CN105022165A - Optical imaging system based on anaberration of wavefront coding technology - Google Patents
Optical imaging system based on anaberration of wavefront coding technology Download PDFInfo
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- CN105022165A CN105022165A CN201510374721.3A CN201510374721A CN105022165A CN 105022165 A CN105022165 A CN 105022165A CN 201510374721 A CN201510374721 A CN 201510374721A CN 105022165 A CN105022165 A CN 105022165A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
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Abstract
The invention relates to an optical imaging system based on anaberration of wavefront coding technology. The optical imaging system comprises a front transmission type optical system (1), a rear transmission type optical system (2), a wavefront coding element (3), a focal plane system (4) and an image recovery system (5), wherein the wavefront coding element (3) is arranged at a diaphragm position of the front transmission type optical system (1) and the rear transmission type optical system (2), the focal plane system (4) is arranged at the focal plane of the front transmission type optical system (1) and the rear transmission type optical system (2), and the wavefront coding element (3) includes a circular lens. The optical imaging system of the invention overcomes disadvantages of the anaberration methods of present optical systems, and the wavefront coding element and the image recovery algorithm are used to effectively eliminate the aberration, field curvature and distortion of the visual field, simplify the structure of the optical imaging system, and reduce the size of the optical imaging system.
Description
Technical field
The present invention relates to optical image technology field and optical detection system, particularly a kind of optical imaging system based on wavefront coding technology anaberration.
Background technology
For imaging system, for make optical system possess low aberration, high picture element characteristic to meet request for utilization, except for except the lens combination of imaging in optical system, also need to increase multiple lens for correcting all kinds of aberration.The method of conventional increase lens combination anaberration, add the weight of optical system, structure complexity and processing resetting difficulty on the one hand, reduce the stability of optical system, restriction on the other hand owing to requiring by optical imagery system performance, configuration, environment for use etc., the method increasing lens combination aberration correction can not be applicable to all optical system forms, has its limitation in the application.
Therefore, effectively can eliminate the aberration of optical system, do not increase again too much anaberration lens combination, avoid because lens combination too much introduces new problem (as processing resetting difficulty, volume weight, structural stability, environmental suitability etc.) in engineering development and practical application, and the good optical system eliminating aberration method of versatility has important application demand in the manufacturing and designing of optical imaging system.
Summary of the invention
The technical matters that the present invention solves is: the deficiency overcoming optical system eliminating aberration method in prior art, provide and be a kind ofly applicable to transmission-type, the anaberration of transmission combined type imaging system of turning back, the aberration such as aberration, the curvature of field, visual field distortion that effectively can eliminate optical system, and the structure of optical imaging system and the optical imaging system based on wavefront coding technology anaberration of volume can be simplified.
Technical solution of the present invention is: a kind of optical imaging system based on wavefront coding technology anaberration, comprises front group of transmission type optical system, rear group of transmission type optical system, wavefront coding element, focal plane system and image restoration system, wherein
Wavefront coding element is placed in front group of transmission type optical system, the diaphragm place of optical system of rear group of transmission type optical system composition or equivalent stop place, the focal plane place of the optical system that focal plane system is placed in front group of transmission type optical system, rear group of transmission type optical system forms; Transmission is there is after front group of transmission type optical system receives the extraneous imaging light injected, and deliver to wavefront coding element, after wavefront coding element carries out transmission to imaging light, modulate the transmission path of imaging light and delivered to rear group of transmission type optical system, rear group of transmission type optical system carries out transmission to imaging light, then focal plane system is delivered to, focal plane system delivers to image restoration system after imaging light is converted to electric signal, and image restoration system uses the transmission path of Image Restoration Algorithm to imaging light corresponding to electric signal carry out demodulation and be shown as picture; Described wavefront coding element is round lens, and one end shape is when in the optical transfer function corresponding to optical system of front group of transmission type optical system, rear group of transmission type optical system composition, aberration is suppressed, the wavefront distribution shape at pupil place.
The adjusting point spread function that recovery core in the Image Restoration Algorithm that described image restoration system uses is optical imaging system; The adjusting point spread function of described optical imaging system
wherein, f
1for the eyeball spread function of optical imaging system, f
2for the mathematical point spread function of optical imaging system, a span is [0,60].
The material of described round lens is glass or resin.
