Block diagram of the SAFT detection system.
Working principle of the transducer array.
Block diagram of the multiplexer.
Divergence angle and SAFT aperture.
Sketch plot of transducer array.
Original waveforms measured by four channels in the transducer array.
Comparison of signal spectrum (a) before and (b) after wavelet transform.
Compensation results after using the compensation filter.
Step of refined scan.
Concrete block in water tank and image result.
Concrete structure and image result.
Staircase block and SAFT imaging result.
Comparison of coarse scan and refined scan.
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