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Summary: NEAR FIELD ANALYSIS OF LASER-GENERATED
ULTRASOUND: THE EFFECTS OF THERMAL
DIFFUSION AND OPTICAL PENETRATION
Irene Arias1
, Todd W. Murray2
, and Jan D. Achenbach1
1
Center for Quality Engineering and Failure Prevention.
Northwestern University, Evanston, IL 60208
2
Department of Aerospace and Mechanical Engineering.
Boston University, Boston, MA 02215
Abstract. A first step towards the development of a model for the Scanning Laser Source
technique is presented, which entails an analytical formulation for the transient response
of an isotropic, homogeneous, linearly elastic half-space submitted to a pulsed laser line
source operating in the thermoelastic regime. The formulation takes into account optical
penetration into the material and thermal diffusion from the source, and is therefore a
suitable representation for the field near the source, where these effects become significant.
INTRODUCTION
Lasers have emerged as a powerful tool to generate and detect ultrasound. In
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