ULTRASONIC METHOD AND ULTRASONIC APPARATUS FOR COMPUTING CONCENTRATION

摘要

PROBLEM TO BE SOLVED: To shorten a computing period and carry out a measurement more precisely in an ultrasonic method and an ultrasonic apparatus for computing a concentration.;SOLUTION: In the ultrasonic method for computing the concentration, an ultrasonic wave is transmitted into an solution to be measured, and the ultrasonic wave which propagates through the solution to be measured, is received, and a propagation velocity V is computed from a propagation time and a propagation distance, and a temperature T of the solution to be measured is detected, and (n-1) kinds of specific physical quantities (α₁-α_n-1) which are, independently of propagation velocities, affected respectively by solute concentrations and temperatures of the solution to be measured, and also which are, independently of each other, affected by the solute concentrations and the temperature of the solution to be measured, are defined, and a function representing relations of the propagation velocity V of the ultrasonic wave, respective solute concentrations (D₁-D_n) and the (n-1) kinds of specific physical quantities (α₁-α_n-1) is given as following: V=F₁₁(T, D₁, α₁-α_n-1) through V=F_1n(T, D_n, α₁-α_n-1), α₁=F₂₁(T, D₁, V, α₂-α_n-1) through α₁=F_2n(T, D_n, V, α₂-α_n-1), α₂=F₃₁(T, D₁, V, α₁, α₃-α_n-1) through α₂=F_3n(T, D_n, V, α₁, α₃-α_n-1) through α_n-1=F_n1(T, D₁, V, α₁-α_n-2) through α_n-1=F_nn(T, D_n, V, α₁-α_n-2), and the solute concentrations (D₁-D_n) are computed from the temperature T, the specific physical quantities (α₁-α_n-1) and the propagation velocity V, based on the function.;COPYRIGHT: (C)2006,JPO&NCIPI