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检索条件"任意字段=Conference on Current Developments in Optical Design and Engineering V"

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optical spherometer for measuring large curvature radii of convex surfaces 18

Optical spherometer for measuring large curvature radii of c...

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conference on current developments in Lens design and optical engineering XvIII

作者： Alvarado Martinez, Jorge de Jesus vazquez y Montiel, Sergio Camacho Bello, Cesar Joel Univ Politecn Tulancingo Tulancingo Hgo Mexico Univ Interserrana Estado Puebla Puebla Mexico

ISBN: (纸本)9781510612082;9781510612075

Measuring large curvature radii of convex surfaces with high precision is a challenge because the spherometer's focus must be positioned at the apex of the surface and at the center of curvature of the surface by moving the surface or the spherometer. If the radius of curvature is larger than the back focus of spherometer, then measurement is not possible. In this work, we propose to use the FOCOIvA system1 to move the focus of the spherometer in longitudinal way without modifying the f number by moving two lenses inside it, with this mechanism it is possible to measure radii of curvature of several meters in length. The curves of movement of the lenses and the optical parameters of the lenses that compose the spherometer are presented.

关键词： optical design spherometer radii of curvature convex surfaces

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design of off-axial Gregory telescope design with freeform mirror corrector 18

Design of off-axial Gregory telescope design with freeform m...

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conference on current developments in Lens design and optical engineering XvIII

作者： Bazhanov, Yu. vlakhko, v. Corp Precis Syst & Instruments 53 Aviamotornaya Str Moscow 111024 Russia Dynaoptics 8 Boon Lay Way Singapore 609964 Singapore

ISBN: (纸本)9781510612082;9781510612075

In this paper a well-known approach is used for calculation of off-axis three-mirror telescope. It includes usage of conic cross-sections properties, each of the sections forming a stigmatic image. To create a compact optical system, a flat mirror aberration corrector is introduced, which is at later stage transformed into a free-form surface in order to compensate field aberrations. Similarly, one can introduce such a corrector in finalized layout for its further optimization and getting a suitable form, including the conversion of multimirrors axial optical system into decentered one. As an example, off-axial Gregory telescope embodiment is used for infrared waveband region, due to the fact that, unlike the Cassegrain telescope, it provides a real exit pupil, and usage of the mirror corrector brings several advantages. Firstly, this feature may be used to include cold stop or adaptive mirror in the exit pupil, wherein corrector is introduced into a converging beam before the focus of the first mirror. Secondly, when placing corrector in the exit pupil of the optical system it is possible to eliminate high and low order aberrations of center point, which in turn improves optical system f-number, and minimize field aberrations. As another example, off-axial Ritchey-Chretien telescope embodiment is used as a good fit for visible region systems. Analysis and calculation results of optical systems with free-form correctors with surfaces, defined by Power polynomial series are presented in this paper. Advantages of different freeform surfaces usage depends on optical system layouts specifics.

关键词： Mirrors Telescopes Aberration theory Infrared telescopes Lens design Image analysis Infrared radiation optical design optical instrument design Telescope design

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Mauna Kea Spectroscopic Explorer (MSE): a preliminary design of multi-object high resolution spectrograph 7

Mauna Kea Spectroscopic Explorer (MSE): a preliminary design...

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conference on Ground-Based and Airborne Instrumentation for Astronomy vII

作者： Zhang, Kai Zhou, Yifei Tang, Zhen Saunders, Will venn, Kim A. Shi, Jianrong McConnachie, Alan W. Szeto, Kei Wang, Lei Zhu, Yongtian Hu, Zhongwen Chinese Acad Sci Natl Astron Observ Nanjing Inst Astron Opt & Technol Nanjing 210042 Jiangsu Peoples R China Chinese Acad Sci Key Lab Astron Opt & Technol Nanjing Inst Astron Opt & Technol Nanjing 210042 Jiangsu Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China Australian Astron Observ N Ryde NSW 2113 Australia Univ Victoria Victoria BC V8P 5C2 Canada Chinese Acad Sci Natl Astron Observ China Beijing 100012 Peoples R China CFHT Corp Kamuela HI 96743 USA Natl Res Council Canada Victoria BC V9E 2E7 Canada

