Mechanism Hybrid EMAT and Eddy Current Sensing Detection for Surface and Internal Defects NDT

Fast and efficient comprehensive inspection of oil and gas pipelines is a critical and challenging task. This paper proposes a novel mechanism hybrid non-destructive testing (NDT) method of Electromagnetic Acoustic Transducer (EMAT)and Pulsed Eddy Current Testing (PECT)for detecting surface and internal defects. This transceiver-integrated sensor simultaneously excites pulsed eddy current and ultrasonic waves and picks up composite signals. In particular, the ultrasound detects deep defects, and the eddy current detect surface defects. Numerical simulation and experiments have been carried out on the detection of hybrid defects. The feasibility, efficiency and reliability of the proposed method were verified.