CN106324832A - Method for passivating aberration of conformal optical system based on wavefront coding - Google Patents
Method for passivating aberration of conformal optical system based on wavefront coding Download PDFInfo
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- CN106324832A CN106324832A CN201610702182.6A CN201610702182A CN106324832A CN 106324832 A CN106324832 A CN 106324832A CN 201610702182 A CN201610702182 A CN 201610702182A CN 106324832 A CN106324832 A CN 106324832A
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- 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 discloses a method for passivating the aberration of a conformal optical system based on wavefront coding. The method includes the following steps that: an odd-symmetry phase mask plate is additionally installed at the diaphragm of the conformal optical system; the wavefront of the optical system is modulated; a coded image is formed on a detector; and image decoding processing is performed on the coded image by means of a digital filtering means, so that a final clear image can be obtained. Since a wavefront coding technique is introduced, a larger focal depth can be realized with the luminous flux and imaging resolution of the conformal optical system ensured, and astigmatism, spherical aberration, chromatic aberration, and aberration caused by defocusing which is further caused by installation error and temperature change can be suppressed. The method of the invention is simple to operate. With the method adopted, under a condition that the complexity of the conformal optical system is not increased, aberration can be passivated, and image quality can be improved, and therefore, the capture performance and tracking precision of a seeker can be improved.
Description
Technical field
The present invention relates to a kind of utilize the method for calculating optical to the method correcting Conformal Optical System aberration, particularly relate to
A kind of utilize wave-front coding imaging technology to the method correcting Conformal Optical System aberration.
Background technology
Conformal trousers has the aerodynamic configuration of excellence, although can improve the aeroperformance of guided missile, but be to sacrifice
Optical seeker image quality is cost.The quality of picture element is directly connected to acquisition performance and the tracking accuracy of target seeker.By
In conformal trousers under different field of regards, system loses rotational symmetry, thus introduces and substantial amounts of regard along with target
The dynamic aberration of field change, it is necessary to introducing aberration compensation mechanism and improve picture element, the Correction Problems of optical aberration is urgently to be resolved hurrily.
And the method for traditional correction Conformal Optical System aberration has a respective limitation: constant aberration corrector pair
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 the increase of target seeker weight, volume increase, system structure complexity, job stability to decline.
Summary of the invention
The present invention is directed to the deficiency of existing correction Conformal Optical System aberration method, it is provided that a kind of based on wavefront coded
Passivation Conformal Optical System aberration method, introduce aberration compensation mechanism passivation Conformal Optical System dynamic aberration, improve picture
Matter, thus improve acquisition performance and the tracking accuracy of target seeker.Wavefront coded optical system schematic diagram and MTF compare such as Fig. 1 institute
Show.
It is an object of the invention to be achieved through the following technical solutions:
A kind of based on the wavefront coded method being passivated conformal aberration, comprise the steps:
At the diaphragm of Conformal Optical System, add odd symmetry phase mask plate, the wavefront of optical system be modulated,
Form coded image on the detector, by digital filtering means, coded image is carried out picture decoding process, obtain final
Picture rich in detail.
The present invention adds odd symmetry phase mask plate at the diaphragm of Conformal Optical System, carries out the wavefront of optical system
Modulation so that the image quality of each visual field reaches unanimity, its optical transfer function (OTF) or point spread function (PSF) base
This holding is constant, thus forms the fuzzy intermediate image that difference is minimum on the detector, and these intermediate images can lead to
Cross the means of digital filtering and be recovered to be ultimately imaged clearly that (decoding process includes the technology such as liftering, Wiener filtering, does not affects
The final result of the present invention).
Present invention have the advantage that
1, the introducing of wavefront coded (WFC) technology can ensure the luminous flux of Conformal Optical System and imaging resolution
In the case of, it is achieved the purpose of bigger depth of focus, astigmatism, spherical aberration, aberration and by alignment error and temperature can also be inhibited simultaneously
The aberration that the out of focus that degree change causes is brought.
2, after Conformal Optical System adds phase mask plate, the point spread function (PSF) of optical imaging moieties increases, and makes
Obtain Energy distribution more to disperse, when accepting intermediate image with CCD, be not susceptible to saturated phenomenon, be conducive to measuring.
3, simple to operate to (at optical system diaphragm, only placing a phase-only mask plate), can not increase altogether
It is passivated aberration in the case of shape optical system complexity, improves picture element, thus improve acquisition performance and the tracking accuracy of target seeker.
Accompanying drawing explanation
Fig. 1 is wavefront coded optical system schematic diagram and MTF compares, and (a) imaging process, (b) MTF compares；
Fig. 2 is Conformal Optical System structure chart (visual angle: 30 ° of left 0 ° of right side)；
Fig. 3 is Conformal Optical System MTF (visual angle: 30 ° of left 0 ° of right side)；
Fig. 4 is Conformal Optical System PSF (visual angle: 30 ° of left 0 ° of right side)；
Fig. 5 is the Conformal Optical System MTF (visual angle: 30 ° of left 0 ° of right side) after adding CPM；
Fig. 6 is the Conformal Optical System PSF (visual angle: 30 ° of left 0 ° of right side) after adding CPM.
