Sound field determination and projection effects using laser vibrometry
Sound field determination and projection effects using laser vibrometry
复制标题
使用激光测振法确定声场和投影效果
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
K. Tatar
中科院分区：
文献类型：
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作者：
E. Olsson;K. Tatar
激光测振法测量声音的优点是可以通过扫描获得现场测量结果。它是一种非接触的方法，提供定性和定量信息。然而，必须注意的是，测量是沿着探测光束路径的积分。通过测量和计算研究了这种投影的一些影响。声场计算是根据测量到的表面振动进行的，它们与测量到的声场吻合得很好。计算表明，预测结果在很大程度上取决于积分深度或探测深度等参数以及震源的方位。除此之外，计算或测量的振幅会随着波长和与声源的距离而增强。这种增强甚至可以导致振幅随着距离的增加而增加。尽管这使得所获得的定量数据不可信，但这对定性结果变得更加清晰是一种好处。
Sound measurements using laser vibrometry have the advantage that field measurement can be obtained through scanning. It is a non-contact method that provides both qualitative and quantitative information. However, it must be noted that the measurement is an integral along the path of the probing beam. Some effects of this projection are investigated both through measurements and calculations. The sound field calculations are made from measured surface vibrations and they are in good agreement with the measured sound field. The calculations show that the projections very much depend on parameters such as integral depth, or probing depth, and the orientation of the sources. In addition to this, the calculated, or measured, amplitude experiences an enhancement which depends on the wavelength and the distance from the sound source. This enhancement can even result in increasing amplitude with distance. Even though this makes the quantitative data obtained not trustworthy, it is a benefit for the qualitative results which become clearer.