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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 4, Iss. 5 — May. 5, 2009

Simple, all-optical, noncontact, depth-selective, narrowband surface acoustic wave measurement system for evaluating the Rayleigh velocity of small samples or areas

Hsiao-Chuan Wang, Simon Fleming, and Yung-Chun Lee  »View Author Affiliations

Applied Optics, Vol. 48, Issue 8, pp. 1444-1451 (2009)

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In this paper a new ultrasonic testing system is described that utilizes noncontact optical methods to generate and detect surface acoustic waves (SAWs) and has significant applications in the nondestructive evaluation of surface material. A narrowband SAW is generated with a new and straightforward grating mask image projection method that provides fast switching and a controllable frequency band, and hence control of the penetration depth of the ultrasonic wave. A narrowband SAW with center frequency above 30 MHz , and hence better depth resolution, is generated. The detection of the SAW is performed with a simplified design of an optical fiber interferometer that has good sensitivity and manoeuvrability without requiring additional auxiliary components. The novel combination of these two optical techniques permits the measurement of small samples that are otherwise difficult to measure, especially nondestructively. A model was constructed to simulate the temporal characteristics of the generated narrowband SAW and showed good agreement with experiment. Measurements on an aluminum sample and an extracted human incisor demonstrate the system’s performance.

© 2009 Optical Society of America

OCIS Codes
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(240.6690) Optics at surfaces : Surface waves
(280.3375) Remote sensing and sensors : Laser induced ultrasonics

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: February 6, 2009
Manuscript Accepted: February 9, 2009
Published: March 3, 2009

Virtual Issues
Vol. 4, Iss. 5 Virtual Journal for Biomedical Optics

Hsiao-Chuan Wang, Simon Fleming, and Yung-Chun Lee, "Simple, all-optical, noncontact, depth-selective, narrowband surface acoustic wave measurement system for evaluating the Rayleigh velocity of small samples or areas," Appl. Opt. 48, 1444-1451 (2009)

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