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The design of Beam Shaping Focused Lens Applied in Solar Energy Concentration

The Design of Beam Shaping Focused Lens Applied in Solar Ene...

引用

conference on current developments in Lens design and optical engineering XII/Advances in Thin Film Coatings viI

作者： Ma, Shih-Hsin Lee, Chi-Hung Lee, Yun-Parn Wu, Jih-Huah Tseng, Chun-Ming Feng Chia Univ Dept Photon Taichung 40724 Taiwan Feng Chia Univ Dept Elect Engn Taichung Taiwan Ming Chuan Univ Dept Elect Engn Taoyuan Taiwan Ming Chuan Univ Dept Biomed Engn Taoyuan Taiwan

ISBN: (纸本)9780819487384

In this paper, we proposed a new configuration of concentrator in solar PV system. A special optical system in the concentrator used in focusing sun light to solar cell is proposed, the system compose of an aspherical surface and a specific diffusing surface. The uniform-squared light pattern is obtained on the solar cell, the shape and size of light pattern can be modulated by the parameters of the diffusing surface. In order to decrease the weight of the lens, the concentrator in Fresnel lens type is built at last. Besides, the optical efficiencies formed by the aspherical concentrator and Fresnel concentrator are about 92% and 77%, the concentrations are about 720mW/mm(2) and 640mW/mm(2), and the acceptance angles are about 0.35 degrees and 0.30 degrees, respectively. The tolerances in assembling the component of the concentrator are also discussed in detail.

关键词： Photovoltaic solar cell solar energy concentrator

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Ultrashort Throw Lenses with Catadioptric Relay Suitable for Flat and Curved Screens 11

Ultrashort Throw Lenses with Catadioptric Relay Suitable for...

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conference on current developments in Lens design and optical engineering XXI

作者： Nishikawa, Jun Nishiyama, Mariko Sony Corp R&D Ctr Atsugi Kanagawa Japan

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

In the past two decades, to realize high resolutions and low distortions while miniaturizing optical systems, various ultrashort throw lenses (USTs) have been proposed. In this work, ultrashort throw lenses with a catadioptric relay (USTCRs) with rotational symmetry are proposed to provide the solution. First, the initial design method of the USTCR and the optimized design solution are presented. Although this optical system with a throw ratio of 0.26:1 has resolutions and distortions equivalent to those of conventional UST with one aspherical mirror, the depth of focus (DOF) on the panel side becomes 1.31 times deeper with appropriate corrections of the field curvature. The total length of the lens is reduced to 0.89 times, the area of the main mirror is reduced to 0.22 times, and the number of lenses is reduced from 13 to 9 elements. Based on these results, several optical designs for USTCR have been tried and an optical design with robustness has been proposed. By optimizing the power of each lens group, the decenter sensitivity improved to 0.46 times for parallel decenter and 0.55 times for tilt decenter. By optimizing glass materials, the shift of focal plane can be suppressed to 0.56 times when the temperature increases by 30 degrees C. An USTCR suited for a curved screen has also been proposed. By introducing appropriate constraints that correct distortions, high resolutions and low distortions have been realized while maintaining a wide angle of view. USTCRs suited for various curved screens are currently underway.

关键词： ultrashort throw projector projection lens catadioptric relay lens lens design lens system design concave mirror curved screen mirror system design

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Silicon Metalens toward a fully Silicon integrated SWIR sensing 25

Silicon Metalens toward a fully Silicon integrated SWIR sens...

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conference on current developments in Lens design and optical engineering XXV

作者： Dupre, Matthieu Ma, Jian Hseih, Biay-cheng Goma, Sergio Qualcomm Technol Inc 5775 Morehouse Dr San Diego CA 92121 USA

ISBN: (纸本)9781510679221;9781510679238

Most Silicon based depth and lidar sensors rely on near-infrared (NIR 750-900nm) sources to produce depth images as Silicon CMOS sensors can achieve a high quantum efficiency for an unbeatable cost at such wavelengths. Advances in short wave infrared (SWIR) sensor technologies, such as Silicon-Germanium sensors, changes this paradigm and opens a new window for groundbreaking sensor designs, as SWIR can push the wavelength above retinal hazard area (>1400nm), allowing for much higher eye safety, due to the low penetration of those wavelengths through the eye lens. Here, we propose to use a Silicon Metalens flat optics and build upon our stacked sensor technologies to obtain a fully Silicon integrated stacked sensor at SWIR wavelengths. We will discuss the design of the stacked sensor and focus on the Silicon Metalens for multiple use-cases. We will demonstrate the results of our Silicon metalens prototype at 1550nm. We will show numerical simulations of the optical stack for eye-tracking application or wide-angle time of flight (TOF) and discuss the necessary trade-offs.

