A numerical model of laser-generated ultrasound

Author

Sullivan, J.M., Jr. ; Ludwig, R. ; Stern, Sebastian

Author_Institution

Worcester Polytech. Inst., MA, USA

fYear

1988

fDate

2-5 Oct 1988

Firstpage

481

Abstract

A novel numerical model to study the laser-induced emission of acoustic waves in solids is discussed. In particular, this numerical model is applied to quantify the thermoelastic source problem. Temperature distributions and gradients are computed for the specific cases of surface flux vs. volume source assumptions of the laser beam. Finally, to extend the numerical formalism to elastic wave generation. coupling conditions for the temperature gradient and body force density in the elastic wave equation are discussed. The numerical model is placed in context with an overall theoretical strategy to the laser-induced emission of acoustic waves for NDT (nondestructive testing)

Keywords

acoustic emission; laser beam applications; photoacoustic effect; NDT; body force density; coupling; elastic wave generation; laser-generated ultrasound; nondestructive testing; numerical model; photoelastic effect; surface flux; temperature gradient; thermoelastic source; volume source; Acoustic waves; Distributed computing; Laser modes; Laser theory; Numerical models; Solid lasers; Surface acoustic waves; Temperature distribution; Thermoelasticity; Ultrasonic imaging;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1988. Proceedings., IEEE 1988

Conference_Location

Chicago, IL

Type

conf

DOI

10.1109/ULTSYM.1988.49423

Filename

49423