In ultrasonic nondestructive testing (NDT) of concrete structures, the synthetic aperture focusing technique (SAFT) can
improve the resolution of target and therefore gives a better image display of the B-scan data. In traditional B-scan of
concrete structures the ultrasonic transducers are usually moved manually to detect the whole structure, the detection
speed and the consistency in different test points are greatly affected. A PZT sensor array is designed in this paper to
perform B-scan on large concrete structures more efficiently. The excitation of the sensor array and the data processing
techniques for the array data are discussed. A signal processing approach is proposed to improve the consistency
between different test channels in the array. Experiments on real structures show the embedded objects can be located
accurately by using the array sensor and SAFT method.
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