Nondestructive characterization of materials with variable properties

Abstract

Summary. Materials with continuous variable properties in time and space are considered. The possibiiity of nondestructive characterization of these materials on the basis of nonlinear longitudinal wave propagation data is discussed on the basis of recent results. The model direct and inverse problems are solved. The utilization of obtained results enables one to solve several nondestructive material characterization problems.

Novel intrumentation calculation methods to determine the phase-shift of ultrasound waves for non-destructive material characterization

“…If the ultrasound signal speed is well-known, as is the case mainly for air medium, the phase of the reflected signal gives the distance covered by the signal, and thus the distance of the reflecting target. In other media in which the distance travelled by the signal can be measured by another method, the phase of the reflected signal allows the determination of the ultrasound wave propagation velocity in the medium [7][8][9][10].…”