Eddy current detecting device used for performing metal defect detection and eddy current probe thereof

Abstract

The invention discloses an eddy current detecting device used for performing metal defect detection and an eddy current probe thereof. The eddy current probe comprises more than one orthogonal combination probe, wherein each orthogonal combination probe comprises one exciting coil and two induction coils, the geometric centers of the two induction coils are overlapped, the central cross sections of the two induction coils pass by the geometric center of the exciting coil, and the central cross sections of the exciting coil and the two induction coils are pairwise vertical. If more than two orthogonal combination probes are arranged, the central cross sections of the exciting coils of all the orthogonal combination probes are located on the same plane, and the geometric centers of all exciting coils are located on the same straight line. The eddy current detecting device comprises a controller, a signal generating circuit, a wave filtering and amplifying circuit, a phase-sensitive wave detecting circuit, a signal collecting card, a host computer, a first high-speed analogue switch, a second high-speed analogue switch and the eddy current probe. According to the eddy current detecting device and the eddy current, the detection sensitivity is high and the detection speed is fast.

Description

Technical field [0001] The invention involves a metal material defect lossless detection sensor structure and corresponding detection circuit. Background technique [0002] The defect detection of metal materials is of great significance in the field of military industry? According to the principle of electromagnetic induction, coils with AC electricity will induces vortex flows in metal materials near its metal material. The induced eddy current will affect the original magnetic field distribution around the detection coil.As a result, the measurement impedance of the inductive coil is changed? The eddy current carries the thickness, defects, conductivity and other information of the metal material. By measured the changes in coil impedance caused by the vortex, the relevant physical parameters of the metal material can be inferred, such as whether there are defects. [0003] In conventional vortex detection, the inductive coil has an original inductive voltage signal output dur...

AI Technical Summary

Problems solved by technology

In eddy current testing, defects can only be effectively detected in a direction that can clearly cut off the path of induced eddy current flow, and a single probe is generally used for detection, which restricts the detection efficiency of the eddy current detection system to a certain extent

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