Influence of laser beam profiles on the frequency bandwidth of laser-generated surface acoustic waves
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6928267
Influence of laser beam profiles on the frequency bandwidth of laser-generated surface acoustic waves
The frequency characteristics of laser-generated surface acoustic waves (SAWs) were investigated depending on laser beam profiles. The laser-generated SAWs were analytically and experimentally compared when using the single-line laser beams of Gaussian and square-like energy profiles. Also, the line-arrayed laser beam in the square-like energy distribution was introduced to generate the SAW that had a narrow frequency bandwidth. The results from both the experiments and the simulations showed the similar distinction of the frequency characteristics in between using Gaussian and square-like laser energy profiles. The SAW by the Gaussian laser beam showed only single peak in the frequency spectrum, whereas the odd harmonic frequency components appeared in the case of using the square-like laser beams. Moreover, the SAW by the line-arrayed laser beam had narrower frequency bandwidth than the SAW by the single-line laser beam. These results were in good agreement with the theoretical predictions, which supports that laser-generated SAWs have the advantage of frequency modulation by modifying the spatial energy profile of a laser beam.
Published in:
Nondestructive Evaluation/Testing (FENDT), 2014 IEEE Far East Forum onDate of Conference:
20-23 June 2014- Page(s):
- 221 - 224
- Print ISBN:
- 978-1-4799-4731-7
- INSPEC Accession Number:
- 14694393
- Conference Location :
- Chengdu
- DOI:
- 10.1109/FENDT.2014.6928267
- Publisher:
- IEEE
-
Laser ultrasonic inspection in ablation regime
-
Internal defect detection using laser-generated longitudinal waves in ablation regime
-
Initiation time of near-infrared laser-induced slip on the surface of silicon wafers
-
Influence of slit width on harmonic generation in ultrasonic surface waves excited by masking a laser beam with a line arrayed slit
-
Influence of repetitive pulsed laser irradiation on the surface characteristics of an aluminum alloy in the melting regime
-
Influence of laser beam profiles on the frequency bandwidth of laser-generated surface acoustic waves
-
Indirect Method for Measuring Absolute Acoustic Nonlinearity Parameter Using Surface Acoustic Waves with a Fully Non-Contact Laser-Ultrasonic Technique
-
In-situ and Layer-by-layer Grain Size Estimation of Additively Manufactured Metal Components using Femtosecond Laser Ultrasonic Technique (Submitted)
-
In-Line Ultrasonic Monitoring for Sediments Stuck on Inner Wall of a Polyvinyl Chloride Pipe
-
In situ detection of laser-induced slip initiation on the silicon wafer surface
-
Improvement of Crack Sizing Performance by using Nonlinear Ultrasonic Technique
-
Imaging of Defects in Thin Plate by Scanning of Laser-generated Focused-Lamb Waves
-
Imaging of contact acoustic nonlinearity using synthetic aperture technique
-
Harmonic generation of an obliquely incident ultrasonic wave in solid-solid contact interfaces
-
Harmonic generation of an obliquely incident ultrasonic wave in solid-solid contact interfaces
-
GENERATION OF WAVELENGTH-MATCHED GUIDED WAVE IN TUBE BY ARRAYED LASER BEAM METHOD
-
Generation and Measurement of Gigahertz Ultrasonic Waves in Additively Manufactured Thin Metal Components using Femtosecond Laser and Application to In-situ Grain size Monitoring (Submitted)
-
Full-range stress–strain curve estimation of aluminum alloys using machine learning-aided ultrasound
-
Frequency Response of Narrowband Surface Waves Generated by Laser Beams Spatially Modulated with a Line-arrayed Slit Mask
-
Finite element analysis of a low-velocity impact test for glass fiber-reinforced polypropylene composites considering mixed-mode interlaminar fracture toughness