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lens design and system optimization for foveated imaging

Lens design and system optimization for foveated imaging

引用

conference on current developments in lens design and optical engineering IX

作者： Curatu, George Harvey, James E. LightPath Technol 2603 Challenger Tech Ct Orlando FL 32826 USA Univ Cent Florida Orlando FL 32816 USA

ISBN: (纸本)9780819472809

Foveated imaging addresses the need for compact wide-angle imagers capable of high-resolution and compressed data transmission. The principle behind foveated imaging is to cover a wide field-of-view (FOV) with a relatively simple and compact low-resolution lens, and use a liquid crystal spatial light modulator (SLM) to correct wavefront aberrations at any selected field point. The SLM correction provides a high-resolution fovea that can be actively moved anywhere within the FOV. While most research has focused so far mainly on SLM performance, the general trend being to increase SLM resolution and modulation depth, the actual lens design and system optimization aspects were often neglected. In this paper, we propose a wide-angle lens design intended for foveated imaging applications, and discuss typical tradeoffs. Taking this design as an example, we present a method to estimate the smallest SLM resolution required to correct the wavefront error effectively, showing that with the appropriate design, this resolution can be reduced up to 10 times compared to current designs. Increasing the SLM resolution beyond this point and increasing the modulation depth above one wavelength is not necessary, and will actually reduce the performance of the imaging system. We also demonstrate the importance of fabrication tolerances, and we propose a method to calibrate the SLM in order to cancel out all additional wavefront aberrations introduced by fabrication and assembly errors.

关键词： foveated imaging adaptive optics wide-angle lenses aberration compensation spatial light modulators liquid crystal devices

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Development and optical testing of the camera, hand lens, and microscope probe with scannable laser spectroscopy (CHAMP-SLS)

Development and optical testing of the camera, hand lens, an...

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conference on current developments in lens design and optical engineering IX

作者： Mungas, Greg S. Guersel, Yekta Sepulveda, Cesar A. Anderson, Mark La Baw, Clayton Johnson, Kenneth R. Deans, Matthew Beegle, Luther Boynton, John CALTECH Jet Prop Lab 4800 Oak Grove Dr Pasadena CA 91109 USA NASA Ames Res Ctr Moffett Field CA 94035 USA

ISBN: (纸本)9780819472809

Conducting high resolution field microscopy with coupled laser spectroscopy that can be used to selectively analyze the surface chemistry of individual pixels in a scene is an enabling capability for next generation robotic and manned spaceflight missions, civil, and military applications. In the laboratory, we use a range of imaging and surface preparation tools that provide us with in-focus images, context imaging for identifying features that we want to investigate at high magnification, and surface-optical coupling that allows us to apply optical spectroscopic analysis techniques for analyzing surface chemistry particularly at high magnifications. The camera, handlens, and microscope probe with scannable laser spectroscopy (CHAMP-SLS) is an imaging/spectroscopy instrument capable of imaging continuously from infinity down to high resolution microscopy (resolution of similar to 1 micron/pixel in a final camera format), the closer CHAMP-SLS is placed to a feature, the higher the resultant magnification. At hand lens to microscopic magnifications, the imaged scene can be selectively interrogated with point spectroscopic techniques such as Raman spectroscopy, microscopic Laser Induced Breakdown Spectroscopy (micro-LIBS), laser ablation mass-spectrometry, Fluorescence spectroscopy, and/or Reflectance spectroscopy. This paper summarizes the optical design, development, and testing of the CHAMP-SLS optics.

关键词： Camera hand lens microscope microscopy spectroscopy Raman micro-LIBS Fluorescence laser ablation mass-spectrometry

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Correctly making panoramic imagery and the meaning of optical center

Correctly making panoramic imagery and the meaning of optica...

引用

conference on current developments in lens design and optical engineering IX

作者： Johnson, R. Barry Alabama A&M Univ Dept Phys Normal AL 35762 USA

ISBN: (纸本)9780819472809

The production and viewing of panoramic scenes have fascinated people for over a millennium beginning with the camera obscura. With the advent of photography in the mid-1800s, techniques were developed to create panoramic scenes far larger than could be realized by a single camera. Making a panoramic scene from two or more images taken using a film camera was found to be challenging. Various advanced techniques for making panoramic images were developed during the 20(th) century and required specialized cameras and film processing. In recent years, digital cameras and powerful software programs have become readily available to aid in making panoramic imagery although often strange artifacts appears in the composite image. This is generally due to improperly locating the rotation axis of the camera. Interestingly, there is significant argument about where the axis of rotation should be for making proper panoramic imagery. The most common "answer" is the rotation axis should be about the second or rear nodal point, which will be shown in this paper to be incorrect. A second "answer" is to rotate the camera about its optical center. This is also incorrect;however, what actually constitutes the optical center of a lens and its applications will be briefly discussed. Examples of correctly and incorrectly produced panoramic image will be presented.

