Measurement of large ultrasonic displacements with an optical probe

Author

Barriére, Christophe ; Royer, Daniel

Author_Institution

Lab. Ondes et Acoustique, Paris VII Univ., France

Volume

2

fYear

2001

fDate

2001

Firstpage

1105

Abstract

A simple method suitable for extracting large mechanical displacements from the phase modulation of an optical beam reflected from a moving surface is presented. This phase is obtained from a digital processing of the output signals of an analog quadrature demodulation circuit. In the MHz range, transient displacements larger than the optical wavelength have been measured with a standard heterodyne interferometer. Performances and limitations of this technique are discussed

Keywords

demodulation; heterodyne detection; light interferometers; phase modulation; probes; ultrasonic measurement; ultrasonic transducers; analog quadrature demodulation circuit; digital processing; heterodyne interferometer; mechanical displacements; moving surface; optical probe; optical wavelength; output signals; phase modulation; transient displacements; ultrasonic displacements; Displacement measurement; Optical beams; Optical interferometry; Optical mixing; Optical modulation; Optical surface waves; Phase modulation; Probes; Signal processing; Ultrasonic variables measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 2001 IEEE

Conference_Location

Atlanta, GA

Print_ISBN

0-7803-7177-1

Type

conf

DOI

10.1109/ULTSYM.2001.991912

Filename

991912