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共 474 条记录，以下是301-310 订阅

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Design and modeling of XYθ H Type Stage Using 1 Rotational DOF Flexure Joint

Design and modeling of XYθ H Type Stage Using 1 Rotational ...

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2011 International conference on photonics, 3D-Imaging, and Visualization

作者： Kyoungchon Kim Daegab Gweon Namryoung Choi Dongpyo Hong School of Mechanical Aerospace & Systems Engineering Korea Advanced Institute of Science and Technology Department of Mechanical System Engineering Chonbuk National University

ISBN: (纸本)9780819488473

It is important that high precision positioning system to cope with development of semiconductor and FPD manufacturing/inspection procedure. In this paper, the H type stage with flexure joint was proposed to compensate the yaw error in H type stage caused by manufacturing error, assembly error, and synchronous error. To implement the yaw motion in H type stage, 1 rotational DOF flexure joint which has high stiffness and endurance was proposed. Conceptual design of H type stage was performed to follow the criteria for precision machine design. The performance of H type stage was verified by real time experiment.

关键词： H type stage,flexure joint,yaw motion,stage modeling,nano precision

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Prediction of Wastewater Treatment Plants Performance Based on Artificial Fish School Neural Network

Prediction of Wastewater Treatment Plants Performance Based ...

引用

2011 International conference on photonics, 3D-Imaging, and Visualization

作者： Ruicheng Zhang Chong Li College of Computer and Automatic Control Hebei Polytechnic University

ISBN: (纸本)9780819488473

A reliable model for wastewater treatment plant is essential in providing a tool for predicting its performance and to form a basis for controlling the operation of the process. This would minimize the operation costs and assess the stability of environmental balance. For the multi-variable, uncertainty, non-linear characteristics of the wastewater treatment system, an artificial fish school neural network prediction model is established standing on actual operation data in the wastewater treatment system. The model overcomes several disadvantages of the conventional BP neural network. The results of model calculation show that the predicted value can better match measured value, played an effect on simulating and predicting and be able to optimize the operation status. The establishment of the predicting model provides a simple and practical way for the operation and management in wastewater treatment plant, and has good research and engineering practical value.

关键词： Artificial fish school neural network(AFSNN) wastewater plant modeling wastewater treatment

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Characterization of multi-interface, multi-layer, heavily doped Si:P nanostructures using electromagnetic propagation

Characterization of multi-interface, multi-layer, heavily do...

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conference on the Sustainable Design, Manufacturing, and Engineering Workforce Education for a Green Future

作者： Kuznicki, Z. T. Basta, M. Pole API Parc Innovat Photon Syst Lab F-67400 Illkirch Graffenstaden France

ISBN: (纸本)9780819486516

Layered semiconductor structures like delta-dopings and buried amorphizations, where modified optoelectronic features result simultaneously from material composition and device design, can considerably widen optoelectronic applications of conventional materials. Multi-interface novel devices (MINDs) based on a nanoscale Si-layered system buried within a heavily P-doped Si wafer show an unusual reflection, absorption and internal light propagation, which can be dominated by a dense free-carrier gas confined within the surface potential well. First, to simulate the electromagnetic optical response and field propagation, a model of optical functions of the heavily doped Si: P using the Transition Matrix Approach has been constructed. The model uses experimental data published previously for extremely heavily P-doped Si. The dielectric function combines oscillation functions and a dense free-carrier gas (Lorentz-Drude approach) while respecting an inhomogeneous P-doping distribution. Next, an optical model of the real multi-interface device, based on electron microscopy data, has been adapted. A simplified sequence of buried optically active interfaces and corresponding layers (with transformed material and specific refraction indexes) is possible due to a planar (1D) geometry. Finally, the comparison of simulated and experimental reflectivity validates our model.

关键词： Geometrical optics Data modeling Radio propagation Silicon Doping Reflectivity Optoelectronics Silica Wafer-level optics Nanostructures

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Fast MTF and Aberrations Analysis of MWIR and LWIR Imaging systems using Quadri Wave Interferometry

Fast MTF and Aberrations Analysis of MWIR and LWIR Imaging S...

