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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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design of an in-vivo microscope to characterize cataracts in human eyes 6

Design of an in-vivo microscope to characterize cataracts in...

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current developments in optical design and engineering vI conference

作者： Feng, C Ahmad, A Univ. of Alabama in Huntsville (United States)

ISBN: (纸本)0819422517

The design of a compact contact microscope, which can be used in-vivo to study the cataracts in human eyes is presented. This microscope has the capability to evaluate the changes in the optical density within the eye lens itself, and thus enabling an examiner to ascertain the progression of a cataractous change or at least the optical changes associated with cataractous development. The microscope has a variable focal length so it can be focused at any depth through the entire thickness of the eye lens. A separate small objective lens is spring loaded against the cornea (like a tonometer tip) so that the natural eye movements can occur safely during the examination. The distance between the objective lens and rest of the optics is variable to accommodate the movements of the eye due to pulse or breathing without affecting the image quality of the instrument. The layer by layer images can be captured on a CCD camera and stored in the computer. The reconstruction software can quantitatively display the characteristics of the cataracts, such as the location, size, and density. The optical design and performance results for the microscope are presented. The optomechanical design features of the microscope are also discussed.

关键词： in-vivo microscope contact microscope eye diseases cataracts CCD imaging

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Study on adjustable displacement parallel beamsplitter 6

Study on adjustable displacement parallel beamsplitter

引用

current developments in optical design and engineering vI conference

作者： Xu, FY Yan, WL Chi, ZT Department of Basic Courses Shandong Architectural Engineering Institute Jinan Shandong 250014 China Department of Physics Qingdao University Qingdao Shandong 266071 China

ISBN: (纸本)0819422517

Beamsplitter is one kind of optical element or apparatus which change one light beam into two or more light beams, and it has been widely used in optical technique. We have ever introduced a series ordinary beamsplitter made by using birefringent crystal. In this article we will introduce a series new type beamsplitter, that is adjustable displacement parallel beamsplitter. We can change one light beam into two parallel light beams, and the displacement between the two parallel light beams can be adjusted by using this type beamsplitter. According to the property of the two parallel light beams, the beamspliter can be divided into two kinds. The first dind, the two light beams both are polarization light beams;the second kind, the two light beams both are nonpolarization light beams. We have discussed their structure character, working principle and using specification in this article.

关键词： beamsplitter parallel light beam birefringent crystal

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design of an F/1.0 spectrograph camera: 'Surfing' the 15 dimensional design space of 1 million optical systems 6

Design of an F/1.0 spectrograph camera: 'Surfing' the 15 dim...

引用

current developments in optical design and engineering vI conference

作者： Radley, A Univ. College London (United Kingdom)

ISBN: (纸本)0819422517

This paper describes a real time optimization method for optical systems. We examine the features of the Global-Opt optical ray tracing program, which has been developed to provide the optical engineer with interactive optimization capabilities. We illustrate the programs main features through the results of design study into a an F/1.0 camera for use in a planned Astronomical spectrograph This instrument is the High Resolution optical Spectrograph (HROS), which is part of the international Gemini project to build twin 8m aperture telescopes towards the end of the decade. The Global-Opt program allows the optical engineer to ray trace, in batch mode, up to 1 million optical systems over a period of several hours. Once complete, the engineer can explore the properties (i.e. aberrations) of these million systems in real time in order to locate the most suitable one for a particular task This is achieved by transferring the multi-dimensional optimization problem into 3 spatial dimensions in which all the aberrations and variable parameters are represented in a 'landscape' visualization. The user is then able to interact with these moving visualizations in order to attempt system optimization. Animation of these visualizations helps the user identify any features present, which directly represent specific attributes of the design form under investigation. We have noted that these moving features resemble water waves, hence the interactive optimization process described here is made analogous to 'surfing'.

关键词： raytracing optimization aberration spectrograph camera interactive virtual reality

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Study on 3.39 mu m laser beam attenuator 6

Study on 3.39 mu m laser beam attenuator

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current developments in optical design and engineering vI conference

作者： Xu, FY Chi, ZT Department of Basic Courses Shandong Architectural Engineering Institute JinanShandong 250014 China Department of Physics Qingdao University Qingdao Shandong 266071 China

ISBN: (纸本)0819422517

Light beam attenuator is one kind of optical element which has been widely used in optical technique. According to beam attenuation principle, it can be divided into two kinds, one is absorbing type attenuator, the other is non-absorbing type attenuator. There has been considerable attention paid to study visible attenuator, but there are few ways to attenuate 3.39 mu m laser beam. In this article we have introduced a series new type 3.39 mu m laser beam attenuator made by suing birefringent crystal. Some is absorbing type attenuator. the other is non-absorbing type attenuator. Such as: two calcite parallel plates type,two yttrium orthovanadate prism type, two yttrium orthovanadate parallel plates plus lambda/2 waveplate type etc.

