Implementation of the wavelet transform for V(z) analysis in acoustic microscopy

The scanning acoustic microscope is a powerful tool for the study of the physical and elastic properties of materials. Surface and interior structures of a specimen can be imaged nondestructively. The elastic micro analysis of bulk materials and layered structures is carried out by measuring the so-called V(z) function, which includes examination of the reflection function of solid materials, measurement of the phase velocity and attenuation of leaky surface acoustic waves and determination of the elastic constants of the material. Therefore, V(z) is a very important effect in acoustic microscopy for material characterization and so its precise analysis is desirable. A wavelet based filtering of the measured V(z) curve will be shown in order to remove short period oscillations caused by internal lens reverberations. Furthermore, the continuous wavelet transform of the V(z) data indicates irregularities in the experimental setup.© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.