アレー式マイクロホンを低周波音測定に適用するときの球面波補正法(機械力学,計測,自動制御)

抄録

In using a microphone array to measure low frequency sound, it is not sufficient to assume plane wave incidence. First, this paper theoretically discusses the directivity of the microphone array in case the incident wave is spherical. When the incident wave is spherical, the directivity of the microphone array spreads. Then, a correction method is proposed to improve the directivity. This correction method is called a spherical wave correction method here. Next, in order to verify experimentally the validity of the spherical wave correction method, corresponding experiments were conducted. The experimental results were compared with the theoretical results and they were found to be in good agreement.