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

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Infrared Detector developments at Teledyne e2v for current and Future Missions

Infrared Detector Developments at Teledyne e2v for Current a...

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2022 International conference on Space Optics, ICSO 2022

作者： Swindells, Ian Wheeler, Ross Jerram, Paul Kendall, Jeremey Read, Iain Teledyne e2v 106 Waterhouse Lane ChelmsfordCM1 2QU United Kingdom

ISBN: (纸本)9781510668034

There is increased interest in hyperspectral imaging space missions as a powerful remote sensing technique for Earth observation. The Teledyne HgCdTe FPA and digital ROIC technology enable Teledyne e2v to provide wide bandwidth, high frame-rate detector solutions that are enabling a simplification in hyperspectral instrument design for both institutional large scale missions and for future commercial constellations. In parallel Teledyne e2v are developing III-v technology for surveillance applications that could find use in future generations of space based instruments. © 2023 SPIE. All rights reserved.

关键词： Cadmium alloys

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design of a Transimpedance Amplifier for Self-Mixing optical Feedback System

Design of a Transimpedance Amplifier for Self-Mixing Optical...

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International conference on Systems, Control and Automation, ICSCA 2023

作者： Bhardwaj, vibhor Kumar Maini, Surita Teerthanker Mahaveer University Uttar Pradesh Moradabad India Sant Longowal Institute of Engineering and Technology Punjab Sangrur India

ISBN: (纸本)9789819773831

The interferometric signal acquired in the photodetection method, under weak feedback conditions, often has a less magnitude, typically in the microampere range (≈10–6). Due to low magnitude, the characteristical points of the interferometric signal are highly susceptible to noise originating from optical and electronic arrangements. This meager range of current signals has been translated into an appropriate voltage level for faithful signal processing. In this paper, the authors proposed a dedicated transimpedance amplifier (TIA) to convert the photodiode current from 0.05 to 0.4 mA to a voltage level between 0.1 v and 3.2 v. The TIA has been designed using OPA320 and exhibits a gain of 8 kv/A with a −3 dB bandwidth of 250 kHz. The proposed TIA is simulated in TINA-TI and validated by fabricating a four-layer PCB prototype. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： optical feedback

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design of an expander lens for an MWIR zoom camera using the third-order aberration analysis 23

Design of an expander lens for an MWIR zoom camera using the...

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conference on current developments in Lens design and optical engineering XXIII Part of SPIE Optics and Photonics conference

作者： Yun, Min-Seok Ryu, Tae-Sik Park, Sung-Chan Dankook Univ Dept Phys 119 Dandae Ro Cheonan Si 31116 Chungcheongnam South Korea

ISBN: (纸本)9781510654198;9781510654181

This study presents the methods for designing an expander lens for an MWIR zoom lens through the third-order aberration analysis and evaluating the optical zoom system. This expander lens is used to enlarge the focal lengths of an original main zoom lens two times, which unfortunately doubles the aperture size of the expander lens elements. Thus, this extended apertures significantly generate the aberrations of a zoom system. To solve the problem, an expander lens has been designed using the third-order aberration analysis numerically. Since an MWIR optical system uses a cooled detector, this zoom system should be designed to eliminate the narcissus effect. Using this design approach, we efficiently obtain an expander lens for an MWIR zoom system satisfying the current requirements.

关键词： Zoom lenses Monochromatic aberrations optical spheres Mid-IR Chemical elements Lens design Transparent conductors Modulation transfer functions Spherical lenses Infrared radiation

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Accurate camera performance prediction using optical and imaging simulation pipeline for super wide-angle lens 23

Accurate camera performance prediction using optical and ima...

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conference on current developments in Lens design and optical engineering XXIII Part of SPIE Optics and Photonics conference

作者： Buquet, J. Larouche, R. Parent, J. Roulet, P. Thibault, S. Immervision 2020 Blvd Robert Bourassa Montreal PQ H3A 2A5 Canada

ISBN: (纸本)9781510654198;9781510654181

optical design process consists in minimizing aberrations using optimization methods. It relies on key performance indicators (KPIs), such as point spread function (PSF), Modulated transfer function (MTF), or relative illumination (RI) and spot sizes, that depend on lens elements aberrations. Their target values need to be defined -either for human or machine perception- at early stage of the design, which can be complex to do for challenging designs such as extended field of view. We developed an optical and imaging simulation pipeline able to render the effects of complex optical designs and image sensor on an initial aberration-free image. Extracting files from ray tracing software for simulating the PSF and sensor target information, the algorithm accurately renders off-axis aberrations with Zernike polynomials representation combined with noise contribution and relative illumination. The obtained image faithfully represents an optical system performance from the optics to the sensor component and we can then study the impact of additional aberration introduction.

