Sound field measurements based on reconstruction from laser projections

Author

Oikawa, Yasuhiro ; Goto, Makoto ; Ikeda, Yusuke ; Takizawa, Toshikazu ; Yamasaki, Yoshio

Author_Institution

Global Inf. & Telecommun. Studies, Waseda Univ., Tokyo, Japan

Volume

4

fYear

2005

fDate

18-23 March 2005

Abstract

In this paper, we describe some new sound field measurement methods by using a laser Doppler vibrometer (LDV). By irradiating the reflection wall with a laser, we can observe the light velocity change that is caused by the refractive index change from the change in air density. It means that it is possible to observe the change of the sound pressure. We measured a sound field projection on a 2D plane using a scanning laser Doppler vibrometer (SVM) which can visualize a sound field. And we made a 3D sound field reconstruction from some 2D laser projections based on computed tomography (CT) techniques. We made the reconstructed image for the sound field near the loudspeaker or in the room.

Keywords

acoustic field; acoustic intensity measurement; computerised tomography; data visualisation; image reconstruction; measurement by laser beam; refractive index measurement; vibration measurement; air density change; computed tomography; light velocity change; near loudspeaker reconstructed image; refractive index change; scanning laser Doppler vibrometer; sound field 3D laser projection reconstruction; sound field measurements; sound field visualization; sound pressure measurement; Acoustic reflection; Computed tomography; Image reconstruction; Laser transitions; Loudspeakers; Optical reflection; Refractive index; Support vector machines; Vibrometers; Visualization;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 2005. Proceedings. (ICASSP '05). IEEE International Conference on

ISSN

1520-6149

Print_ISBN

0-7803-8874-7

Type

conf

DOI

10.1109/ICASSP.2005.1416095

Filename

1416095