Design and investigation of a two-coil magnetic core inductor used for Eddy current pulsed thermography

Abstract

Eddy current pulse thermography (ECPT) is an active thermography technology in the nondestructive testing field. The inductor of ECPT is an important component that influences detection quality and efficiency. In this paper, a two-coil magnetic core inductor is proposed for ECPT, which characteristics are investigated by numerical simulation methods. This new structure enlarges the detectable area for ECPT and increases the view field for infrared cameras. Research results show that the uniformity of temperature distribution is improved significantly. At the same time, the geometric parameters and working parameters of the proposed inductor, including the coil turns, the coil height, the leg length of the magnetic core, the lift-off distance, the working frequency, are researched.