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共 473 条记录，以下是81-90 订阅

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A target modeling method for LADAR target simulator

A target modeling method for LADAR target simulator

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Applied optics and photonics China (AOPC) conference - optical Sensing and Imaging Technology

作者： Xu, Rui Lin, Bing Kun Zhang, Rui Wen Liu, Bing China Acad Elect & Informat Technol Beijing 100144 Peoples R China Beijing Inst Technol Sch Optoelect Beijing 100081 Peoples R China

ISBN: (纸本)9781510639560

Direct detection laser detection and ranging (LADAR) has been widely used in many specific applications such as precision guidance, machine vision, underwater images, landslides investigations, city modeling, and so forth. One of the most promising methods to design, develop, test and validate a LADAR system is hardware-in-the-loop (HWIL) simulation. LADAR target simulator generates return signals of the simulated targets and background according to the test requirements. One of the key technologies of the LADAR target simulator is target modeling. A target modeling method based on data matching and restoring is pdroposed in this paper, which can provide a feasible way for LADAR target simulator to acquire the information of the target. The coordinate transformation is used to transform the target coordinate data under two or more viewpoint coordinate system into the reference point coordinate system to obtain the whole information of the target. Then, the target coordinate data under the reference coordinate system is transformed into a given viewpoint coordinate system. Furthermore, the deley time and the pulse width are calculated arrcording to a return signal mathematical model. Finally, the effects of the incident angle and target distance on target data are analyzed.

关键词： target modeling data generation target simulator Hardware-in-the-loop simulation LADAR

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Effect of free carrier on high repetition rate pulse trains in silicon nanowire waveguides

Effect of free carrier on high repetition rate pulse trains ...

引用

Applied optics and photonics China (AOPC) conference - Optoelectronics and Nanophotonics and Quantum Information Technology

作者： Huang, Guocheng Fu, Meicheng Qi, Junli Pan, Jinghan Yi, Wenjun Wang, Xiaochun Li, Xiujian Natl Univ Def Technol Coll Liberal Arts & Sci Changsha Peoples R China

ISBN: (数字)9781510639508

ISBN: (纸本)9781510639508

By using the finite difference method, the nonlinear effects of high repetition rate femtosecond pulse trains in silicon nanowire waveguides were analyzed. By numerically modeling the propagation of femtosecond pulse in silicon nanowire waveguides with the generalized nonlinear Schrodinger equation, the temporal and spectral properties of femtosecond pulses propagating are discussed, and the physical mechanisms of pulse evolution are demonstrated. The simulation results indicate that, owing to the remarkable nonlinear effect, the carriers in the silicon waveguide are rapidly excited with the increase of the input laser power, subsequently have significant modulation effects on the high repetition rate pulses train. For various repetition rate and power of the laser pulses train, the output pulses train will get different temporal compression and broadening under the dominance of different nonlinear effects. Furthermore, the results demonstrate that the spectrum evolution of pulse train with different transmission distances is similar to the calculated results of single pulse transmission. The results will provide an important reference for the design of optical sampling clock, microwave photonic radar system and the sweep of carriers in waveguide.

关键词： silicon photonics nonlinear optics microwave photonics free carrier two-photon absorption

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Real-time Analysis and Simulation of Remote Sensing Photoelectric Information from Aerospace Fourier Transform Infrared Spectrometer

Real-time Analysis and Simulation of Remote Sensing Photoele...

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Applied optics and photonics China (AOPC) conference - optical Spectroscopy and Imaging and Biomedical optics

作者： Bu Hongbo Wei Haoyun Wu Songbo Wang Gengyun Xie Lili Li Lijin Chen Long Shi Feng Beijing Inst Space Mech & Elect 104 You Yi Rd Beijing 100094 Peoples R China Tsinghua Univ 30 Shuang Qing Rd Beijing 100084 Peoples R China

ISBN: (纸本)9781510639546

Based on the working mechanism and characteristics of spaceborne hyperspectral Fourier transform infrared spectrometer, the computer and software were used as data acquisition and processing tools in this paper to study and simulate the various processes in photoelectric information processing of spectrometer. Analytical models including functional modules such as interference signal generation, effective signal detection, spectral data inversion and instrument error correction was established, then a visualization software system was developed. Finally, the accuracy of the model was calculated and optimized with experiments, the verification results show that this resolving system can process the interference data with high spectral resolution non- destructively, significantly improve the smoothness of the restored spectrum without distortion, and the measured spectral resolution of an instrument is better than 0.03cm(-1). This digital model could provide useful support for the design and parameter optimization of the aerospace Fourier transform infrared spectrometer.

