CN106324832B - A method of based on wavefront coded passivation Conformal Optical System aberration - Google Patents
A method of based on wavefront coded passivation Conformal Optical System aberration Download PDFInfo
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- CN106324832B CN106324832B CN201610702182.6A CN201610702182A CN106324832B CN 106324832 B CN106324832 B CN 106324832B CN 201610702182 A CN201610702182 A CN 201610702182A CN 106324832 B CN106324832 B CN 106324832B
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- 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 discloses a kind of methods based on the wavefront coded conformal aberration of passivation, the method comprises the following steps: odd symmetry phase mask plate is added at the diaphragm of Conformal Optical System, the wavefront of optical system is modulated, coded image is formed on the detector, image decoding processing is carried out to coded image by digital filtering means, obtains final clear image.Introducing for wavefront coding technology can be in the case where guaranteeing the luminous flux and imaging resolution of Conformal Optical System, it realizes the purpose of bigger depth of focus, while astigmatism, spherical aberration, color difference and the defocus bring aberration as caused by installation error and temperature change can also be inhibited.Operation of the present invention is simple, and aberration can be passivated in the case where not increasing Conformal Optical System complexity, improves image quality, to improve the acquisition performance and tracking accuracy of target seeker.
Description
Technical field
The present invention relates to a kind of methods using calculating optical come the method that corrects Conformal Optical System aberration, more particularly to
A method of correcting Conformal Optical System aberration using wave-front coding imaging technology.
Background technique
Conformal radome fairing has excellent aerodynamic configuration, is to sacrifice although can improve the aeroperformance of guided missile
Optical seeker image quality is cost.The quality of image quality is directly related to the acquisition performance and tracking accuracy of target seeker.By
In conformal radome fairing under different field of regard, system loses rotational symmetry, to introduce largely as target regards
The dynamic aberration of field variation, it is necessary to which introducing aberration compensation mechanism improves image quality, and the Correction Problemss of optical aberration are urgently to be resolved.
And the method for traditional correction Conformal Optical System aberration has respective limitation: constant aberration corrector pair
It is undesirable in the Conformal Optical System aberration correction effect of heavy caliber, big visual field；Dynamic aberration corrector introduces additional machine
Tool and electronic component cause target seeker weight to increase, volume increases, system structure is complicated, job stability decline.
Summary of the invention
The present invention provides a kind of based on wavefront coded for the deficiency of existing correction Conformal Optical System aberration method
Passivation Conformal Optical System aberration method, introduce aberration compensation mechanism be passivated Conformal Optical System dynamic aberration, improve picture
Matter, to improve the acquisition performance and tracking accuracy of target seeker.Wavefront coded optical system schematic diagram and MTF compare such as Fig. 1 institute
Show.
The purpose of the present invention is what is be achieved through the following technical solutions:
A method of based on the wavefront coded conformal aberration of passivation, include the following steps:
Odd symmetry phase mask plate is added at the diaphragm of Conformal Optical System, the wavefront of optical system is modulated,
Coded image is formed on the detector, and image decoding processing is carried out to coded image by digital filtering means, is obtained final
Clear image.
Odd symmetry phase mask plate is added in the present invention at the diaphragm of Conformal Optical System, carries out to the wavefront of optical system
Modulation, so that the image quality of each visual field reaches unanimity, optical transfer function (OTF) or point spread function (PSF) base
Originally it remains unchanged, to form the minimum fuzzy intermediate image of difference on the detector, and these intermediate images can lead to
The means for crossing digital filtering are recovered to clearly to be ultimately imaged that (decoding process includes the technologies such as liftering, Wiener filtering, is not influenced
Final result of the invention).
The present invention has the advantage that
1, introducing for wavefront coded (WFC) technology can be in the luminous flux and imaging resolution for guaranteeing Conformal Optical System
In the case of, realize the purpose of bigger depth of focus, while astigmatism, spherical aberration, color difference and by installation error and temperature can also be inhibited
Defocus bring aberration caused by degree changes.
2, after phase mask plate is added in Conformal Optical System, the point spread function (PSF) of optical imaging moieties increases, and makes
It is more dispersed to obtain Energy distribution, is not susceptible to saturated phenomenon when receiving intermediate image with CCD, is conducive to measure.
3, (a phase-only mask plate is only placed at optical system diaphragm) easy to operate can not increase altogether
It is passivated aberration in the case where shape optical system complexity, improves image quality, to improve the acquisition performance and tracking accuracy of target seeker.
Detailed description of the invention
Fig. 1 is that wavefront coded optical system schematic diagram and MTF compare, and (a) imaging process, (b) MTF compares；
Fig. 2 is Conformal Optical System structure chart (visual angle: left 0 ° of 30 ° of right side)；
Fig. 3 is (visual angle: left 0 ° of 30 ° of right side) Conformal Optical System MTF；
Fig. 4 is (visual angle: left 0 ° of 30 ° of right side) Conformal Optical System PSF；
Fig. 5 is the Conformal Optical System MTF (visual angle: left 0 ° of 30 ° of right side) after CPM is added；
Fig. 6 is the Conformal Optical System PSF (visual angle: left 0 ° of 30 ° of right side) after CPM is added.
