Ultrasound attenuation spectroscopy is a method for characterizing properties of fluids and dispersed particles.
[1][2] Measurement of attenuation coefficient versus ultrasound frequency yields raw data for further calculation of various system properties.
Such raw data are often used in the calculation of the particle size distribution in heterogeneous systems such as emulsions and colloids.
Instruments that employ ultrasound attenuation spectroscopy are referred to as Acoustic spectrometers.
You can help Wikipedia by expanding it.This acoustics-related article is a stub.