A tomographic visualization of sound fields using laser diffraction

Acoustical Science and Technology

Masahiro Yoshioka¹  Keinosuke Nagai¹  Koichi Mizutani¹ 

[1] Institute of Engineering Mechanics and Systems,University of Tsukuba,Tsukuba-Science City,305-8573 Japan

关键词: Tomography;    Laser diffraction;    Sound field imaging;    Raman-Nath approximation;   

DOI  :  10.1250/ast.21.1

学科分类：声学和超声波

来源: Acoustical Society of Japan

【 摘 要 】

References(10)Cited-By(2)In this study, we propose a method for non-contact visualization of sound fields, generated by an ultrasonic transducer, with the use of laser diffraction.The fundamental operational principle is based on optical computerized tomography(CT).The reconstructed, two-dimensional images are the amplitude and the phase distributions of the sound fields.In order to acquire this information of the sound fields, we used a laser beam as an optical probe.The laser beam passed through a sound field perpendicular to the sound beam and was detected without any optical system by a photodiode on the opposite side.In our experiment, we used a circular transducer driven at a frequency of 1.412MHz for a sound source.The experimental results were approximately in agreement with the results we obtained by measuring with a hydrophone.

【 授权许可】

Unknown