Spatial Resolution with Time-and-Polarization-Resolved Acoustic Microscopy

Published

January 1, 1997

Author(s)

D Xiang, Gerald V. Blessing, Nelson N. Hsu

Abstract

We have developed a time-and-polarization-resolved acoustic microscopy technique to determine material properties of solids immersed in water. At the heart of this technique is a specially designed large aperture, lensless, cylindrical PVDF transducer which encompasses most of the attributes of conventional line-focus-beam (LFB) acoustic microscopy, but over larger interrogated sample areas. We have tested two transducers operating at 10 MHz with the same cylindrical radius (25.4 mm), but different widths (0.5 mm vs.12 mm). By comparing the radiated field patterns obtained via planar scanning with a membrane hydrophone, we verified that the lateral spatial resolution had been improved with the smaller element width. Using this transducer on a unidirectional composite sample, we have obtained inner-defect images as well as fiber-orientation-dependent leaky Lamb wave measurements.

Citation

Proceedings of Review of Progress in Quantitative Nondestructive Evaluation

Volume

Vol 27

Pub Type

Journals

Keywords

Acoustic microscopy, NDE, Ultrasonics

Citation

Xiang, D. , Blessing, G. and Hsu, N. (1997), Spatial Resolution with Time-and-Polarization-Resolved Acoustic Microscopy, Proceedings of Review of Progress in Quantitative Nondestructive Evaluation (Accessed April 26, 2024)