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A novel approach for structural synthesis of zoom systems

A novel approach for structural synthesis of zoom systems

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conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Hazra, L. N. Pal, S. Univ Calcutta Dept Appl Opt & Photon Kolkata India

ISBN: (纸本)9780819482822

A new approach for 'ab initio' synthesis of thin lens structure of zoom lenses is reported. This is accomplished by an implementation of evolutionary programming, based on Genetic Algorithm, which explores the available configuration space formed by powers of individual components and inter-component separations. Normalization of the variables is carried out to get an insight on the optimum structures. The method has been successfully used to get thin lens structures of mechanically compensated, optically compensated, and linearly compensated zoom lens systems by suitable formulation of merit function of optimization. Investigations have been carried out on three component and four component zoom lens structures. Illustrative numerical results are presented.

关键词： optically compensated zoom lenses mechanically compensated zoom lenses evolutionary programming genetic algorithm thin lens design

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Accelerating diffractive optics design with GPU-based parallel technique

Accelerating diffractive optics design with GPU-based parall...

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conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Liu, Kan Li, Hui Zhang, Xinyu Li, Dehua Wei, Mingyue Li, Bin Xie, ChangSheng Zhang, Tianxu Huazhong Univ Sci & Technol Inst Pattern Recognit & Artificial Intelligence State Key Lab Multispectral Informat Proc Technol Wuhan 430074 Hubei Peoples R China Wuhan Natl Lab Optoelect Wuhan 430074 Peoples R China

ISBN: (纸本)9780819482822

In this paper GPU based data parallel technique is used to reduce calculating time in diffractive optics elements (DOE) design. By using compute unified device architecture (CUDA) framework, comparison of acceleration radio of some major methods using in DOE design, including Gerchberg Saxton algorithm for global optimization in conjunction with Rayleigh-Sommerfeld diffractive integrating transformation, genetic algorithm with a finite-difference time-domain method and simulated annealing algorithm, is made with demonstrational DOE-lens design, whose focal spot size is 0.5 mu m, incident light wavelength is 650 nm, focal length is 3mm, DOE aperture size is 2mm.

关键词： DOE design GPU acceleration CUDA Algorithm comparison

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The design and fabrication of telecentric lens with large field of view

The design and fabrication of telecentric lens with large fi...

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conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Chang, Chun-Li Huang, Kuo-Cheng Wu, Wen-Hong Lin, Yi-Hung Natl Appl Res Labs Instrument Technol Res Ctr Hsinchu Taiwan Natl Pingtung Univ Sci & Technol Dept Engn Mech Pingtung Taiwan

In ultra-precision (distortion 100 mm). Based on the concept of equivalent design in optical tolerances, the lens module can be designed readily into a telecentric system, which consists of five spherical lenses and a... 详细信息

ISBN: (纸本)9780819482822

In ultra-precision (distortion <0.5%) vision inspection system, the accuracy of measurement depends on sharpness and distortion of image. The telecentric lens provides distortion-free and constant magnification (within depth of field) image, so it has become an indispensable key module in the amount of visual measuring system. The article presents a design and development of telecentric lens module for the wide range of vision inspection system (field-of-view >100 mm). Based on the concept of equivalent design in optical tolerances, the lens module can be designed readily into a telecentric system, which consists of five spherical lenses and a glass molded aspheric lens. In order to correct image distortion, an aspheric lens would be added to the telecentric system. The experiment shows that the distortion can be reduced from 1.5% to 0.34% and the depth of field (DOF) is also improved up to 28.3 mm.

关键词： telecentric lens machine-vision aspheric lens equivalent tolerance

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The development of intelligent pressure transmitter based on HART protocol

The development of intelligent pressure transmitter based on...

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International conference on E-Health Networking Digital Ecosystems and Technologies

作者： Zeng, Mingru You, Wentang Qian, Xin School of Information Engineering Nanchang University China

ISBN: (纸本)9781424455157

To solve the problem of the original investment hedge when the field bus control system (FCS) substitute the distributed control system (DCS), we design a low-power intelligent pressure transmitter which is compatible with analog signals and digital signals. The pressure transmitter is designed based on HART protocol and composed with MCV module, sensor module, HART communication module, LCD modules and power supply module. The digital signal will be converted into the digital audio signal through the vii circuit in the design, superimposing on the current loop and realizing the compatible with digital signal and analog signal, at the same time, non-interfering. The total operating current of the entire circuit is no more than 2.1mA, guaranting the low-power requirement. By testing, the intelligent pressure transmitter can be connected with any manual control device or control system which are agreed with HART protocol, and the measurement accuracy has reached the requirement of 0.2%FS. ©2010 IEEE.

关键词： Low power electronics

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design and implementation of HDL modules and circuits for underwater optical wireless communication

Design and implementation of HDL modules and circuits for un...

