ULTRASONIC DENSITOMETER AND MEASUREMENT OF CONCENTRATION

摘要

PURPOSE:To reduce a concn. measuring error generated accompanied by the temp. change of a transmitter and receiver due to the temp. change of a soln. to be measured in an ultrasonic densitometer. CONSTITUTION:The high frequency electric signal with constant frequency of alphaMHz generated from a high frequency oscillator 3 is modulated in frequency by a low frequency electric signal with constant frequency of betaHZ and the quartz oscillator of a transmitter 8 is excited by this modulation signal e0 to generate ultrasonic waves. The ultrasonic waves 12 propagating through the liquid to be measured of piping 13 are received by a receiver 9 and the output signal (e) of the receiver 9 is inputted to an operator 6. The operator 6 calculates the average value of the voltage values within the frequency range of alphaMHz+ or -betaHz of the modulation signal e0 and the average value of the output signals of the receiver 9 within said frequency range and compares both average values to calculate ultrasonic attenuation quantity, that is, the concn. of a suspended substance to display the same on an output meter 7.