热弹性波浪的产生及其纵向波浪传播的测量通过显微光学干扰仪的显微光学干扰仪
Kazuki Tamura1, Ken-Ya Hashimoto2, Shinpei Okawa1
1Hamamatsu University School of Medicine, 1-20-1 Handayama, Chuo-ku, Hamamatsu city, Shizuoka 431-3192, Japan.
Ultrasonics
|April 30, 2024
概括
这项研究比较了使用Michelson和Sagnac干扰仪进行脉冲热弹性波测量的激光超声波. 萨格纳克干扰仪提供了更好的信号噪声比率,同时将两者结合起来缩短了测量时间.
科学领域:
- 物理 物理学 物理
- 材料科学 材料科学 材料科学
- 光学工程是指光学工程.
背景情况:
- 激光超声波是一种非接触式方法,用于弹性波分析.
- 光学干扰仪对于跟踪表面位移至关重要.
- 脉冲热弹性波需要精确的测量技术.
研究的目的:
- 为了比较迈克尔森和萨格纳克干扰仪测量脉冲热弹性波的性能.
- 为了评估数值估计的萨格纳克干扰仪输出的准确性.
- 为了确定干扰仪的最佳组合,以进行高效的测量.
主要方法:
- 利用激光超声波与脉冲激光产生热弹性波.
- 使用迈克尔森和萨格纳克干扰仪来测量外平面位移.
- 将实验结果与数值模拟的萨格纳克干扰仪输出进行了比较.
主要成果:
- 萨格纳克干涉仪实现了比迈克尔森 (14.9dB) 高的信号噪声比率 (19.2dB).
- 迈克尔森干扰仪证明了优越的位移输出线性,使声压计算成为可能.
- 数字估计的萨格纳克输出与实验数据相匹配,验证了模拟.
结论:
- 萨格纳克干扰仪对于脉冲热弹性波探测更为敏感.
- 结合Michelson和Sagnac干扰仪,可以缩短测量时间,而不会影响数据质量.
- 迈克尔森干扰仪的线性对于定量压力分析是有利的.
相关概念视频
01:07Propagation of Waves
2.3K
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
2.3K
01:28Standing Waves in a Cavity
914
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
914