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design of compact fisheye lens with slope-constrained Q-type aspheres

Design of compact fisheye lens with slope-constrained Q-type...

引用

conference on current developments in lens design and optical engineering XIV

作者： Xu, Chen Cheng, Dewen Song, Weitao Wang, Yongtian Wang, Qingfeng Beijing Inst Technol Sch Optoelect Beijing 100081 Peoples R China

ISBN: (纸本)9780819496911

Two types of fisheye lenses for automobile navigation are designed with slope-constrained Q-type aspheres. Special requirements have been considered in the design process, and Q-type surfaces are introduced by converted from other kinds of aspheric description with only coefficients of low-order terms retained. A possible problem of imaging the first surface onto the sensor has also been analyzed. As a result, as for the six-element fisheye lens, MTF is greater than 0.3 at 45lp/mm, f-theta distortion is less than 0.03 when the focal length is calibrated, field of view is 230 degrees and full field relative illumination is greater than 0.4. For the four-element fisheye lens, MTF is greater than 0.4 at 45lp/mm, f-theta distortion is less than 0.16, field of view is 190 degrees and full field relative illumination is greater than 0.6. The design results show that the Q-type surfaces employed in fisheye lenses can make the system more compact, lightweighted and easier to manufacture.

关键词： fisheye lens Q-type asphere distortion evaluation tolerance analysis image quality analysis

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Fisheye lens designs and their relative performance

Fisheye lens designs and their relative performance

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conference on current developments in lens design and optical Systems engineering

作者： Kumler, J Bauer, M Coastal Opt Syst W Palm Beach FL 33407 USA

ISBN: (纸本)0819437387

New panoramic and immersive digital imaging developments have generated increased interest in high performance fisheye camera lenses suitable for 35 mm single lens reflex (SLR) cameras. Special concerns for such applications are the uniformity of illumination and radial image mapping. Because two hemispherical images are digitally stitched together to form a complete 360-degree x 180-degree image, the performance of the lens at the 90 degree (preferably more than 90 degree) edge of the fisheye image is just as important as the center of the image. Lateral color, high order distortion (edge compression) and severe drop-off of illumination at the full field become obvious image defects and cause seams in the immersive image. Fisheye lens designs have widely varying relative illumination and distortion across the hemispherical field of view of the lens. After describing the contributing factors to relative illumination, we survey a collection of fisheye designs and compare their illumination performance, radial mapping and lateral color. A new method of measuring relative illumination and radial mapping in the laboratory is described and results on commercially available fish-eye lenses are presented.

关键词： fisheye lenses optical design relative illumination distortion testing

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Assessment, optimization, and tolerancing methods for visual instruments

Assessment, optimization, and tolerancing methods for visual...

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conference on current developments in lens design and optical Systems engineering

作者： Deslis, A Mouroulis, P Davidson Optron Inc W Covina CA 91790 USA

ISBN: (纸本)0819437387

A strategy for optimizing both the on-axis and the off-axis performance of coherently (directly) coupled visual instruments is presented. The strategy draws on the recently published body of data regarding the influence of various individual Seidel aberration and aberration combinations on subjective contrast sensitivity and resolution tasks, as well as studies on the correlation between subjective image quality and objective instrumental figures of merit. An MTF-based metric allows both optimization and tolerancing to be performed in a coherent manner that is based on experimental results of the effects of aberrations.

关键词： optimization visual systems optical design tolerancing MTF

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Landsat-swath Imaging Spectrometer design 16

Landsat-swath Imaging Spectrometer Design

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conference on current developments in lens design and optical engineering XVI

作者： Mouroulis, Pantazis Green, Robert O. Van Gorp, Byron Moore, Lori Wilson, Daniel W. Bender, Holly A. CALTECH Jet Prop Lab Pasadena CA 91109 USA

ISBN: (纸本)9781628417449

We describe the design of a high-throughput pushbroom imaging spectrometer and telescope system that is capable of Landsat swath and resolution while providing better than 10 nm per pixel spectral resolution. The design is based on a 3200 x 480 element x 18 mu m pixel size focal plane array, two of which are utilized to cover the full swath. At an optical speed of F/1.8, the system is the fastest proposed to date to our knowledge. The utilization of only two spectrometer modules fed from the same telescope reduces system complexity while providing a solution within achievable detector technology. Predictions of complete system response are shown. Also, it is shown that detailed ghost analysis is a requirement for this type of spectrometer and forms an essential part of a complete design.

