직선부와 곡선부를 결합한 파동유도관에서 초음파 전파

Abstract

This study assesses the ultrasonic propagation in a waveguide structure combining straight and curved parts designed to shorten the minimum detectable distance of an ultrasonic sensor used for distance measurement. The straight guide part is necessary for the wave transmitted through a curved part to not deviate from the intended propagation direction; accordingly, its length should be selected suitably. Finite element analysis and experiment were conducted regarding the processes of transmission, reflection at a target, and reception of the wave in a waveguide having straight parts at each end of a curved part. Ultrasonic transmission and reception performances were compared for various length combinations of two straight parts while maintaining the total waveguide length. Implementing a longer straight part at the exit side yielded more advantageous reception of returning wave because of accurate propagation direction. We achieved a basis to design a combination of straight and curved parts to improve the performance of ultrasonic propagation.