NDLI: Phase Aberration Correction of Ultrasonic Phased Array Signals

Content Provider	IEEE Xplore Digital Library
Author	Zhao, Xia Wang, Zhaoba Liu, Bin
Copyright Year	2008
Abstract	By properly adjusting the time delays, phased arrays can dynamically phase-steer and focus the ultrasonic beams. But phase aberration due to perturbation of system and materials degrade ultrasound performance by disrupting the ultrasound beam focus. Such phase aberration exists both in phased array transmission and reception focusing procedure. Currently, phase correction methods are implemented by adjusting the electronic phase delays used to steer and focus the ultrasound beam. In this article, time reversal method, take advantage of the invariance of the wave equation in a lossless medium under a time reversal operation, is proposed to correct the phase aberration. It is suggested to be implemented in reception focusing process instead of transmission focusing process. The correction experiments are applied to the signals obtained from defect in a specimen in ultrasonic phased array non-destructive testing. Correction results show that time reversal method has good phase correction capacity and super performance in terms of high resolution, contrast and signal-to-noise ratio.
Starting Page	63
Ending Page	66
File Size	436456
Page Count	4
File Format	PDF
ISBN	9780769531199
DOI	10.1109/CISP.2008.632
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-05-27
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Acoustic transducers phased array Delay effects aberration phase correction Phased arrays Ultrasonic transducers Ultrasonic imaging Focusing Transmission line measurements Acoustic arrays Acoustic beams Mirrors
Content Type	Text
Resource Type	Article

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