关键词： metalens ToF sensors XR optics lens design

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design of a free-form lens system for short distance projection

Design of a free-form lens system for short distance project...

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conference on current developments in Lens design and optical engineering XII/Advances in Thin Film Coatings viI

作者： Yang, Bo Lu, Kan Zhang, Wei Dai, Fujian Shanghai Univ Sci & Technol Shanghai Key Lab Contemporary Opt Syst Sch Opt Elect & Comp Engn Shanghai 200093 Peoples R China Zhejiang Sunny Opt Co Ltd R&D Dept Yuyao 315400 Zhejiang Peoples R China

ISBN: (纸本)9780819487384

A free-form lens system design is proposed for short distance projection. Free-form surface shape and non-rotational symmetrical structure provide us more freedoms for optimization. The catadioptric structure is also used to reduce the overall length of the whole system. The designed projector lens system consists of two parts. The first part is a rotationally symmetrical lens system which corrects the basic aberrations. The second part contains a free-form lens and a reflector which correct the distortion and other aberrations. We achieve 55inch projected image size at a display screen which is 300mm away from the lens system. The maximum distortion for all fields at all distances is less than 3%.

关键词： optical engine Projection lens Free-form Catadioptric Least-square fitting

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Study of Camera Calibration Process with Ray Tracing 15

Study of Camera Calibration Process with Ray Tracing

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conference on current developments in Lens design and optical engineering XV

作者： Poulin-Girard, A. -S. Dallaire, X. Veillette, A. Thibault, S. Laurendeau, D. Univ Laval Dept Phys Genie Phys & Opt Ctr Opt Photon & Laser Quebec City PQ G1V 0A6 Canada Univ Laval Dept gen elect & gen informat Lab vision & syst numer Quebec City G1V 0A6 PQ Canada

ISBN: (纸本)9781628412192

Camera calibration is essential for any optical system used to obtain 3D measurements from images. The precision of the 3D depth estimation relies on an appropriate camera model and the accurate estimation of model parameters. These parameters are sensitive to environmental conditions and it is well established that a vision system should be calibrated in operating conditions. This is not always possible since the calibration process is often tedious and time-consuming. Unfortunately, the use of poorly estimated calibration parameters for 3D reconstruction and measurements may lead to suboptimal performance of the system and inaccurate depth estimation. This paper presents a technique using an existing camera model and optical design software to perform calibration simulations. This virtual calibration technique allows for a study of the impact of environmental conditions on the calibration parameters. Using this procedure, it is also possible to predict the statistical behavior of the calibration parameters considering the chosen fabrication processes and tolerances. It can assist vision scientists in the choice of the optical system that best meets the requested precision of the 3D reconstruction. This technique could eventually be integrated in the lens design process to create more reliable optical systems that could be calibrated and used in a range of environmental conditions with a very small variation of their calibration parameters.

关键词： Camera calibration optical design software tolerancing lens design

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Low profile optic design for mobile camera using dual freeform reflective lenses

Low profile optic design for mobile camera using dual freefo...

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conference on current developments in Lens design and optical engineering viI

作者： Jeong, Ho-Seop Yoo, Ho-Sik Lee, Sang-Hyuk Oh, Hae-Ran Samsung Elect Mech Cent R&D Inst Opt Lab Suwon 443743 South Korea

ISBN: (纸本)0819463671

Aspherical glass or plastic lenses are usually adapted in the camera module of handheld phone. Recently, slimmer cameras are required according to reducing thickness of handheld phone. In this paper, we present an ultra slim camera module using multiple freeform off-axis imaging lenses. New optical concept of multiple lens system introduces the planar optics with freeform. shaped aspherical lens surface on the wafer, which can achieve the thickness of 50% compared to the conventional symmetric lens system. In order to achieve the resolution specification, we separate the field of view in camera module. As the result, two inverted images are produced on a same imaging sensor and the acquired inverted images are processed by photo stitching algorithm so as to combine them. Finally, in order to verify the new imaging system, we manufacture the new slim lens through the LJV embossing replication process. We found the new imaging system is feasible for VGA resolution and it can be expandable to the high resolution system.

