Title :
Correction technique of phase aberration in ultrasonic synthetic focusing signal
Author :
Hai-lin Yue ; Lin Luo ; Xiao-rong Gao
Author_Institution :
NDT Res. Center & Olympus NDT Joint Lab. of Nondestructive Testing, Southwest Jiaotong Univ., Chengdu, China
Abstract :
The materials of testing specimen are nonuniform, which leads to phase aberration in ultrasonic signal. The resolution of ultrasonic image decreases as a result of phase aberration, this paper proposes a method that can correct the phase aberration through calculating signal correlation. In this method, we calculate the correction function between the reference signal and other signals and choose the position of the maximum value to correct the phase aberration. The resolution improves through this method.
Keywords :
ultrasonic focusing; ultrasonic imaging; ultrasonic materials testing; SAFT imaging algorithm; nondestructive testing; phase aberration; signal correlation; synthetic aperture focusing technology; ultrasonic image; ultrasonic synthetic focusing signal; Acoustics; Arrays; Focusing; Image resolution; Signal to noise ratio; Ultrasonic imaging; phase aberration; phase correction; resolution; ultrasonic imaging;
Conference_Titel :
Nondestructive Evaluation/Testing (FENDT), 2014 IEEE Far East Forum on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4799-4731-7
DOI :
10.1109/FENDT.2014.6928236
