Location

La Jolla, CA

Start Date

1-1-1983 12:00 AM

Description

The use of lasers to generate thermoelastic waves has received considerable attention since the publication of the theoretical work of White.1 The author derives equations for the propagation of longitudinal elastic waves produced by surface heating of a semi-infinite medium with harmonic thermal (laser) excitation. The importance of the boundary conditions in determining the magnitude of the resulting elastic waves is described. Two conditions are imposed and the resulting amplitudes derived: (1) Laser absorption at x = 0 with elastic amplitude u=0 at x = 0 for all times t ≥ 0 (perfectly clamped or constrained surface) and (2) for the stress σ = 0 at x = 0 for t ≥ 0 (free surface). Propagation of the elastic wave is in the x direction.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

2B

Chapter

Section 25: Ultrasonic Transducers and Standards

Pages

1797-1806

DOI

10.1007/978-1-4613-3706-5_120

Language

en

File Format

application/pdf

Share

COinS
 
Jan 1st, 12:00 AM

Thermoelastic Structures for High Density Ultrasonic Energy

La Jolla, CA

The use of lasers to generate thermoelastic waves has received considerable attention since the publication of the theoretical work of White.1 The author derives equations for the propagation of longitudinal elastic waves produced by surface heating of a semi-infinite medium with harmonic thermal (laser) excitation. The importance of the boundary conditions in determining the magnitude of the resulting elastic waves is described. Two conditions are imposed and the resulting amplitudes derived: (1) Laser absorption at x = 0 with elastic amplitude u=0 at x = 0 for all times t ≥ 0 (perfectly clamped or constrained surface) and (2) for the stress σ = 0 at x = 0 for t ≥ 0 (free surface). Propagation of the elastic wave is in the x direction.