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相关概念视频

Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

32
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 short...
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Doppler Effect - II01:05

Doppler Effect - II

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The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
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Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
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相关实验视频

Updated: Jun 24, 2025

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

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时间域基于维尼尔效应的光纤传感器

Chunyang Han, Kechuang Han, Mengzhen Song

    Optics letters
    |June 2, 2024
    PubMed
    概括
    此摘要是机器生成的。

    我们开发了一个简单的光纤传感器,使用Vernier效应来提高灵敏度. 这种新的设计避免了复杂的制造和专用设备,使其非常适合实际的传感应用.

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    A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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    相关实验视频

    Last Updated: Jun 24, 2025

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    A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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    A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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    科学领域:

    • 光子学和传感技术的技术.
    • 光纤传感器 光纤传感器
    • 干涉测量是干涉测量的方法.

    背景情况:

    • 传统的光学传感器通常需要复杂的制造和专门的设备.
    • 提高传感器灵敏度通常涉及复杂的设计修改或先进的组件.
    • 维尼尔效应为干扰计系统中信号放大提供了一个潜在的途径.

    研究的目的:

    • 为了展示一种新的,易于制造的基于Vernier效应的时间域传感器.
    • 为了在没有复杂的程序的情况下实现光学传感的增强灵敏度.
    • 为广泛应用提供具有成本效益和实用的传感器设计.

    主要方法:

    • 使用全纤维可变光延迟线 (VODL) 驱动两个干扰仪的同时OPD扫描.
    • 采用纤维布拉格格 (FBGs) 来过两个稍微脱节的时间域干扰度信号.
    • 通过规范化的干涉图与不同的空间频率来生成维尼尔信封,用于信号调制.

    主要成果:

    • 与原生干扰仪相比,通过维尼尔包膜调制实现了增强的灵敏度.
    • 证明灵敏度放大可以通过改变FBG共振波长差异来调整,而不是OPD.
    • 证实了传感器独立于精确而复杂的制造程序.
    • 在不需要宽带光源和光谱仪的情况下展示了维尼尔信号解调.

    结论:

    • 拟议的传感器为基于维尼尔效应的传感提供了一种简单且具有成本效益的方法.
    • 该设计的易于制造和操作使其适用于实际应用.
    • 这项工作可能会激发开发可访问和高性能光学传感器的新概念.