Bragg Diffraction Sampling of a Sound Field
Bragg Diffraction Sampling of a Sound Field
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声场的布拉格衍射采样
DOI：
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发表时间：
1972
期刊：
影响因子：
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通讯作者：
M. Ahmed
中科院分区：
文献类型：
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作者：
A. Korpel;W. Kessler;M. Ahmed
本文描述了一种用聚焦光束探测三维声场的新方法。在我们的方法中，通过使用偏振敏感元件或放置在光电二极管前面的空间滤光片来提取声音对光的时空调制。该技术本身具有高分辨率采样的能力，因为如图所示，所产生的射频电流的相位和振幅表明了光束焦点周围狭窄区域内的复杂声压。这与使用窄准直光束的早期方法形成对比，后者仅给出声压振幅和相位积分在光束穿过的整个声场宽度上的指示。本文第一部分分析了操作模式，并以启发式的方式讨论了灵敏度和分辨力。第二部分给出了不同频率和声音介质下的实验结果。第三部分论述了严谨的……
In this paper we describe a novel method of probing a sound field in three dimensions with a focused light beam. In our method, the spatial‐temporal modulation impressed upon the light by the sound is extracted by the use of either polarization sensitive elements or spatial filters placed in front of a photodiode. The technique is inherently capable of high‐resolution sampling because, as is shown, phase and amplitude of the resulting rf current are indicative of the complex sound pressure in a narrow region around the focus of the light beam. This is in contrast to earlier methods using a narrow collimated light beam which only give an indication of sound‐pressure amplitude and phase integrated over the entire width of the sound field traversed by the light beam. The first part of the paper analyzes the mode of operation and discusses sensitivity and resolution in a heuristic manner. The second part provides experimental results for various frequencies and sound media. The third part treats the rigorous ...