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
-
Improvement of Crack Sizing Performance by using Nonlinear Ultrasonic Technique
Date2015.09.16 CategoryInternational Views104087 -
Laser ultrasonic inspection in ablation regime
Date2015.09.16 CategoryInternational Views132384 -
Influence of laser beam profiles on the frequency bandwidth of laser-generated surface acoustic waves
Date2015.09.16 CategoryInternational Views121899 -
Real-time detection of surface cracks on silicon wafers during laser beam irradiation
Date2015.09.16 CategoryInternational Views249537 -
Influence of repetitive pulsed laser irradiation on the surface characteristics of an aluminum alloy in the melting regime
Date2015.09.16 CategoryInternational Views282215 -
Non-Contact Evaluation of Acoustic Nonlinearity of a Laser-Generated Surface Wave in a Plastically Deformed Aluminum Alloy
Date2015.09.16 CategoryInternational Views160132 -
Relationship between Second- and Third-order Acoustic Nonlinear Parameters in Relative Measurement
Date2015.09.16 CategoryInternational Views138568 -
Non-contact Measurement of Elastic Modulus by using Laser Ultrasonic
Date2015.09.16 CategoryInternational Views232420 -
Relative Measurement of Acoustic Nonlinear Parameters and Comparison of Sensitivity to Thermal Aging
Date2015.09.16 CategoryInternational Views117538 -
Demonstration of Disturbance Propagation and Amplification in Car-Following Situation for Enhancement of Vehicle Platoon System
Date2015.09.16 CategoryInternational Views147699 -
Nanotribological and wetting performance of hierarchical patterns
Date2016.02.23 CategoryInternational Views123487 -
Comparison of Ultrasonic Nonlinear Parameters Measured by PZT and LiNbO3 Transducers
Date2017.01.16 CategoryInternational Views140256 -
Experimental Comparison of Nonlinear Parameters Obtained from Absolute Measurement and Relative Measurement
Date2017.01.16 CategoryInternational Views168161 -
Absolute Measurement and Relative Measurement of Ultrasonic Nonlinear Parameter
Date2017.01.16 CategoryInternational Views303072 -
Assessment of Thermal Aging of Aluminum Alloys by Acoustic Nonlinearity Measurement of Surface Acoustic Waves
Date2017.01.16 CategoryInternational Views124131 -
Assessment of Thermal Degradation by Cumulative Variation of Ultrasonic Nonlinear Parameter
Date2017.01.16 CategoryInternational Views207819 -
Finite element analysis of a low-velocity impact test for glass fiber-reinforced polypropylene composites considering mixed-mode interlaminar fracture toughness
Date2018.06.14 CategoryInternational Views99187 -
A Method to Estimate the Absolute Ultrasonic Nonlinearity Parameter from Relative Measurements
Date2018.06.14 CategoryInternational Views86813 -
Relative Measurement of the Acoustic Nonlinearity Parameter using Laser Detection of an Ultrasonic Wave
Date2018.06.14 CategoryInternational Views100157 -
Dependence of Nonlinear Ultrasonic Characteristic on Second-Phase Precipitation in Heat-Treated Al 6061-T6 alloy
Date2018.11.28 CategoryInternational Views74257