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Acoustic microscopy : ウィキペディア英語版
Acoustic microscopy

Acoustic microscopy is microscopy that employs very high or ultra high frequency ultrasound. Acoustic microscopes operate non-destructively and penetrate most solid materials to make visible images of internal features, including defects such as cracks, delaminations and voids.
==Types of acoustic microscopes==
In the half-century since the first experiments directly leading to the development of acoustic microscopes, at least three basic types of acoustic microscope have been developed. These are the scanning acoustic microscope (SAM), Confocal scanning acoustic microscope (CSAM), and C-mode scanning acoustic microscope (C-SAM).〔Kessler, L.W., "Acoustic Microscopy", Metals Handbook, Vol. 17 – Nondestructive Evaluation and Quality Control, ASM International, 1989, pp. 465–482.〕 For details of development see the History section below.
More recently acoustic microscopes based around picosecond ultrasonics systems have demonstrated acoustic imaging in cells using sub-optical wavelengths working with ultrasonic frequencies into the multi-GHz. Since the vast majority of acoustic microscopes in use today are C-SAM type instruments, this discussion will be limited to these instruments.

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