THE CO2LASER - A NEW ULTRASOUND SOURCE
作者:
G. TAYLOR,
C. EDWARDS,
S.B. PALMER,
期刊:
Nondestructive Testing and Evaluation
(Taylor Available online 1990)
卷期:
Volume 5,
issue 2-3
页码: 135-143
ISSN:1058-9759
年代: 1990
DOI:10.1080/10589759008952960
出版商: Taylor & Francis Group
关键词: CO2laser;ultrasound generation;metals and plastics;lamb waves.
数据来源: Taylor
摘要:
The generation of ultrasound in metals and plastics by a pulsed TEA CO2laser is reported. In the case of metals a technique of laser induced air breakdown above the metal surface produces a rapidly expanding plasma which applies a normal force, with approximately Heaviside time dependence, to the surface resulting in the generation of an ultrasonic pulse. In plastics the ultrasound is generated by the absorption of C02 radiation producing a buried thermoelastic source close to the sample surface. In both cases the interaction leaves no surface damage
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