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Related Experiment Video

Updated: Feb 16, 2026

Fabrication of Surface Acoustic Wave Devices on Lithium Niobate

Fabrication of Surface Acoustic Wave Devices on Lithium Niobate

Published on: June 18, 2020

A Lamb wave lens for acoustic microscopy.

A Atalar¹, H Koymen, F L Degertekin

¹Dept. of Electr. and Electron. Eng., Bilkent Univ., Ankara.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|January 1, 1992

Summary

A novel acoustic lens enhances imaging of layered solids by focusing on specific Lamb wave modes. This method offers superior sensitivity for material characterization and defect detection in layered structures.

Area of Science:

Materials Science
Acoustic Microscopy
Non-Destructive Testing

Background:

Conventional scanning acoustic microscopy (SAM) utilizes leaky modes for high image contrast.
Simultaneous excitation of multiple modes in SAM complicates image interpretation, particularly for layered media.
Existing methods lack the sensitivity to clearly distinguish between bonded and unbonded interfaces in layered structures.

Purpose of the Study:

To propose and describe a novel lens geometry for acoustic microscopes designed for imaging layered solid structures.
To demonstrate a method for selectively focusing acoustic waves into a single Lamb wave mode within layered solids.
To introduce characterization methods, V(Z) and V(f) curves, for enhanced material property analysis of layered structures.

Main Methods:

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Development of a specialized lens geometry for acoustic microscopes.
Utilizing the lens to excite and focus on specific Lamb wave modes in layered solids.
Characterization of layered structures using V(Z) (amplitude vs. defocus distance) and V(f) (amplitude vs. frequency) curves.

Main Results:

The proposed Lamb wave lens efficiently focuses acoustic waves into a single Lamb wave mode.
V(Z) curves generated with the new lens exhibit significantly higher sensitivity to material properties compared to conventional lenses.
The Lamb wave lens demonstrates at least an order of magnitude greater sensitivity than conventional lenses, enabling clear differentiation between good bonds and disbonds.

Conclusions:

The developed Lamb wave lens provides a more straightforward interpretation of acoustic images in layered media.
The associated V(Z) and V(f) characterization methods offer enhanced sensitivity for analyzing material properties and interfacial integrity.
This technique is highly effective for detecting defects such as disbonds in layered structures with superior precision.