Abstract
In-vessel inspection of delamination defects in first wall (FW) is one of the major maintenance challenges for ITER and future fusion reactors. In this paper, a noncontact and flexible ultrasonic scanning system with combining an electromagnetic acoustic transducer (EMAT) and a robotic inspection manipulator is proposed and investigated for the delamination defects inspection in the FW. Instead of using pulse echo method in conventional ultrasonic method for delamination inspection, a new method based on measuring the ultrasonic resonance signal at the delamination area is applied here. The use of resonant ultrasonic signals and signal processing with power spectrum analysis can significantly enhance signal amplitude of the EMAT and its ability to resist electromagnetic interference from the servo motors of the robotic manipulator. Finally, ultrasonic C-scan images of the delamination defects in an Aluminum-Copper welding specimen are obtained to demonstrate the capability of this technique.
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