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Related Experiment Video

Updated: Jul 7, 2026

Three-dimensional Optical-resolution Photoacoustic Microscopy

Three-dimensional Optical-resolution Photoacoustic Microscopy

Published on: May 3, 2011

Microdefocusing method for measuring acoustic properties using acoustic microscope.

H Kanai¹, N Chubachi, T Sannomiya

¹Dept. of Electr. Eng., Tohoku Univ., Sendai.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|January 1, 1992

Summary

A new microdefocusing method improves acoustic microscopy for measuring material properties. This technique enhances resolution by analyzing V(z) curves near the focal plane, overcoming limitations of conventional V(z) analysis.

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Area of Science:

Materials Science
Acoustics
Ultrasonics

Background:

Acoustic microscopy is widely used to measure material acoustic properties.
Conventional V(z) curve analysis determines phase velocity and attenuation of leaky surface acoustic waves (LSAW).
Conventional methods require extensive V(z) curve measurements, limiting sample resolution.

Purpose of the Study:

To introduce a novel microdefocusing method for enhanced acoustic property measurement.
To overcome the resolution limitations of traditional V(z) curve analysis in acoustic microscopy.
To develop and validate a new approach for high-resolution acoustic property determination.

Main Methods:

The microdefocusing method analyzes V(z) values within a specific interference period near the focal plane.
A specialized butterfly ultrasonic transducer is proposed for this method.
A digital signal processing procedure is developed for analyzing transducer output.

Main Results:

The microdefocusing method allows for acoustic property determination with improved resolution.
Basic experiments confirm the feasibility and principles of the proposed method.
The technique offers a more efficient approach compared to conventional V(z) analysis.

Conclusions:

The microdefocusing method represents a significant advancement in acoustic microscopy.
This technique enables higher resolution measurements of material acoustic properties.
The study validates the effectiveness of the butterfly transducer and digital signal processing for this application.