The present invention's advantage is compared with prior art:
(1) present system adopts monolithic wavefront coding element effectively can realize the correction of the aberration such as aberration, the curvature of field, compared with prior art, optical element quantity obviously reduces, alleviate the weight of optical imaging system, reduce the resetting difficulty of optical imaging system, improve environmental suitability, with the obvious advantage in transmission-type, transmission combined type optical imaging system of turning back application;
(2) image processing algorithm is applied in imaging by present system, restored by later image and eliminate the modulation of wavefront coding element to imaging light, obtain aberrationless picture rich in detail, compared with prior art, replaced the anaberration function of conventional lenses group by application image Processing Algorithm, reduce further the cost of optical imaging system, improve system reliability.
(3) in present system, the installation site of wavefront coding element can process according to reality the complexity debug, and in diaphragm or equivalent stop two positions, select one flexibly, highly versatile, flexibility ratio is high, reduces design, processing resetting difficulty.
Accompanying drawing explanation
Fig. 1 is a kind of optical imaging system structural drawing based on wavefront coding technology anaberration of the present invention;
Fig. 2 is the aberration contrast that present system applies forward and backward imaging system;
Fig. 3 is the curvature of field consistance contrast that present system applies forward and backward imaging system;
Fig. 4 be present system apply forward and backward imaging system out of focus-100 μm ,-50 μm, 0 μm, 50 μm, 100 μm time different visual field point range figure consistance contrast (out of focus, the contrast of visual field distortion aberration).
Embodiment
The present invention proposes a kind of optical imaging system based on wavefront coding technology anaberration, group transmission type optical system 1 before comprising as shown in Figure 1, rear group of transmission type optical system 2, wavefront coding element 3, focal plane system 4 and image restoration system 5, wherein, front group of transmission type optical system 1 and rear group of transmission type optical system 2 are the initial configuration of optical imaging system, the larger aberration of general existence, group transmission type optical system 1 before wavefront coding element 3 is placed in, the diaphragm of the optical system of rear group of transmission type optical system 2 composition or equivalent stop place (Figure 1 shows that diaphragm place), group transmission type optical system 1 before focal plane system 4 is placed in, the focal plane place of the optical system of rear group of transmission type optical system 2 composition, image restoration system 5 can be developed to software package and run on computers, also respective handling algorithm can be embedded in focal plane system 4, wavefront coding element 3 and image restoration system 5 are aberration-free system of the present invention, for eliminating the aberration of initial optical imaging system (front group of transmission type optical system 1 and rear group of transmission type optical system 2).
Extraneous incident imaging light premenstrual group of transmission type optical system 1 receives and transmission, deliver to wavefront coding element 3, the transmission path of wavefront coding element 3 pairs of imaging light delivers to rear group of transmission type optical system 2 after modulating, focal plane system 4 is delivered to after rear group of transmission type optical system 2 pairs of imaging light carry out transmission, imaging signal is converted to electric signal by focal plane system 4, record and deliver to image restoration system 5 after storing, image restoration system 5 utilizes Image Restoration Algorithm that the imaging light transmission path after modulation corresponding to electric signal is carried out to demodulation and shows, wherein, the modulating action of wavefront coding element 3 pairs of imaging light transmission paths is recorded by focal plane system 4 and stores, the electric signal that modulating action shows as record is blurred picture, the demodulation effect of image restoration system 5 pairs of electric signal shows as blurred picture and is reduced to picture rich in detail, imaging light is final after system to be generated after aberration correction, the uniform picture rich in detail of each visual field picture element.
In present system embodiment, wavefront coding element 3 is round lens, one face type is equal to conventional lenses face type, the wavefront distribution shape at pupil place when aberration is suppressed in the optical transfer function that the optical system that other end shape is front group of transmission type optical system 1, rear group of transmission type optical system 2 forms is corresponding;
In present system embodiment, the recovery core in Image Restoration Algorithm is the adjusting point spread function of imaging system, wherein imaging system adjusting point spread function
wherein, f
1for the eyeball spread function of imaging system, f
2for the mathematical point spread function of front group of transmission type optical system 1, rear group of transmission type optical system 2, wavefront coding element 3 and focal plane system 4, calculated by the Pixel Dimensions of ZEMAX software according to front group of transmission type optical system 1, rear group of transmission type optical system 2, the configuration of wavefront coding element 3, the optical characteristics of material and focal plane system 4, a span is [0,60].
In present system embodiment, lens 6 in front group of transmission type optical system 1 and lens 7 are conventional imaging lens, high antireflection film can be plated in surface, lens 8 in rear group of transmission type optical system 2, negative-power lenses 9 and positive power lens 10 is conventional imaging lens, can plate anti-reflection film with air contact surfaces.
