Influence of laser beam profiles on the frequency bandwidth of laser-generated surface acoustic waves

Hogeon Seo, Sungho Choi, Kyung Young Jhang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

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.

Original languageEnglish (US)
Title of host publicationFENDT 2014 - Proceedings, 2014 IEEE Far East Forum on Nondestructive Evaluation/Testing
Subtitle of host publicationNew Technology and Application, Increasingly Perfect NDT/E
EditorsQinxue Pan, Chunguang Xu, Liu Yang
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages221-224
Number of pages4
ISBN (Electronic)9781479947317
DOIs
StatePublished - Oct 16 2014
Event2014 IEEE 11th Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application, FENDT 2014 - Chengdu, China
Duration: Jun 20 2014Jun 23 2014

Publication series

NameFENDT 2014 - Proceedings, 2014 IEEE Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application, Increasingly Perfect NDT/E

Other

Other2014 IEEE 11th Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application, FENDT 2014
CountryChina
CityChengdu
Period6/20/146/23/14

Fingerprint

Surface waves
Laser beams
Acoustic waves
Bandwidth
Lasers
Frequency modulation
Experiments

All Science Journal Classification (ASJC) codes

  • Safety, Risk, Reliability and Quality

Cite this

Seo, H., Choi, S., & Jhang, K. Y. (2014). Influence of laser beam profiles on the frequency bandwidth of laser-generated surface acoustic waves. In Q. Pan, C. Xu, & L. Yang (Eds.), FENDT 2014 - Proceedings, 2014 IEEE Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application, Increasingly Perfect NDT/E (pp. 221-224). [6928267] (FENDT 2014 - Proceedings, 2014 IEEE Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application, Increasingly Perfect NDT/E). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/FENDT.2014.6928267
Seo, Hogeon ; Choi, Sungho ; Jhang, Kyung Young. / Influence of laser beam profiles on the frequency bandwidth of laser-generated surface acoustic waves. FENDT 2014 - Proceedings, 2014 IEEE Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application, Increasingly Perfect NDT/E. editor / Qinxue Pan ; Chunguang Xu ; Liu Yang. Institute of Electrical and Electronics Engineers Inc., 2014. pp. 221-224 (FENDT 2014 - Proceedings, 2014 IEEE Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application, Increasingly Perfect NDT/E).
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abstract = "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.",
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Seo, H, Choi, S & Jhang, KY 2014, Influence of laser beam profiles on the frequency bandwidth of laser-generated surface acoustic waves. in Q Pan, C Xu & L Yang (eds), FENDT 2014 - Proceedings, 2014 IEEE Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application, Increasingly Perfect NDT/E., 6928267, FENDT 2014 - Proceedings, 2014 IEEE Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application, Increasingly Perfect NDT/E, Institute of Electrical and Electronics Engineers Inc., pp. 221-224, 2014 IEEE 11th Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application, FENDT 2014, Chengdu, China, 6/20/14. https://doi.org/10.1109/FENDT.2014.6928267

Influence of laser beam profiles on the frequency bandwidth of laser-generated surface acoustic waves. / Seo, Hogeon; Choi, Sungho; Jhang, Kyung Young.

FENDT 2014 - Proceedings, 2014 IEEE Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application, Increasingly Perfect NDT/E. ed. / Qinxue Pan; Chunguang Xu; Liu Yang. Institute of Electrical and Electronics Engineers Inc., 2014. p. 221-224 6928267 (FENDT 2014 - Proceedings, 2014 IEEE Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application, Increasingly Perfect NDT/E).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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N2 - 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.

AB - 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.

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Seo H, Choi S, Jhang KY. Influence of laser beam profiles on the frequency bandwidth of laser-generated surface acoustic waves. In Pan Q, Xu C, Yang L, editors, FENDT 2014 - Proceedings, 2014 IEEE Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application, Increasingly Perfect NDT/E. Institute of Electrical and Electronics Engineers Inc. 2014. p. 221-224. 6928267. (FENDT 2014 - Proceedings, 2014 IEEE Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application, Increasingly Perfect NDT/E). https://doi.org/10.1109/FENDT.2014.6928267