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conference on current developments in Lens design and optical engineering XvI

作者： Thorpe, Michael D. Dalzell, Kristen E. Raytheon ELCAN Opt Technol Midland ON Canada

ISBN: (纸本)9781628417449

Modern cine lenses require a high degree of aberration correction over a large and ever expanding image size. At low to medium volume production levels, these highly corrected designs also require a workable tolerance set and compensation scheme for successful manufacture. In this paper we discuss the design and manufacture of cine lenses with reference to current designs both internal and in the patent literature and some experience in design, tolerancing and manufacturing these lenses in medium volume production.

关键词： lens design compensators manufacturability cine

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High-sensitivity regulated inverter cascode transimpedance amplifier for near infrared spectroscopy

High-sensitivity regulated inverter cascode transimpedance a...

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Japan-Egypt International conference on Electronics, Communications and Computers (JEC-ECC)

作者： Ahmed Atef Mohamed Atef Mohamed Abbas Elsayed Esam M. Khaled Electrical Engineering Department Sohag University Sohag Egypt Electrical Engineering Department Assiut University Assiut Egypt School of Microelectronics Shanghai Jiao Tong University Shanghai China Electrical Engineering Department Kingdom of Saudi Arabia

This paper presents a design and a post layout simulation of a high-sensitivity low-power transimpedance amplifier (TIA) for frequency domain near infrared spectroscopy (FD-NIRS). The TIA consumes 340 μW from a 1.2 v DC supply. This low power is necessary for NIRS device portability. The proposed TIA achieves 104.8 dBΩ transimpedance gain, 50 MHz bandwidth and 15.1 nA rms total integrated input noise current for 2 pF off chip photodiode capacitance. The demonstrated TIA is simulated using 130 nm CMOS technology and occupies an area of 0.0012 mm 2 . Post amplifier stage is presented to increase the total gain. The complete NIRS optical receiver achieves 119.5 dBΩ gain, 49.2 MHz bandwidth, 15.4 nA rms total integrated input noise current and consumes 400 μW from a 1.2 v DC supply.

关键词： CMOS integrated circuits CMOS technology Spectroscopy Nonlinear optics optical amplifiers optical reflection optical sensors

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Analysis of three-element zoom systems for laser beam expanders with tunable-focus lenses 16

Analysis of three-element zoom systems for laser beam expand...

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conference on current developments in Lens design and optical engineering XvI

作者： Kulmon, Pavel Miks, Antonin Novak, Pavel Novak, Jiri Czech Tech Univ Fac Civil Engn Dept Phys Prague 16629 Czech Republic

ISBN: (纸本)9781628417449

Our work is focused on the problem of a theoretical analysis of imaging properties and an initial optical design of a three-element zoom optical system for laser beam expanders using lenses with a tunable focal length. Equations that enable to calculate basic paraxial properties and parameters of such optical systems are derived Finally, the derived equations are applied on an example of calculation of parameters of the three-element zoom system for the laser beam expander.

关键词： geometric optical design first-order optics zoom lenses laser beam expander Gaussian beam tunable-focus lenses

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Integrative risk assessment and management for recycled water schemes: An Australian study 6

Integrative risk assessment and management for recycled wate...

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6th International Disaster and Risk conference: Integrative Risk Management - Towards Resilient Cities, IDRC Davos 2016

作者： West, Camilla Hassall, Maureen Kenway, Steven Yuan, Zhiguo Advanced Water Management Centre and CRC for Water Sensitive Cities University of Queensland Brisbane Australia School of Chemical Engineering University of Queensland Brisbane Australia School of Chemical Engineering and CRC for Water Sensitive Cities University of Queensland Brisbane Australia

