Realization of the ultrasonic liquid flowmeter based on the pulse-phase method

This paper describes the practical realization of an ultrasonic liquid flowmeter based on the pulse-phase method using modified tracking technique. The flowmeter is realized as an embedded system. Its functional structure is comprised of: microcomputer, input-output electronics for processing the ultrasonic signal, and blocks for timing and synchronization. Software support is given through a global flow diagram. The main metrological characteristics of the realized liquid flowmeter are determined by using available working standards. The experiments have shown that the total error of the full scale flowmeter described here is within the specified accuracy of 1%. This flowmeter can measure different kinds of liquids, and operates as an autonomous measurement equipment or as a part of a complex measuring system intended for automatic process control.