Ming-Te Cheng J. Adin Mann III
Dept. of Aerosp. Eng. and Eng. Mech., Iowa State Univ., Ames, IA 50010
The objective of this paper is to investigate sound scattering of a rigid scatterer using a two-plane cylindrical acoustic holography method. A piston source, which is vibrating sinusoidally, illuminates a scatterer. The superimposed incident and scattered fields are measured in the near field of the scatterer using cylindrical acoustic holography. These two fields are decomposed in the wave-vector domain in order to extract the scattered field. Numerical simulations are performed and the effect of various parameters is investigated. Specifically, the distance between the two-holography cylinder, the sampling rate, and the aperture size are investigated in the field separation technique. In addition, experimental studies were conducted inside an anechoic chamber with a baffled loudspeaker as a source and a cylinder as a scatterer. The decomposed scattered field is then used to estimate the far-field target strength. The near-field scattering is also investigated.