Triangular surrounding excitation type eddy current transducer and coil winding method thereof

Abstract

The invention provides a triangular surrounding excitation type eddy current transducer and a coil winding method thereof. The eddy current transducer comprises a printed circuit board and a coil assembly printed on the printed circuit board, wherein the coil assembly comprises an exciting coil wound into a triangular surrounding manner and further comprises three groups of detecting coils; the exciting coil comprises at least two circles of triangular annular elements wound by wires and composed of concentric similar triangles; the multiple circles of triangular annular elements are connectedin series; the three groups of detecting coils are respectively wound on three sides of triangles; the detecting coils are wound in a gap between two sides in the same direction of two adjacent circles of triangular annular elements. According to the triangular surrounding excitation type eddy current transducer and the coil winding method thereof disclosed by the invention, stress and strain ofvarious metal components in a plane stress state can be conveniently detected in a non-contact manner under the condition that only one transducer is used.

Description

Technical field [0001] The invention belongs to the technical field of nondestructive testing, and relates to a triangular surround excitation eddy current sensor for detecting three different directions of partial stress and linear strain in a metal structure under a plane stress state. Background technique [0002] Most mechanical structures are made of metal materials. Effective detection of the stress state of these metal structures is of great significance for understanding their service status and evaluating their remaining life. [0003] At present, the commonly used methods for detecting the state of stress in metal structures include strain gauge method, X-ray method, ultrasonic method and magnetic measurement method. Among these methods, the strain gage method requires contact measurement; the X-ray method is expensive and has radiation risks and is only suitable for laboratory testing; the ultrasonic method requires a couplant; and the magnetic measurement method is only...

AI Technical Summary

Problems solved by technology

[0005] The existing research on eddy current stress detection is limited to the detection of unidirectional stress and strain. There is a lack of eddy current sensors that can detect the direction of stress and strain, and there is a lack of eddy current sensors that can detect stress and strain in metal structures under the state of plane stress when the principal stress direction is unknown. Eddy current sensor

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