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相关概念视频

Pressure Gauges01:20

Pressure Gauges

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Most pressure gauges, like those on scuba tanks, are calibrated to read zero at atmospheric pressure. Readings from such gauges are called the gauge pressure, which is the pressure relative to atmospheric pressure. When the pressure inside the tank exceeds atmospheric pressure, the gauge reports a positive value. Some gauges are designed to measure negative pressure. For example, many physics experiments must take place in a vacuum chamber, a rigid chamber from which some of the air is pumped...
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Design Example: Automobile Ignition System01:14

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The automobile's ignition system plays a vital role by ensuring the timely ignition of the fuel-air mixture in each cylinder. This ignition is facilitated by a spark plug, which is composed of two electrodes separated by an air gap. A spark forms across this air gap when a substantial voltage is generated between the electrodes, leading to the ignition of the fuel.
One can generate a large voltage using a car battery of 12 volts with the help of inductors. Inductors are known for opposing...
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相关实验视频

Updated: Jun 17, 2025

A Performance-testing Platform for a Conduction Micropump with an FR-4 Copper-clad Electrode Plate
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一个气体火花开关电极冲击压力测试平台.

Cheng Luo1, Yongmin Zhang1, Yong Lu1

  • 1State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an, Shaanxi, China.

The Review of scientific instruments
|August 6, 2024
PubMed
概括

一个新的压电传感器系统准确地测量了高电流气体火花开关中的电极应力. 该系统克服了电磁干扰,在电流积累期间揭示了冲击形成和影响应力波形的因素.

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Last Updated: Jun 17, 2025

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科学领域:

  • 电气工程 电气工程
  • 材料科学 材料科学 材料科学
  • 物理 物理学 物理

背景情况:

  • 高电流气体火花开关会对电极产生显著的机械应力.
  • 精确测量这种应力对于开关设计和放电理论至关重要.
  • 传统方法受到电磁干扰和高电压的阻碍.

研究的目的:

  • 设计和验证一个强大的电极冲击应力测量系统.
  • 在恶劣的排放环境中克服传统压力测量技术的局限性.
  • 在各种放电条件下分析电极应力波形的特性.

主要方法:

  • 开发一种使用PVDF (聚乙烯化物) 压电膜的应力测量系统.
  • 在高压,高电流气体火花开关中实施测量电极应力系统.
  • 在不同脉冲电容值,故障电压和负载下,对应力波形的实验研究.

主要成果:

  • 基于PVDF的系统成功测量了高电流气体火花开关排放中的电极冲击压.
  • 应力波形分析表明,冲击形成发生在初始电流积累阶段.
  • 测量的波形显示了显著的磁场力贡献以及对峰值电流,dI/dt和放电持续时间的依赖.

结论:

  • PVDF压电膜系统为测量高电流,高电压火花放电中的电极应力提供了可行的解决方案.
  • 该研究提供了关于火花放电期间电极上的动态机械效应的见解.
  • 了解这些影响对于优化气体火花开关性能和寿命至关重要.