Nondestructive quantitative identification method and system for metal component defects based on microwave reflection

Abstract

The invention discloses a nondestructive quantitative identification method and system for metal component defects based on microwave reflection, applied to the field of nondestructive testing. The method comprises the following steps: aiming at a phase wrapping phenomenon in a process of acquiring reflection coefficient phase parameters by adopting a vector network analyzer in the prior art, performing phase unwrapping by an unweighted Gauss-Seidel method based on a least square method, restoring a blurred phase period, and acquiring a real phase value of an acquisition position in the scanning process, so that the reflection coefficient phase information is accurate; calculating the defect position boundary according to maximum and minimum of gradients by solving the gradients of unwrapping phase discrete points. Moreover, detection is performed by using set optimization lift-off and optimization frequency parameters in microwave detection signal excitation, and the detection effectis excellent.

Description

technical field [0001] The invention belongs to the field of nondestructive testing, in particular to a microwave nondestructive testing technology. Background technique [0002] Microwave non-destructive testing technology is a relatively new non-destructive testing technology that emerged in the 1960s. It mainly studies the interaction between high-frequency electromagnetic waves and electromagnetic parameters of the measured target. When the microwave is incident on the measured target, the physical properties of the microwave and the electromagnetic properties of the measured target will affect each other, so that the characteristic parameters of the microwave can be measured by the instrument. Changes to reflect the health status of the surface and near-surface of the measured target itself. Microwave nondestructive testing can detect different types of materials through different detection methods (reflection, transmission, etc.). At the same time, the detection meth...

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Problems solved by technology

[0005] However, microwave nondestructive testing at this stage simply infers the existence of defects in metal material specimens through changes in reflection coefficient amplitude and phase.

There is no accurate identification of the defect boundary on the metal surface, and the phase winding phenomenon will interfere with the identification of the defect boundary to a considerable extent when the vector network analyzer is used to collect the reflection coefficient phase parameters in the prior art

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