A Simple Multisensor PECT System for Omnidirectional and Small Crack Detection on Medium-Carbon Steel Surfaces

Pulsed eddy current testing (PECT) is a vital non-destructive testing technique for detecting surface and subsurface defects in conductive materials. However, conventional single-sensor probes exhibit limited sensitivity to cracks oriented parallel to the eddy current flow, resulting in directional blind spots. This paper proposes a multi-sensor PECT probe for omnidirectional crack detection in C45 medium-carbon steel, integrating five HW-105A Hall sensors—one central (Hall1) and four peripheral