| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for analyzing a suspended substance, calculating a concentration for each particle diameter in a liquid as a sample and a sum of the concentrations of each of the particle diameters (concentration) from a value of a measured ultrasonic attenuation rate without the usage of the optically measured turbidity. SOLUTION: The ultrasonic attenuation rate α(f<SB>j</SB>) is calculated from a water temperature and measured data of a frequency spectrum (a plural sets of the frequencies and the measured values of the spectrums), a concentration c<SB>i</SB>for each particle diameter is calculated from a partial regression coefficient β<SB>ij</SB>and the ultrasonic attenuation rate α(f<SB>j</SB>), a concentration C of the sample liquid is calculated from the concentration c<SB>i</SB>for each particle diameter, a unit concentration attenuation rate λ(f<SB>j</SB>) is calculated from the concentration C and the ultrasonic attenuation rate α(f<SB>j</SB>), and a relative particle amount is calculated from the partial regression coefficient β<SB>ij</SB>and the unit concentration attenuation rate λ(f<SB>j</SB>). Even in the liquid with very low clarity, the sum of the concentration for each of the particle diameter (concentration), the relative particle amount, and capacity (volume) concentration, in consideration of the peculiar attenuation rate based on a particle size and the particle diameter of the suspended substance, are measured. COPYRIGHT: (C)2011,JPO&INPIT |
