타겟면의 거칠기 및 경사각에 따른 초음파 반사 특성 실험

Abstract

This study deals with ultrasound reflection characteristics at a target surface during distance measurements using an ultrasonic sensor. The purpose of this study is to investigate the allowable range of the slope angle of a target surface where the incident ultrasound is reflected to return when the distance is measured by an ultrasonic sensor for both transmission and reception. To this end, it is necessary to research the reflection characteristics of ultrasound according to the roughness and slope angle of the target surface. We carried out experiments detecting ultrasonic waves reflected on a rough surface and returning to the sensor. The target specimens had particle sizes from 0 to 0.01 relative to the ultrasonic wavelength. As we changed the target surface slope, we monitored the reception of the reflected waves and investigated the distance measurement error. It appears that for the rougher surface, the allowable slope angle range was larger even though the detectable distance range is smaller. When the particle size relative to the ultrasonic wavelength was 0.008, the distance measurement was reasonable at a slope angle up to 25°.