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检索条件"任意字段=Current Developments in Optical Design and Optical Engineering 1991"

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Proceedings of SPIE: current developments in Lens design and optical engineering III

Proceedings of SPIE: Current Developments in Lens Design and...

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current developments in Lens design and optical engineering III

This Volume 4767 of the conference proceedings contains 19 papers. Topics discussed include optical system, optical sensors, optical materials, optical design and optical devices.

关键词： optical engineering

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Integral optical system design of injection molded optics

Integral optical system design of injection molded optics

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Conference on current developments in Lens design and optical engineering IV

作者： Bäumer, S Shulepova, L Willemse, J Renkema, K Philips High Tech Plast NL-5503 LP Veldhoven Netherlands

ISBN: (纸本)0819450464

Injection molded optics are frequently applied in many high volume applications. Bar code scanners.. CD / DVD systems, CMOS cameras are a few examples. In all of these applications cost effective and fast design cycles are essential. At Philips High Tech Plastics we developed a design system that touches on all different aspects of the system design. Starting with traditional lens design (sequential ray tracing) and tolerancing we transport the initial design into mechanical solid modeling. During mechanical modeling, tolerances, injection molding design rules and integration of mechanical features, reference marks, etc. are incorporated as well. Here the full advantage of injection molding can be utilized. After the opto - mechanical modeling the system is ported back to non - sequential ray tracing for ghost - and stray light analysis. Finally extended tolerancing is performed in order to come to a robust high volume product. If necessary all or several steps in this design process are repeated in order to arrive at the final design. As an additional requirement the metrology possibilities for the design are checked at an early stage. This integral system approach to optical design, including optical modeling (sequential and non-sequential) combined with mechanical solid modeling is presented using some recent examples.

关键词： injection molding imaging optics optics design

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A new method to treat a spherical lens as a combination of two perpendicular lengthless cylindrical lenses in ray tracing

A new method to treat a spherical lens as a combination of t...

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Conference on current developments in Lens design and optical engineering IV

作者： Al-Ali, LS Rasheed, KH Ajman Univ Sci & Technol Ajman U Arab Emirates

ISBN: (纸本)0819450464

We present a new suggestion for treating skew rays. In the new suggestion. we hypothetically divide a spherical lens. at each point of intersection of the incident rays with the spherical lens. into two effective perpendicular lengthless cylindrical lenses. One of the hypothetical cylindrical lenses is effective in the vertical direction while the other is effective in the horizontal direction. A method is given for calculating the resulted vertical and horizontal angles of refraction. After calculating these angles one can combine. at that point of incidence. the two components into a vector sum to find the resultant refracted ray. The new suggested method is first discussed and demonstrated for one single lens. and then generalized to optical systems of many components. The method's power and effectiveness in lens and optical systems design is demonstrated. A software package is designed and written for the purpose of optical ray tracing. The new method is implemented in this software. The name we gave to this package is "CALOSD". CALOSD is an acronym for Computer Aided Lens and optical Systems design. CALOSD is capable of producing very accurate tabulated data as well as graphical displays of an optical system and rays traced from different points or angles of view: including a top view.

关键词： lens design ray tracing meridian and skew rays approximate and exact methods

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optical design and tolerances of wide field imagers for astronomical survey

Optical design and tolerances of wide field imagers for astr...

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Conference on current developments in Lens design and optical engineering IV

作者： Thibault, S Lacoursière, J Doucet, M Wang, M Reecht, J INO St Foy PQ G1P 4S4 Canada

ISBN: (纸本)0819450464

We present three designs and tolerances of wide-field imagers (30x30 arc-minutes or larger) for astronomical surveying. Two infrared cameras (CPAPIR and PANORAMIX II) were designed for the 0.8-2.4 mum band and a third one (WIRCAM) for the visible and near-infrared band extending from 410 nm to 950 nm. The cameras are installed on the telescopes of the Canada-France-Hawaii (Hawaii, USA) and Mont Megantic Observatories (Quebec, Canada). The three cameras are compact, use only spherical refractive components and have an internal pupil accessible for insertion of filtering components. A Lyot stop must be used in the infrared camera for background rejection. For PANORAMIX II, a set of filters is used at the internal pupil. Correction of the large off-axis aberrations generated by the telescopes, wide spectral coverage, material choices, cryogenic temperature and alignment were the main design challenges. Also, tolerancing was particularly critical for the infrared cameras because they are cryogenically cooled, thus forbidding adjustment of internal components. The cameras theoretical performances are presented in terms of point-spread function, encircled energy and distortion.