关键词： attenuator birefringent crystal waveplate prism parallel beamsplitter

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A new design to measure the absolute spectral reflectivity 6

A new design to measure the absolute spectral reflectivity

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current developments in optical design and engineering vI conference

作者： Chen, LY Su, Y Ma, HZ Zhou, SM Wang, Y Qian, YH Physics Department Fudan University Shanghai 200433 China

ISBN: (纸本)0819422517

A new type of the normal incidence scanning reflectometer has been designed and constructed. In the system design, instead of using a reference reflective sample or adjusting the optical path as did in the traditional design, we use a fixed M-type fused quartz prism to split the incidence light source beam into two ones by a total internal reflection configuration. Therefore, these two light beams have the same spot sizes, intensities and spectral response. One beam goes directly to the detector and is used as the incidence reference beam. The second sampling beam goes to the sample first, and then is reflected by the sample with the beam intensity measured finally by the same detector. A metal disk with three holes is driven precisely by a stepping motor and is used to control the reference beam, reflection beam and background signals to be measured in sequence. Afterwards, the absolute reflectivity of the sample at the certain wavelength can be determined immediately by the computer through calculating those three signals. The system is controlled automatically by the computer and worked in a wavelength range from 400 to 800nm under a 5-degree nearly normal incidence angle condition. In the paper, the details of the system design, optical element configuration and error reduction are given and discussed. The measured reflective spectral results for testing samples are also given and shown in good agreement with those measured by other optical method. The system designed in this work, however, is simpler and more reliable to be used in many optical measurements of the sample.

关键词： spectroscopy reflectivity optics

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Double elements monochromatic light depolarizer 6

Double elements monochromatic light depolarizer

引用

current developments in optical design and engineering vI conference

作者： Xu, FY Yan, WL Chi, ZT Shandong Architectural Engineering Institute (China) Qingdao Univ. (China)

ISBN: (纸本)0819422517

Nearly all light sources are partially polarization, the photomulciplier tube,photocell detector and grating have polarization sensitive effect. When we use natural light to do some experiment, the light from the light source must be depolarized. In order to reduce the polarization sensitive effect of the detector, we need fix a depolarizer in front of the detector. Since the times of 1928 year, there has been considerable attention paid to the study of polychromatic light depolarizer. But there are very limited number of ways to depolarize monochromatic light. We have ever introduced some kind of single element structure monochromatic light depolarizer made by using birefringent crystal. In this article we will introduce some kind of double elements structure monochromatic light depolarizer made by using some birefringent crystal and fused silica crystal. We will introduce their structure character, working principle and using specfication in detailed.

关键词： depolarizer monochromatic light birefringent crystal fused sidica

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design and performance of a robust WDM network 6

Design and performance of a robust WDM network

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current developments in optical design and engineering vI conference

作者： vaishnav, C Nieberger, M Jayasumana, AP Sauer, J Colorado State Univ. (United States) Hewlett-Packard Co. (United States) Univ. of Colorado/Boulder (United States)

ISBN: (纸本)0819422517

Increasing number of bandwidth intensive applications demand introduction of concurrency among multiple user transmissions, using techniques such as time division multiplexing (TDM) or wavelength division multiplexing (WDM), to achieve higher aggregate bandwidth. Commercial exploitation of WDM networks, despite their immense potential and promise, find extreme reluctance due to their vulnerability to the wavelength instability of the transmitter sources, and budgetary concerns raised by the inordinate cost of stabilizing them. Robust WDM network uses an intelligent multichannel wavelength tracking receiver that is capable of dynamically accommodating the manufacturing and operating imperfections of the transmitter sources. This yields Robust WDM to be a lucrative option for cost sensitive computer networking markets. In this paper we present Token-based medium access control protocol and network node architecture designed for the demonstration testbed of Robust WDM network. Behavior of average waiting time for a typical connection request on the network is presented using computer simulation.

关键词： optical networks WDM medium access control protocol TDM-based signaling circuit switching node architecture performance simulation delay model

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Tailored edge-ray design for illumination with extended sources 6

Tailored edge-ray design for illumination with extended sour...

