流水中の浮遊物質の連続計測に用いる超音波減衰スペクトル法の二種類の線形理論

抄録

Ultrasonic attenuation spectroscopy is a technique for measuring the concentration and particle size distribution of a colloidal dispersion. The authors have performed continuous measurement of the concentration and particle size of suspended sediment in experimental flumes and the Rokkaku River in order to use this measurement technique in rivers. Up until now the authors have used the linear model of ultrasonic attenuation spectroscopy for their experiments, but in this paper we carried out experiments using particulate dispersion for 1-200 µm spheres with the McClements model for long wavelength regime and the Faran model for intermediate wave regime. The result indicated that it is possible to measure particles from sub-micron level to 1mm using ultrasonic waves in the 5.0 to 8.0MHz frequency band, and that calibration is required to measure the concentration of particles with irregular shapes.