Optimization of Hydrophone Centering in Circular Ultrasonic Transducer during Field Characterization Using Edge Waves: A Feasibility Study

Abstract

In this article, we present a feasibility study using transducer edge waves to center a hydrophone during field characterization. A mathematical analysis is presented to study amplitude changes in edge waves; this analysis is based on the impulse response method and considers the transducer as a piston embedded in a rigid planar baffle. The experimental setup used to measure the edge waves is also presented. It has been observed, mathematically and experimentally, that edge wave amplitude reaches its maximum when the hydrophone is centered and that these amplitude changes are very sensitive to position, approximately 70% of its maximal amplitude; however, amplitude changes in front planar waves are less evident (10%). Agreement between experimental and calculated results demonstrates that changes in edge wave amplitude can be used to center the hydrophone in an objective way.

Therapy ultrasound equipment characterization: Comparison of three techniques

“…The sequence is composed by sweeps in each axis of the transducer transversal section to find the maximum acoustic pressure level which corresponds to the center of the piezoelectric plate. This procedure is repeated at different distances from the transducer until this one is completely centered [2]. A system for 3D positioning is used during the development of this technique (Fig.…”