关键词： End-to-End design spatially varying PSF wide angle image simulation

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A Toolkit for Multiscale optical System Inverse-design 23

A Toolkit for Multiscale Optical System Inverse-Design

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conference on current developments in Lens design and optical engineering XXIII Part of SPIE Optics and Photonics conference

作者： Campbell, Sawyer D. Jenkins, Ronald P. Zerbe, Benjamin A. Whiting, Eric B. Balasubramanian, Manushanker Das, Arkaprovo Young, Jacob T. Werner, Douglas H. Werner, Pingjuan L. Penn State Univ Sch Elect Engn & Comp Sci University Pk PA 16802 USA

ISBN: (纸本)9781510654198;9781510654181

optical system design is undergoing a transformational change with the increases in computational horsepower, cutting-edge algorithmic developments, and the advent of new nanofabrication technologies. Among the most exciting advances in recent memory are optical metasurfaces, which are patterned surfaces commonly realized through nanofabrication that can imbue optical engineers with expanded degrees of design freedom due to their ability to exploit the generalized form of Snell's law. Through intelligent optimization and design, metasurfaces can be constructed which achieve arbitrary chromatic dispersion behaviors and unprecedented control over polarization that simply cannot be realized with conventional optical elements. However, designing high-performance metasurfaces requires the use of full-wave simulation tools and numerical optimization techniques which necessitate considerable computational resources. Moreover, while optical metasurfaces are moving towards millimeter and centimeter scale diameter lenses with advances in nanofabrication techniques, it is computationally infeasible to employ full-wave simulation tools directly to model optical systems that use such large size elements. Nevertheless, the size, weight, and power (SWaP) advantages afforded by optical metasurfaces make them a compelling choice for designers to consider in a number of applications, which are currently limited by bulky conventional optical solutions. Therefore, techniques that can rapidly model metasurfaces in conjunction with conventional optical elements such as lenses, mirrors, and prisms are highly desirable. In this presentation, we highlight a toolkit of custom solvers, design procedures, and powerful optimization algorithms that simplify and accelerate the development of hybrid optical systems with arbitrary combinations of conventional and metasurface elements.

关键词： optical design optimization inverse-design gradient-index lenses metasurfaces simulation multiscale

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Low-power off-chip capacitor-free LDO design with high transient response 2

Low-power off-chip capacitor-free LDO design with high trans...

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2nd International conference on Electrical, Electronics, and Information engineering, EEIE 2023

作者： Wu, Haoran Yin, Jiayu Huang, Xindong Chen, Chengying Xiamen University of Technology No. 600 Polytechnic Road Houxi Town Jimei District Xiamen China

ISBN: (纸本)9781510672840

To reduce the area occupied by the low dropout regulator (LDO) in the whole chip system and to current consumption in standby state, this paper proposes a new structure using a diode-connected PMOS as a load resistor, which optimizes the area of the chip under the premise of guaranteeing the performance. The circuit is realized with UMC 28nm 1p9m process. The simulation results show that it can stably output a voltage of 1.197v under an input voltage of 2.5-3.6v, and its current operation range is 100μA-20mA with a transient response time of ≤0.5μs, a quiescent current of 9μA, and a phase margin of ≥77°. © 2024 SPIE.

关键词： Transient analysis

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design of a low-temperature drift voltage reference based on parasitic capacitance startup 7

Design of a low-temperature drift voltage reference based on...

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7th International conference on Advanced Electronic Materials, Computers, and Software engineering, AEMCSE 2024

作者： Zhou, Lu College of Wealth Management Ningbo University of Finance & Economics Zhejiang China

ISBN: (纸本)9781510681866

To enhance the performance of the PMU, a voltage reference based on a voltage bandgap has been proposed. During the power-on process, the startup circuit is activated due to parasitic capacitance coupling. After the power-on process is completed, the startup circuit self-turns off to reduce power consumption. Subsequently, a high-order compensation circuit is designed to generate a current with only constant and high-order temperature terms, compensating for the temperature coefficient of the voltage bandgap. An RC filter is then added to the output to improve the power supply rejection ratio in the high-frequency range. To further reduce the power consumption of the voltage bandgap, almost all MOS transistors are operated in the subthreshold region, achieving a decrease in static current consumption. Circuit design and simulation were completed based on the TSMC 0.18 μm CMOS process. The results indicated that at a supply voltage of 1.8 v, the bandgap output was 1.232 v;within the temperature range of -40 ℃ to 140 ℃, the temperature coefficient was 4.8×10-6 ℃-1;with the addition of the RC filter, the power supply rejection ratio at high frequency was -73 dB @ 10 MHz;furthermore, the static current of the entire bandgap was only 3.7 μA. © 2024 SPIE.

