Abstract
This study addresses the acoustic reception characteristics of a horn guide applied to an ultrasonic sensor for distance measurement. In order to design a horn guide to improve the acoustic directivity of ultrasonic sensors for both transmission and reception, identifying the reception performance as well as the transmission directivity of the ultrasound is necessary. The purpose of this study was to find the horn guide angle maximizing the ultrasonic reception performance by comparing it according to the angle of the cone-shaped horn guide. Acoustic finite element analysis was performed to identify the ultrasonic reception performance depending on the horn guide angle. For the horn guide with a cone shape, acoustic analysis was performed after modeling horns of various angles in the range from 0° to 40° of the wall angle of the horn. Horn guides made using a 3D printer were attached to an ultrasonic sensor to measure the received sound pressure. From the experimental results, the validity of the finite element analysis results was verified. Analysis and experiment consistently showed that the maximum reception was observed at horn angles in the range from 20° to 25°.
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