Optically Detecting Wavefronts and Wave Speeds in Water Using Refracto-Vibrometry
Optically Detecting Wavefronts and Wave Speeds in Water Using Refracto-Vibrometry
复制标题
使用折射振动测量法光学检测水中的波前和波速
DOI：
10.1007/978-3-319-30084-9_9
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Huber, Thomas M.
中科院分区：
文献类型：
--
作者：
Huber, Matthew T.;Hoffmeister, Brent K.;Huber, Thomas M.
折射测振法是一种使用激光多普勒测振仪测量声压场的技术。振动计激光器通过介质朝向静止的回射表面被引导。当光束从振动计行进到后向反射器并返回时，波前穿过激光器的声波（密度变化）引起集成光路长度的变化。这导致返回到振动计的激光信号的时变调制，从而实现声波阵面的光学检测。在当前的实验中，Polytec PSV-400扫描激光多普勒振动计以100 MHz采样，监测浸没在水箱中的1 MHz Panametrics V303超声换能器发出的波。振动计在多个扫描点检测到的时变信号用于生成声波阵面时间演变的视频;这些视频将被呈现。折射振动测量法还用于光学测量超声波通过不同材料的飞行时间，包括铅和人造骨样品。这使得能够确定波的传播速度。使用折射振动仪与光学检测获得的波速与使用传统的超声换能器检测波前的测量结果一致。
Refracto-vibrometry is a technique that uses a laser Doppler vibrometer to measure acoustic pressure fields. The vibrometer laser is directed through a medium towards a stationary retroreflective surface. Acoustic waves (density variations) for which the wavefronts pass through the laser, as the beam travels from the vibrometer to the retroreflector and back, cause variations in the integrated optical path length. This results in a time-varying modulation of the laser signal returning to the vibrometer, enabling optical detection of the acoustic wavefronts. In the current experiment, a Polytec PSV-400 scanning laser Doppler vibrometer, sampled at 100 MHz, monitored the waves emitted by a 1 MHz Panametrics V303 ultrasound transducer immersed in a water tank. The time-varying signal detected by the vibrometer at numerous scan points was used to generate videos of the time evolution of acoustic wavefronts; these videos will be presented. Refracto-vibrometry was also used for optical measurements of the time of flight of ultrasonic waves through different materials, including samples of lead and fabricated bone. This enabled determination of wave propagation speeds. The wave speeds obtained with optical detection using refracto-vibrometry were in agreement with measurements using a conventional ultrasonic transducer to detect the wavefronts.
DOI：
--
发表时间：
2006
期刊：
影响因子：
--
作者：
E. Olsson;K. Tatar
通讯作者：
K. Tatar
影响因子：
4.7
作者：
Malkin, Robert;Todd, Thomas;Robert, Daniel
通讯作者：
Robert, Daniel