关键词： optical design wide field focal reducer broadband astronomical survey catadioptric

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Structured design method for automotive lamp reflectors

Structured design method for automotive lamp reflectors

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Conference on current developments in Lens design and optical engineering IV

作者： Sikkens, M Nuyens, P Philips Ctr Ind Technol Ind Opt Grp NL-5600 MD Eindhoven Netherlands

ISBN: (纸本)0819450464

The design of critical automotive lamp reflectors, e.g. headlamps and fog lamps, is dominated by trial-and-error methods and rules-of-thumb, supported by optical ray-tracing tools like ASAP etc. In many cases these reflectors are designed by aiming small sections to construct the required illumination distribution, which is a time-consuming task and in which case it is very difficult to maintain a continuous reflector surface. The design method presented here is a more structured approach in which the total available front surface is divided in a few relatively large sections, each section designated to produce a certain part of the required light distribution. An optimizing algorithm is used to optimize the separate polynomial reflector sections in combination with a specific burner. In the final step, the separate sections are put together to form a more-or-less continuous reflector surface. Some iteration afterwards is still required because the intersection lines of the polynomial surfaces will generally change the original section boundaries. The design of a front fog reflector lamp is used as a carrier to demonstrate the approach. Three reflector sections are used to design a high-efficiency fog lamp. The light distribution has an excellent horizontal cut-off that basically meets the SAE requirements.

关键词： reflector design lamps automotive head lamp fog lamp optimization

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Comparison of the Measured and Analytical Response Profiles of a 3.3 to 15.5 μ Imaging System and the Effect of Detector Diffusion

Comparison of the Measured and Analytical Response Profiles ...

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current developments in Lens design and optical engineering IV

作者： Bruce Jr., C.F. Jet Propulsion Laboratory California Institute of Technology Pasadena CA 91109

This paper provides an overview of the Tropospheric Emission Spectrometer (TES) and its mission, as a part of NASA's Earth Observing System (EOS). The design of the re-imaging system and its detectors and the test set-up used to characterize the field of view response will be presented. Measured system optical response profiles will be presented for each of the four infrared spectral bands (3.5-5.3, 5.1-9.1, 8.3-12.2 and 11.1 - 15.4 μ) supported by TES. Specific emphasis will be placed upon the comparison of these measured optical response functions with the results of an analytic model of the response. The model includes a simple yet accurate representation of the detector response function, which includes the photo-generated electron's diffusion length.

关键词： optical systems

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design of an imaging VISAR diagnostic for the national ignition facility (NIF)

Design of an imaging VISAR diagnostic for the national ignit...

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Conference on current developments in Lens design and optical engineering IV

作者： Malone, RM Frogget, BC Kaufman, MI Watts, PW Bell, PM Celester, JR Bechtel Nevada Los Alamos NM 87544 USA

ISBN: (纸本)0819450464

The National Ignition Facility (NIF) requested an optical diagnostic for measuring shock velocities, shock breakout times, and shock emission of objects with sizes of I to 10 mm. For the polar port of the target chamber, an 8-inch triplet lens collects light at f/3 inside a 30-foot-diameter vacuum chamber and uses an optical relay to send the image into two interferometers located at a distance of 160 feet. Light propagates through a VISAR (Velocity Interferometry System for Any Reflector) interferometer employing a Mach-Zehnder configuration. After exiting the interferometers the images are recorded, both by streak cameras and CCD gated imagers. Discrete magnification changes are accomplished by swapping out optical elements. Large dove prisms are used to rotate the image to align a selected region of the object with the slits of the streak cameras. Unique mounting structures are required to remotely control the alignment of the optical axis. Finite Element Analysis (FEA) was performed on all mounting structures. The first 8-inch triplet can be no closer than 500 mm from the target chamber center and is protected by a blast window that has to be replaced after every event. The first several lens groups have to be fused silica for radiation resistance. A frequency-doubled Nd:YAG laser, operating at 659.5 nm, is used to illuminate the moving object. The VISAR laser wavelength had to be different than the first, second, and third harmonics of the NIF drive lasers.