ISBN: (数字)9781510619586

ISBN: (纸本)9781510619586

The Maunakea Spectroscopic Explorer (MSE) project will transform the CFHT 3.6m optical telescope to a 10m class dedicated multi-object spectroscopic facility, with an ability to measure thousands of objects with three spectral resolution modes respectively low resolution of R approximate to 3,000, moderate resolution of R approximate to 6,000 and high resolution of R approximate to 40,000. Two identical multi-object high resolution spectrographs are expected to simultaneously produce 1084 spectra with high resolution of 40,000 at Blue (401-416nm) and Green (472-489nm) channels, and 20,000 at Red (626-674nm) channel. At the Conceptual design Phase (CoDP), different optical schemes were proposed to meet the challenging requirements, especially a unique design with a novel transmission image slicer array, and another conventional design with oversize volume Phase Holographic (vPH) gratings. It became clear during the CoDP that both designs presented problems of complexity or feasibility of manufacture, especially high line density disperser (general name for all kinds of grating, grism, prism). At the present, a new design scheme is proposed for investigating the optimal way to reduce technical risk and get more reliable estimation of cost and timescale. It contains new dispersers, F/2 fast collimator and so on. Therein, the disperser takes advantage of a special grism and a prism to reduce line density on grating surface, keep wide opening angle of optical path, and get the similar spectrum layout in all three spectral channels. For the fast collimator, it carefully compares on-axis and off-axis designs in throughput, interface to fiber assembly and technical risks. The current progress is more competitive and credible than the previous design, but it also indicates more challenging work will be done to improve its accessibility in engineering.

关键词： Maunakea Spectroscopic Explorer Multi-object Spectrograph High Spectral Resolution Grism

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New tools for the design of freeform mirrors 18

New tools for the design of freeform mirrors

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conference on current developments in Lens design and optical engineering XvIII

作者： Dilworth, Donald C. Opt Syst Design Inc POB 247 East Boothbay ME 04544 USA

ISBN: (纸本)9781510612082;9781510612075

Advances in manufacturing and measuring technology are making the use of freeform mirrors more practical than in the recent past. New degrees of freedom make it possible for designers to improve image quality while increasing the field of view and avoiding obscurations. But other issues arise when one designs a system with several mirrors, particularly packaging and clearance concerns: one must ensure that none of the mirrors gets in the way of the beam from any of the others, and one must consider the coordinate system in which the shapes are defined and in which they are measured, which are not necessarily the same. Addressing these concerns requires new computational tools.

关键词： Freeform aspheric mirrors beam clearance at mirrors

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optical design of an athermalised dual field of view step zoom optical system in MWIR 18

Optical design of an athermalised dual field of view step zo...

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conference on current developments in Lens design and optical engineering XvIII

作者： Kucukcelebi, Doruk Roketsan Kemalpasa Mahallesi Sehit Yuzbasi Adem Kutlu Soka TR-06780 Ankara Turkey

ISBN: (纸本)9781510612082;9781510612075

In this paper, the optical design of an athermalised dual field of view step zoom optical system in MWIR (3.7 mu m-4.8 mu m) is described. The dual field of view infrared optical system is designed based on the principle of passive athermalization method not only to achieve athermal optical system but also to keep the high image quality within the working temperature between -40 degrees C and + 60 degrees C. The infrared optical system used in this study had a 320 pixel x 256 pixel resolution, 20 mu m pixel pitch size cooled MWIR focal plane array detector. In this study, the step zoom mechanism, which has the axial motion due to consisting of a lens group, is considered to simplify mechanical structure. The optical design was based on moving a single lens along the optical axis for changing the optical system's field of view not only to reduce the number of moving parts but also to athermalize for the optical system. The optical design began with an optimization process using paraxial optics when first-order optics parameters are determined. During the optimization process, in order to reduce aberrations, such as coma, astigmatism, spherical and chromatic aberrations, aspherical surfaces were used. As a result, athermalised dual field of view step zoom optical design is proposed and the performance of the design using proposed method was verified by providing the focus shifts, spot diagrams and MTF analyzes' plots.

关键词： Dual field of view step zoom optical design paraxial optics athermalization Mid Wave Infrared (MWIR)

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A lazy way to design infrared lens 18

A lazy way to design infrared lens

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conference on current developments in Lens design and optical engineering XvIII

作者： Qiu, RongSheng Wu, JianDong Chen, LongJiang Yu, Kun Pang, HaoJun Hu, BaiZhen Shanghai Aerosp Control Technol Inst 1555 ZhongChun Rd Shanghai 201109 Peoples R China

ISBN: (纸本)9781510612082;9781510612075

We designed a compact middle-wave infrared (MWIR) lens with a large focal length ratio ( about 1.5:1), used in the 3.7 to 4.8 mu m range. The lens is consisted of a compact front group and a re-imaging group. Thanks to the compact front group configuration, it is possible to install a filter wheel mechanism in such a tight space. The total track length of the lens is about 50mm, which includes a 2mm thick protective window and a cold shield of 12mm. The full field of view of the lens is about 3.6 degrees, and F number is less than 1.6, the image circle is about 4.6mm in diameter. The design performance of the lens reaches diffraction limitation, and doesn't change a lot during a temperature range of -40 degrees C+60 degrees C This essay proposed a stepwise design method of infrared optical system guided by the qualitative approach. The method fully utilize the powerful global optimization ability, with a little effort to write code snippet in optical design software, frees optical engineer from tedious calculation of the original structure.

关键词： infrared optical system lens design athermalization filter wheel multispectral sensing

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Integrated Waveguide Photodetectors with Butt and Evanescent Coupling

Integrated Waveguide Photodetectors with Butt and Evanescent...

