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Narrow band laser-generated surface acoustic waves using a formed source in the ablative regime.

Shant Kenderian1, B Boro Djordjevic, Robert E Green

  • 1Center for Nondestructive Evaluation, The Johns Hopkins University, 810 Wyman Park Drive-Suite G010, Baltimore, Maryland 21211, USA. shant@jhu.edu

The Journal of the Acoustical Society of America
|February 1, 2003
PubMed
Summary

A novel laser acoustic signal generation method uses a lenticular array to create signals compatible with broadband receivers. This research details a theoretical model supporting experimental findings on surface acoustic wave frequency content.

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Area of Science:

  • Acoustic Engineering
  • Laser-Ultrasound

Background:

  • Laser-generated ultrasound (LGU) is a non-destructive testing technique.
  • Broadband receivers are essential for capturing wide-frequency acoustic signals.

Purpose of the Study:

  • To develop a narrow band laser-generated acoustic signal using a lenticular array.
  • To model the frequency content of surface acoustic waves generated by a line array source.

Main Methods:

  • Utilized a 4-element lenticular array for laser acoustic signal generation.
  • Developed an analytical model based on Lamb's problem for surface acoustic wave propagation.
  • Applied filtering functions to match theoretical results with experimental receiver bandwidth.

Main Results:

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  • The lenticular array produced acoustic signals with frequency content suitable for broadband receivers.
  • The theoretical model accurately predicted surface acoustic wave behavior.
  • Experimental and theoretical results demonstrated good agreement.

Conclusions:

  • A lenticular array is effective for generating tunable laser-induced acoustic signals.
  • The developed analytical model provides insight into LGU frequency characteristics.
  • This method enhances compatibility between laser sources and broadband acoustic receivers.