Phase sensitive laser probe for high-frequency surface acoustic wave measurements
Phase sensitive laser probe for high-frequency surface acoustic wave measurements
复制标题
用于高频表面声波测量的相敏激光探头
DOI：
10.1109/t-su.1978.31045
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发表时间：
1978
期刊：
影响因子：
--
通讯作者：
H. Engan
中科院分区：
文献类型：
--
作者：
H. Engan
表面声波的现场测量可以用相干光以几种方式进行。描述了一种将激光聚焦到表面上的一个小光点以获得相位和幅度信息的方法。采用了一种改进的刀口技术，结合了激光的幅度调制和表面波的单边带调制。事实证明，该仪器是一种强大而灵活的分析工具。它能够从行波中提取相位和幅度信息，而部分驻波可以用它的两个行波分量的相位和幅度来表征。该装置的使用频率已高达450 MHz。
Field measurements of surface acoustic waves can be performed by coherent light in several ways. A method is described where a laser beam is focused to a small spot on the surface to obtain phase and amplitude infomation. A modified knife-edge technique has been applied in combination with amplitude modulation of the laser beam and single-side-band modulation of the surface wave. The apparatus has proven to be a powerful and flexible analytical tool. It is able to retieve phase and amplitude information from a traveling wave, and a partially standing wave can be characterized in terms of phase and amplitude of its two haveling wave components. The apparatus has been used up to 450 MHz.