2. Principle of the scanning acoustic microscope
While we have detectors to record a luminous flux coming from an object, there are no acoustic receptors analogous to the eye or the photographic plate to fix the acoustic image on a support.
Various transcription devices were therefore sought, leading to the current system, which is partly inspired by the scanning electron microscope.
In its basic principle, the acoustic microscope comprises an ultrasound generator, consisting of a piezoelectric transducer, which converts an incident electrical signal into an acoustic signal. The frequencies f in acoustics correspond to wavelengths λ of the order of micrometers, given the speed v of ultrasound, which is of the order of several thousand meters per second (λ = v / f). It follows that the maximum spatial resolution achieved, due to diffraction limitation, is of the order...
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Principle of the scanning acoustic microscope
Imaging and acoustic signature
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