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Determination of Laser Beam Intensity to Maximize Amplitude of Ultrasound Generated in Ablation Regime via Monitoring Plasma-induced Air-borne Sound

Title
Determination of Laser Beam Intensity to Maximize Amplitude of Ultrasound Generated in Ablation Regime via Monitoring Plasma-induced Air-borne Sound
Author
장경영
Keywords
Ablation; Laser ultrasound; Plasma shield; Plasma-induced air-borne sound; Sensitivity correction
Issue Date
2015-12
Publisher
KOREAN SOC PRECISION ENG
Citation
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING, v. 16, NO 13, Page. 2641-2645
Abstract
The laser ultrasonic technique in the ablation regime was studied for the effective excitation of ultrasound. First, the optimal laser beam intensity to maximize the amplitude of ultrasound was obtained. This is useful because the amplitude of ultrasound does not always increase as the laser beam intensity increases due to the plasma shielding effect. When the laser energy is fixed, for a steel specimen, the maximum ultrasonic amplitude is obtained at the laser beam intensity in the range of 10-20 GW/cm(2). In addition, an inline method to obtain the optimal laser beam intensity was proposed based on the phenomena that the amplitude of the air-borne sound induced by plasma is inversely proportional to the amplitude of the generated ultrasound. Experimental results verified the usefulness of the proposed method by showing that the amplitude of ultrasound reached its maximum when the plasma-induced airborne sound disappeared.
URI
https://link.springer.com/article/10.1007%2Fs12541-015-0338-0http://hdl.handle.net/20.500.11754/30137
ISSN
2234-7593; 2005-4602
DOI
10.1007/s12541-015-0338-0
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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