Abstract
Suspended sediment concentration is one of the basic data requirements in hydraulic engineering, environment, ocean, and other related fields. Based on the response relationship of ultrasonic waves to sediment particles, this study investigated the multi-frequency ultrasonic measurement and derived the theory formula. In the formula, the relationship between concentration and intensity existed only in theory, and there was no experimental data to verify it. The multi-frequency ultrasonic measurement experiment of suspended sediment was carried out by a self-developed ultrasonic measuring instrument, which verified the corresponding relation between concentration and scattering intensity is proportional to the power of half. In a single group of experiments, it was verified the concentration conversion can be carried out as the concentration bases are 0.1 and 0.3 kg/m3. In the multi-frequency concentration conversion of mixed particle size, and the error between theory and measurement was 6 %, proving that it has feasibility for sediment concentration measurement.
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