Author(s): T. Kanda; H. Miyamoto; S. Iwami
Linked Author(s): Hitoshi MIYAMOTO
Keywords: Measurement; Suspended solid; Image processing; Concentration; Luminance; Light attenuation; Multiple scattering
Abstract: A method for simultaneously measuring the spatial concentration distribution of suspended solid particles in water is proposed. Luminance in the visualized image is utilized for estimating the suspended solid concentration in water. We firstly derive an equation that relates the luminance to the concentration by applying the radiativetransfer equation that represents the properties of light transfer in a medium. The derived luminance-concentration equation consists of two terms representing the effect of light attenuation and that of multiple light scattering. Then, in order to determine the values of the coefficients in its equation and to formulate the multiple scattering term, experiments in which uniform concentration fields are visualized are carried out. The coefficients are successfully optimized by using the least squares method; the multiple scattering term is approximately represented by a linear function of concentration. Finally, the accuracy of the present method is examined through applying to measurement in quasi-uniform concentration fields. The result of measurement suggests that this method is useful for estimating the spatial distribution of the suspended solid concentration in water.
Year: 1999