关键词： Imaging spectrometer Landsat Dyson spectrometer

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optical design and analysis of a polarimeter for space applications

Optical design and analysis of a polarimeter for space appli...

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conference on current developments in lens design and optical engineering V

作者： Deslis, A Petroy, S Kampe, T Ball Aerosp & Technol Corp Boulder CO 80301 USA

ISBN: (纸本)0819454613

Satellite-based remote sensing offers the best opportunity for studying the properties of atmospheric aerosols and their radiative effects on the global scale over extended periods Tropospheric aerosols represent the largest uncertainty in predicting the radiative forcing of climate (IPCC, 2001). A key question is whether atmospheric aerosols contribute to warming or cool the climate system. Since the sign of direct radiative forcing is controlled by the ability of aerosol particles to absorb light, the information on the single scattering albedo of different aerosol types and its variations with aerosol lifecycles is clearly very desirable. Furthermore, the wavelength-dependent values of single scattering albedo from the UV to IR are important in retrieving aerosol optical depth from satellites passive remote sensing and for climate modeling. We describe the design of a space-borne polarimeter that was derived from the key science requirements. The performance of this candidate polarimeter, operating in the UV/VIS/NIR spectral regions, is described. The optical design form and various optical performance parameters, including transmittance calculations of the polarimeter's spectral channels showing the "leakage" of polarization states, as well as the degree of polarization as function of wavelength and field of view are presented for the various wavelength regions. An overview of the instrument performance and driving operational parameters is presented.

关键词： polarimeter optical design atmospheric aerosols polarization

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The design of microscopic system using zoom structure with a fixed magnification and the independency on the variation of object distance

The design of microscopic system using zoom structure with a...

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conference on current developments in lens design and optical engineering V

作者： Ryu, JM Jo, JH Jung, JH Chun, YS Kang, GM Hannam Univ Sch Nat Sci Taejon 306791 South Korea

ISBN: (纸本)0819454613

The multi-configurative microscopic system for inspecting the wire-bonding of reed frame is designed. Object rays is nearly collimated by a objective lens group which is a common lens group of x2 and x6 imaging lens systems and is splitted by two beam-splitters composed of a penta-prism and a refracting prism. And object rays started from the central region and the boundary region(reed frame region) on semiconductor chip(that is, the object) are imaged at the two different imaging planes by x2 and x6 imaging lens groups, respectively. The x6 imaging lens system with a constant object distance and a constant magnification is well designed by general imaging optics system design method. However, since the depth of wire structure on the reed frame has about +/-3 mm, in order to observe by a constant magnification and at a fixed imaging plane without the dependency on the variation of objective distance generated by the depth of wire structure on the reed frame, the imaging lens system is composed of two separated groups, which should be moved along nonlinear locus like mechanically compensated zoom lenses. The nonlinear equations for zoom locus are derived by using the Gaussian bracket. Refraction powers and positions of each groups are numerically determined by solving the equations, and initial design data for each groups is obtained by using Seidel third order aberration theory. The optimization technique is finally utilized to obtain this multi-configurative microscopic system.

关键词： lens design equivalent lens imaging system microscopic system multi-configurative system

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Linear decomposition of the optical transfer function for annular pupils 18

Linear decomposition of the optical transfer function for an...

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conference on current developments in lens design and optical engineering XviiI

作者： Schwiegerling, Jim Univ Arizona Coll Opt Sci 1630 E Univ Blvd Tucson AZ 85721 USA

ISBN: (纸本)9781510612082;9781510612075

A technique for decomposing the optical Transfer Function (OTF) into a novel set of basis functions has been developed. The decomposition provides insight into the performance of optical systems containing both wavefront error and apodization, as well as the interactions between the various components of the pupil function. Previously, this technique has been applied to systems with circular pupils with both uniform illumination and Gaussian apodization. Here, systems with annular pupils are explored. In cases of annular pupil with simple defocus, analytic expressions for the OTF decomposition coefficients can be calculated. The annular case is not only applicable to optical systems with central obscurations, but the technique can be extended to systems with multiple ring structures. The ring structures can have constant area as is often found in zone plates and diffractive lenses or the rings can have arbitrary areas. Analytic expressions for the OTF decomposition coefficients again can be determined for ring structures with constant and quadratic phase variations. The OTF decomposition provides a general tool to analyze and compare a diverse set of optical systems.

