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

fYear

2007

fDate

28-31 Oct. 2007

Firstpage

1633

Lastpage

1636

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 2007. IEEE

Conference_Location

New York, NY

ISSN

1051-0117

Print_ISBN

978-1-4244-1384-3

Electronic_ISBN

1051-0117

Type

conf

DOI

10.1109/ULTSYM.2007.411

Filename

4409984