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

共 530 条记录，以下是391-400 订阅

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lens centering by using binary phase grating

Lens centering by using binary phase grating

引用

conference on current developments in lens design and optical systems engineering

作者： Lu, ZW Weng, ZC Changchun Inst Opt & Fine Mech State Key Lab Appl Opt Changchun 130022 Peoples R China

ISBN: (纸本)0819437387

By using a binary phase grating, a lens centering system is constructed. In our system, the lens under alignment is mounted on a suitable mechanical axis that can be a spindle of precision lathe. A binary phase grating is used as a beam splitter. Laser beam after passing through the grating only +/- 1 orders are kept unstop, reflected back by lens surface, recombined by the same grating, and very good contrast interference fringes can be attained. When the lens together with the spindle is rotated, the interference fringes remain motionless only when the lens rotates around its axis of symmetry. If the lens rotates around an axis of asymmetry, the fringes will move. A CCD camera is used to monitor the fringes and transversal error less than a micrometer can be achieved. The interference fringes are very insensitive to vibration and environment. In the paper the theory are presented and the experimental results are given.

关键词： centering interference binary phase grating

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Calculation of diffraction in the presence of aberrations by numerical methods based on critical points and semi-periodic zones

Calculation of diffraction in the presence of aberrations by...

引用

conference on current developments in lens design and optical systems engineering

作者： Ferré-Borrull, J Bosch, S Univ Barcelona Dept Fis Aplicada & Opt E-08028 Barcelona Spain

ISBN: (纸本)0819437387

The numerical calculation of diffraction integrals in systems with aberrations is addressed from the point of view of a new geometrical interpretation of the diffraction phenomena. This interpretation is based on the division of the integration domain in semiperiodic zones that isolate the integrand oscillations. Moreover, the critical points of the aperture allow to identify the zones with a net contribution to the diffracted field. With the help of this interpretation it is possible to define methods for calculating the diffraction of a spherical wave incident on an aperture. We study the problems that arise when these methods have to be applied to waves in aberrated systems and we propose a solution based on the analysis of the behavior of the optical path of the wave incident on the exit pupil of the system.

关键词： diffraction integrals semi-periodic zones critical points aberrated optical systems

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Opto-mechanical design of primary mirror assembly for free gyro stabilized seeker

Opto-mechanical design of primary mirror assembly for free g...

引用

conference on current developments in lens design and optical systems engineering

作者： Perona, BJ Yarbrough, C Prill, S Raytheon Missile Syst Co Tucson AZ 85710 USA

ISBN: (纸本)0819437387

In Free Gyroscopic Stabilized Seekers, the Primary Minor has the multiple functions of a magnetic rotor, the primary rotating mass and the primary reflector for the optical train. The introduction of rare-earth magnetic alloys to this class of seeker has provided increased flexibility in materials selection, opto-mechanical design and cost of manufacture. Along with superior magnetic properties, the rare-earth alloy Neodymium-Iron-Boron (NdFeB) comes with the undesirable properties of anisotropic CTE, high susceptibility to corrosion and manufacturing challenges. This paper discusses the opto-mechanical design, structural and optical modeling and analysis of a primary mirror assembly utilizing an NdFeB insert with centrifugal, linear acceleration and thermal loading as well as the optical test results, qualification testing of long-term figure stability and validation of the mechanical/magnetic/optical design model.

关键词： opto-mechanical design gyroscope rare-earth magnet

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Optimization and fabrication of micro diffractive lens arrays for biochip application

Optimization and fabrication of micro diffractive lens array...

