Title :
P2F-8 Multipath Interference Between Plane and Corner Reflection for Ultrasonic Ranging Systems
Author :
Cheng, Ching-Hsiang ; Chong, Po-Fat ; Kwok, King-Lun ; Chan, Mau-Wah ; Fung, Tsz-Yan ; Chao, Chen ; Leung, Wallace
Author_Institution :
Hong Kong Polytech. Univ., Hong Kong
Abstract :
In this paper, we study the multipath interference between the plane and corner reflections for 40 kHz ultrasonic transducers with 55deg beam angle moving along or transverse to the transmitting/receiving directions. Discrete spots of low echo signal were found for either transducer moving directions. The interference pattern is similar to the diffraction pattern of a wave passing through an aperture that disrupts the wave. When a destructive or constructive interference happens, there is integer number of half wave length difference between the plane and corner reflection path distances.
Keywords :
acoustic wave interference; sonar; ultrasonic propagation; ultrasonic reflection; ultrasonic transducers; constructive interference; corner reflection; destructive interference; frequency 40 kHz; interference pattern; multipath interference; plane reflection; reflection path distance; transducer moving directions; ultrasonic beam angle; ultrasonic ranging systems; ultrasonic receiving direction; ultrasonic transducers; ultrasonic transmitting direction; Acoustic beams; Acoustic reflection; Acoustic transducers; Chaos; Diffraction; Echo interference; Geometry; Optical reflection; Ultrasonic imaging; Ultrasonic transducers;
Conference_Titel :
Ultrasonics Symposium, 2007. IEEE
Conference_Location :
New York, NY
Print_ISBN :
978-1-4244-1384-3
Electronic_ISBN :
1051-0117
DOI :
10.1109/ULTSYM.2007.411
