Topic
Off-axis optical system
About: Off-axis optical system is a research topic. Over the lifetime, 28 publications have been published within this topic receiving 173 citations.
Papers
TL;DR: Three different alignment algorithms are explained and the problems in DWS method under current experimental situation are discussed, and the alignment result for Korsch type optical system is shown using merit function regression method.
Abstract: The precise alignment of multiple element large optical system is a challenging task. In order to increase the alignment
process efficiency, computer aided alignment methods utilizing Zernike polynomial coefficients have been developed
over the last few decades. Recently, differential wavefront sampling(DWS) algorithm revealed that derivative
information about the wavefront is a very useful to separate wavefront coupling effect between optical elements of the
target system. We compared the alignment performance of the DWS, sensitivity table method and merit function
regression method. Even though DWS showed the best performance in simulation, it revealed weak points in terms of
high sensitivity to the experimental conditions when applied to the real alignment of Korsch type optical system. In this
paper, we explain three different alignment algorithms and discuss the problems in DWS method under current
experimental situation, and show the alignment result for Korsch type optical system using merit function regression
method.
17 citations
Patent•
16 Jul 1998
TL;DR: In this article, a spherical reflector system with one convex reflector and one concave reflector having the same optical axis was proposed. But the reflective surfaces of the two reflectors are opposite each other.
Abstract: The holographic storage and retrieval system according to the present invention comprises one convex reflector and one concave reflector having the same optical axis. The reflective surfaces of the two reflectors are opposite each other. The concave reflector is normally larger than the convex reflector. The holographic storage medium is positioned at the focal surface of the concave reflector. The spherical reflector system according to the present invention has nearly ideal performance off-axis: high bandwidth, low aberration imaging is permitted at a number of radial and axial locations. Thus, multiple SLM/CCD pairs can be placed off-axis to access the same storage medium and implement multiple interconnects.
15 citations
Patent•
1 Mar 1971TL;DR: In this paper, the subject-modulated light reflected from the target surface is directed to a viewing screen by a schlieren optical system including a projection lens and a stop at the focal point of the lens, where a prism is located adjacent the real subject-bearing target surface for rendering the apparent target surface parallel, and the light reflected therefrom orthogonal, to the principal plane of lens and the screen; and for so reducing any color dispersion of the reflected light as to obtain adequate resolution of the image of the subject projected onto the screen.
Abstract: Unmodulated, collimated white light is angularly directed to a target reflecting surface which is deformable to represent a subject, and the subject-modulated light reflected from the target surface is directed to a viewing screen by a schlieren optical system including a projection lens and a stop at the focal point of the lens. A prism is located adjacent the real subject-bearing target surface for rendering the apparent target surface parallel, and the light reflected therefrom orthogonal, to the principal plane of the lens and the screen; and for so reducing any color dispersion of the reflected light as to obtain adequate resolution of the image of the subject projected onto the screen.
13 citations
TL;DR: Experimental results with high precision indicate the proposed algorithm is suitable for complex and asymmetric distortion correction of wide-angle, off-axis optical system.
12 citations
TL;DR: This paper proposes a new optical system reducing a distortion in contrast to a conventional lens without cost, and can get the improvement of MTF, distortion, and lateral color aberrations in comparison to conventional wide angle lens.
Abstract: Recently various types of driver assistance systems have been used for automobiles. In 2008, the U.S Congress passed a law which required that most cars be equipped with devices to warn objects behind the vehicle. Because of that, market of rear view cameras is expected to rise dramatically. Therefore many suppliers try to provide a wide angle camera for car makers. But a high distortion is caused by the wide angle might result in lower image quality. In order to improve the image quality, normally we use an algorithm to correct a distortion. Though we can improve the distorted image by correction algorithm, we must pay more cost to use it. In this paper, we propose a new optical system reducing a distortion in contrast to a conventional lens without cost. In other words, we can see only an area of interest. That is similar to reducing a field of view. Using a new optical system, we can get a less distorted image. In order to view an area of interest, we introduce an off axis optical system having refractive surfaces and reflective surfaces. In this paper, we describe the results of design and, evaluation of an off axis wide angle compact imaging system. In comparison to conventional wide angle lens, we can get the improvement of MTF, distortion, and lateral color aberrations. And we also can reduce a total cost because we don't need the outer apparatus or bracket to mount on the car.
10 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2020 | 1 |
| 2019 | 2 |
| 2018 | 2 |
| 2017 | 2 |
| 2016 | 2 |
| 2015 | 4 |