引用

conference on current developments in lens design and optical systems engineering

作者： Yang, R Pang, L Wu, MX Jin, GF Tsing Hua Univ Dept Precis Instrument State Key Lab Precis Measurement Technol & Instru Beijing 100084 Peoples R China

ISBN: (纸本)0819437387

In the latest ten years, great efforts have been taken to miniaturize the biochemical and chemical analysis systems, and many kinds of biochips with functions of biology sample preparing, chemical assay reacting and result detecting, or mixture of some of these functions have been reported. An aspherical micro lens array with large numerous aperture is developed for a biosensor to achieve high fluorescence collection and high sensitivity. The optimized design and fabrication with new organic-inorganic sol-gel materials of micro lens arrays are discussed in this paper. Because of merits of micro size, low cost, facility to reproduce, flexibility to design and multi-channels detection, these elements are suitable to form a compact, multi-channel fluorescence biosensor that can address multiple biology samples simultaneously without loss in detection sensitivity. Packaging and alignment strategies for a sensor consist of micro lens arrays detecting fluorescence labeled DNA assay arrays are also presented, which is promising to be integrated into a micro total analysis system (u-TAS).

关键词： micro lens arrays organic-inorganic sol-gel biosensor u-TAS

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optical design of SHASM: Segmented hexagon array solar mirror

Optical design of SHASM: Segmented hexagon array solar mirro...

引用

conference on current developments in lens design and optical systems engineering

作者： Huegele, VB NASA George C Marshall Space Flight Ctr SOMTC Huntsville AL 35812 USA

ISBN: (纸本)0819437387

A segmented array of mirrors was designed for a solar concentrator test stand at MSFC for firing solar thermal propulsion engines. The 144 mirrors each have a spherical surface to approximate a parabolic concentrator when combined into the entire 17-foot diameter array. The mirror segments are aluminum hexagons that had the surface diamond turned and quartz coated. The array focuses sunlight reflected from a heliostat to a 4 inch diameter spot containing 8 kilowatts of power at the 15 foot focal point. The derivation of the surface figure for the respective mirror elements is shown. The alignment process of the array is discussed and test results of the system's performance are given.

关键词： segmented mirror array spherical approximation solar thermal propulsion solar power

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Assessment, optimization, and tolerancing methods for visual instruments

Assessment, optimization, and tolerancing methods for visual...

引用

conference on current developments in lens design and optical systems engineering

作者： Deslis, A Mouroulis, P Davidson Optron Inc W Covina CA 91790 USA

ISBN: (纸本)0819437387

A strategy for optimizing both the on-axis and the off-axis performance of coherently (directly) coupled visual instruments is presented. The strategy draws on the recently published body of data regarding the influence of various individual Seidel aberration and aberration combinations on subjective contrast sensitivity and resolution tasks, as well as studies on the correlation between subjective image quality and objective instrumental figures of merit. An MTF-based metric allows both optimization and tolerancing to be performed in a coherent manner that is based on experimental results of the effects of aberrations.

关键词： optimization visual systems optical design tolerancing MTF

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Diffractive optical systems adapted for the outer space operation

Diffractive optical systems adapted for the outer space oper...

引用

conference on current developments in lens design and optical systems engineering

作者： Constantinov, B Pasechnic, T Sircu, S State Univ Moldova Dept Phys MD-2009 Chisinau Moldova

ISBN: (纸本)0819437387

Present paper considers a technique of diffraction element microminiaturization in the process of optical data recording onto photothermoplastic films (PTPFs) by using the photothermoplastic recording (PTPR) equipment adapted for outer space. It has been found that the application of surface - active substances (SAS) onto the free surface of PTPF facilitates the appearance and evolution of microdiffraction optical systems (whose period doesn't exceed 1 mum) on the profile of basic diffraction elements (with a period < 5 m). Miniature dimensions of microdiffraction elements provide high resolution without loss in diffraction efficiency, as the dimensions, shape (depth) of a diffraction element actually depend not only on the thickness of the visualising layer but also on SAS properties, namely on the dielectric and physical - chemical properties and, particulary, on the ability of SAS to influence onto the surface tension. The shift in the flow point of the visualising layer material provides the increase both in the diffraction efficiency and resolution at the expense of discretization of the surface diffraction elements into 2, 4, 6, ... microdiffraction elements.

关键词： photothermoplastic films surface - active materials resolution diffraction efficiency

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Simulation of the optical transmission in 3-D imaging systems based on the principle of time-of-flight

Simulation of the optical transmission in 3-D imaging system...

