Optical measurement of sound using time-varying laser speckle patterns
Optical measurement of sound using time-varying laser speckle patterns
复制标题
使用时变激光散斑图案对声音进行光学测量
DOI：
10.1117/12.874707
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Leung T
中科院分区：
文献类型：
--
作者：
Leung T
在这项工作中，我们介绍了一种测量声音的光学技术。该技术涉及将相干脉冲激光束指向测量部位的表面，并使用 CCD 相机捕获随时间变化的散斑图案。声音表现为表面的振动，随着时间的推移，引起散斑图案的周期性平移。使用并行散斑检测方案，可以捕获并处理随时间变化的散斑图案的动态，以产生声音的频谱信息。一个潜在的临床应用是测量大脑的病理声音作为筛查测试。我们进行了实验来演示使用头部模型的检测方案的原理。结果表明，该检测方案可以测量100至2000 Hz之间的单频声音的频谱。该检测方案在平面几何形状和解剖头部几何形状中同样有效。然而，当前的检测方案对于去相关时间为几毫秒的活体生物组织来说太慢。已提出进一步改进的建议。
In this work, we introduce an optical technique to measure sound. The technique involves pointing a coherent pulsed laser beam on the surface of the measurement site and capturing the time-varying speckle patterns using a CCD camera. Sound manifests itself as vibrations on the surface which induce a periodic translation of the speckle pattern over time. Using a parallel speckle detection scheme, the dynamics of the time-varying speckle patterns can be captured and processed to produce spectral information of the sound. One potential clinical application is to measure pathological sounds from the brain as a screening test. We performed experiments to demonstrate the principle of the detection scheme using head phantoms. The results show that the detection scheme can measure the spectra of single frequency sounds between 100 and 2000 Hz. The detection scheme worked equally well in both a flat geometry and an anatomical head geometry. However, the current detection scheme is too slow for use in living biological tissues which has a decorrelation time of a few milliseconds. Further improvements have been suggested.
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影响因子：
2.8
作者：
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通讯作者：
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