Mapping of airborne ultrasonic fields using optical heterodyne probing and tomography reconstruction

Author

Matar, O. Bou ; Rossignol, C. ; Pizarro, L. ; Santos, S. Dos ; Patat, F.

Author_Institution

LUSSI - EIVL, Blois, France

Volume

2

fYear

2000

fDate

36800

Firstpage

1117

Abstract

The application of an acousto-optic method to the measurement of airborne ultrasound is described. The method consists of an optical heterodyne interferometric probing of the pressure field emitted by a transducer combined with tomographic algorithm. The method is very sensitive in air (2 10^-4 Pa / √Hz). The measurements of the ultrasonic fields are improved by screening the sound path from the surrounding to prevent from air disturbation. The temperature is measured to compensate velocity variations. Moreover, direct measurements in the cross-section are in good agreement with forward projections, using an inhomogeneous plane waves

Keywords

acoustic tomography; light interferometry; ultrasonic measurement; acousto-optic method; airborne ultrasonic fields mapping; forward projections; inhomogeneous plane waves; optical heterodyne probing; tomography reconstruction; Acoustic transducers; Optical interferometry; Optical mixing; Optical sensors; Stimulated emission; Temperature measurement; Tomography; Ultrasonic imaging; Ultrasonic transducers; Ultrasonic variables measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 2000 IEEE

Conference_Location

San Juan

ISSN

1051-0117

Print_ISBN

0-7803-6365-5

Type

conf

DOI

10.1109/ULTSYM.2000.921521

Filename

921521