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相关概念视频

Weak Base Solutions03:21

Weak Base Solutions

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Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
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Weak Acid Solutions04:02

Weak Acid Solutions

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Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
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Titration of a Weak Acid with a Weak Base01:08

Titration of a Weak Acid with a Weak Base

4.9K
Weak acids and bases do not undergo dissociation completely, and titrations between these two are rarely studied. When such studies are performed, say, for the titration of a weak acid with a weak base, the titration curve plots the change in pH as a function of the volume of base added. Take the titration of acetic acid with ammonia, for instance. During the titration, these two species form ammonium acetate and water, but the pH change is slow and gradual.
As a result, there is no simple...
4.9K
Titration Calculations: Weak Acid - Strong Base03:55

Titration Calculations: Weak Acid - Strong Base

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Calculating pH for Titration Solutions: Weak Acid/Strong Base
For the titration of 25.00 mL of 0.100 M CH3CO2H with 0.100 M NaOH, the reaction can be represented as:
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The Sense of Self: Reflected Self-Appraisal and Social Comparison02:57

The Sense of Self: Reflected Self-Appraisal and Social Comparison

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According to Charles Cooley, we base our image on what we think other people see (Cooley 1902). We imagine how we must appear to others, then react to this speculation. We don certain clothes, prepare our hair in a particular manner, wear makeup, use cologne, and the like—all with the notion that our presentation of ourselves is going to affect how others perceive us. We expect a certain reaction, and, if lucky, we get the one we desire and feel good about it. But more than that, Cooley...
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Classification of Skeletal Muscle Fibers01:48

Classification of Skeletal Muscle Fibers

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Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
Slow-Twitch Muscle Fibers
Slow oxidative, muscle fibers appear red due to large numbers of capillaries and high levels of...
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相关实验视频

Updated: Jan 29, 2026

Writing Bragg Gratings in Multicore Fibers
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超弱纤维布拉格格阵列的最新进展,用于高性能分布式声学传感 (受邀)

Yihang Wang1,2, Baijie Xu1,2, Guanfeng Chen1,2

  • 1State Key Laboratory of Radio Frequency Heterogeneous Integration, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education/Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.

Sensors (Basel, Switzerland)
|January 28, 2026
PubMed
概括
此摘要是机器生成的。

超弱纤维布拉格格 (UWFBG) 阵列通过增强反射强度显著提高分布式声学传感 (DAS) 性能. 本次审查涵盖了UWFBG铭文方法及其在改进DAS系统中的应用.

关键词:
分布式声学传感传感器分布式光纤传感器传感器超薄纤维布拉格格子格子 超薄纤维布拉格格子

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科学领域:

  • 光电学是指光电子产品.
  • 光纤传感传感器是指光纤传感器.
  • 材料科学 材料科学 材料科学

背景情况:

  • 分布式声学传感 (DAS) 对各种行业至关重要,包括石油和天然气,运输和安全.
  • 使用从单模纤维 (SMF) 来使用雷利反射散射 (RBS) 的传统DAS存在信号噪声比 (SNR) 和强度的限制.
  • 超薄纤维布拉格格 (UWFBG) 阵列提供了一种解决方案,可以提高反向散射强度并提高DAS性能.

研究的目的:

  • 为高性能DAS提供UWFBG阵列的最新进展提供全面的审查.
  • 为创建UWFBG数组引入主要的铭文技术.
  • 总结UWFBG阵列在增强DAS能力方面的应用.

主要方法:

  • 关于UWFBG铭文技术的文献审查.
  • 讨论绘制塔格,通过紫外线透明涂层纤维暴露的紫外线,以及秒激光直接写作.
  • 分析UWFBG在DAS中的应用,用于增强SNR,抑制色,改善频率响应和相位噪声补偿.

主要成果:

  • 与传统的SMF相比,UWFBG阵列显著增加了反向散射强度.
  • 各种铭文方法可以为特定的DAS要求量身定制UWFBG制造.
  • 通过UWFBG集成,可以明显改善SNR和稳定性等DAS性能指标.

结论:

  • 对于高性能DAS来说,UWFBG阵列是一个显著的进步.
  • 继续研究UWFBG的铭文和应用,有望进一步提高传感能力.
  • 通过UWFBG增强的DAS技术为各种监控应用提供了巨大的前景.