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An acoustic interferometer is an instrument, using interferometry, for measuring the physical characteristics of sound waves in a gas or liquid. It may be used to measure velocity, wavelength, absorption, or impedance. A vibrating crystal creates the ultrasonic waves that are radiated into the medium. The waves strike a reflector placed parallel to the crystal. The waves are then reflected back to the source and measured.
- Gucker, F. T.; Chernick, C. L.; Roy-Chowdhury, P (1966). "A Frequency-Modulated Ultrasonic Interferometer: Adiabatic Compressibility of Aqueous Solutions of Nacl and Kcl at 25°C". Proceedings of the National Academy of Sciences of the United States of America 55 (1): 12–19. doi:10.1073/pnas.55.1.12. PMC 285746. PMID 16578624.
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