Abstract
Guided ultrasonic waves in wire waveguides are useful for various applications including position monitoring and in-situ measurements of specimens in harsh environments. In corrosive environments, it has been observed that the velocity of the guided waves changes due to the growth of an oxide layer on the waveguide. Previous work by Grossman [IEEE Trans. Sonics Ultrason. 31, 25–31 (1984)] analyzed this phenomenon by calculating the change in rod velocity due to oxide thickness. In this paper, the semi-analytical finite element (SAFE) method was used to determine how the velocity changes with respect to oxide thickness and frequency. In addition, the effects of protective coatings on the waveguide have been considered. Results demonstrate that the SAFE method is effective for determining the dispersion characteristics of a waveguide comprised of two distinct materials.
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