Specific embodiment
Further description of the technical solution of the present invention with reference to the accompanying drawing, and however, it is not limited to this, all to this
Inventive technique scheme is modified or replaced equivalently, and without departing from the spirit and scope of the technical solution of the present invention, should all be covered
Within the protection scope of the present invention.
It is 120mm, the zoom Conformal Optical System conduct that F/# is 2 that a focal length is designed in optical design software CodeV
Initial configuration, it is as shown in Figure 2 that the parameter of Conformal Optical System is shown in Table 1, structure chart: front end be path length than for 1 elliposoidal it is conformal
Radome fairing, two panels immediately after are fixed appliances, and optical system is that Cassegrain's structure adds five lens, respectively by Ge,
ZnS, Ge, ZnS and Si material are made, wherein last a piece of lens are detector window, the rear surface of radome fairing is set as diffraction surfaces.
First reflecting mirror (i.e. the 7th optical surface) of Cassegrain's structure is set as diaphragm, and will be set as substantially eccentric at diaphragm,
Thereafter optical system can be rotated around diaphragm center.The service band of system is 3.7~4.8um, and field of regard is ± 30 °, instantaneously
Visual field is ± 1 °.The MTF of system is as shown in Figure 3, it can be seen that its MTF curve within the scope of its entire scanning field of view all very
It is low, and there are also many zero points.Fig. 4 is the PSF of Conformal Optical System.
1 Conformal Optical System parameter of table
Solution proposed by the present invention is the addition phase-plate at the diaphragm of the Conformal Optical System, and such as phase is covered three times
(usual phase mask plate can be is added a special aspherical mirror to template, can also changing on one side by Traditional optics
Make to be aspherical, select the latter herein), expression formula is such as shown in (1-1):
F (x, y)=α (x3+y3) (1-1)；
In formula: α is phase board parameter, and x, y are that space coordinate is normalized at pupil.
After debugging, α value is 10-6When passivation aberration effect it is best, be added phase-plate after Conformal Optical System MTF, PSF
Respectively as shown in Figure 5,6, it can significantly be found out by Fig. 5,6: be added three times after phase-plate, it is entire for the MTF curve of system
It is significantly improved in targeted scans field range, close to diffraction limit (reaching 0.41 or more at 17lp/mm), and
The PSF of system is also more stable.Coded image is decoded by using digital image processing techniques again, difference can be obtained
The sharply defined image limited under visual field close to diffraction.Therefore, aberration is passivated by the way that phase mask plate is added in Conformal Optical System
Method is very feasible.
Claims (1)
1. a method of based on wavefront coded passivation Conformal Optical System aberration, it is characterised in that the method step is such as
Under:
Designing focal length first is 120mm, the Conformal Optical System that F/# is 2 as initial configuration, the Conformal Optical System
Parameter specifically: dome material ZnS, radome fairing are 3.7 ~ 4.8 μ with a thickness of 3mm, Entry pupil diameters 60mm, operation wavelength
M, field of regard are ± 30 °, and instantaneous field of view is ± 1 °, and front end is the conformal radome fairing of elliposoidal, and radome fairing draw ratio is 1, rectification
Cover bore is 180mm；Two panels immediately after is fixed appliance, and optical system is that Cassegrain's structure adds five lens, five
Piece lens are made of Ge, ZnS, Ge, ZnS and Si material respectively, wherein last a piece of lens are detector window, after radome fairing
Surface is set as diffraction surfaces；First reflecting mirror of Cassegrain's structure, that is, the 7th optical surface are set as diaphragm, and will
It is set as eccentric at diaphragm, optical system thereafter can be rotated around diaphragm center；
Odd symmetry phase mask plate is added at the diaphragm of the Conformal Optical System, the wavefront of optical system is modulated,
Coded image is formed on the detector, and image decoding processing is carried out to coded image by digital filtering means, is obtained final
Clear image；
The phase mask plate expression formula is, whereinFor phase board parameter, value 10-6, x,
Y is that space coordinate is normalized at pupil.
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| KR20200008630A (en) | 2017-05-24 | 2020-01-28 | 더 트러스티스 오브 콜롬비아 유니버시티 인 더 시티 오브 뉴욕 | Broadband achromatic flat optical component by distributed engineered dielectric metasurface |
| KR20200047612A (en) | 2017-08-31 | 2020-05-07 | 메탈렌츠 인코포레이티드 | Transmissive metasurface lens integration |
| US11978752B2 (en) | 2019-07-26 | 2024-05-07 | Metalenz, Inc. | Aperture-metasurface and hybrid refractive-metasurface imaging systems |
| CN112180587B (en) * | 2020-08-27 | 2021-08-10 | 北京大学 | Airborne conformal window aberration correction system |
| US11927769B2 (en) | 2022-03-31 | 2024-03-12 | Metalenz, Inc. | Polarization sorting metasurface microlens array device |
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