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Iranian conference on Electrical engineering (ICEE)

作者： Amir Hossein Mehrfar Morteza Fathipour Department of Electrical Engineering Islamic Azad University Tehran Iran Department of Electrical University of Tehran Tehran Iran

In this paper we report on the design of an integrated waveguide photodetector designed for use in an integrated optical gyroscope with high responsivity and wide bandwidth. The butt and evanescent coupling are two common schemes for the coupling between the waveguide and the photodetector. The butt and evanescent coupling are compared, and a process flow for fabrication of such device is described. At a reverse voltage bias of -1 v, a responsivity higher than 0.6 A/W and 0.5 A/W were obtained for the butt and evanescent coupling respectively, the 3dB cut-off frequency and dark current were 55 GHz and 10 nA for both schemes.

关键词： Photodetectors Couplings Germanium optical waveguides Silicon Dark current Bandwidth

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design of two-dimensional (crossed) grating calculation in Czerny-Turner spectrometer with usage of freeform mirrors 18

Design of two-dimensional (crossed) grating calculation in C...

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conference on current developments in Lens design and optical engineering XvIII

作者： Bazhanov, Yury Demura, Elena Cherkashina, Rasima vlahco, vadim. Corp Precis Syst & Instruments 53 Aviamotornaya Str Moscow 111024 Russia Dynaoptics 8 Boon Lay Way Singapore 609964 Singapore

ISBN: (纸本)9781510612082;9781510612075

The possibility of building a spectrometer based on a flat two-dimensional (crossed) grating is being considered. The most suitable layout for this is the Czerny-Turner, where a spectral image lies in the plane. In this paper an attempt to compensate for the transverse aberrations is made by using a diffraction grating with variable spacing grooves in both sections and aspheric mirror elements of layout, including ones having a freeform surface. Using crossed grating greatly simplifies the device layout and may be particularly effective when used in the ultraviolet and infrared regions of the spectrum, due to a small choice of transmissive materials for manufacturing spectral prisms. This paper gives examples of such case.

关键词： cross-dispersion two-dimensional (crossed) gratings Czerny-Turner spectrometers freeform mirrors

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design of light guide sleeve on hyperspectral imaging system for skin diagnosis 18

Design of light guide sleeve on hyperspectral imaging system...

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conference on current developments in Lens design and optical engineering XvIII

作者： Yan, Yung-Jhe Chang, Chao-Hsin Huang, Ting-Wei Chiang, Hou-Chi Wu Jeng-Fu Mang Ou-Yang Natl Chiao Tung Univ Inst Elect Control Engn Hsinchu Taiwan Natl Chiao Tung Univ Inst Biomed Engn Hsinchu Taiwan Natl Chiao Tung Univ Dept Elect & Comp Engn Hsinchu Taiwan Natl Chung Shan Inst Sci & Technol Taoyuan Taiwan

ISBN: (纸本)9781510612082;9781510612075

A hyperspectral imaging system is proposed for early study of skin diagnosis. A stable and high hyperspectral image quality is important for analysis. Therefore, a light guide sleeve (LGS) was designed for the embedded on a hyperspectral imaging system. It provides a uniform light source on the object plane with the determined distance. Furthermore, it can shield the ambient light from entering the system and increasing noise. For the purpose of producing a uniform light source, the LGS device was designed in the symmetrical double-layered structure. It has light cut structures to adjust distribution of rays between two layers and has the Lambertian surface in the front-end to promote output uniformity. In the simulation of the design, the uniformity of illuminance was about 91.7%. In the measurement of the actual light guide sleeve, the uniformity of illuminance was about 92.5%.

关键词： Light guide Uniform illumination Hyperspectral Image

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Developing of EOS Model with Elliptical Beams for THz Devices

Developing of EOS Model with Elliptical Beams for THz Device...

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International conference on Actual Problems of Electron Devices engineering, (APEDE)

作者： I.A. Navrotsky A.A. Burtsev A.v. Danilushkin T.A. Karetnikova N.M. Ryskin K.v. Shumikhin JSC «SPE “Almaz”» Saratov Saratov Branch of Kotelnikov Institute of Radioengineering and Electronics of RAS

This report presents a design of an electron-optical system (EOS) with triple electron elliptical beams. A current of each beam is 31 mA and a dimension is 300×600 ¼m 2 . A magnetic field of 0,55 T is used for focusing of electron beams. A technology of fabrication and assembly of a model of EOS that contains a dispenser cathode, anode, collector and magnetic system is presented. In the course of experimental investigation of a model in impulse mode total current of 93 mA was obtained at cathode temperature of 1100°C and grid potential 900-1000 v. The realized design of a model with elliptical beams demonstrates the feasibility of creating of THz TWT on the basis of a similar EOS.

关键词： Earth Observing System conferences Cathodes vacuum electronics Electron beam applications Magnetic fields

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