水中机械波传播获得的同步光学扫描仪

A. Guessoum
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引用次数: 0

摘要

众所周知,光与受机械波扰动的介质相互作用会引起衍射现象。用Raman-Nath的正弦超声理论和Mertens-Hereman的调幅超声理论解释了这种衍射现象。本文对调频超声波对激光束的衍射现象进行了理论研究。得到的结果表明,每个衍射阶位在调制波信号的节奏中周期性地围绕一个中心位置振荡。衍射阶的扫描频率随调制信号的频率呈线性增加,且频率偏移的增加导致角偏移的增加。所有的理论结果都得到了实验的证实。此外,利用衍射阶角偏移的实验测量,可以很容易地获得高精度的调频指数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Simultaneous Optical Scanners Obtained by the Mechanical Wave Propagation in Water
As it is well known, the light interaction with a perturbed medium by a mechanical wave provokes the diffraction phenomenon. This diffraction has been explained by Raman-Nath’s theory for sinusoidal ultrasonic wave and Mertens-Hereman’s theory for amplitude modulated (AM) ultrasonic wave. In this paper, a theoretical development has been performed of the diffraction phenomenon of a laser beam by a frequency modulated (FM) ultrasonic wave. The obtained results show that each diffracted order position oscillates periodically around a central position, in the rhythm of the modulating wave signal. Moreover, the scanning frequency of the diffraction order increases linearly according to the frequency of the modulating signal, in addition the increase in the frequency excursion leads to the increase of the angular excursion. All the theoretical results are experimentally confirmed. Furthermore, the frequency modulation index has been easily obtained with good precision using experimental measurements of a diffracted order angular excursion.
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