Experimental Damage Identification in Concrete Structure Using Stack Migration Imaging Technology

Stack migration imaging technology (SMIT), an advanced data processing technique typically used in geophysical exploration, was employed for the detection of small cracks inside concrete structures. Ultrasonic transducers were utilized as both actuator and sensor to generate and receive stress waves in the concrete. The wave field reflected from the damage was synthesized at a common reflective point to highlight the effective signals by using multiple transducers. Two concrete specimens with embedded damage were examined using horizontal stacking technology and diffracting scan pre-stack migration technology, respectively. The dimensions and locations of the damage were successfully imaged. Compared with traditional ultrasonic detection, The experimental results show that SMIT offers better damage visualization and allows damage detection from one side of the specimen.