Below in conjunction with example, a kind of optical imaging system based on wavefront coding technology anaberration of the present invention is described in detail, as Fig. 2 (a) is depicted as the chromatic aberration correction effect of the front optical imaging system of present system application, as Fig. 2 (b) is depicted as the chromatic aberration correction effect of the rear optical imaging system of present system application, can find out that present system effectively can eliminate the aberration of optical system.
As Fig. 3 (a) is depicted as the curvature of field calibration result of the front optical imaging system of present system application, as Fig. 3 (b) is depicted as the curvature of field calibration result of the rear optical imaging system of present system application, can find out that present system effectively can eliminate the curvature of field of optical system.
As Fig. 4 (a) be depicted as present system application before optical imaging system out of focus-100 μm ,-50 μm, 0 μm, 50 μm, 100 μm time different visual field point range figure consistance, be depicted as present system application as Fig. 4 (b) after optical imaging system out of focus-100 μm ,-50 μm, 0 μm, 50 μm, 100 μm time different visual field point range figure consistance, can find out that present system effectively can improve out of focus aberration and the visual field distortion of optical imaging system, and improve the imaging consistency of each visual field.
The content be not described in detail in instructions of the present invention belongs to the known technology of those skilled in the art.
Claims (3)
1. the optical imaging system based on wavefront coding technology anaberration, it is characterized in that comprising front group of transmission type optical system (1), rear group of transmission type optical system (2), wavefront coding element (3), focal plane system (4) and image restoration system (5), wherein
The diaphragm place of the optical system that wavefront coding element (3) is placed in front group of transmission type optical system (1), rear group of transmission type optical system (2) forms or equivalent stop place, the focal plane place of the optical system that focal plane system (4) is placed in front group of transmission type optical system (1), rear group of transmission type optical system (2) forms, transmission is there is after front group of transmission type optical system (1) receives the extraneous imaging light injected, and deliver to wavefront coding element (3), after wavefront coding element (3) carries out transmission to imaging light, modulate the transmission path of imaging light and delivered to rear group of transmission type optical system (2), rear group of transmission type optical system (2) carries out transmission to imaging light, then focal plane system (4) is delivered to, focal plane system (4) delivers to image restoration system (5) after imaging light is converted to electric signal, image restoration system (5) uses the transmission path of Image Restoration Algorithm to imaging light corresponding to electric signal carry out demodulation and be shown as picture, described wavefront coding element (3) is round lens, when in the optical transfer function that the optical system that one end shape is front group of transmission type optical system (1), rear group of transmission type optical system (2) forms is corresponding, aberration is suppressed, the wavefront distribution shape at pupil place.
2. a kind of optical imaging system based on wavefront coding technology anaberration according to claim 1, is characterized in that: the adjusting point spread function that the recovery core in the Image Restoration Algorithm that described image restoration system (5) uses is optical imaging system; The adjusting point spread function of described optical imaging system
wherein, f
1for the eyeball spread function of optical imaging system, f
2for the mathematical point spread function of optical imaging system, a span is [0,60].
3. a kind of optical imaging system based on wavefront coding technology anaberration according to claim 1, is characterized in that: described round lens material is glass or resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510374721.3A CN105022165A (en) | 2015-06-30 | 2015-06-30 | Optical imaging system based on anaberration of wavefront coding technology |
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| CN201510374721.3A CN105022165A (en) | 2015-06-30 | 2015-06-30 | Optical imaging system based on anaberration of wavefront coding technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106972921A (en) * | 2017-01-03 | 2017-07-21 | 北京理工大学 | The asymmetrical optical information safety system of double optical key is combined based on wavefront sensing |
| CN107260123A (en) * | 2017-06-09 | 2017-10-20 | 苏州大学 | Mobile phone external eye ground imaging lens and eye ground image acquisition method |
-
2015
- 2015-06-30 CN CN201510374721.3A patent/CN105022165A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 黄薇薇: "波前编码技术理论及其应用", 《中国优秀硕士学位论文全文数据库信息科技辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106972921A (en) * | 2017-01-03 | 2017-07-21 | 北京理工大学 | The asymmetrical optical information safety system of double optical key is combined based on wavefront sensing |
| CN106972921B (en) * | 2017-01-03 | 2020-07-28 | 北京理工大学 | Asymmetric optical information security system based on wave-front sensing and double optical keys |
| CN107260123A (en) * | 2017-06-09 | 2017-10-20 | 苏州大学 | Mobile phone external eye ground imaging lens and eye ground image acquisition method |
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Application publication date: 20151104 |