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Author Nihtila, T. ♦ Jylha, J. ♦ Visa, A.
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©2014
Language English
Subject Domain (in DDC) Technology ♦ Engineering & allied operations ♦ Applied physics
Subject Keyword Apertures ♦ Kernel ♦ Image reconstruction ♦ Transducers ♦ Imaging ♦ Geometry ♦ Acoustics ♦ image reconstruction ♦ acoustic imaging ♦ synthetic aperture ♦ acoustic sensors
Abstract This paper introduces a device and needed signal processing for high-resolution acoustic imaging in air. The device employs off the shelf audio hardware and linear frequency modulated (LFM) pulse waveform. The image formation is based on the principle of synthetic aperture. The proposed implementation uses inverse filtering method with a unique kernel function for each pixel and focuses a synthetic aperture with no approximations. The method is solid for both far-field and near-field and easily adaptable for different synthetic aperture formation geometries. The proposed imaging is demonstrated via an inverse synthetic aperture formation where the object rotation by a stepper motor provides the required change in aspect angle. Simulated and empirical results are presented. Measurements have been done using a conventional speaker and microphones in an ordinary room with near-field distance and strong static echoes present. The resulting high-resolution 2-D spatial distribution of the acoustic reflectivity provides valuable information for many applications such as object recognition.
Description Author affiliation: Dept. of Signal Process., Tampere Univ. of Technol., Tampere, Finland (Nihtila, T.; Jylha, J.; Visa, A.)
ISBN 9781479901623
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research ♦ Reading
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2014-11-02
Publisher Place Spain
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Size (in Bytes) 1.14 MB
Page Count 4
Starting Page 1714
Ending Page 1717


Source: IEEE Xplore Digital Library