Optimization of Bending-Type Ultrasonic Transducers with Rotational Symmetry Using COMSOL Multiphysics®

M. Jungwirth[1] and M. Rabl[1]

[1]Wels School of Engineering, Upper Austria University of Applied Sciences, Wels, Austria

Ultrasonic sensors are commonly used for a wide variety of non-contact presence, proximity or distance measuring applications in industry, especially the automotive branch. This paper shows how the radiation properties of bending-type ultrasonic transducers with rotational symmetry depend on shape, dimensions and material parameters. In order to determine their dependencies, the behavior of such transducers with regard to their emitting characteristics in air was simulated using Finite Element (FE) methods for computing their surface elongation together with analytical elementary wave superposition. The results of the simulations have been validated by Laser Doppler Velocimetry (LDV) and angular dependent acoustic pressure measurements.

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