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conference on Infrared Imaging systems - Design, Analysis, modeling, and Testing XXII

作者： Velghe, Sabrina Durand, Emeline Brahmi, Djamel Boucher, William Wattellier, Benoit PHASICS SA F-91128 Palaiseau France

ISBN: (纸本)9780819485885

We present the application of Quadri-Wave Lateral Shearing Interferometry (QWLSI), a wave front sensing technique, to characterize optical beams at infrared wavelengths from 2 to 16 mu m with a single instrument. We apply this technique to qualify optical systems dedicated to MWIR (lambda within 3 and 5 mu m) and LWIR (lambda within 8 and 14 mu m) wavelength ranges. The QWLSI offers the crucial advantage that it yields an analyzed wave front without the use of a reference arm and consequent time consuming alignment. The qualification of an optical system with QWLSI gives a complete diagnostic, from the aberration cartography to the PSF and MTF curves for every direction in one single measurement. In this paper, we first present the QWLSI technology and its main features, we also detail an experimental comparison between our MTF measurement and the results given by a classical MTF test bench. We finally show the experimental analysis of an infrared lens at two different wavelengths, one in the MWIR range (lambda = 3.39 mu m) and the other in the LWIR range (lambda = 10.6 mu m).

关键词： Infrared Thermal Imaging optical Metrology Wave Front Sensing Aberration PSF MTF

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RF-mechanical performance for the Haystack radio telescope

RF-mechanical performance for the Haystack radio telescope

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conference on Optomechanics - Innovations and Solutions

作者： Doyle, Keith B. Brenner, Michael Antebi, Joseph Kan, Frank W. Valentine, Daniel P. Sarawit, Andrew T. MIT Lincoln Lab 244 Wood St Lexington MA 02420 USA Engn Metrol Serv Lexington KY USA Simpson Gumpertz & Heger Inc Waltham MA USA

ISBN: (纸本)9780819487353

The Haystack radio telescope is being upgraded to support imaging radar applications at 96 GHz. The Cassegrain antenna includes a 37 m diameter primary reflector comprising 432 reflector panels and a 2.84 m diameter hexapod mounted subreflector. Top-level antenna performance is based on meeting diffraction-limited performance over an elevation range of 10 - 40 degrees resulting in a maximum RF half pathlength error requirement of 100 mu m RMS. RF-mechanical performance analyses were conducted that allocated subsystem requirements for fabrication, alignment, and environmental effects. Key contributors to system level performance are discussed. The environmental allocations include the effects of gravity, thermal gradients, and diurnal thermal variations which are the dominant error source. Finite element methods and integrated optomechanical models were employed to estimate the environmental performance of the antenna and provide insight into thermal management strategies and subreflector compensation. Fabrication and alignment errors include the manufacturing of the reflector surface panels and assembly of overall reflector surface.

关键词： radio telescope integrated modeling thermal-structural-optical analysis RF error finite element analysis metrology alignment optomechanical analysis

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Design of complex large-scale photonic integrated circuits (PICs) based on ring-resonator structures

Design of complex large-scale photonic integrated circuits (...

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conference on Physics and Simulation of Optoelectronic Devices XIX

作者： Arellano, C. Mingaleev, S. Sokolov, E. Koltchanov, I. Richter, A. VPIsyst Carnotstr 6 D-10587 Berlin Germany VPI Dev Ctr Minsk 220034 BELARUS

ISBN: (纸本)9780819484703

The exponentially growing number of components in complex large-scale Photonic Integrated Circuits (PICs) requires the necessity of photonic design tools with system-level abstraction, which are efficient for designs enclosing hundreds of elements. Ring-resonators and derived structures represent one example for large-scale photonics integration. Their characteristics can be parameterized in the frequency-domain and described by scattering matrix (S-matrix) parameters. The S-matrix method allows time efficient numerical simulations, decreasing the simulation time by several orders of magnitude compared to time-domain approaches yielding a better modeling accuracy as the number of PIC elements increases. We present the modeling of optical waveguides within a sophisticated design environment using application examples that contain ring-resonators as fundamental structure. In the models, the two orthogonally polarized guided modes are characterized by their specific index and loss parameters. systematic variation of circuit parameters, such as coupling factor or refractive index, allows a comfortable design, analysis and optimization of many types of complex integrated photonic structures.

关键词： photonic integrated circuit ring resonator ring coupler photonic waveguide scattering matrix design modeling photonic integration

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Documentation generator for VHDL and Matlab source codes for photonic and electronic systems

Documentation generator for VHDL and Matlab source codes for...

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conference on optical Fibers and Their Applications 2011

作者： Niton, B. Pozniak, K. T. Romaniuk, R. S. Warsaw Univ Technol Inst Elect Syst Warsaw Poland

ISBN: (纸本)9780819485847

The UML, which is a complex system modeling and description technology, has recently been expanding its uses in the field of formalization and algorithmic approach to such systems like multiprocessor photonic, optoelectronic and advanced electronics carriers;distributed, multichannel measurement systems;optical networks, industrial electronics, novel R&D solutions. The paper describes a new concept of software dedicated for documenting the source codes written in VHDL and MatLab. The work starts with the analysis of available documentation generators for both programming languages, with an emphasis on the open source solutions. There are presented own solutions which base on the Doxygen program available as a free license with the source code. The supporting tools for parsers building were used like Bison and Flex. The documentation generator application is used for design of large optoelectronic and electronic measurement and control systems. The paper consists of three parts which describe the following components of the documentation generator for photonic and electronic systems: concept, MatLab application and VHDL application. This is part one which describes the system concept. Part two describes the MatLab application. MatLab is used for description of the measured phenomena. Part three describes the VHDL application. VHDL is used for behavioral description of the optoelectronic system. All the proposed approach and application documents big, complex software configurations for large systems.

