TITLE

Design and application of a small size SAFT imaging system for concrete structure

AUTHOR(S)
Shao, Zhixue; Shi, Lihua; Shao, Zhe; Cai, Jian
PUB. DATE
July 2011
SOURCE
Review of Scientific Instruments;Jul2011, Vol. 82 Issue 7, p073708
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A method of ultrasonic imaging detection is presented for quick non-destructive testing (NDT) of concrete structures using synthesized aperture focusing technology (SAFT). A low cost ultrasonic sensor array consisting of 12 market available low frequency ultrasonic transducers is designed and manufactured. A channel compensation method is proposed to improve the consistency of different transducers. The controlling devices for array scan as well as the virtual instrument for SAFT imaging are designed. In the coarse scan mode with the scan step of 50 mm, the system can quickly give an image display of a cross section of 600 mm (L) × 300 mm (D) by one measurement. In the refined scan model, the system can reduce the scan step and give an image display of the same cross section by moving the sensor array several times. Experiments on staircase specimen, concrete slab with embedded target, and building floor with underground pipe line all verify the efficiency of the proposed method.
ACCESSION #
63502289

 

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