关键词： freeform. surface planar integrated optics photo stitching wafer scale lens UV embossing

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vision multiplexing: an optical engineering concept for low-vision aids

Vision multiplexing: an optical engineering concept for low-...

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conference on current developments in Lens design and optical engineering viII

作者： Peli, Eli Harvard Univ Sch Med Dept Ophthalmol Schepens Eye Res Inst Boston MA 02115 USA

ISBN: (纸本)9780819468154

The normal visual system provides a wide field of view apparently at high resolution. The wide field is continuously monitored at low resolution for navigation and detection of objects of interest. These objects are sampled using the high-resolution fovea, applying a temporal multiplexing scheme. Most vision impairments that cause low vision impact upon only one of the components;the peripheral low-resolution wide field or the central high-resolution fovea. The loss of one of these components prevents the interplay of central and peripheral vision needed for normal function and causes disability. Traditional low-vision aids improve the impacted component, but usually at a cost of a significant loss in the surviving component. For example, magnifying devices increase resolution but reduce the field of view, while minifying devices increase the field of view but reduce resolution. A general optical engineering approach - vision multiplexing - is presented. vision multiplexing seeks to provide both the wide field of view and the high-resolution information in ways that could be accessed and interpreted by the visual system. The use of various optical and electro-optical methods in the development of a number of new visual aids, all of which apply vision multiplexing to restore the interplay of high-resolution and wide-angle vision using eye movements in a natural way, will be described. vision-multiplexing devices at various stages of development and testing illustrate the successes and difficulties in applying this approach for patients with tunnel vision, hemianopia (half blindness), and visual acuity loss (usually due to central retinal disease).

关键词： bioptic telescope in-the-lens telescope IOL macular degeneration peripheral prisms retinitis pigmentosa

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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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Recent progress in lead-salt lasers

Recent progress in lead-salt lasers

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Laser Diodes and Applications II conference

作者： Ishida, A Fujiyasu, H SHIZUOKA UNIV DEPT ELECT & ELECTR ENGNHAMAMATSUSHIZUOKA 432JAPAN

ISBN: (纸本)0819420565

Lead-salt narrow gap semiconductors are useful materials for mid infrared lasers operating at 2.5 - 20 micrometer range. In this paper, we review recent advances in the lead-salt mid- infrared lasers, and propose a new intersubband laser using type-II superlattice structure. Progress in growth methods, studies on band offsets of heterostructures including superlattices, and developments of new lead-salt materials improved the device performance such as operation temperature, threshold current, and wavelength coverage. In PbSnTe system, design of laser structures taking into account the type-I' band offsets realized high- performance long-wavelength lasers with wavelength coverage to 20 micrometer. Development of new active layer materials such as PbEuTe, PbSrSe, and PbSrS realized effective carrier confinement, and extremely increased operation temperature of the lasers in 2.5 - 6 micrometer range. Introduction of quantum wells into the active layer is giving further possibility to the lead-salt mid-infrared lasers.

关键词： lead salt IV-vi compound infrared laser intersubband laser quantum well superlattice

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Significant Cost Reduction through New optical, Thermal and Structural design for a Medium-CPV System

Significant Cost Reduction through New Optical, Thermal and ...

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conference on High and Low Concentrator Systems for Solar Electric Applications vi

作者： Finot, Marc MacDonald, Bob Skyline Solar Inc Mountain View CA 94041 USA

ISBN: (纸本)9780819487186

The design of cost-efficient medium-concentration PV (MCPV) systems requires the analysis of dozens of engineering, manufacturing and financial trade-offs. In 2007, Skyline Solar designed its first system, the HGS1000, based on a 7x concentration factor and 0.5 m aperture width. At the then-current cost of components, this was the optimum design. However, as the cost of silicon cells has fallen and the efficiency of cells has improved, the least-cost point has moved. This paper explains how we used the combination of field data and advanced performance modeling to re-optimize the design for lowest levelized cost of energy (LCOE) and achieve 40% cost reduction.

关键词： CPV MCPV medium concentration solar energy production high gain solar

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