THz imaging technique for nondestructive analysis of debonding defects in ceramic matrix composites based on multiple echoes and feature fusion

作     者：Zhang, Ji-Yang Ren, Jiao-Jiao Li, Li-Juan Gu, Jian Zhang, Dan-Dan 

作者机构：Changchun Univ Sci & Technol Changchun 130000 Peoples R China Minist Educ Key Lab Optoelect Measurement & Opt Informat Tran Beijing Peoples R China 

出 版 物：《OPTICS EXPRESS》 (光学快报)

年 卷 期：2020年第28卷第14期

页      面：19901-19915页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：National Demonstration Center for Experimental Opto-Electronic Engineering Education Higher Education Discipline Innovation Project [D17017] 

主　　题：Analytical techniques Computed tomography Image processing algorithms Imaging techniques Terahertz imaging Three dimensional imaging 

摘      要：We propose a THz nondestructive analysis method based on multiple echoes and feature fusion. Conventionally, it is difficult to identify the debonding defects of the glue layer (II) due to the thin adhesive layer. To this end, a THz propagation model is established, and a quantitative method for determining the thickness of debonding defects based on multiple echoes is presented. The measurement error for preset defect thickness of 500 mu m was 4%. Further, for determining the area of debonding defects, a feature fusion imaging algorithm is proposed to realize the lateral recognition of defects and quantitative analysis is used to improve the recognition ability of defects. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement