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design of a radiance meter with predicted size of source and distance effects 17

Design of a radiance meter with predicted size of source and...

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Conference on current developments in lens design and optical engineering Xvii

作者： Suarez-Romero, J. G. Solorio-Leyva, J. C. Hurtado-Ramos, J. B. Tecnolo Nacl Mexico lnst Tecnolo Queretaro Tecnolo SN Esq Escobedo Queretaro 76000 Qro Mexico Tecnol Nacl Mexico Inst Tecnol Piedad Tecnol 2000 La Piedad 59370 Michoacan Mexico Inst Politecnico Nacl Centro Invest Ciencia Aplicada Tecnol Cerro Blanco 141 Queretaro 76090 Qro Mexico

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

In a previous work, we described the theoretical fundamentals for the design of radiance meters. There, we observed that the length between the first and the second aperture of the instrument plays an important role in the performance of the meter. Such a length is a parameter related with the instrument response to variations of the size of the source and of the distance between the instrument and the source. Such dependences are not predicted by the theory of geometrical optics, normally used in the instrument design. Even the approximation of wave optics gives a partial understanding of the propagation of optical radiation. A more general treatment, based in the theory of partial coherence, gives a better description of the propagation.

关键词： Radiometry Radiance meter Partial Coherence Diffraction Lambertian Source Distance Effect Size of Source Effect Diffraction Corrections

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optical design and tolerancing of a hyperspectral imaging spectrometer 17

Optical design and tolerancing of a hyperspectral imaging sp...

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Conference on current developments in lens design and optical engineering Xvii

作者： Liu, Chang Straif, Christoph Fluegel-Paul, Thomas Zeitner, Uwe D. Gross, Herbert Friedrich Schiller Univ Jena D-07743 Jena Germany DLR Space Adm D-53227 Bonn Germany Fraunhofer Inst Angew Opt & Feinmech D-07745 Jena Germany

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

A hyperspectral imaging spectrometer covering the wavelength range from 420 nm to 1000 nm is designed for the purpose of monitoring Earth's environmental change. It has an entrance slit length of 24 mu m, f/# of 3, smile and keystone distortion smaller than 20% of the pixel pitch and a spectral resolution of 6.5 nm. We design and review thirteen systems including one Offner system, two Schwarzschild systems and ten TMA systems for such specifications. Freeform surface and aspheric surface are used in some of the systems to achieve the required system parameters. With all system performance being summarized and evaluated, advantages and disadvantages of three different system types are compared. We down select two systems for further fine adjustments and tolerancing analysis. Final systems with superior performance and detailed tolerancing analysis are given at the end.

关键词： spectrometer TMA Schwarzschild tolerancing

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design investigation of a cost-effective dual-band (MWIR/LWIR) and a wide band optically athermalized application 17

Design investigation of a cost-effective dual-band (MWIR/LWI...

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Conference on current developments in lens design and optical engineering Xvii

作者： Ding, Fujian Washer, Joe Morgen, Daniel ISP OPT 50 S Buckhout St Irvington NY 10533 USA

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

Dual-band and wide-band lenses covering both the MWIR and LWIR spectral bands are increasingly needed as dual-band MWIR/LWIR detectors have become prevalent and broadband applications have expanded. currently in dual-band /wide-band applications, the use of more than three elements per lens group and the use of chalcogenide glass is common. This results in expensive systems. Also, many chalcogenides are available only in small diameters, which is a problem for large aperture broadband lenses. In this paper an investigation of cost-effective designs for dual-band MWIR/LWIR lens using only widely available IR materials, specifically Ge, ZnSe and ZnS were performed. An athermalized dual-band MWIR/LWIR using these three materials is presented. The performance analysis of this lens shows that this design form with these three common IR materials works well in certain applications. The required large size blanks of these materials can be easily obtained. Traditional chromatic aberration correction without diffraction for either wide-band or dual-band application was employed. In addition, the methods of harmonic diffraction for dual-band applications, especially with one narrow band, were used for two different presented designs.

关键词： IR Imaging IR Wide-band lens Dual-band lens Athermalization Chromatic Aberration Correction Harmonic diffraction

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optical design of an ultrashort throw ratio projector with two freeform mirrors 17

Optical design of an ultrashort throw ratio projector with t...

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Conference on current developments in lens design and optical engineering Xvii

作者： Nie, Yunfeng Mohedano, Ruben Benitez, Pablo Chaves, Julio Minano, Juan C. Thienpont, Hugo Duerr, Fabian Vrije Univ Brussel Dept Appl Phys & Photon Brussels Photon Team Pleinlaan 2 B-1050 Brussels Belgium Light Prescript Innovators Madrid 28223 Spain Light Prescript Innovators Altadena CA 91001 USA Univ Politecn Madrid CeDint Campus Montegancedo Pozuelo Madrid 28223 Spain

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

In this work, an optical design approach is presented to design an ultrashort throw distance projection system by combination of an off-the-shelf refractive lens and two off-axis freeform mirrors. These two freeform mirrors are used to greatly shorten the projection distance by more than three times compared to conventional (rotationally symmetric) systems, while still maintaining a good imaging quality. Firstly, a direct design method that enables the simultaneous calculation of two off-axis freeform-profile mirrors by partially coupling more than three fields is introduced. The specifications of the conventional refractive lens are taken into account during this procedure. The pupil matching principle is applied to ensure good performance between the two sub-systems. The calculated mirrors then serve as a good starting point for optimization using commercial optical design software. To step from freeform profiles to freeform surfaces, the calculated two profiles are fitted into odd polynomials to evaluate the image quality and then re-fitted into XY polynomials for further optimization. Finally, the polynomial coefficients of the two freeform mirrors are imported into the optical design program. The merit function is built from RMS spot radii over the full field, and additional constraints are made for correcting distortion. After optimization, the calculated initial design quickly converges to a well performing imaging system. As an example, an ultrashort throw distance projection lens with a large 80-inch diagonal image at 400mm throw distance is designed, analyzed and compared with literature data. The values of MTF are over 0.6 at 0.5 lp/mm and the distortion is less than 1.5%: showing a very good and well balanced imaging performance over the entire field of view.

关键词： geometric optics ultrashort throw ratio projector optical design aspheric mirrors freeform optics

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Reduce Volume of Head-Up Display by Image Stitching 17

Reduce Volume of Head-Up Display by Image Stitching

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Conference on current developments in lens design and optical engineering Xvii

作者： Chiu, Yi-Feng Su, Guo-Dung J. Natl Taiwan Univ Grad Inst Photon & Optoelect 1Roosevelt RdSect 4 Taipei Taiwan

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

Head-up Display (HUD) is a safety feature for automobile drivers. Although there have been some HUD systems in commercial product already, their images are too small to show assistance information. Another problem, the volume of HUD is too large. We proposed a HUD including micro-projectors, rear-projection screen, microlens array (MLA) and the light source is 28 mm x 14 mm realized a 200 mm x 100 mm image in 3 meters from drivers. We want to use the MLA to reduce the volume by virtual image stitching. We design the HUD's package dimensions is 12 cm x 12 cm x 9 cm. It is able to show speed, map-navigation and night vision information. We used Liquid Crystal Display (LCD) as our image source due to its brighter image output required and the minimum volume occupancy. The MLA is a multi aperture system. The proposed MLA consists of many optical channels each transmitting a segment of the whole field of view. The design of the system provides the stitching of the partial images, so that we can see the whole virtual image. (C) 2016 optical Society of America

关键词： Heads up displays Microlens array Light sources Distortion Eye models LCDs Microlens Night vision optical design Spherical lenses

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Novel microfluidic devices for Raman spectroscopy and optical trapping 17

Novel microfluidic devices for Raman spectroscopy and optica...

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Conference on current developments in lens design and optical engineering Xvii

作者： Ottevaere, Heidi Liu, Qing de Coster, Diane Van Erps, Juergen Vervaeke, Michael Thienpont, Hugo Vrije Univ Brussel Dept Appl Phys & Photon Brussels Photon Team Pleinlaan 2 B-1050 Brussels Belgium

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

Traditionally, Raman spectroscopy is done in a specialized lab, with considerable requirements in terms of equipment, time and manual sampling of substances of interest. We present the modeling, the design and the fabrication process of a microfluidic device incorporation Raman spectroscopy, from which one enables confocal Raman measurements on-chip. The latter is fabricated using ultra precision diamond tooling and is tested in a proof-of-concept setup, by for example measuring Raman spectra of urea solutions with various concentrations. If one wants to analyze single cells instead of a sample solution, precautions need to be taken. Since Raman scattering is a weak process, the molecular fingerprint of flowing particles would be hard to measure. One method is to stably position the cell under test in the detection area during acquisition of the Raman scattering such that the acquisition time can be increased. Positioning of cells can be done through optical trapping and leads to an enhanced signal-to-noise ratio and thus a more reliable cell identification. Like Raman spectroscopy, optical trapping can also be miniaturized. We present the modeling, design process and fabrication of a mass-manufacturable polymer microfluidic device for dual fiber optical trapping using two counterpropagating single-mode beams. We use a novel fabrication process that consists of a premilling step and ultraprecision diamond tooling for the manufacturing of the molds and double-sided hot embossing for replication, resulting in a robust microfluidic chip for optical trapping. In a proof-of-concept demonstration, we characterize the trapping capabilities of the hot embossed chip.

关键词： Raman spectroscopy optical trapping optics polymer microfluidic confocal detection diamond machining microstructure fabrication

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Studying the back-scattering of light for the development of acousto- optical filter with an improved spectral resolution 17

Studying the back-scattering of light for the development of...

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Conference on current developments in lens design and optical engineering Xvii

作者： Shcherbakov, Alexandre S. Arellanes, Adan Omar Chavushyan, Vahram Natl Inst Astrophys Opt & Elect INAOE Luis Enrique Erro 1 AP 51 & 216 Puebla 72000 Mexico

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

We consider the collinear backward light scattering as one of potential physical mechanisms for creating an advanced collinear acousto-optical filter with significantly improved spectral resolution. Within co-directional crystalline collinear acousto-optical filters, the resolution is inversely proportional to the material's birefringence, which is similar to 0.1 in the best case of LiNbO3-crystal. For the backward light scattering this parameter is replaced by the twice refractive index, so that the gain achieves > 45 times in LiNbO3-crystal. Thus, one can expect the resolution similar to 0.002 angstrom instead of the val similar to 0.1 0.2 recently obtained by us experimentallor co-directional geometry in that crystal. Moreover, the collinear backward light scattering can be implemented in an extended amount of available materials. However, the main limitation for applying the phenomenon is the acoustic attenuation in ultra-high frequency range peculiar to the materials for acousto-optical filters. Linear acoustic attenuation reduces the length of acousto-optical interaction and limits the spectral resolution. At an initial stage, our studies are concentrated on physical aspects of this phenomenon as well as on possibilities of its application to creating the acousto-optical filters of a high resolution. In particular, the frequency band-shapes of the scattered light intensity exhibit a tendency to specific acousto-optical nonlinearity, i.e. to more and more rectangular profile as the acoustic power density grows. Results of this analysis confirm the above-noted estimations for a triplet of trigonal acousto-optical crystals, having possibly lower acoustic attenuation.

关键词： acousto-optics collinear acousto-optical filter backward light scattering improved spectral resolution astrophysical applications

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Proceedings of SPIE - The International Society for optical engineering

Proceedings of SPIE - The International Society for Optical ...

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current developments in lens design and optical engineering Xvii

ISBN: (纸本)9781510602861

The proceedings contain 35 papers. The topics discussed include: some methods for determining the limit of potential image quality of optical systems of various complexities using the database;optical design of an ultrashort throw ratio projector with two freeform mirrors;reduce volume of head-up display by image stitching;optical performance of a PDMS tunable lens with automatically controlled applied stress;fabrication of focus-tunable liquid crystal microlens array with spherical electrode;characterization of a tunable liquid-filled lens with minimum spherical aberration;design of a radiance meter with predicted size of source and distance effects;formation of the color image based on the vidicon TV camera;AND efficient 3M PBS enhancing miniature projection optics.

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Proceedings of SPIE - The International Society for optical engineering

Proceedings of SPIE - The International Society for Optical ...

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optical design and Testing vii

ISBN: (纸本)9781510604612

The proceedings contain 58 papers. The topics discussed include: diffractive optical elements for multi-dimensional subdiffraction-limit spot generation: design, demonstration, and characterization;aberration vignetting phenomena and its visualization in wide angular objectives;single-pixel imaging by Hadamard transform and its application for hyperspectral imaging;two-dimensional analytical modeling of a linear variable filter for spectral order sorting;application of q-type aspheric surface in the design of Wynne-Dyson projection lens;design and verification of a flat-field aberration-corrected concave blaze grating for hyperspectral imaging;aspheric and free-form surfaces test with non-null sub-aperture stitching;optical legacy of imperial college London;visual analysis of the computer simulation for both imaging and non-imaging optical systems;measurement of optical system aberrations based on randomly encoded hybrid grating;spatial distribution of current density and thermal resistance of high-power AlInGaN 'vertical' and 'face-up' light-emitting diodes;optimization technique of wavefront coding system based on ZEMAX externally compiled programs;research on characteristic of radiometric imaging quality for space-borne camera with super-wide field of view;a design of panoramic lens system to realize the projection from the local annular object field to rectangular image field by using freeform surfaces;and slope error tolerance analysis for candela distribution of total-internal-reflection collimating lens.

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Proceedings of SPIE - The International Society for optical engineering

Proceedings of SPIE - The International Society for Optical ...

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Next Generation Technologies for Solar Energy Conversion vii

ISBN: (纸本)9781510602656

The proceedings contain 21 papers. The topics discussed include: solar-thermophotovoltaic systems using spectrally selective absorber/emitter based on metal-dielectric multilayer;high-efficiency solar energy conversion with spectrum splitting prismatic lens and multiple independent PV cells;metal hydrides as hot carrier solar cell absorber materials;Type II GaSb/GaAs quantum rings with extended photoresponse for efficient solar cells;up-conversion equivalent circuit to boost current in Si cells;comparison of holographic lens and filter systems for lateral spectrum splitting;segmented holographic spectrum splitting concentrator;three junction holographic micro-scale PV system;environmental stability study of holographic solar spectrum splitting materials;concept of a methodical process for the design of concentrating photovoltaic systems according to the context of use;tuning the colors of C-Si solar cells by exploiting plasmonic effects;measurement of photoluminescence from a twisted-nematic liquid crystal/dye cell for an application in an energy-harvesting display;performance assessment and transient optimization of multi-stage solid desiccant air conditioning systems with building PV/T integration;and energy storage capability of the dye sensitized solar cells via utilization of highly porous carbon electrodes.

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