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相关概念视频

Leveling Equipment01:18

Leveling Equipment

As leveling involves measuring vertical distances relative to a horizontal line of sight, it requires a graduated rod, called a level rod, for vertical measurements and an instrument called a level for a horizontal sight line. A level includes a high-powered telescope with a mechanism for leveling to ensure the line of sight is horizontal when the bubble in the spirit level is centered. Leveling rods, made of wood, metal, or fiberglass, are graduated in feet or meters and commonly used in two-...
Influence of Earth's Curvature and Atmospheric Refraction on Leveling01:26

Influence of Earth's Curvature and Atmospheric Refraction on Leveling

During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
Field Application of Global Positioning System01:28

Field Application of Global Positioning System

The Global Positioning System (GPS) has become an indispensable tool in fieldwork, offering unparalleled precision and efficiency for surveying, navigation, and infrastructure development. By harnessing signals from a constellation of satellites, GPS receivers determine the location of objects with remarkable speed and accuracy, often completing calculations within a second.Advantages of Modern GPS TechnologyContemporary GPS receivers are designed to meet the practical demands of field...

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相关实验视频

Updated: Jun 29, 2026

Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution
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基于地表的大型视野光接收器用于增强的LiDAR系统.

Hanwen Guo1, Xiangkun Zhou1, Bo Gao1

  • 1Microsystems Technology Research Center, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China.

Nanophotonics (Berlin, Germany)
|August 7, 2025
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种用于紧型LiDAR系统的新型超表面光接收器. 这项创新显著提高了视野和信号接收,为先进的应用铺平了道路.

关键词:
李达尔 (LiDAR) 是一种激光雷达.metasurface 地表的表面是什么接近红外线的近红外线接收光学系统的接收.

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科学领域:

  • 光学和光子学 在光学和光子学.
  • 地表表面技术的技术.
  • 光学工程是指光学工程.

背景情况:

  • 紧型光探测和距离测量 (LiDAR) 系统在平衡视野 (FOV) 和信号接收方面面临着规模限制的挑战.
  • 现有的LiDAR接收器通常具有有限的FOV,限制它们在动态环境和无人机等平台上的适用性.
  • 超表面由于其子波长结构和操纵光的能力,为新型光学元件设计提供了潜力.

研究的目的:

  • 为基于超表面的光接收器提出一个通用设计原则,以增强大FOV能力.
  • 为了展示一个概念验证,用于紧,离轴LiDAR应用的Metasurface设备.
  • 改进LiDAR系统的有效信号接收和功率增强.

主要方法:

  • 一个基于超表面的光接收器是使用映射关系设计的,以获得最佳的性能.
  • 使用深紫外线 (DUV) 投影步骤光刻法制造了一种直径20毫米,4区域的超表面装置.
  • 该设备与直径为3毫米的雪崩光二极管 (APD) 相结合,用于性能评估.

主要成果:

  • 超表面光接收器实现了±30°的大视野.
  • 在940nm观察到一个显著的功率增强因子,从1.5到3倍,在940nm观察到.
  • 该设备在与雪崩光二极管集成时表现出有效的性能.

结论:

  • 开发的超表面光接收器为紧,高性能LiDAR系统提供了一个新的范式.
  • 这项技术为需要广泛的FOV和高效的光接收的应用程序提供了增强的功能.
  • 这些发现支持在无人机 (UAV) 和微型机器人等领域部署先进的LiDAR.