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Wave interference
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==== Acoustic interferometry ==== An [[acoustic interferometer]] is an instrument for measuring the physical characteristics of sound waves in a [[gas]] or liquid, such [[velocity]], wavelength, [[absorption (acoustics)|absorption]], or [[Electrical impedance|impedance]]. A vibrating [[crystal]] creates ultrasonic waves that are radiated into the medium. The waves strike a reflector placed parallel to the crystal, reflected back to the source and measured.
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