Detailed description of the invention
Below in conjunction with the accompanying drawings technical scheme is further described, but is not limited thereto, every to this
Inventive technique scheme is modified or equivalent, without deviating from the spirit and scope of technical solution of the present invention, all should contain
In protection scope of the present invention.
Optical design software CodeV designs focal length be 120mm, F/# be the zoom Conformal Optical System conduct of 2
Initiating structure, the parameter of Conformal Optical System is shown in Table 1, structure chart as shown in Figure 2: front end be fineness ratio be 1 elliposoidal conformal
Trousers, two panels immediately after is fixed appliance, and optical system is that Cassegrain's structure adds five lens, respectively by Ge,
ZnS, Ge, ZnS and Si material is made, and the most last a piece of lens are detector window, and the rear surface of trousers is set to diffraction surfaces.
First reflecting mirror (i.e. the 7th optical surface) of Cassegrain's structure is set to diaphragm, and substantially eccentric by being set at diaphragm,
Thereafter optical system can be around diaphragm central rotation.The service band of system is 3.7～4.8um, and field of regard is ± 30 °, instantaneous
Visual field is ± 1 °.The MTF of system is as shown in Figure 3, it can be seen that its MTF curve in the range of its whole scanning field of view the most very
Low, and the most a lot of zero point.Fig. 4 is the PSF of Conformal Optical System.
Table 1 Conformal Optical System parameter
The solution that the present invention proposes is addition phase-plate at the diaphragm of this Conformal Optical System, and such as three times, phase place is covered
(usual phase mask plate can be to add a special aspherical mirror to template, it is also possible to the one side of Traditional optics is changed
Make as aspheric surface, select the latter herein), its expression formula is as shown in (1-1):
F (x, y)=α (x3+y3) (1-1)；
In formula: α is phase-plate parameter, x, y are normalization space coordinates at pupil.
Being adapted, α value is 10-6Time passivation aberration effect best, add MTF, PSF of Conformal Optical System after phase-plate
Respectively the most as shown in Figure 5,6, by Fig. 5,6 can significantly find out: after adding three phase-plates, it is whole for the MTF curve of system
It is significantly improved in targeted scans field range, close to diffraction limit (all reaching more than 0.41 at 17lp/mm), and
The PSF of system is the most more stable.Again by using digital image processing techniques that coded image is decoded, just available difference
Close to the sharply defined image of diffraction-limited under visual field.Therefore, it is passivated aberration by addition phase mask plate in Conformal Optical System
Method is the most feasible.
Claims (2)
1. a method based on the wavefront coded conformal aberration of passivation, it is characterised in that described method step is as follows:
At the diaphragm of Conformal Optical System, add odd symmetry phase mask plate, the wavefront of optical system is modulated, visiting
Surveying and form coded image on device, by digital filtering means, coded image is carried out picture decoding process, it is final clear to obtain
Image.
The most according to claim 1 based on the wavefront coded method being passivated conformal aberration, it is characterised in that described phase place
Mask plate is odd symmetry phase mask plate.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10795168B2 (en) | 2017-08-31 | 2020-10-06 | Metalenz, Inc. | Transmissive metasurface lens integration |
| CN112180587A (en) * | 2020-08-27 | 2021-01-05 | 北京大学 | Airborne conformal window aberration correction system |
| US11906698B2 (en) | 2017-05-24 | 2024-02-20 | The Trustees Of Columbia University In The City Of New York | Broadband achromatic flat optical components by dispersion-engineered dielectric metasurfaces |
| US11927769B2 (en) | 2022-03-31 | 2024-03-12 | Metalenz, Inc. | Polarization sorting metasurface microlens array device |
| US11978752B2 (en) | 2019-07-26 | 2024-05-07 | Metalenz, Inc. | Aperture-metasurface and hybrid refractive-metasurface imaging systems |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11906698B2 (en) | 2017-05-24 | 2024-02-20 | The Trustees Of Columbia University In The City Of New York | Broadband achromatic flat optical components by dispersion-engineered dielectric metasurfaces |
| US10795168B2 (en) | 2017-08-31 | 2020-10-06 | Metalenz, Inc. | Transmissive metasurface lens integration |
| US11579456B2 (en) | 2017-08-31 | 2023-02-14 | Metalenz, Inc. | Transmissive metasurface lens integration |
| US11988844B2 (en) | 2017-08-31 | 2024-05-21 | Metalenz, Inc. | Transmissive metasurface lens integration |
| US11978752B2 (en) | 2019-07-26 | 2024-05-07 | Metalenz, Inc. | Aperture-metasurface and hybrid refractive-metasurface imaging systems |
| CN112180587A (en) * | 2020-08-27 | 2021-01-05 | 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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