Plane array type electromagnetic sensor with trapezoidal structure

Abstract

The invention provides a plane array type electromagnetic sensor with a trapezoidal structure, comprising a flexible substrate, wherein a primary coil and an exciting electrode pair are arranged on one face of the flexible substrate; a secondary coil array and an output electrode pair are arranged on the other face of the flexible substrate; a trapezoidal periodic structure is formed by the primary coil and the secondary coil array; the secondary coil array is formed by more than four secondary detection coils; and each half period of the primary coil comprises four secondary detection coils which are the same in size and are symmetrically distributed. The plane array type electromagnetic sensor with the trapezoidal structure has the advantages of simple structure, convenience for manufacturing, stronger output signals, capability of effectively realizing detection of weak signals, sensitivity on the aspects of defects, stress and the like, high detection efficiency, and capability of measuring complete physical attributes of materials to be detected and the like.

Description

technical field [0001] The invention mainly relates to the technical field of non-destructive testing, in particular to a planar electromagnetic sensor based on the principle of electromagnetic eddy current. Background technique [0002] With the development of science and technology, the scope of application of non-destructive testing technology continues to expand. It is not only the basis of modern industrial technology, but also a key technology in aerospace, national defense and military fields. It is used in machinery, construction, metallurgy, electric power, petroleum, shipbuilding, automobile , aerospace, nuclear energy, railway and other industries are widely used. Among them, "eddy current non-destructive testing technology" is a non-destructive testing method based on the principle of electromagnetic induction. It has the advantages of fast sensor response, high sensitivity, non-contact, and no coupling medium. one of the effective methods. [0003] However, tr...

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Problems solved by technology

[0003] However, traditional electromagnetic sensors generally have the following problems: ①The consistency of the sensor is poor, the detection signal is easily affected by factors such as lift-off, and the quantitative detection effect is poor; ②There is a contradiction between detection efficiency and detection resolution, and it is difficult to achieve rapid detection; ③Only It can detect existing defects, but cannot monitor the stress distribution in the material and the development process of fatigue damage; ④ Poor adaptability to the detection object, and the false detection rate of complex structures is high

Although this type of planar electromagnetic sensor can effectively improve the common shortcomings of traditional electromagnetic sensors, it also has the following shortcomings: due to the use of a single-turn coil as the detection unit, and the unit size is small, the output signal is too weak, which is not conducive to the back-end signal processing

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