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Sight Distance in a Vertical Curve

Sight Distance in a Vertical Curve

Sight distance on vertical curves is critical in roadway design. It ensures drivers can see far enough ahead to identify and respond to hazards effectively. This directly impacts safety, driver comfort, and the overall efficiency of the transportation network.Vertical curves are classified into crest and sag curves based on their geometry. For crest curves, sight distance is determined by the line of sight between a driver's eye and a small object on the road's surface. Design parameters for...

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Updated: Jul 9, 2025

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT

Published on: August 4, 2018

基于OLED的曲线NLOS光学摄像头通信链接

Shivani Rajendra Teli, Vicente Matus, Carmen Lidia Aguiar

|December 1, 2023

概括

本研究介绍了用于非视线光学相机通信 (NLOS-OCC) 的曲有机发光二极管 (OLED). 研究表明,在室内环境中,信号噪声比 (SNR) 和接收成功率得到了改善.

科学领域:

光学通信是指光学通信.
无线通信技术无线通信技术
有机电子有机电子

背景情况:

非视线 (NLOS) 通信链路对于克服信号阻塞至关重要.
光学摄像头通信 (OCC) 提供了一个潜在的无线通信解决方案.
有机发光二极管 (OLED) 越来越多地用于显示和照明应用.

研究的目的:

首次通过实验证明在NLOS-OCC链路中使用曲的OLED作为发射器 (Tx).
通过分析信号噪声比 (SNR) 和接收成功率 (R) 来评估这个NLOS-OCC方案的性能.
调查关键参数 (如曝光时间,增强值,传输频率和距离) 对系统性能的影响.

主要方法:

一个新的NLOS-OCC系统被设计出来,使用一个曲的OLED作为发射器和一个摄像头作为接收器.
信号与噪声比 (SNR) 分析使用基于高斯混合模型的二元分类程序进行.
摄影和通信参数 (曝光时间,增益,频率,距离) 对SNR和接收率的影响被系统评估.

主要成果:

该研究成功地证明了在NLOS-OCC链接中使用曲线OLED的可行性.
使用高斯混合模型进行SNR分析,首次对基于OLED的NLOS-OCC进行了分析.

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Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT

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根据像素照明模型,证明增强值对SNR关于距离的影响是最小的.

对于一个2米长的NLOS-OCC连接与墙壁反射器,将传输频率提高到600Hz,曝光时间提高到1000-1500μs,并增加到25-45dB,导致1dB的SNR改进和4%的接收率 (83-87%).

结论:

曲线OLED是室内NLOS-OCC系统的可行和有效的发射器组件.
拟议的系统实现可靠的数据传输,即使在非视线条件下.
这些发现为通过调整关键操作参数来优化NLOS-OCC性能提供了宝贵的见解.