Calibration of an electronic measuring system for ultrasonic analysis of solutions

The problem of calibrating a system for measuring the concentration of methanol in water is investigated. The inefficiency of polynomial and inverse-polynomial models used for this purpose is demonstrated. The cubic-spline interpolation is chosen and examined as a flexible means of calibration. A method for experimental validation of the results of calibration is proposed. The proposed method makes possible the utilization of a much greater amount of calibration data for improving the accuracy of calibration as compared with the polynomial and inverse-polynomial models, and requires much less a priori information on the relationships between quantities involved in the measurement process.<>