A metal material defect eddy current detection system and detection method based on force and magnetic fusion

Abstract

The invention discloses a metal material defect eddy current detection system of force-magnetism fusion, which is used for testing metal specimens, including: a signal generation subsystem, including a connected signal generator and a coil, and the signal generator provides an excitation voltage for the coil; Under the excitation of alternating voltage, the coil generates an alternating coil magnetic field B1, which generates an induced eddy current in the metal specimen, and the eddy current generates a corresponding secondary eddy current magnetic field B2, which acts on the coil to form a Lorentz force; the sensing subsystem includes a giant Magnetoresistive GMR sensor, spring and piezoelectric sensor, giant magnetoresistive GMR sensor is used to detect the superimposed field of B1 and B2 and convert it into the first output signal, the coil is connected with the piezoelectric sensor through the spring, and the Lorentz force is passed through the piezoelectric sensor converted into a second output signal; and an eddy current detection subsystem, including an envelope detection circuit, which obtains a signal envelope according to the first output signal and the second output signal, and detects defects of the metal test piece according to the signal envelope. The corresponding detection method and electronic equipment are also disclosed.

Description

technical field [0001] The invention belongs to the technical field of metal material defect detection, and in particular relates to a metal material defect eddy current detection system and detection method based on force-magnetic fusion. Background technique [0002] Metal materials play an important role in the industrial field, and materials such as aluminum sheets and tubes are widely used in industries such as aerospace, transportation, machinery and construction. Metal materials may have defects such as cracks and pores during production and processing, and may also be corroded due to environmental influences during service. Defects in metal materials can affect material properties and cause certain safety hazards. Therefore, it is necessary to detect defects in metallic materials. [0003] At present, the most commonly used method for detecting metal materials is the eddy current detection method. For example, CN201610649995.3 discloses one of its implementations. ...

AI Technical Summary

Problems solved by technology

However, in the conventional eddy current detection technology, only the magnetic field information generated by the eddy current is extracted, and the information is relatively simple.

In the disclosed metal material detection methods, there is also a technology that uses the interaction force between eddy current and magnetic field as the carrier of defect information transmission, such as CN201310576523.6, which uses the relative motion of metal material and permanent magnet to generate eddy current, and through the eddy current and The Lorentz force between the magnets represents defects. This technical solution generates a constant magnetic field through permanent magnets, and generates eddy currents and Lorentz forces through the movement of metal materials. The metal material to be tested is required to have a certain movement speed during detection, and it is impossible to complete the metal In-Situ Monitoring Tasks During Material Service

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