A drive to diversify water supply sources and promote sustainable and resilient urban development has led to the implementation of recycled water schemes in residential developments of Australia. While a portion of these schemes have been successfully implemented, a significant number have been delayed in commissioning or decommissioned well before the end of their design life. Research suggests that risk assessments have primarily focussed on the environmental and public health risks associated with recycled water, with few stakeholders conducting an integrative and comprehensive assessment of risk factors that could adversely impact the viability and sustainability of these schemes. Through in-depth interviews with water industry practitioners, six limiting factors of current risk assessment and management practices were identified comprising poorly defined project objectives;a focus on hard, quantifiable risks with less consideration to soft, qualitative risks;independent assessment of risk factors;a siloed approach to risk assessment and management;minimal consideration to the time frame and context of recycled water schemes and the need to diversify management measures from that traditionally adopted. A framework to address the limitations in risk assessment and management practices for recycled water schemes, and potentially for a broad array of sustainable and resilient urban initiatives, is presented in this paper. © 2016 CURRAN-conference. All rights reserved.

关键词： Risk assessment

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1.44 mW and 60 dB dynamic range optical receiver for near infrared spectroscopy

1.44 mW and 60 dB dynamic range optical receiver for near in...

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International conference on Microelectronics, ICM

作者： Ahmed Atef Mohamed Atef Mohamed Abbas Elsayed Esam M. Khaled School of Microelectronics Shanghai Jiao Tong University Shanghai China Electrical Engineering Department Sohag University Sohag Egypt Electrical Engineering Department Assiut University Assiut Egypt Electrical Engineering Department King Saud University kingdom of Saudi Arabia Assiut University Assiut EG

This paper presents the design and post layout simulation of a high dynamic-rang and low-power transimpedance amplifiers (TIA) for frequency domain near infrared spectroscopy (FD-NIRS). The proposed TIA achieves 108.3 dBΩ gain, 10 MHz bandwidth, and 5.5 nArms integrated input referred noise using a photodiode with 2 pF capacitance. The proposed TIA consumes 260 μW from a 1.2 v supply. The maximum input photocurrent is extended to 9.2 μAp-p with the adopted automatic gain control (AGC). A post amplifier with AGC is introduced after the TIA to increase the gain of the optical receiver and to maintain a good linearity. The complete optical receiver achieves 122 dBΩ gain, 9.9 MHz bandwidth, 5.9 nArms total integrated input noise current, and consumes 1.44 mW from a 1.2 v supply.

关键词： optical receivers Gain control Gain Dynamic range Power demand Mathematical model Radio frequency

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Novel hybrid III:v concentrator photovoltaic-thermoelectric receiver designs

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AIP conference Proceedings 2017年第1期1881卷

作者： Tracy K. N. Sweet Matthew H. Rolley Martin J. Prest Gao Min Cardiff School of Engineering Cardiff University Queen’s Buildings The Parade Cardiff. CF24 3AA. UK

This paper presents the design, manufacture and electrical characterization of novel hybrid III:v Concentrator Photovoltaic-Thermoelectric receivers. Addition of an encapsulating and spectral homogenizing single active surface secondary optic lens increased the solar cell electrical power output from 7.66mW (ALPHA no cooling) to 18.20mW (KAPPA with TE cooling). The effective optical concentration of the optics, based on short circuit current, was x2.4. A linear irradiance vs maximum power receiver output relationship was observed (R2=0.9978), confirming good optical alignment during manufacture and likewise internal current matching of the series-connected triple-junction cell. An in-depth COMSOL model for simulated evaluation of the synergistic thermally-dependent parameters inherent to hybrid devices was built and experimentally validated.

