Abstract
Particle size estimation of suspended sediment is an ongoing area of research in acoustics. A single transducer was used to measure multifrequency backscatter from a suspended sediment-carrying jet. A composite waveform composed of three frequencies was transmitted by the transducer. The sediment was composed of natural sand and covered a range of narrow size distributions. Amplitude ratios among the three frequencies were evaluated in the experimental data. The same ratios were predicted using scattering theory. The measured ratios were used with these theoretical equations to solve for an estimate of the particle sizes. The method works well at estimating large (300–850 micron) particle sizes, but overestimates the size of small (150–300 micron) particles.
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