Sound field separation technique based on equivalent source method and its application in nearfield acoustic holography
Sound field separation technique based on equivalent source method and its application in nearfield acoustic holography
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基于等效源法的声场分离技术及其在近场声全息中的应用
DOI：
10.1121/1.2837489
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发表时间：
2008-03-01
影响因子：
2.4
通讯作者：
Chen, Jian
中科院分区：
文献类型：
--
作者：
Bi, Chuan-Xing;Chen, Xin-Zhao;Chen, Jian
提出了一种基于等效声源法的近距离平行测量面声场分离技术。该方法可以分离出穿过两个测量表面的波分量。这使得近场声全息术（NAH）在全息图表面两侧存在源的场、混响场或散射场中的应用成为可能。该方法应用灵活，计算简单，易于实现。测量表面可以是任意形状的，并且它们不像传统的场分离技术那样被限制为规则的。而且，由于该方法直接在空间域中执行场分离计算，而不是在波数域中，因此它避免了误差和限制（窗口效应等）。与基于空间傅立叶变换方法的传统场分离技术相关联。本文首先给出了理论描述，然后通过实验评估了所提出的场分离技术的性能及其在NAH中的应用。2008年，美国声学学会（Acoustical Society of America）
A technique for separating sound fields using two closely spaced parallel measurement surfaces and based on equivalent source method is proposed. The method can separate wave components crossing two measurement surfaces. in opposite directions, which makes nearfield acoustic holography (NAH) applications in a field where there exist sources on the two sides of the hologram surface, in a reverberant field or in a scattered field, possible. The method is flexible in applications, simple in computation, and very easy to implement. The measurement surfaces can be arbitrarily shaped, and they are not restricted to be regular as in the traditional field separation technique. And, because the method performs field separation calculations directly in the spatial domain-not in the wave number domain-it avoids the errors and limitations (the window effects, etc.) associated with the traditional field separation technique based on the spatial Fourier transform method. In the paper, a theoretical description is first given, and the performance of the proposed field separation technique and its application in NAH are then evaluated through experiments. (D 2008 Acoustical Society of America.