| 摘要 |
PURPOSE:To accurately measure concentration of aqueous solution containing single constituent and to measure concentration of aqueous solution containing two or more constituents. CONSTITUTION:A sine wave signal generator 11 has a function for variably setting the frequency and the amplitude of an output signal, and supplies a generated sine wave signal to an ultrasonic oscillator 2 via an amplifier 12 with an amplitude factor regulating function. The oscillator 2 generates ultrasonic waves, and propagates it in aqueous solution to be measured. An ultrasonic receiver 3 receives the propagated ultrasonic waves, and inputs it to an amplifier 6 together with measured data by a thermocouple 5. The amplifier 6 filters an input signal, then amplifies it and supplies it to an A/D converter 7. The converter 7 converts an input signal to a digital signal, and supplies it to a constituent concentration calculator 13. The calculator 13 calculates by using linear sound velocity data obtained by the propagation of the ultrasonic wave and temperature information obtained by the thermocouple 5, and estimates concentrations of the constituents in the solution. |
