Method for magnetically detecting a variation in the cross-section of a metallic reinforcement element and associated device

Abstract

A magnetic detection device (4) for abnormal variation in the cross-section of a moving metallic reinforcement element is proposed. The device comprises: - magnetization means (5) configured to generate a periodic induction magnetic field so as to magnetize the metallic reinforcement element (1) along its entire length as it moves, - detection means (6) configured to detect a variation in the magnetic flux generated by the moving metallic reinforcement element (1) and to deliver a raw signal representative of the magnetic flux of the moving metallic reinforcement element (1), and - first comparison means (14) configured to compare a first detection signal to at least a first detection threshold, the first detection signal being determined from the raw signal, and to detect an abnormal variation in the cross-section of the metallic reinforcement element (1) based on the result of the first comparison.Figure for the summary: Fig 3.