Overview
ABSTRACT
Acoustic microscopy includes several acoustic-imaging modalities, which pursue the same goal: to provide comparable resolution to optical microscopy while allowing inspection in the vicinity of the surface or to a depth depending from the attenuation of ultrasound. Physical principles and several focusing systems are outlined. Illustrated practical applications belong to non-destructive testing and local ultrasonic characterization of materials.
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Thomas MONNIER: Senior lecturer at the University of Lyon - Acoustics and Vibration Laboratory of the Lyon National Institute of Applied Sciences (INSA de Lyon)
INTRODUCTION
The result of a synthesis of several physics and engineering disciplines, the acoustic microscope is now more than thirty years old. In the field of non-destructive testing, it has proved its worth for the internal inspection of opaque materials, integrated into increasingly complex structures. Many instruments of this type operate routinely on industrial sites, particularly for quality control in the production of electronic circuits.
At the same time, university laboratories continue to improve performance and broaden the scope of applications. Research into characterization by acoustic microscopy has been steadily progressing, driven primarily by materials science and quantitative imaging in medicine.
A huge number of products and industrial processes use one or more thin films deposited on a substrate. Characterizing these coatings - their thickness, adhesion, viscoelastic properties and evolution - is a major challenge.
Finally, the progress of near-field techniques has not spared acoustics, which paradoxically was one of them to begin with (airborne acoustics, musical acoustics). In this respect, the rise of microtechnology has greatly helped to develop new instrument concepts, enabling an acoustic approach that is different from, but complementary to, conventional microscopy techniques.
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KEYWORDS
materials | resolution | microscopy | attenuation of ultrasound | non-destructive testing | Local ultrasonic characterization
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Mechanical and dimensional measurements
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Acoustic microscopy
Bibliography
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Organizations – Associations – Federations
University of Montpellier II. Laboratoire d'Analyse des Interfaces et de nanophysique.
Institut supérieur de l'électronique et du numérique (ISEN) – Université Lille I – Sciences et technologies – Université de Valenciennes et du Hainaut-Cambresis
Parametric Imaging Laboratory. Université Pierre et Marie Curie – Paris 6...
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