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Review of optical design for vehicle forward lighting based on white LEDs

Ching-Cherng Sun, Chi-Shou Wu, Yong-Sheng Lin, Yi-Jou Lin, Cheng-Yan Hsieh, Shih-Kang Lin, Tsung-Hsun Yang, Yeh-Wei Yu
2021 Optical Engineering: The Journal of SPIE  
Three optical design approaches are discussed; these include a projection lens incorporated with a baffle or beam shaper, multisegment reflectors, and complex lenses.  ...  Finally, we introduce three approaches to adaptive forward lighting that provide a driver with brighter and clearer vision without inducing glare to people on the roadway.  ...  Acknowledgments The authors thank the Ministry of Science and Technology of Taiwan with Grant Nos. of MOST 108-2622-E-008-010-CC2 and 109-2622-E-008-014-CC2.  ... 
doi:10.1117/1.oe.60.9.091501 fatcat:4u6pvucvjzbpde26oyy45uon2q

Illumination system design in a project-based course

R. John Koshel, Vineeth Abraham, Joshua Kim, Ron Liu, Scott Richardson, Soha Namnabat, Amber Czajkowski, Rania H. Abd El-Maksoud, Ryan Irvin, Takeshi Nakazawa, Michael Kudenov, Martha Dawsey (+8 others)
2009 Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VI  
Projects included source modeling, displays, daylighting, light pollution, faceted reflectors, and stray light analysis.  ...  These lectures harped on the important points of conservation of étendue, source modeling and tolerancing, and that no optic can be made perfectly.  ...  Organization (ASAP) for access to their optical design and analysis software.  ... 
doi:10.1117/12.828806 fatcat:k7sp2siekfhr3kbmltgyvk6i2u

Laser-Based Lighting: Experimental Analysis and Perspectives

Nicola Trivellin, Maksym Yushchenko, Matteo Buffolo, Carlo De Santi, Matteo Meneghini, Gaudenzio Meneghesso, Enrico Zanoni
2017 Materials  
In the first part of the paper we discuss the main advantages and issues of laser-based lighting, and present a comparison with conventional LED-lighting technology.  ...  This paper presents an extensive analysis of the operating principles, theoretical background, advantages and limitations of laser-based lighting systems.  ...  Author Contributions: All the authors have equally contributed to the development of this work. Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/ma10101166 pmid:29019958 pmcid:PMC5666972 fatcat:4k3h442nqfghnfhv4h4zu2cx6q

Non-dispersive infra-red (NDIR) measurement of carbon dioxide at 4.2μm in a compact and optically efficient sensor

Jane Hodgkinson, Richard Smith, Wah On Ho, John R. Saffell, Ralph P. Tatam
2013 Sensors and actuators. B, Chemical  
and a pathlength of 32 mm.  ...  A detailed analysis of the design is presented, with the results of optical raytracing, showing a raytrace estimate for 4% of the total emitted radiation reaching each of two separated detector elements  ...  An optical cell with similar dimensions and elliptical reflectors has also been developed, and used by Hök et al in 4 the detection of breath ethanol [18] .  ... 
doi:10.1016/j.snb.2013.06.006 fatcat:ljk35se2dvf67kgyjys7ml3cgu

Ultracompact optics for optical wireless communications

Juan C. Minano, Pablo Benitez, Ruben Mohedano Arroyo, Jose L. Alvarez, Maikel Hernandez, Juan-Carlos Gonzalez, Kazutoshi Hirohashi, Satoru Toguchi, Eric J. Korevaar
1999 Optical Wireless Communications II  
This work will show the results of the measurements done with several RXI prototypes of 40-mm aperture diameter, all of them made of PMMA (by injection process).  ...  times with an acceptance angle of ±2.14 degrees).  ...  Comisión Interministerial de Ciencia y Tecnología.and contracts 06T/027/96 and 07T/0032/98 of the Consejería de Educación y Cultura of the Spanish Comunidad Autónoma de Madrid.  ... 
doi:10.1117/12.372814 fatcat:ztnevum3wnhmfkkh5f3avyntxi

Diode pumping of a solid-state laser rod by a two-dimensional CPC–elliptical cavity with intervening optics

Dawei Liang, Rui Pereira
2007 Optics Communications  
Depending on the width of the pump source, optimized rod mounting position is found through a non-sequential ray-tracing analysis.  ...  By comparing with the performance of a 2D-CPC-CPC cavity, significant improvements in both absorption efficiency and absorption distribution are achieved by a 2D-CPC-EL cavity.  ...  The transfer efficiency of the elliptical cavity and its dependence upon the cross-sectional dimension of the reflector, the radiant source, the laser crystal, the wall reflectivity and the ellipse eccentricity  ... 
doi:10.1016/j.optcom.2007.02.024 fatcat:u3azdkfbbrbgldhnifbr36cnue

A review of nonimaging solar concentrators for stationary and passive tracking applications

Srikanth Madala, Robert F. Boehm
2017 Renewable & Sustainable Energy Reviews  
This paper also explores the idea of coupling nonimaging concentrators with passive solar tracking mechanism. (S. Madala). Renewable and Sustainable Energy Reviews (xxxx) xxxx-xxxx 1364-0321/  ...  The economic benefits are appealing owing to the elimination of tracking costs (installation, operation & maintenance and auxiliary energy).  ...  point and, thus, unable to form an image of the light source.  ... 
doi:10.1016/j.rser.2016.12.058 fatcat:uejg53eg4rc65lgkxul37c62le