关键词： optical center cardinal points nodal imaging panoramic panorama Gauss Listing nodal planes

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High-resolution UV relay lens for particle size distribution measurements using holography

High-resolution UV relay lens for particle size distribution...

引用

conference on current developments in lens design and optical engineering IX

作者： Malone, Robert M. Capelle, Gene A. Cox, Brian C. Frogget, Brent C. Grover, Mike Kaufman, Morris I. Pazuchanics, Peter Sorenson, Danny S. Stevens, Gerald D. Tibbitts, Aric Turley, William D. Natl Secur Technol LLC Los Alamos Operat 182 E Gate Dr Los Alamos NM 87544 USA Natl Secur Technol LLC Special Technol Lab Santa Barbara CA 93111 USA Los Alamos Natl Lab Los Alamos NM 87545 USA

ISBN: (纸本)9780819472809

Shock waves passing through a metal sample can produce ejecta particulates at a metal-vacuum interface. Holography records particle size distributions by using a high-power, short-pulse laser to freeze particle motion. The sizes of the ejecta particles are recorded using an in-line Fraunhofer holography technique. Because the holographic plate would be destroyed in an energetic environment, a high-resolution lens has been designed to relay the scattered and unscattered light to a safe environment where the interference fringes are recorded on film. These interference fringes allow particles to be reconstructed within a 12-mm-diameter, 5-mm-thick volume. To achieve resolution down to 0.5 mu m, both a high-resolution optical relay lens and ultraviolet laser (UV) light were implemented. The design and assembly of a nine-element lens that achieves > 2000 lp/mm resolution and operates at f/0.89 will be described. To set up this lens system, a doublet lens is temporarily attached that enables operation with 532-nm laser light and 1100 lp/mm resolution. Thus, the setup and alignment are performed with green light, but the dynamic recording is done with UV light. During setup, the 532-nm beam provides enough focus shift to accommodate the placement of a resolution target outside the ejecta volume;this resolution target does not interfere with the calibrated wires and pegs surrounding the ejecta volume. A television microscope archives images of resolution patterns that prove that the calibration wires, interference filter, holographic plate, and relay lenses are in their correct positions. Part of this lens is under vacuum, at the point where the laser illumination passes through a focus. Alignment and tolerancing of this high-resolution lens will be presented, and resolution variation through the 5-mm depth of field will be discussed.

关键词： UV optical relay holography submicron optical resolution ejecta particle size distribution

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design and analysis of a diffractive astigmatic lens for DVD pickup

Design and analysis of a diffractive astigmatic lens for DVD...

引用

conference on current developments in lens design and optical engineering viiI

作者： Chen, Wen-Jie Chen, Cheng-Huan Univ Minnesota Dept Elect & Comp Engn St Paul MN USA Natl Tsing Hua Univ Dept Power Mech Engn Hsinchu Taiwan

ISBN: (纸本)9780819468154

A refractive astigmatic lens is employed to generate a focus error signal (FES) for servo control in general optical pickup. In this paper, a diffractive optical element (DOE) is designed to implement optical functions of astigmatic focusing for a MEMS-based miniature optical pickup at 650nm wavelength. We present a diffractive astigmatic lens with its internal zones and external zones quantized into four, two phase levels, respectively based on fabrication consideration. The optical simulation based on scalar diffraction theory shows the efficiency of this quantized lens for astigmatic focusing and a comparison of the FES in the optical pickup system has been plotted.

关键词： DVD pickup astigmatic lens diffractive optical element focus error signal

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Studies of the manufacturability of the HOE included in objective of BD/DVD combined optical pick-up head according to the objective lens glass type - art. no. 66670O

Studies of the manufacturability of the HOE included in obje...

引用

conference on current developments in lens design and optical engineering viiI

作者： Lisitsyna, N. V. Bauman Moscow State Tech Univ Moscow 105005 Russia

ISBN: (纸本)9780819468154

The new combined optical pick-up head for recording and playback of information on DVD and BD format discs was developed. The same objective is used for both channels. It consists of the objective lens and Holographic optical Element. In this work we present the main results of the studies of the possibility to manufacture the HOE included in objective of BD/DVD combined optical pick-up head in the dependence on objective lens glass type.