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conference on current developments in lens design and optical systems engineering

作者： Tai, W Schwarte, R Heinol, H Univ Siegen Inst Nachrichtenverarbeitung D-57068 Siegen Germany

ISBN: (纸本)0819437387

A time-of-flight (TOF) system based on a novel Photonic Mixer Device (PMD), which detects and demodulates light simultaneously, has demonstrated that it is feasible to realize a 3-D imaging system with compactness, low cost and sufficient resolution for many applications. Active illumination is used in the TOF imaging system. Because of the limited available light source with large bandwidth and in consideration of eye safety, LEDs or low power laser diodes are used as preferable Light sources. The received light may be strongly damped in an order of 40-50dB, depending on the surface characteristics of the objects. Therefore the optical transmission in the light transmission chain of light source - sender lens - object - receiver lens - (PMD) detector array need to be simulated and optimized in order to achieve better performance and maximal power transmission, by the design of such a 3-D camera. Based on the modeling of the light source (laser diodes and LEDs), lens system and statistical characteristics of objects one is able to simulate the light transmission and the light distribution on the object and the PMD detector array. By the use of time-of-flight of the sensing light it is necessary to beep the phase uniformity of the illumination light, because every detector can possibly receive light from different light ways. This would result in a reduction of detection resolution. The optical-path-differences (OPD) representing the time differences from different paths have been simulated from the source to the related pixel for the designed transmitter lens and the receiver lens. Only one source is usually used by direct current modulation of laser diode or LED for uniform modulation phase. The simulation of the light distribution has given estimation of the light gathering efficiency of every pixel and of possible crosstalk between adjacent pixels.

关键词： 3-D imaging time-of-flight optical transmission Photonic Mixer Divice (PMD)

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Software for tolerance analysis of optical systems

Software for tolerance analysis of optical systems

引用

conference on current developments in lens design and optical systems engineering

作者： Schuhmann, R Adams, G LINOS Photonics GmbH (Germany) The Optical Software Co. (United Kingdom)

ISBN: (纸本)0819437387

A new program for the tolerancing of optical designs is presented. This software was developed using a combination of theoretical understanding and practical experience. A comprehensive sensitivity analysis provides insight into the key parameters. Tolerance editors allow the user to define satisfactory tolerances in an interactive process involving parameter and defect variations;a key feature is the statistical prediction of system performance, which provides rapid feedback on the impact of any change. The production of a batch of optical systems under the current tolerances can be modelled in a Monte Carlo simulation;the resultant aberration variations are shown in multiple dynamic graphs.

关键词： Tolerancing Cameras Modulation transfer functions Monte Carlo methods Statistical analysis Error analysis Monochromatic aberrations Chromatic aberrations Image quality Software development

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Quantifying the dynamics of lithography tool support systems

Quantifying the dynamics of lithography tool support systems

引用

conference on current developments in lens design and optical systems engineering

作者： Mootz, DD Barada, AH Nikon Precis Inc Belmont CA 94002 USA

ISBN: (纸本)0819437387

Optimum performance of a scanning photolithography tool is highly dependent upon the characteristics of its installation support system. Since the quality of the imaging product relies on precise control of the imaging process, vibration management is critical. Stiffness, mass, and inherent damping of the overall support system are the primary factors in determining whether the equipment is able to provide good process control under varied operating conditions. current generation lithography scanners employ internal reaction forces to ultimately stabilize their optical exposure systems. These reaction forces are generated in order to counteract dynamic acceleration forces resulting from stages, wafer loaders and other devices and can transmit relatively large dynamic loads into the support system. In addition to withstanding the static weight of the tool, the support system must also resist these dynamic loads. Although there are several techniques for establishing the integrity of a support system, this paper will discuss a method for gauging how a system reacts dynamically to the loads generated by a scanning lithography tool. By computing the transfer function of acceleration divided by force, a dynamic measurement term called accelerance is used to quantify the integrity of the pedestal support system on which the tool resides.

关键词： accelerance dynamic loads pedestal vibration

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