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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
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.
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:
- 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.