TITLE

Modeling of the ablation source in laser-ultrasonics

AUTHOR(S)
Hoffmann, A.; Arnold, W.
PUB. DATE
May 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p279
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
For the excitation of ultrasound by optical irradiation two principal mechanisms play a role. One of them, the so-called thermoplastic effect has been quantitatively described by several groups. In this work, a quantitative model describing the second effect, the excitation of ultrasonic signals by evaporation of the surface of the material onto which the laser pulses impinges, is presented. The evaporation, the expansion of the evaporated material as well as the interaction with the optical radiation is treated in a one-dimensional model. The pressure exerted on the surface of the specimen which results from the expanding vaporized material is used as source for the generation of the ultrasonic signals in the material or component insonified. There is an optical intensity at which the broadband ultrasonic signals exhibit maximal amplitude. The amplitude of the ultrasonic signals calculated using the model presented and the amount of ablated material are compared with experimental results. Despite the simplifications made, the agreement between theory and experiment is excellent for steel and satisfactory for aluminum. The results of this work can be used to optimize the parameters for a laser-based ultrasonic inspection system. © 2000 American Institute of Physics.
ACCESSION #
6029121

 

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