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Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over...
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相关实验视频

Updated: Dec 24, 2025

Author Spotlight: A Stable Phantom Material for Optical and Acoustic Imaging
04:54

Author Spotlight: A Stable Phantom Material for Optical and Acoustic Imaging

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量子弱测量增强了分布式声学传感.

Qingxin Deng, Hongjing Li, Qi Song

    Optics letters
    |November 27, 2024
    PubMed
    概括

    本研究引入了使用量子弱测量的增强分布式声学传感 (DAS) 系统. 新方法显著降低了系统噪声,并提高了用于声学检测的空间分辨率.

    科学领域:

    • 量子光学是一种量子光学.
    • 干涉测量是干涉测量的方法.
    • 光纤传感传感器是指光纤传感器.

    背景情况:

    • 分布式声学传感 (DAS) 对于监控声信号至关重要.
    • 经典的DAS系统在噪音和空间分辨率方面面临限制.
    • 量子现象有可能提高测量灵敏度.

    研究的目的:

    • 提出一个增强的分布式声学传感 (DAS) 系统.
    • 为了利用量子弱测量来改进声信号检测.
    • 分析拟议的DAS方案的理论性能.

    主要方法:

    • 采用了扩展的马赫-泽恩德干扰仪配置.
    • 声信号被编码为极化光中的相对相位移.
    • 用预选择和后选择的量子弱测量来通过对比率的里埃变换来提取信号.

    主要成果:

    • 拟议的DAS方案理论上可以达到1米的空间分辨率.
    • 与传统的DAS相比,系统噪声减少了三倍.
    • 该方法证明了长距离声源定位的潜力.

    结论:

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    • 量子弱测量增强的DAS提供了卓越的性能.
    • 这种先进的DAS技术在声监测和定位方面具有有前途的应用.
    • 进一步的研究可以探索实际实施和现实世界的表现.