Orthorhombic double-U-type intelligent visual detection array probe based on alternating current field measurement (ACFM)

Abstract

The invention discloses an orthorhombic double-U-type intelligent visual detection array probe based on alternating current field measurement (ACFM). A probe excitation part takes an orthorhombic double-U-type magnetic core as a frame and is wound with two groups of current-carrying coils to form an excitation array, thereby providing a necessary rotary uniform induction magnetic field for defect intelligent visual detection and eliminating the influence of a defect direction on detection sensitivity; each group of detection coils is formed by winding on the same I-type magnetic core frame in an orthorhombic way and is respectively used for detecting the magnetic flux density in the horizontal direction and the vertical direction, and a plurality of groups of detection coil sets are arranged in an array way to form a detection array. When the array probe moves on the surface of a workpiece at uniform speed, a similar uniform strong magnetic field which uniformly rotates is generated on the surface of a workpiece to be detected so that the probe has higher detection sensitivity on defects in any direction; in addition, the detection array extracts magnetic field disturbance information used for defect identification and visualization and marks a numerical value in a voltage form, thereby achieving the aim of detecting the position, the size and the shape of defects.

Description

technical field [0001] The invention relates to an intelligent visual detection device for metal surface defects based on AC electromagnetic field detection technology. More specifically, the invention relates to an orthogonal double U-shaped intelligent visual detection probe applied to AC electromagnetic field detection technology. Background technique [0002] AC electromagnetic field testing (ACFM) is a new non-destructive testing method, which is used in petrochemical, aerospace and other occasions to detect surface cracks of components, especially suitable for components such as offshore platforms and underwater structures. The principle is: the excitation part of the probe induces a uniform alternating current on the surface of the workpiece to be tested. When there is no defect in the workpiece or is far away from the defect, the induced magnetic field on the surface of the workpiece is uniform; if there is a defect, due to the difference in the resistivity of the air...

AI Technical Summary

Problems solved by technology

At present, ACFM detection probes are all excited by a single rectangular coil. The direction of the induced current in the workpiece is fixed due to the direction of the excitation coil. Only when the normal direction of the rectangular coil is parallel to the defect, that is, when the direction of the induced current and the direction of the defect are perpendicular to each other, The detection sensitivity is the highest, while the detection sensitivity to defects in other directions is low. When the current flow direction and the defect direction are parallel to each other, the detection sensitivity is the lowest

Therefore, the single-direction current-carrying coil can only generate a single-directional electromagnetic field on the surface of the workpiece to detect defect information in a single direction, but cannot describe the three-dimensional shape of the defect or detect defects in other directions

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