关键词： Fourier transform infrared spectrometer Computor modeling and simulation Remote sensing data Interference signal FFT FTIS ILS

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Determining Optimal Orientation of Straight-Vane Baffles for Stray Light Mitigation

Determining Optimal Orientation of Straight-Vane Baffles for...

引用

conference on optical modeling and system alignment at spie optics + photonics conference

作者： Herman, Eric Zygo Corp 2031 Main St Irvine CA 92614 USA

ISBN: (数字)9781510629004

ISBN: (纸本)9781510629004

Stray light mitigation is a critical aspect in many optical systems and can be approached in many ways. One method to reduce stray light is to incorporate baffle vanes into a system. To go from an ideal baffle vane to a manufacturable baffle adds complexity in how to mechanically reduce stray light. This paper discusses the manufacturable aspect of baffle vane fabrication in determining the optimal orientation a bevel should have on a straight-vane baffle. Various configurations for bevel orientation were analyzed to provide a deeper understanding of past research.

关键词： stray light baffle vane design optical system design

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Adjoint-based particle defect yield modeling for silicon photonics

Adjoint-based particle defect yield modeling for silicon pho...

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conference on optical modeling and system alignment at spie optics + photonics conference

作者： Zhang, Zhengxing McIlrath, Michael B. Boning, Duane S. MIT 77 Massachusetts Ave Cambridge MA 02139 USA

ISBN: (数字)9781510629004

ISBN: (纸本)9781510629004

Integrated silicon photonics offers great potential for monolithic integrated photonic and electronic components using existing integrated circuit fabrication infrastructure. However, understanding of the impact of IC process variations on performance of photonic components remains limited. Methods for analysis that identify sensitivity of photonic components to the variety of process variations encountered during fabrication are crucial to enable viable design and manufacturing of silicon photonic systems. We present the application of the adjoint method to predict the impact of different types of particle defects on silicon photonic circuits. The adjoint method is applied for both component and circuit level analysis to reduce computational cost, and shows good consistency with direct simulations. The results for complicated device components and small circuits are shown and discussed. The model and results can be used to help generate layout design rules and critical area extraction methods, and to assist silicon photonics designers in predicting and optimizing yield of complex silicon photonics devices and circuits.

关键词： Silicon photonics adjoint method particle defect yield modeling

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Prism alignment using a Point Source Microscope

Prism alignment using a Point Source Microscope

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conference on optical modeling and system alignment at spie optics + photonics conference

作者： Parks, Robert E. Opt Perspect Grp LLC Tucson AZ 85750 USA

ISBN: (数字)9781510629004

ISBN: (纸本)9781510629004

The Point Source Microscope (PSM) is used to locate the apex of retroreflecting prisms in 3 degrees of translational freedom with a precision of less than 1 micron. The process is easily explained for right angle prisms, as will be done in this paper, but the explanation is valid for cube corner retroreflectors such as those mounted in spherical balls, spherically mounted retroreflectors, or SMRs, for use with laser trackers. With suitable, simple fixturing, the measurements for all 3 directions are made to a precision of < 1 mu m in less than 1 minute.

关键词： Reflectors Microscopes Reflection Eye Prisms Retroreflectors Light Objectives Sensors Spherical lenses

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Feature of spaceborne laser communication telescope isolation

Feature of spaceborne laser communication telescope isolatio...

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9th conference on Applied optics and photonics China (AOPC) - Advanced Laser Technology and Application (AOPC)

作者： Shi Dong-liang Fu Rui-min Liu Jian-feng Hu Bin Beijing Inst Space Mech & Elect Beijing 100094 Peoples R China

ISBN: (纸本)9781510639461

Spaceborne laser communication system utilize laser to transfer information, which can realize star to star, star to earth communication. It has the advantage of wide bandwidth, high anti-jamming capability, good secrecy performance, small size and weight, and lower power dissipation. Laser communication telescope, which is use for laser beam alignment, is the main part of spaceborne laser communication system to realize long distance transmission. As transmit-receive integration is the mainstream form of spaceborne laser communication system in current, isolation become a kernel index which determined the signal-to-noise ratio and transmission distance. optical telescope of coaxial two-mirror reflective structure and off-axis three mirror reflective structure were built, and stay light analysis was done on both kind of laser communication telescope to get the isolation. The results show that the isolation of coaxial two-mirror reflective optical telescope is 62dB and the isolation of off-axis three mirror optical telescope is 70dB. Furthermore, the results show that mirror scatter is the dominant influence factor of isolation. Through comparative analysis of two forms of optical system, under the same condition, off-axis three mirror optical telescope has a better performance in isolation.

