Common source double-frequency excitation type multifunctional micro-magnetic signal synchronous detection method

Abstract

A common source double-frequency excitation type multifunctional micro-magnetic signal synchronous detection method is disclosed and belongs to the technical field of micro-magnetic nondestructive testing. Via use of the common source double-frequency excitation type multifunctional micro-magnetic signal synchronous detection method, five types of typical micro-magnetic detection parameters can be obtained synchronously, and detecting efficiency can be greatly improved. A standard micro-magnetic probe comprises an excitation magnetic circuit consisting of a magnetic core and an excitation wire coil, an induction wire coil wounded around the magnetic core, a Hall element used for detecting surface tangential magnetic field change of a ferromagnetic component being detected, and a Barkhausen noise detection wire coil. Sine wave superposed signals having a low frequency less than 100 Hz and a high frequency greater than 1k Hz that matche with an amplitude ration are used as excitation signals, and the excitation signals are sent into the excitation wire coil of the standard micro-magnetic probe so as to magnetize the ferromagnetic component being detected. The induction wire coil, the Hall element and the Barkhausen noise detection wire coil are respectively used for synchronously picking characteristic signals such as magnetic induction intensity time-varying signals, tangential magnetic field detection signals and Barkhausen noise detection signals; magnetic hysteresis loops, tangential magnetic field intensity time-varying signals, Barkhausen noise, eddy current impedance and incremental magnetic permeability can be quickly detected.

Description

technical field [0001] The invention relates to a method for synchronously detecting multifunctional micro-magnetic signals of a common-source dual-frequency excitation type, and belongs to the technical field of micro-magnetic nondestructive testing. Background technique [0002] The optimal selection of excitation signal is one of the key technologies for micromagnetic measurement of mechanical properties of materials and structural components. [0003] In the published or public research results, for different micro-magnetic signals (Barkhausen noise, hysteresis loop, tangential magnetic field strength, eddy current, etc.), different excitation signals are often used for step-by-step excitation, which not only consumes The time is long and the magnetization state of the material is not completely consistent during the step-by-step test, and the "source" (material state) reflected by various signals is different. Therefore, the optimal selection of the excitation signal i...

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Problems solved by technology

[0003] In the published or public research results, for different micro-magnetic signals (Barkhausen noise, hysteresis loop, tangential magnetic field strength, eddy current, etc.), different excitation signals are often used for step-by-step excitation, which not only consumes The time is long and the magnetization state of the material is not completely consistent during the step-by-step test, and the "source" (material state) reflected by various signals is different

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