Title :
A numerical model of laser-generated ultrasound
Author :
Sullivan, J.M., Jr. ; Ludwig, R. ; Stern, Sebastian
Author_Institution :
Worcester Polytech. Inst., MA, USA
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;
Conference_Titel :
Ultrasonics Symposium, 1988. Proceedings., IEEE 1988
Conference_Location :
Chicago, IL
DOI :
10.1109/ULTSYM.1988.49423