关键词： optical networks large electronic and optoelectronic systems documentation source codes VHDL Matlab Doxygen UML MatLab algorithms for large functional systems VHDL description of complex systems photonics applications software for photonics and electronics systems

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Using MapleSim to model a six-strut kinematic mount for aligning optical components

Using MapleSim to model a six-strut kinematic mount for alig...

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conference on Advances in Computational Methods for X-Ray optics II

作者： Duffy, Alan Yates, Brian Hu, Yongfeng Canadian Light Source Inc Saskatoon SK S7N 0X4 Canada

ISBN: (纸本)9780819487513

Ray tracing simulations are often performed for an ideal situation of perfect alignment, but it is usually necessary to move optical components for various reasons. The mounts that hold these components can be complicated and modeling their motion is vital to understanding how they affect the performance of the system. This paper examines the behaviour of a six-strut kinematic mount using MapleSim to investigate and understand precisely how a mirror pole moves with its mount and quantify any cross-coupled motion that may occur during actuator adjustments. This positional information can be used to mitigate errors, improve ray tracing results, and assist in alignment.

关键词： MapleSim kinematic mount closed kinematic loop alignment ray tracing

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Method of adjusting an optical axis of receiving module of laser rangefinder to the main axis of a space vehicle

Method of adjusting an optical axis of receiving module of l...

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conference on modeling Aspects in optical Metrology III

作者： Ershov, Alexandr G. Russian Federat State Sci & Mfg Corp SI Vavilov State Opt Inst St Petersburg 199034 Russia

ISBN: (纸本)9780819486790

A new method of adjusting an optical axis of the lens of the receiving module (RM) of a laser rangefinder (LRF) [1] to the main axis of a space vehicle is described. The testing unit for the LRF was designed and described before [2]. The unit allows to measure the focal plane position of the main lens, the RM detectivity, the level of nonaxis source of light, the transmittance of optical system and the dynamic range of the RM and to make most of adjustings. The uncertainty of adjusting the four laser beams to the main axis of the space vehicle consists of the uncertainty of adjusting the optical axis of the RM to the main axis of the space vehicle, the uncertainty of adjusting the central fiber of fiber-optic coupler (FOC) RM to the optical axis and the uncertainty of adjusting the laser beams of the laser transmitter module (LTM) to all of four fibers of the FOC RM. The method and uncertainty of adjusting an optical axis of the RM to the main axis of a space vehicle is determined as +/- 45 arcsec and described in this paper.

关键词： optical metrology calibration alignment adjusting

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Inverse calculation of position and tilt errors of optical components from wavefront data

Inverse calculation of position and tilt errors of optical c...

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conference on modeling Aspects in optical Metrology III

作者： Gilbergs, H. Wengert, N. Frenner, K. Eberhard, P. Osten, W. Univ Stuttgart Inst Appl Opt Pfaffenwaldring 9 D-70569 Stuttgart Germany Univ Stuttgart Inst Engn & Computat Mech D-70569 Stuttgart Germany

ISBN: (纸本)9780819486790

High performance optical systems pose very strict limits to positioning errors of the optical components inside the system. Identification and suppression of static and dynamic errors, like alignment errors due to drift or structural vibrations, can lead to superior imaging quality. A concept is presented that allows for intra process monitoring of deviations of a lens from its ideal position. It can track the movement of a lens by illumination through the rim such that the light reflects of the optical surfaces of the lens by total internal reflection before exiting the lens on the opposite side. A Shack-Hartmann wavefront sensor is applied to detect the wavefront. The wavefront-error caused by decenter or tilt of the lens is used for the reconstruction of the geometrical perturbations. Two approaches for the reconstruction of the geometrical properties from forward calculation data (model-based and regularization methods) are compared. Different light sources and geometrical setups can have an effect on the wavefront properties. A comparison is made to investigate their influence on the reconstruction quality. As the measurement principle does not interfere with the imaging process of the system, the method should be able to monitor the system during operation. This could enable real time tracking of errors up to the sampling rate of the detector making the method suitable for measurements of system dynamics. The method can potentially be enhanced to detect some lens deformations in combination with mechanical finite element simulation.

关键词： Inverse problems parameter estimation position measurement total internal reflection wavefront errors alignment errors simulation

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