An eddy current detection method and device using finger touch as an auxiliary means

Abstract

The invention discloses an eddy current detection method and device using finger touch as an auxiliary means. The coil that can be used to realize the eddy current detection is wound into a pancake shape or made on a flexible circuit board to form a small flexible sensor, and then Install the small sensor on the finger of the human body (that is, the operator). The finger is equivalent to the skeleton of the coil. Since the small sensor can be flexibly bent, the small sensor can be adapted to the surface of the metal structure with the soft movement of the finger surface. At the same time, using the sensitivity of human touch and the flexibility of fingers, it can easily move on the tested surface of metal structural parts, without being affected by various obstacles such as depressions and welding bumps, and can use the tactile sense of fingers to assist Positioning and judgment to improve the accuracy and adaptability of the detection results, this method is especially suitable for the detection of defects on the complex surface of metal structural parts.

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] Nondestructive testing NDT (nondestructive test) is a testing method that does not damage or affect its future performance or use on 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. It can determine the internal composition, structure, physical properties and state of materials or workpieces. 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 a method of placing an electrified coil close to the surface of a metal structural member, and an al...

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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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