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Proceedings Paper

Ultrasonic displacement measurement using self-mixing interferometry
Author(s): Ming Wang; Shouping Nie; Dacheng Li
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Paper Abstract

We describe a method for the ultrasonic displacement measurement in a small volume based on self-mixing effect in a laser diode. The interference signal (mode-hop signal) is modulated with injection variation and demodulated by signal analysis. The interference signal due to the vibration of a testing example under the ultrasonic excitation is used for a determination of the sound displacement. Self-mixing interferometer is used, because it is much simper than the conventional interferometers. Many optical elements like the beamsplitter, reference mirror, and external photodetector are not required. Theoretical analysis and experimental method are presented. The vibration of a PZT transducer-driven sample was measured with resolution of sub-micron.

Paper Details

Date Published: 19 June 2002
PDF: 5 pages
Proc. SPIE 4778, Interferometry XI: Applications, (19 June 2002); doi: 10.1117/12.473549
Show Author Affiliations
Ming Wang, Nanjing Normal Univ. (China)
Shouping Nie, Nanchang Univ. (China)
Dacheng Li, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 4778:
Interferometry XI: Applications
Wolfgang Osten, Editor(s)

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