Recovery of the free field using the spherical wave superposition method

Chuan-Xing Bi , Ding-Yu Hu , Liang Xu , Yong-Bin Zhang

As a preprocessing technique of nearfield acoustic holography, sound field separation technique could separate the non-free field into two parts: the outgoing field and the incoming field. Generally, the former is used for sound source reconstruction. In fact, the outgoing field consists of the field radiated by the source in a free-field and the field scattered on the source surface caused by the incoming field. When the scattered field could not be neglected, the reconstruction using the outgoing field would be erroneous. To separate the radiated field and scattered field, a free-field recovery technique using the spherical wave superposition method is proposed. A theoretical description is first given, and then two numerical simulations are used to demonstrate the validity of this technique.

Mots clés: sound field separation; free-field recovery; spherical wave superposition

Domaines: Acoustique [physics.class-ph]

Chuan-Xing Bi, Ding-Yu Hu, Liang Xu, Yong-Bin Zhang. Recovery of the free field using the spherical wave superposition method. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810757⟩