关键词： optical data storage diffractive optics

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Mechanical design and analysis of a variable focal length lens

Mechanical design and analysis of a variable focal length le...

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conference on current developments in lens design and optical engineering viiI

作者： Gonzalez-Garcia, Jorge Cruz-Martinez, Victor Manuel Mendoza-Jasso, Alvaro Jesus Santiago-Alvarado, Agustin Vazquez-Montiel, Sergio Rayas-Alvarez, Juan Antonio Castro-Ramos, Jorge Univ. Tecnológica de la Mixteca (Mexico) Instituto Nacional de Astrofísica Óptica y Electrónica (Mexico) Ctr. de Investigaciones en Óptica (Mexico)

ISBN: (纸本)9780819468154

Studies on adaptive lenses, which are formed of two transparent elastic surfaces and have a transparent liquid medium between them, have focused mostly on the characterization, analysis and optical performance of the proposed lenses. No attention, however, has been given to the mechanical design that would allow the conception of a user-friendly functional mounting that is adaptable to conventional optical systems. This work, therefore, presents the design and manufacturing processes of the mounting for a 20 mm diameter biconvex adaptive lens. It also presents an analysis of the membranes used as elastic surfaces and the images formation of the proposed lens.

关键词： adaptive elastic surfaces liquid lens mounting design

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A compact and cost effective design for cell phone zoom lens

A compact and cost effective design for cell phone zoom lens

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conference on current developments in lens design and optical engineering viiI

作者： Chang, Chir-Weei Wu, Ching-Chin Ind Technol Res Inst Elect & Optoelect Res Labs 195Sec 4Chung Hsing Rd Hsinchu 310 Taiwan EFUN Technol Co Ltd Tainan 70955 Taiwan

ISBN: (纸本)9780819468154

A compact zoom lens design for cell phone is presented. A three groups lens system with five lens element is designed for cell phone camera with 3M pixels and 2.5 similar to 3X optical zoom. The first lens is a negative lens with a concave surface facing the object so that, when used for a long focal length, the rear principle plane is moved forwards to shorten the total length of the lens. A positive lens group composed of three lens elements is arranged at the second lens group. By control the optical power of the second lens group, the distortion can be reduced and also shortens the moving distance of the second lens group while zooming. The fifth lens in the third lens group is a positive lens to control the incident angle entering the photosensitive element. It is used for focusing when the object distance has changed.

关键词： zoom lens cell phone total track length

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optical design method for high zoom ratio lens with liquid lens and digital signal processing

Optical design method for high zoom ratio lens with liquid l...

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conference on current developments in lens design and optical engineering viiI

作者： Hu, Chao-Chang Fang, Yi Chin Tsai, Chen-Mu Lin, Han-Ching Su, Han-Wei Lin, Yu-Cheng Industrial Technology Research Institute-South (Taiwan) National Kaohsiung Univ. of Science and Technology (Taiwan) Kun Shan Univ. (Taiwan)

ISBN: (纸本)9780819468154

This research proposes a newly developed method to high zoom lens for mobile phone use, which the overall length is restricted in mobile phone size acceptable. Generally speaking, the optical design with liquid lens might be more complicated in optimization than traditional optics;not only because aspherical coefficient in liquid lens element is difficult to be defined and measured, but also because efficient optics layout needs more efforts to study in the near future. The paper mainly utilizes liquid lens in order to short total length;two liquid lens elements must be included. Besides consider total length, Lateral aberration also is very important. Lateral aberration will play a significant role in the Modulation Transfer function (MTF), so, the optical design will be able to arise very big, and that the many kinds of chromatics aberration with two groups of liquid lens. Using Digital Signal Processing technology principal factor why this also is.

关键词： optical simulation optical optimization zoom system liquid lens digital signal processing step motor

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Aplanatic hybrid lenses

Aplanatic hybrid lenses

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conference on current developments in lens design and optical engineering viiI

作者： Garcia-Lievanos, O. Vazquez-Montiel, S. Inst Nacl Astrofis Opt & Electr Luis Enr Erro 1 Puebla 72000 Mexico

ISBN: (纸本)9780819468154

We propose a novel method to correct the spherical and coma aberration using a hybrid element (refractive-diffractive). The refractive surface is used to correct the coma, we obtain this condition curving the second principal plane and centred it on the axial point image. The diffractive element is used to correct the spherical aberration using an exact ray trace and the diffractive coefficients as variables. The optimization routine is no required. This method can be used for any conjugates position.

关键词： Monochromatic aberrations Ray tracing lenses lens design Refractive index Spherical lenses Diffraction gratings Distance measurement optical spheres Refraction

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