关键词： optical relay interferometer national ignition facility (NIF) VISAR streak camera

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Semiconductor quantum devices for optical tomography 3

Semiconductor quantum devices for optical tomography

引用

3rd World Congress on Industrial Process Tomography

作者： Ozanyan, Krikor B. Department of Electrical Engineering and Electronics UMIST PO Box 88 ManchesterM60 1QD United Kingdom

ISBN: (纸本)9780853163190

This review examines recent developments in low-dimensional semiconductor devices and their impact on modalities for optical Tomography. The current state-of-the-art in semiconductor optoelectronic materials is taken as basis to show that the design of multi-layer quantum devices can span a much wider functionality range than has been possible in the past. The basic principles of design and operation of some quantum optoelectronic devices are outlined, with emphasis on achievable flexibility to match the specific needs in the area of optical monitoring. It is shown, that opportunities to engineer required essential properties, such as spectral tunability of laser diode emission and spectral sensitivity of photoreceivers, are superior for quantum *** detailed examples are given in the mid-IR spectral range, the quantum-cascade laser (QCL) and the quantum-well infrared photodetector (QWIP). Their application to modalities for mid-IR gas monitoring is reviewed. It is argued that despite the functionality of those two devices being substantially different, future achievements in the performance of both will be largely sensitive to breakthroughs in one and the same field, e.g. the growth technology of quantum structures. © 2003 International Society for Industrial Process Tomography.

关键词： optical tomography

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Network processor design: issues and challenges

Network processor design: issues and challenges

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IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： F. Khunjush M.W. El-Kharashi K.F. Li N.J. Dimopoulos Department of Electrical and Computer Engineering University of Victoria Victoria BC Canada

Since the deployment of the ARPANET in the 60s and the local area networks, Intranets, and the Internet in the 70s and 80s, research investigation and commercial product developments have focused on network infrastructures such as fiber trunks, routers, and switches, as well as OSI layers 2 and 3 protocol equipment. Recently, in response to the increasing complexity of the communication protocols and exploding demand for functionalities in network active components, chip manufacturers and researchers recently shifted their effort to the design and implementation of NPUs (network processing units). This work investigates the characteristics and properties of network applications and protocols. Understanding the requirements of these applications and protocols enables the formulation of the overall objectives and specifications in the design of NPUs. Some of the existing commercial products are surveyed and their functional objectives and design approaches are examined. We conclude with the current status of NPU development. Immediate challenges in design and implementation of NPUs, with respect to the rapid network expansion and increasing traffic demand, are also discussed.

关键词： Process design Protocols ARPANET Local area networks IP networks Product development optical fiber communication optical fiber devices optical fiber LAN Switches

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optical design of a reflectance/Raman confocal microspectrometer

Optical design of a reflectance/Raman confocal microspectrom...

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Conference on current developments in Lens design and optical engineering III

作者： Mouroulis, P CALTECH Jet Prop Lab Pasadena CA 91109 USA

ISBN: (纸本)0819445347

A miniaturized instrument for systematic planetary mineralogy is presented, and the optical design of the component parts is discussed. The instrument combines the following capabilities: wide field color imaging, confocal imaging at two different resolution/range levels, reflectance spectroscopy in the 400-2500 nm region with a resolution of 10 nm, and Raman spectroscopy over 4000 cm(-1) with an average resolution of 3.3 cm(-1). The instrument can also serve as an expandable platform for adding fluorescence spectroscopy, or for examining samples from a distance of several meters while using the same spectrometer.

关键词： optical design confocal microscopy planetary mineralogy reflectance spectroscopy Raman spectroscopy

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