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作者： Anguita, Davide Brizzolara, Davide Parodi, Giancarlo University of Genova Department of Biophysical and Electronic Engineering Via Opera Pia 11A Genova Italy

ISBN: (纸本)9789549260021

Underwater wireless optical communication has been used for establish a link between mobile vehicles and/or fixed nodes because light, especially in the blue/green region, allows to achieve higher data-rate than acoustical or electromagnetic waves for moderate distances. The here proposed work has the aim to pave the way for diffuse optical communication allowing to support optical communication in an Underwater Wireless Sensor Network of dense-deployed fixed nodes for specific application, such as monitoring and surveillance, for shallow, coastal and inland water in the case of moderate/limited area. The use of light impulse for communication is motivated by the possibility of targeting high data-rate, low-cost and small dimension components. This paper describes an overall vision of the system: a HDL implementation of flexible modules for the management of optical communication (based on IEEE 802.15.4 and IEEE 802.11 standard) which target the interface with current terrestrial technology for Wireless Sensor Networks;the design and implementation of circuits for underwater optical point-to-point and planar communication. The preliminary results and design consideration are reported considering also future possible developments.

关键词： optical communication

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Recent developments in Optimizing optical Tools for Air Bubble Detection in Medical Devices Used in Fluid Transport

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13th International conference on Biomedical engineering (ICBME)

作者： Ravichandran, S. Shanthini, R. Naadhirah, R. R. Nur Yikai, W. Deviga, J. Prema, M. Clinton, L. Temasek Polytech Temasek Engn Sch Singapore 529757 Singapore

ISBN: (纸本)9783540928409

Modelling techniques for optimizing bubble detection tools in the infrared band used in conjunction with a drug transport mechanism for the transport of intravenous fluids in clinical practice have been evaluated qualitatively using simulation techniques. Sensors which are used in signal processing often have limitation when they are made to work in noisy environment. Noise in the working environment can be from various sources such as from power line, high frequency RF fields and background luminance. In case of certain optical sensors, coupling schemes and the interference from devices which are in close proximity to the sensors can also contribute to significant noise. Qualitative studies on the effect of background luminance noise have provided a good understanding on the degree of susceptibility of the optoelectronic receiver for various luminance noises resulting in interferences in the output of a tool developed for the detection of air bubbles in fluid pathways called the "optical Bubble Detection Tool". Experience gained from the earlier studies has provided the required knowledge for developing a design which is less susceptible to external disturbances. The dynamic excitation method for the "optical Bubble Detection Tool" was introduced by modifying the electronic interface of the earlier "optical Bubble Detection Tool". This was easily achieved by understanding the requirements of the pulsed current for energizing the transmitter of the "optical Bubble Detection Tool". As the frequency of excitation and the intensity of the emitted infrared are factors which decide the resolution and sensitivity of the "optical Bubble Detection Tool", it was optimized for several operating environments which are under the influence of other external radiations in the visible range and non-visible range.

关键词： Bubble detection tool Background luminance noise optical sensors

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current status of closed-form Green's functions in layered media composed of natural and artificial materials

Current status of closed-form Green's functions in layered m...

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International conference on Electromagnetics in Advanced Applications (ICEAA)

作者： M. I. Aksun Aytac Alparslan K. A. Michalski Department of Electrical and Electronics Engineering Koc University Istanbul Turkey Department of Information Technology and Electrical Engineering Swiss Federal Institute of Technology Zurich Switzerland Department of Electrical and Computer Engineering Texas A and M University College Station TX USA

This paper provides an overview of the development of closed-form Green's functions in planar multilayered structures, with an emphasis given to the discrete complex image method (DCIM). In addition to the review of the materials in the literature, the latest developments on DCIM and its applications to artificial materials are also discussed.

关键词： Green's function methods Nonhomogeneous media Algorithm design and analysis Sampling methods Closed-form solution Surface fitting optical design Radio frequency High speed optical techniques Microwave circuits

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optical design of reflective wide-field cameras

Optical design of reflective wide-field cameras

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conference on current developments in Lens design and optical engineering IX

作者： Sasian, Jose Univ Arizona Coll Opt Sci Tucson AZ 85721 USA

ISBN: (纸本)9780819472809

This paper discusses some methodologies that apply to the optical design of reflective wide-field cameras. Among the methods considered are off-axis and eccentric pupil systems, concatenation of systems, tilted component systems, aberration theory, and confocal systems. The goal of the paper is to review design methods. In particular some systems are shown to illustrate two methodologies.

关键词： optical design mirror design wide-field reflective optics unobscured

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New tools for the lens designer

New tools for the lens designer

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conference on current developments in Lens design and optical engineering IX

作者： Dilworth, Donald C. Optical Systems Design Inc. (United States)

ISBN: (纸本)9780819472809

Several common impediments to successful lens design can be removed by application of new techniques. These involve using information that has long been calculated during the design process, but then discarded. Problems so addressed include the nuisance of discovering ray failures in the starting configuration, and that of tolerance desensitization, among others.

关键词： Lens optimization ray failures tolerance desensitization starting point stop position avoiding strain

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An optically passive athermal infrared optical system

An optically passive athermal infrared optical system

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conference on current developments in Lens design and optical engineering IX

作者： Li, Hua Shen, Mangzuo Chinese Acad Sci Inst Opt & Elect Chengdu 610041 Sichuan Prov Peoples R China

ISBN: (纸本)9780819472809

An optically passive athermal infrared optical system working in the 8 - 12 micron long wavelength infrared band was designed by using a special infrared optical material AMTIR (amorphous material transmitting infrared radiation). The design principle, design results are described in this paper. In addition, the optical system was incorporated with an infrared focal plane array forming an infrared camera. The thermal test of imaging quality of this camera is also presented

关键词： infrared optical system optical design athermal optical system

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