Modeling of Ultrasonic Measurement Systems with Waveguides

摘要

Ultrasonic measurements are very popular techniques used for material characterization and non-destructive testing applications. One of the most popular is a pulse echo technique [1]. In specific cases of non-destructive testing applications, such as investigation of properties of hot fluids, hot or melted metals, measurements must be performed at a high pressure and/or at high temperatures [2]. However conventional ultrasonic transducers can't withstand high temperatures. In this case special high temperature transducers must be used or in order to protect conventional ultrasonic transducers from influence of a high temperature and avoid depolarization, measurements must be performed using special waveguides with a low thermal conductivity between the object under investigation and an ultrasonic transducer. On the other hand, presence of the ultrasonic waveguide has a significant influence on the transmission of the ultrasonic wave from ultrasonic transducer to the object under investigation [3]. It is very important to select a proper configuration of the waveguide [4]. In order to save materials and manufacturing time resources numerical modeling must be used. Objective of this work was comparison of the two modeling techniques of the ultrasonic measuring systems with waveguides: 1D matrix technique and 2D finite element method.