Model of Piezoelectric Transducers for the Metrological Characteristics Study of Ultrasonic Measuring Instruments

The article describes the use of IT-technologies in the educational process and scientific laboratories by the example of studying primary measuring transducers, in particular, piezoelectric transducers. A mathematical model of the similar transducers, which are an integral part of an ultrasonic liquid flowmeter, is considered and refined. Equivalent electrical circuits are presented for both individual transducers and the entire flowmeter electro-acoustic path as a whole. The analysis of the dynamic characteristics of the flowmeter path is performed. Studies of the indicated transducers transfer functions in different modes have been carried out. The influence of the receiving- generating circuit parameters of ultrasonic flowmeters on the fluid flow rate measuring accuracy has been established and justified. The asymmetry reducing problem of the flowmeter electro-acoustic path when determining the propagation time measurement of probing signals, the difference of which is proportional to the fluid velocity and flow rate, is indicated. Modeling and experimental verification confirmed the obtained results of the flow measurement error.