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current developments in optical design and engineering vI conference

作者： Rabl, A Gordon, JM Teng, OP Ries, H Winston, R Ecole des Mines (France) Ben-Gurion Univ. of the Negev (Israel) Defence Science Organisation (Singapore) Paul Scherrer Institut (Germany) Univ. of Chicago (United States)

ISBN: (纸本)0819422517

The goal of the optical design of luminaires and other radiation distributors is to attain the desired illumination on the target with a given source. Usually there are constraints that should be satisfied, such as avoiding glare, maximizing the optical efficiency and respecting practical size limitations (not to mention considerations of fabrication costs, availability of materials and esthetics). While the required design procedure is well known for situations where the source can be approximated as a point or as a line, the development of an explicit analytical design method (as opposed to numerical search) for extended sources has begun only a few years ago. A solution for extended isotropic sources can be obtained by establishing a one-to-one correspondence between target points and edge rays, using the tools of nonimaging optics. The designs are called TED (tailored edge-ray designs). Particular solutions have been found in separate papers by Res and Winston(1,2) and by Gordon, Rabl and Ong(3-6). The present paper presents a topological classification of all possible solutions in two dimensions and discusses their general characteristics. We show that any illumination distribution can be obtained exactly in the central region of the target, but in general there will be a certain amount of spillover outside this region. Some flexibility for tailoring designs to specific requirements (size, glare control, etc.) can be gained by the choice of the solution type, the choice of the boundary conditions, and by the use of hybrid configurations that combine several types of solution. The design method is illustrated with specific examples.

关键词： luminaire illumination nonimaging optics glare control reflector design edge-ray extended sources

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Development of a three-channel SWIR camera, for ground-based astronomical imaging. Two Micron All Sky Survey, 2MASS 6

Development of a three-channel SWIR camera, for ground-based...

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current developments in optical design and engineering vI conference

作者： Milligan, S Cranton, BW Skrutskie, MF Telic Optics Inc. (United States) Univ. of Massachusetts/Amherst (United States)

ISBN: (纸本)0819422517

The Two Micron All Sky Survey (2MASS) project, currently underway, requires a camera mated to a 1.3 meter Cassegrain telescope that will simultaneously image the J, H and Ks spectral bands onto three separate NICMOS3 HgCdTe detector arrays. Dichroic beamsplitters allow the three FPA's to view the same field simultaneously. This paper reviews the development of this camera, presents a detailed analysis of the optical design, and discusses the techniques used to align the instrument and evaluate its performance. The low irradiance of astronomical sources, combined with background limited performance of the detectors, mandated a reimaging configuration and the enclosure of the camera optics within the cold volume. Correcting chromatic aberrations, and minimizing ghost images were additional challenges imposed by program requirements. The key to achieving high performance was found to be the selection of lens materials. The final F/3.5 optical design uses fifteen CaF2 elements and four Infrasil elements in an all-spherical configuration. The design is diffraction limited over the full format in the Ks spectral band, and is nearly so in the J and H bands. The tolerance environment is benign, making the design well suited for use in a cryogenic environment. A single channel prototype has been built and extensively field tested at the 50-inch telescope at Kitt Peak National Observatory. Each channel in the multi-spectral camera uses the same optical design successfully demonstrated in the prototype. currently, the first of two three-channel cameras is undergoing lab tests for image quality and channel registration.

关键词： near infrared optical design astronomical imaging chromatic aberration cryogenic camera 2MASS sky survey

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The influence of chemical composition on the refractive index thermal coefficient of liquids 6

The influence of chemical composition on the refractive inde...

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current developments in optical design and engineering vI 1996

作者： Fuller, Joseph B. C. Robb, Paul N. Sigler, Robert D. Abramov, Alexander P. Petrova, Maria v. Plyukhin, Andrey G. Tolstoy, Michael N. Lockheed Martin Palo Alto Research Labs Palo AltoCA94087 United States Vavilov State Optical Institute St. Petersburg Russia

Liquids have been shown to be very effective in the design of apochromatic lenses. The incorporation of abnormal liquids is complicated by their large thermal coefficients of refractive index (dn/dT). To make a glass-liquid design thermally stable, two liquids with different dn/dT and dispersions are typically used. This paper, which extends previously reported investigations of liquid dn/dT dependencies in the visible spectrum (SPIE volume 2512,1995), explores the dependence of dn/dT, abnormal dispersion, and composition for a number of liquids. The optical property measurements were made at the vavilov State optical Institute, St. Petersburg, Russia, in collaboration with the Lockheed Martin Advanced Technology Center, Palo Alto, California. © SPIE.

关键词： Refractive index

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