of λ/4 shake direction angle at 45 ° thoroughly, make p light twice
It is rotated by 90 ° by direction of vibration after the wave plate 10 of λ/4, as s light.
In the utility model, the light that same object point is sent is refracted into entity from back reflection face 7, then by back reflection
Face 7 and 8 liang of front-reflection face secondary reflection, finally reflect entity from rear transmission plane 9.Light by after overall view ring belt lens 1 at it
Internal or rear forms the virtual image, and the virtual image is reflected by follow-up microscope group 2, images in image camera 5.
In the utility model, overall view ring belt lens 1 are using double glued constructions, and this had both added the achromatic energy of system
Power, while decreasing the aberration correction pressure of follow-up microscope group 2.
In the utility model, image camera 5 can obtain and be regarded greatly using the face battle array CMOS cameras or CCD camera of big picture
The annular image planes of field high-resolution.
In the utility model, lighting source 4 can be according to light of the lighting demand from correspondence spectral characteristic and luminous intensity
Source.In order to prevent the inhomogeneities of light source from influenceing the Illumination Distribution of illumination, the even light such as fly's-eye lens should be used after light source
Element, using cola type of lighting.Polarization converter 12 is made up of polarization beam apparatus (PBS) array, and it is reasonable that each PBS units pass through
Plated film, the transmissive polarization state light wave components parallel with the plane of incidence (p light), and it is multiple anti-by what is occurred between each PBS units
Penetrate and the polarization state light wave components vertical with the plane of incidence (s light) are converted into p light.Thus, the light that lighting source 4 is sent is via polarization
Converter 12, can be converted into p light with the maximum efficiency of light energy utilization, be used as effective illumination light.
In the utility model, the cylindrical field of view of 360 ° of scopes of optical axis can be projected to a two dimension by overall view ring belt lens 1
In annular region.Overall view ring belt lens 1 increase the achromatic ability of system, while also reducing follow-up mirror using double glued constructions
The aberration correction pressure of group 2.Follow-up microscope group 2 is one or more pieces convex lens or concavees lens, for being imaged and correcting all kinds of aberrations.
Embodiment and process of the present utility model are as follows：
Each surface of light path, wherein overall view ring belt lens 1 and follow-up microscope group 2 is built according to the structure of the utility model device
Sphere is used, difficulty of processing is reduced.
Overall view ring belt lens 1 reduce bore using the higher flint material of refractive index as first eyeglass.Follow-up mirror
Group 2 using multiple eyeglasses combination and cemented doublet are come aberration correction and are imaged.
It is 30 °~89 ° now to design a set of available field of view, F-number F=3 common light path overall view ring belt optical imaging device,
Service band is visible region, and reference wavelength is C, d, F light.When optimizing design using optical design software, by many
Weight structure completes illuminator, the optimization design of imaging system.System concrete structure and index path such as Fig. 3 after optimization, never
Parallel rays with visual field entrance is respectively in image planes into a picture.
Consider the imaging system of above-mentioned design, use Pixel size for 5um CCD camera, thus Nyquist frequencies for=
100lp/mm, from fig. 4, it can be seen that modulation transfer function at Nyquist frequencies close to 0.5.
Consider the imaging system of above-mentioned design, in field range, consider by f- θ imaging patterns, distortion is less than 1%.
Above-mentioned embodiment is used for illustrating the utility model, rather than the utility model is limited,
In spirit and scope of the claims of the present utility model, any modifications and changes made to the utility model all fall
Enter protection domain of the present utility model.
Claims (4)
1. the common light path overall view ring belt optical imaging device of a kind of active polarization targets improvement, it is characterised in that including panorama
Annulus polarized illumination system and overall view ring belt polarized imaging system；Overall view ring belt polarized illumination system and overall view ring belt imaging system
Light path, is arranged constituted successively by overall view ring belt lens, follow-up microscope group, polarization spectro component and target surface altogether；Polarization spectro component one
The target surface of side is lighting source, and the target surface of opposite side is image camera.
2. a kind of common light path overall view ring belt optical imaging device of active polarization targets improvement according to claim 1,
Constituted characterized in that, described polarization spectro component is arranged successively by the wave plate of polarization converter, polarization beam apparatus and λ/4；λ/4
Wave plate is close to follow-up microscope group, and polarization converter is close to lighting source.
3. a kind of common light path overall view ring belt optical imaging device of active polarization targets improvement according to claim 1,
Characterized in that, the preceding surface of the overall view ring belt lens includes preceding transmission plane and the front-reflection face positioned at preceding transmission plane center；
Surface includes back reflection face and the rear transmission plane positioned at back reflection face center afterwards.
4. a kind of common light path overall view ring belt optical imaging device of active polarization targets improvement according to claim 1,
Characterized in that, the overall view ring belt lens are using double glued constructions.
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| CN201720046225.XU CN206378636U (en) | 2017-01-16 | 2017-01-16 | The common light path overall view ring belt optical imaging device of active polarization targets improvement |
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| CN201720046225.XU CN206378636U (en) | 2017-01-16 | 2017-01-16 | The common light path overall view ring belt optical imaging device of active polarization targets improvement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106773034A (en) * | 2017-01-16 | 2017-05-31 | 浙江大学 | The common light path overall view ring belt optical imaging device of active polarization targets improvement |
| CN109905585A (en) * | 2019-04-02 | 2019-06-18 | 浙江大学 | A kind of rotary-type underwater polarization camera |
-
2017
- 2017-01-16 CN CN201720046225.XU patent/CN206378636U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106773034A (en) * | 2017-01-16 | 2017-05-31 | 浙江大学 | The common light path overall view ring belt optical imaging device of active polarization targets improvement |
| CN109905585A (en) * | 2019-04-02 | 2019-06-18 | 浙江大学 | A kind of rotary-type underwater polarization camera |
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Effective date of registration: 20220401 Address after: 310000 room 5-906, No. 1818-2, Wenyi West Road, Yuhang street, Yuhang District, Hangzhou City, Zhejiang Province Patentee after: Hangzhou Huanjun Technology Co.,Ltd. Address before: 310058 Yuhang Tang Road, Xihu District, Hangzhou, Zhejiang 866 Patentee before: ZHEJIANG University |