Eddy current detection method using finger touch as supplementary means and device thereof

Abstract

The invention discloses an eddy current detection method using finger touch as supplementary means and a device thereof. A coil capable of being used for realizing eddy current detection is wound in the shape of a pancake or arranged on a flexible circuit board to form a small sensor capable of flexibly bending, then the small sensor is mounted on a finger of a human body (namely an operator), and the finger is used as the framework of the coil. As the small sensor is capable of flexibly bending, the small sensor is adapted to the surface of a metal structural member along with the flexible motion of the surface of the finger. Synchronously, by adopting the sensitivity of human body contact and the flexibility of the finger, the small sensor can conveniently move on the detected surface of the metal structural member without being influenced by all obstacles such as pit, welding beading and the like. The finger touch can be used for supplementary location and judgment so as to improve the accuracy and adaptive capacity of detection result. The method is particularly suitable for defect detection on the complex surface of the metal structural member.

Description

Technical field [0001] The invention relates to an eddy current detection method, in particular to an eddy current detection method and device using finger touch as an auxiliary means. Background technique [0002] Non-destructive testing (NDT) is a testing method that does not damage or affect the future performance or use of materials or workpieces. By using NDT, defects in the interior and surface of materials or workpieces can be found, and the workpiece can be measured The geometric characteristics and dimensions of the material can be used to determine the internal composition, structure, physical properties and state of the material or workpiece. Non-destructive testing technology has been widely used in various industrial fields, such as manufacturing, aerospace, petrochemical and other fields. [0003] Eddy current testing is a non-destructive testing method based on the principle of electromagnetic induction. It is to close the energized coil to the surface of the metal...

AI Technical Summary

Problems solved by technology

[0004] Existing coils used for eddy current detection are usually fixed on a certain carrier to form a sensor. For example, winding the coil on a coil frame is one of them. The coil frame is actually equivalent to the skeleton of the coil. When performing eddy current detection, the coil can be moved along the detection surface only by moving the coil frame. Due to the skeleton structure of the coil frame, the sensor occupies a certain space in volume, so it is not convenient for the sensor to enter each For example, such a problem will occur when detecting a railway wheel axle. Power transmission or braking devices are usually installed on the railway wheel axle, so it is difficult for existing sensors to reach the required detection position. There is usually a convex edge around the end face of the wheel, and there is usually a protrusion in the middle of the end face, and there is an R-angle transition between the convex edge, the protrusion and the end face. Therefore, the detection of the R-angle transition position is not easy to operate. , especially due to the obstruction of other devices, the operator's line of sight will be blocked, it is difficult to accurately judge the moving position of the sensor, and it is easy to miss detection

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