Aero-engine blade test piece nondestructive testing method based on terahertz technology

Abstract

The invention discloses an aero-engine blade test piece nondestructive testing method based on a terahertz technology, which comprises the following steps: performing nondestructive testing on a sample by utilizing a terahertz signal to obtain a terahertz original detection signal; carrying out fourier transform, frequency domain deconvolution and wavelet processing on the terahertz original detection signal to obtain a characteristic signal with a high signal-to-noise ratio; performing Fourier transform on the characteristic signal with the high signal-to-noise ratio to obtain a frequency domain power spectrum, and expanding the frequency domain power spectrum to obtain a sample image; and carrying out quantitative characterization on the thickness and defects of the ceramic layer in thesample image after the imaging contrast is improved. The invention further provides an aero-engine blade test piece nondestructive testing device based on the terahertz technology. According to the method, the problems of low detection precision, limited detection range and missed detection and false detection of a traditional nondestructive detection mode can be solved, and high-precision quantitative detection of the surface, interface and internal crack defects of the thermal barrier coating and the thickness of the ceramic layer is realized.

Description

technical field [0001] The present disclosure relates to a non-destructive testing method for an aero-engine blade, in particular to a non-destructive testing method for an aero-engine blade test piece based on terahertz technology. Background technique [0002] Aeroengine is a highly complex and precise thermodynamic mechanism, which directly affects the performance, reliability and economy of aircraft. As the most important source of power for military equipment, aero-engines often operate under high temperature and high pressure, and the service environment is complex and harsh. In order to improve the high-temperature and anti-oxidation capabilities of aero-engines, thermal barrier coating materials are applied to aero-engines and other flight equipment . Thermal barrier coatings generally have a three-layer structure, from top to bottom are the ceramic layer for thermal insulation, the bonding layer for transitional bonding and oxidation resistance, and the substrate f...

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Problems solved by technology

[0006] Aiming at the problems in the prior art of low detection accuracy and low imaging resolution for ceramic layer thickness and internal defects of thermal barrier coatings, the purpose of this disclosure is to provide a non-destructive detection of aero-engine blade specimens based on terahertz technology method, combined with wavelet transform and other signal processing and image processing methods, to achieve high-precision detection of the thickness of the thermal barrier coating ceramic layer and internal micro-defects

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