Sound in flight: measurement of sound fields by use of TV holography.
Sound in flight: measurement of sound fields by use of TV holography.
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飞行中的声音：使用电视全息术测量声场。
DOI：
10.1364/ao.33.002574
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发表时间：
1994
期刊：
影响因子：
1.9
通讯作者：
O. J. Løkberg
中科院分区：
文献类型：
--
作者：
O. J. Løkberg
用时均电视全息术记录了空气中正弦振动物体传播声场的积分振幅和相位分布。利用动态相位调制技术，在真实的时间内观察到了声场的行为。场的大小和方向是通过声相位步进和图像处理来确定的。场是三维的，为了进行完整的描述，需要记录几个横截面，但在许多情况下，通过二维投影可以获得有价值的信息。该技术已用于研究扩展源的声音传播和声音发射细节。
The integrated amplitude and phase distribution of the sound field propagating from sinusoidally vibrating objects in air have been recorded by time-averaged TV holography. The behavior of the sound field is observed in real time by use of dynamic phase modulation. The magnitude and direction of the field are found by acoustic phase stepping and image processing. The field is three dimensional, and recordings of several cross sections are necessary for a complete description, but in many cases valuable information can be obtained by two-dimensional projections. The technique has been used to study sound propagation and details in the sound emission from extended sources.