Structural Coupled Electromagnetic Sensing of Defects Diagnostic System

Abstract

Magnetic flux leakage (MFL) detection methods are widely used to detect pipeline defects. However, it is limited by the detection orientation and magnetization. Besides, bulky excitation systems are incapable of adapting to the complex detection environments. This paper proposes a new Electromagnetic Structured Coupling sensing of merging Alternating Current Field Measurement (ACFM) and MFL within a multi-parameter system for different types of pipeline defects detection. In particular, a novel electromagnetic coupling sensor structure is proposed which enables simultaneous interaction between the excitation modes of Yoke and coil. Magnetic Yoke is integrated to magnetizing the axial pipeline to detect the circumferential surface and subsurface defects while the coil excites the circumferential uniform alternating current field and recognizes the axial defect. The novel structured sensing is highly sensitivity to the detection of both surface and subsurface defects. Simulation and experiments on defects in several samples have been conducted to validate the reliability and efficiency of the proposed system.

Working Stress Measurement of Prestressed Rebars Using the Magnetic Resonance Method

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Low-Temperature Rapid Polymerization of Intrinsic Conducting PAD/OC Hydrogels with a Self-Adhesive and Sensitive Sensor for Outdoor Damage Repair and Detection

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Flexible Mica-Based PZT Sensor for Real-Time Monitoring of the Airflow

“…Magnetic flux leakage detection is a popular non-destructive method, and when using this method, it is easy to obtain signals [9]. The theoretical basis of magnetic flux leakage is that the pipeline is magnetically saturated under the external magnetic field, and a magnetic leakage can be detected at the defective location; however, there are still limitations in terms of insensitivity to cracks that are parallel to the direction of magnetization [10]. Therefore, a new type of sensor that is non-destructive, easy to fabricate, highly sensitive, and highly durable is needed.…”