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Measuring reflective properties of surfaces using OPTE-F3K

Measuring reflective properties of surfaces using OPTE-F3K

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IEEE Lighting conference of the visegrad Countries (Lumen v4)

作者： Rudolf Bayer Tomáš veselka Department of Electrical Power Engineering Czech Technical University in Prague Prague Czech Republic

ISBN: (纸本)9781509033065

Modern computer lighting design programs are using purely diffuse reflecting surfaces during calculations for simplification reasons. For more accurate calculations it is necessary to use real reflective properties of surfaces that can be measured by a reflectophotometer. The reflectophotometer OPTE-F3K of the Department of Electrical Power engineering, FEE CTU in Prague, allows measuring reflective properties of surface samples 2 by 2 cm. ReflectoSoft, an application designed especially for this reflectophotometer, enables measurements of BRDF in the Klems system of patches. The measured values can then be stored into an XML file containing the BRDF matrix of 145 × 145 elements. The results can be viewed using the software BSDFviewer. The goal of this paper is to present the current state of the renovation of OPTE-F3K, which enables ray tracing algorithms to use measured reflective properties of real materials.

关键词： Light sources Computers optical variables measurement XML Ports (Computers) optical reflection

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Integration design of rigid endoscope with different viewing angles 16

Integration design of rigid endoscope with different viewing...

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conference on current developments in Lens design and optical engineering XvI

作者： Zhang, Lingyun Cheng, Dewen Wang, Yongtian Beijing Inst Technol Sch Informat Sci & Technol Dept Optoelect Engn Beijing 100081 Peoples R China

ISBN: (纸本)9781628417449

High definition and magnification rigid endoscope is a significant equipment in the examination and surgery. In this paper, the design of a high definition (HD) rigid endoscope with zero viewing direction is presented with a FOv of 70. The entrance pupil is 0.3 mm, achieved for the first time to our best knowledge. For the fabricated prototype, the theoretical resolution is 22.3 lp/mm at an object distance of 20 mm, and the depth of field (DOF) is 115 mm The performance is proved to be great for observation during diagnosis and surgery. Besides, the endoscope with non-zero viewing direction is more needful in some conditions such as observing and diagnosing lesions on inner walls of organs and tissues. In this paper, we present two designs with non-zero viewing direction for better applications.

关键词： optical design rigid endoscope high definition depth of field stray light

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DISTRIBUTED MIMO SYSTEMS: RECEIvER design AND ML DETECTION

DISTRIBUTED MIMO SYSTEMS: RECEIVER DESIGN AND ML DETECTION

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IEEE International conference on Acoustics, Speech and Signal Processing

作者： Yi Cao Weifeng Su Stella N. Batalama Department of Electrical Engineering University at Buffalo SUNY NY 14260

ISBN: (纸本)9781479999897

We propose a novel receiver design for distributed MIMO systems that accounts for multiple carrier frequency offsets (CFOs) and multiple timing offsets (TOs). The proposed structure utilizes a bank of pulse matched filters (one per effective CFO) at each receive antenna, followed by an information symbol detector. Each filter in the bank is sampled at the symbol rate with sampling timing selected according to the corresponding TO. For the proposed receiver configuration, we derive the maximum likelihood (ML) detector. Our theoretical developments are illustrated through extensive simulation studies and indicate that the proposed receiver structure together with the optimal ML detection offers significant performance gains compared to the current state of the art.

关键词： Distributed MIMO systems receiver designs carrier frequency offsets timing offsets

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Ultra-compact hourglass lens for integrated cameras 16

Ultra-compact hourglass lens for integrated cameras

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conference on current developments in Lens design and optical engineering XvI

作者： Rezaei, Mohsen Nia, Iman Hasani Bonakdar, Alireza Mohseni, Hooman Northwestern Univ Dept Elect Engn & Comp Sci Bioinspired Sensors & Optoelect Lab BISOL Evanston IL 60208 USA

ISBN: (纸本)9781628417449

An ultra-small telecentric lens with sub-millimeter thickness is proposed. This lens with 0.2 numerical aperture and high field of view is a good candidate to be used in multi-aperture super resolution imagers. Point spread function and the telecentricity of the lens is extracted numerically and measured experimentally. The ray-optics simulation results show nearly diffraction limited performance for the lens.

关键词： Cameras Imaging systems Point spread functions Silicon Image sensors Lens design Infrared cameras Modulation transfer functions Super resolution Sensors

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