关键词： optical Transfer Function Modulation Transfer Function Annular Pupils Mathematics Decomposition

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Aspherical optics design for minimal spherical aberration in vision correction of human eyes

Aspherical optics design for minimal spherical aberration in...

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conference on current developments in lens design and optical engineering IX

作者： Jiang, Min-shan Lin, J. T. Zhou, Chuan-qing Ren, Qiu-shi Shanghai Jiao Tong Univ Inst Laser Med & Biophoton Shanghai Peoples R China Natl Taiwan Univ Inst Electroopt Taipei Taiwan

ISBN: (纸本)9780819472809

Using raytracing method (ZEMAX program), the reduction of SA of the whole human eye may be reduced via the combined effects of asphericity (Q) and the ratio of the front and back surface of an IOL. The overall SA for best image quality may be defined by Q* when the image position off axis is reduced to that of the paraxial. Our calculations show the following general features: (1) For a give Q value, the influence on the SA is proportional to the surface power;(2) for minimal whole eye SA, negative Q is needed in IOL;(3) for a given IOL power, the Q* is smaller when the front surface has a smaller power. All above features derived from numerical raytracing method are consistent with analytic formulas.

关键词： Spherical aberration raytracing huamn eye aspherical lens Q value LASIK surgery

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A water-polydimethylsiloxane liquid lens for variable focus experiments in an undergraduate laboratory 20

A water-polydimethylsiloxane liquid lens for variable focus ...

引用

conference on current developments in lens design and optical engineering XX

作者： Anonuevo, Johannes F. Guerrero, Raphael A. Ateneo Manila Univ Loyola Hts Sch Sci & Engn Dept Phys Quezon City 1108 Philippines

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

Fluidic lenses offer tunability and flexibility that are not available with conventional solid lenses. The development of a variable focus lens has the potential for replacing bulky optical systems and allows the miniaturization of imaging optics used in digital cameras and mobile phone cameras. In this paper, a liquid lens platform for use in an undergraduate laboratory setting is presented. A variable lens is prepared by injecting water into bulk polydimethylsiloxane (PDMS) that remains uncured in its fluid state. We report the tunable focusing ability of this simple liquid lens system and analyze the change in focal length as a function of injected water volume. The water-PDMS interface acts as a diverging lens, in agreement with ray tracing analysis based on curvature and refractive indices. Variable focal lengths are measured with an optical set-up employing a helium-neon laser and a solid converging lens with focal length = 2.5 cm. By increasing the water volume from 0.05 to 0.30 ml, we are able to tune the focal length from -6.5 mm to -10.6 mm. lens geometry remains spherical as the curvature of the lens changes with the addition of water. Our experiments coincide with a simple theoretical framework for a thick lens immersed in a medium. The water-PDMS lens is a promising component of basic and advanced experiments in an undergraduate optics course.

关键词： Liquid lens PDMS Variable focus

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Cryogenic optical design and testing of the Focal Plane Opto-Mechanical Assembly for the Tropospheric Emission Spectrometer

Cryogenic optical design and testing of the Focal Plane Opto...

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conference on current developments in lens design and optical Systems engineering

作者： Crowther, BG Elwell, JD Anderson, RE Space Dynam Lab Logan UT 84341 USA

ISBN: (纸本)0819437387

The Tropospheric Emission Spectrometer (TES) is one of the instruments slated to fly on the EOS Aura satellite in 2003. TES is a Fourier transform spectrometer designed to measure the concentration of various tropospheric chemical species. The Focal Plane Opto-Mechanical Assemblies (FPOMAs) are situated at the end of the TES optical train and are comprised of cryogenic telescopes, reimaging optics, and focal planes. We present the cryogenic optical design of the FPOMA units and discuss optimization parameters and predicted performance. We present measured performance data and compare it with the predicted performance.

关键词： Tropospheric Emission Spectrometer TES Focal Plane Opto-Mechanical Assembly FPOMA optical design cryogenic performance

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