关键词： Laser communication isolation Coaxial double reflection optical telescope off-axis three mirror optical telescope

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Specification of aspherical surfaces used as refractive elements in micro-optical systems

Specification of aspherical surfaces used as refractive elem...

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conference on optical modeling and system alignment at spie optics + photonics conference

作者： Beguelin, Jeremy Scharf, Toralf Noell, Wilfried Voelkel, Reinhard SUSS MicroOpt SA Rouges Terres 68 CH-2068 Hauterive Switzerland Ecole Polytech Fed Lausanne Nanophoton & Metrol Lab CH-1015 Lausanne Switzerland

ISBN: (数字)9781510629004

ISBN: (纸本)9781510629004

The optical performance of refractive plano-convex microlenses is mainly related to the quality of their (a)spherical surface. An efficient tolerancing of this surface is a key step towards the manufacturing of high quality microlenses. However, we demonstrate that the intuitive approach based on geometric parameters such as radius of curvature, conic constant and irregularity is ineffective. We thus propose to use common optical figures of merit, RMS spot size and wavefront aberration, to specify the surface. Not much complexity is added since both quantities can be expressed as analytical functions of the surface in the case of plano-convex microlenses. Such surface specification via direct evaluation of the optical performance offers a better control of the microlens quality.

关键词： Refractive Micro-optics Aspherical Microlens Aspherical Surface Tolerancing RMS Spot Size Wavefront Aberration Wafer Level optics

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4th International conference on photonics Solutions, ICPS 2019

4th International Conference on Photonics Solutions, ICPS 20...

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4th International conference on photonics Solutions, ICPS 2019

ISBN: (纸本)9781510634299

The proceedings contain 32 papers. The topics discussed include: quantum key distribution solution over indoor visible light communication networks;pH and temperature underwater monitoring with application using visible light communications;three-dimensional VLC indoor positioning system using smart device camera receiver with image processing technique;the study of geometries effect of hexagonal metamaterial absorber in the terahertz regime;3D printed assembly and software development for silicon photonics sensor device measurement;synchrotron radiation study of nitrogen in chemical fertilizer used as explosive: feasibility study;self-interference along boundaries between positive and negative refractive index media for 3D displays;and a novel method for camera calibration and image alignment of a thermal/visible image fusion system.

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Predictive tolerance bands for the correction-less assembly of optical systems

Predictive tolerance bands for the correction-less assembly ...

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conference on optical modeling and system alignment at spie optics + photonics conference

作者： Schindlbeck, Christopher Pape, Christian Reithmeier, Eduard Leibniz Univ Hannover Inst Measurement & Automat Control Nienburgerstr 17 Hannover Germany

ISBN: (数字)9781510629004

ISBN: (纸本)9781510629004

When assembling optical systems, uncertainties of the positioning system and overall mounting tolerances lead to the deterioration of performance due to resulting misaligned optical components. In this paper, we present a novel methodology for the correction-less assembly of optical systems based on predictive tolerance bands. By running a simulation model in parallel to the assembly process, performance predictions can be made during the assembly that take into account the uncertainties of the positioning system. Typically, optical performance can be assessed by a variety of criteria. In this paper, we utilize the Marechal criterion based on the root mean square (RMS) error as it allows to verify if the optical system is defraction-limited. The extension with Monte Carlo methods enables the prediction of mean values and standard deviations for the chosen metric. This is done for the entire optical system yet to be assembled by integrating uncertainties of the positioning system within the simulation framework. Before assembly, a desired threshold (here the RMS value derived from the Marechal criterion) can be specified which is predicted and monitored throughout the assembly process. For verification, we analyze a two-lens system in simulation to demonstrate our proposed framework.

关键词： Automated alignment assembly tolerancing wavefronts wavefront sensors adaptive optics beam expander

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