关键词： CMOS integrated circuits

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design and Evaluation of HvDC Power Supply for Remotely Operated vehicle 59

Design and Evaluation of HVDC Power Supply for Remotely Oper...

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59th International Universities Power engineering conference, UPEC 2024

作者： Alimi, Sulaimon O Al-Greer, Maher Pinedo-Cuenca, Ruben Warnakulasuriya, Kapila Dhanapala, vijira Gurwicz, David School of Computing Engineering and Digital Technologies Teesside University Middlesbrough United Kingdom Buckingham Magnetics Ltd Victoria Building Middlesbrough United Kingdom

ISBN: (纸本)9798350379730

The growing demand for high-voltage direct current (HvDC) power supplies in the field of remotely operated vehicles (ROvs) has experienced a significant rise due to developments in underwater exploration and intervention technologies. This study provides an in-depth analysis of the design and assessment of a HvDC power supply system for ROvs. The main goal is to attain a substantial direct current (DC) voltage output of 5000 v, which is crucial for supplying power to ROv activities in deep-sea environments. To achieve this objective, a sophisticated configuration of a 24-pulse rectifier is presented and thoroughly examined. The design process entails a detailed evaluation of component selection and circuit topology to guarantee optimal efficiency and reliability. The 24-pulse rectifier is specifically focused on the benefits it provides, especially in terms of minimising harmonics and enhancing power quality. These factors are crucial for underwater applications, where ensuring a reliable and efficient power supply is of utmost importance. The suggested HvDC power supply is subjected to comprehensive evaluation through simulation studies. The success of the design technique is validated by thoroughly assessing performance parameters like voltage regulation, efficiency, harmonic distortion, and ripple factor. The proposed system demonstrated approximately 99.99% efficiency, with a total harmonic distortion (THD) of 0.045 and voltage and current ripple values of 0.0646% and 10.3911%, respectively. © 2024 IEEE.

关键词： Harmonic distortion

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Fault Detection of Distributed Power Distribution Network Based on Grey Wolf pack Algorithm

Fault Detection of Distributed Power Distribution Network Ba...

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2024 International conference Optoelectronic Information and optical engineering, OIOE 2024

作者： Li, Yuqing Luo, Jinman Wang, Haiji Dongguan Power Supply Bureau Guangdong Power Grid Corporation Guangdong Dongguan China China Energy Construction Group Guangdong Electric Power Design and Research Institute Co. Ltd. Guangdong Guangzhou China

ISBN: (数字)9781510688209

ISBN: (纸本)9781510688193

The integration of distributed power supply into the distribution network is an important trend in the development of the current new power system. In view of the problem that the system can not quickly and accurately obtain the fault type and locate the location of the fault when the current distributed power distribution network fails. Introduce a detection method to optimize the current fault analysis system of distribution network based on the grey Wolf pack algorithm (Grey Wolf Optimization, GWO), and optimize the fault detection algorithm based on the optimization of distribution network structure. In addition, a complete analytical model of complete fault information such as medium calculation, misoperation and action is constructed to improve the analytical model of detecting complex fault situations in the distribution network. Through example analysis, the effectiveness of the fault detection model of distributed power distribution network based on gray Wolf swarm algorithm is verified, reducing the probability of fault miscalculation of distribution network to a certain extent, and solving the problem of low accuracy and slow speed of distribution network fault detection in the traditional algorithm. © 2025 SPIE.

关键词： Power distribution faults

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A low quiescent current high PSRR LDO circuit 3

A low quiescent current high PSRR LDO circuit

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3rd International conference on Computer Technology, Information engineering, and Electron Materials, CTIEEM 2023

作者： Zhou, Haining Zhu, Bin Lin, Haijun Lei, Yajie School of Opto-Electronic and Communication Engineering Xiamen University of Technology Fujian Xiamen China

ISBN: (纸本)9781510672925

In order to meet the needs of Internet of Things devices and wearable electronic devices for lower standby power consumption and power supply noise, a Low Dropout Regulator (LDO) circuit with low quiescent current and high power supply rejection ratio is designed. The core circuit is bandgap and error amplifier. This design is based on the 0.18um BCD process. The Spectre simulation of Cadence has been used to test and simulate the circuit. The simulation result indicates that the bandgap voltage is 1.209v, the temperature coefficient is 19.76ppm/°C in the range of -25∼125°C, and the power supply rejection ratio is 69dB at low frequency. The circuit can deliver a quiescent current of around 776nA and exhibits good temperature characteristics and low quiescent current. © 2024 SPIE.

关键词： Energy gap

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