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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 22 — Oct. 30, 2006
  • pp: 10435–10440

Spatially resolved acoustic spectroscopy for fast noncontact imaging of material microstructure

Steve D. Sharples, Matthew Clark, and Mike G. Somekh  »View Author Affiliations


Optics Express, Vol. 14, Issue 22, pp. 10435-10440 (2006)
http://dx.doi.org/10.1364/OE.14.010435


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Abstract

We have developed a noncontact and nondestructive technique that uses laser-generated and detected surface acoustic waves to rapidly determine the local acoustic velocity, in order to map the microstructure of multi-grained materials. Optical fringes excite surface waves at a fixed frequency, and the generation efficiency is determined by how closely the fringe spacing matches the acoustic wavelength in the excitation region. Images of titanium alloys are presented, acquired using the technique. Methods to improve the current lateral resolution of 0.8mm are discussed, and the ability to measure velocity change to an accuracy of one part in 3300 is experimentally demonstrated.

© 2006 Optical Society of America

OCIS Codes
(110.5120) Imaging systems : Photoacoustic imaging
(110.7170) Imaging systems : Ultrasound
(300.0300) Spectroscopy : Spectroscopy
(350.3850) Other areas of optics : Materials processing

ToC Category:
Imaging Systems

History
Original Manuscript: July 14, 2006
Revised Manuscript: September 28, 2006
Manuscript Accepted: October 16, 2006
Published: October 30, 2006

Citation
Steve D. Sharples, Matthew Clark, and Mike G. Somekh, "Spatially resolved acoustic spectroscopy for fast noncontact imaging of material microstructure," Opt. Express 14, 10435-10440 (2006)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-14-22-10435


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References

  1. M. G. Somekh, G. A. D. Briggs, and C. Ilett, "The effect of elastic-anisotropy on contrast in the scanning acoustic microscope," Philosophical magazine A-Physics of condensed matter structure defects and mechanical properties 49, 179-204 (1984). [CrossRef]
  2. C. F. Quate, "Acoustic microscopy: recollections," IEEE Trans. Sonics Ultrason. SU-32, 132 (1985). [CrossRef]
  3. R. S. Gilmore, Ultrasonic Instruments and Devices II, vol. 24 of Physical Acoustics, chap. 5, pp. 275-346 (Academic Press, San Diego, CA, USA, 1999). (Editors: R N Thurston and Allan D Pierce).
  4. S. Sathish and R. W. Martin, "Quantitative imaging of Rayleigh wave velocity with a scanning acoustic microscope," IEEE Trans. Ultrason. Ferroelectr. Freq. Control 49, 550-557 (2002). [CrossRef] [PubMed]
  5. S. Sathish, R. W. Martin, and T. J. Moran, "Local surface skimming longitudinal wave velocity and residual stress mapping," J. Acoust. Soc. Am. 115, 165-171 (2004). [CrossRef] [PubMed]
  6. M. Clark, S. D. Sharples, and M. Somekh, "Laser ultrasonic microscopy," Materials Evaluation 60, 1094-1098 (2002).
  7. S. D. Sharples, M. Clark, and M. G. Somekh, "All-optical adaptive scanning acoustic microscope," Ultrasonics 41, 295-299 (2003). [CrossRef] [PubMed]
  8. Y. Hong, S. D. Sharples, M. Clark, and M. G. Somekh, "Rapid measurement of surface acoustic wave velocity on single crystals using an all-optical adaptive scanning acoustic microscope," Appl. Phys. Lett. 83, 3260-3262 (2003). [CrossRef]

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