Non-edge-ray design: improved optical pumping of lasers

Ian A. Walmsley
2004 Optical Engineering: The Journal of SPIE  
Standard edge-ray design is shown to limit performance, with both numerical and experimental results.  ...  Two alternative pump cavity reflectors are developed and the improvements in the outputs from the lasers in TEM 00 modes are presented.  ...  Acknowledgments This work was supported in part by CMXR, Inc, through the Small Business Innovative Research ͑SBIR͒ program when both authors were at the Institute of Optics, University of Rochester, New  ... 
doi:10.1117/1.1751400 fatcat:72ctq5bdhnekrkwafurin7fgrq

Instrumental aspects of x-ray microbeams in the range above 1 keV

P. Dhez, P. Chevallier, T. B. Lucatorto, C. Tarrio
1999 Review of Scientific Instruments  
The first is the development of high-brightness second-and third-generation synchrotron light sources that can be used with small-aperture optics. The second is a revolution in x-ray optics.  ...  X-ray microscopy has the capability of looking into normally opaque samples with high resolution.  ...  The beamline is used for trace analysis and can be used either with a doublecrystal monochromator or with white light for more sensitive measurements of about 1 ppm.  ... 
doi:10.1063/1.1149733 fatcat:mehj2v3ouveohnh2qup65o43em

Phase randomization for spatiotemporal averaging of unwanted interference effects arising from coherence

Fergal Shevlin
2018 Applied Optics  
An approach to the reduction of unwanted interference effects, such as speckle and inhomogeneity, is to generate sequences of uncorrelated effects over the integration period of the sensor such that they  ...  It is shown to offer a unique combination of advantages over moving diffusers, including optical efficiency, speed, size, and reliability. Various applications are discussed.  ...  DLP projection display with illumination optical system modified to include deformable mirror and to accept light from an external 532 nm laser source.  ... 
doi:10.1364/ao.57.0000e6 pmid:30117915 fatcat:g7635gh4d5ffvkyss6vppief3m

Excess noise in Lidar Thomson scattering methods

R J Smith, L A P Drake, J B Lestz
2012 Journal of Instrumentation  
Polarimetric measurements in the far infrared regime are shown to reach sensitivities that are instructive and useful but with a complex behaviour that make spatially resolved measurements all but mandatory  ...  The utility and importance of developing Lidar Thomson scattering at longer wavelengths for the magnetic fusion program is illustrated by a study of sightline (local) polarimetry measurements on a 15MA  ...  Alexei Polevoi, Alberto Loarte and Thomas Casper for providing the simulated ITER plasma parameters and equilibrium data.  ... 
doi:10.1088/1748-0221/7/02/c02012 fatcat:ovblyi3gcjfczm2bc6ovimw5ca

Survey of on-road image projection with pixel light systems

Ley Peer-Phillip, Roland Lachmayer, Sadiq Rizvi, Marvin Knöchelmann, Petr Páta, Karel Fliegel
2017 Photonics, Devices, and Systems VII  
ACKNOWLEDGEMENTS This project was funded by the Lower Saxony Ministry of Science and Culture within the framework of the PhD-program 'Tailored Light'.  ...  I would like to extend thanks to my colleagues and supervisor at IPeG for their valuable input, especially the workshop staff for helping install the pixel light system onto the test car and to Bastian  ...  If a high intensity discharge lamp is used as a light source, an elliptical reflector is necessary to collect and focus the light from the lamp onto a small point on the integrator rod.  ... 
doi:10.1117/12.2292740 fatcat:tdrcycb2ofeb3jtj4vppih2p6i

Laser-Aided Plasma Diagnostics

A.J.H. Donné, C. J. Barth
2006 Fusion science and technology  
Incoherent Thomson scattering is used for highly localized measurements of the electron temperature and density in the plasma.  ...  Laser-aided diagnostics are widely applied in the field of high temperature plasma diagnostics for a large variety of measurements.  ...  The width and shape of the spectral channels of a filter spectrometer can be calibrated by means of a tunable light source (e.g. a white light source in combination with a monochromator).  ... 
doi:10.13182/fst06-a1137 fatcat:cajn6hlmovhnhpoe2duckr6bqm

New techniques in ultraviolet astronomical polarimetry: wide-field imaging and far-ultraviolet spectropolarimetry

Kenneth H. Nordsieck, Pamela Marcum, Kurt P. Jaehnig, Donald E. Michalski, Silvano Fineschi
1994 X-Ray and Ultraviolet Polarimetry  
It will consist of a 0.4m parabolic primary with polarimetric optics at the prime focus and a far ultraviolet spectrometer.  ...  This instrument is to have a resolution of better than 0.1 nm and a spectral coverage from 105 to 145 nm.  ...  The primary reason for this is the confusion of processes that greatly complicate measurement and analysis of ground-based visible-wavelength diffuse polarimetry.  ... 
doi:10.1117/12.168586 fatcat:zexkuzikovff5j2z54cs54y2m4

9th Laser Display and Lighting Conference: Abstract Book

Kazuo Kuroda, Hiroshi Murata
2020 9th Laser Display and Lighting Conference  
Fig. 2 A plasmonic spectral filter (a plasmonic mirror) with the metal-insulator-metal (MIM) structure (upper) and white LED spectra before and after filtering (bottom).  ...  Wilczynska, and M. Makowski, "Aberration-corrected holographic projection on a twodimensionally highly tilted spatial light modulator," Opt.  ...  While the LED light comes from an area of 0.3x0.3 mm² with a symmetric beam with 34° FWHM, the laser is a point source radiating an elliptical beam with 6.5° and 22° FWHM for fast and slow axis, respectively  ... 
doi:10.1117/12.2574806 fatcat:zu6picunx5cyfi5uq3gfnixzfi
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