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Electronic Distance Measuring Instruments01:30

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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 short...
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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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利用电磁数据进行海源估计:全面审查

Toshitaka Baba1, Zhiheng Lin2, Takuto Minami3

  • 1Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima, Japan.

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海底电磁计 (OBEM) 通过测量磁场波动来探测海,显示出有前途的潜力. 虽然面临着噪音挑战,但OBEM提供了独特的速度场观测,补充了传统的压力表.

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电磁观测是一种电磁观测.运动的诱导感应.海的逆转是海的逆转.观测海的观测工作

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科学领域:

  • 地质物理学 地质物理学
  • 海洋学 海洋学 海洋学
  • 电磁主义 电磁主义

背景情况:

  • 海底压力表是海监测的标准.
  • 最近的研究表明,海期间的磁场波动.
  • 海底电磁计 (OBEM) 成为一种潜在的替代技术.

研究的目的:

  • 综合有关海磁场的发现及其在源估计中的使用.
  • 为了评估OBEMs对海观测的有效性.
  • 为了将OBEM与传统压力表进行比较.

主要方法:

  • 对海引起的磁场最近的研究进行了审查和综合.
  • 对相关频段的OBEM数据特征进行分析.
  • 对用于海检测和表征的OBEM和压力表的比较评估.

主要成果:

  • 电磁观测显示,有可能检测到小规模海 (厘米尺度).
  • 在关键的海频率下,OBEM的背景噪音大约是压力表的10倍.
  • 地球的磁场可以干扰海的磁场检测.

结论:

  • OBEM 提供了一种对海监测压力表的补充方法.
  • OBEM的一个关键优势是它们能够测量海速度场.
  • 需要进一步的研究来克服噪音限制,并优化对海观测的OBEM.