Non-contact imaging for delamination using diffuse field concept

Nakao Shogo; Hayashi Takahiro

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Non-contact imaging for delamination using diffuse field concept

机译：非接触式成像使用扩散场概念进行分层

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The non-contact measurement called scanning laser source (SLS) technique is applied to imaging inspection for subsurface delamination in a metal block and the effect of frequencies used for imaging is discussed with finite element method and experiments for an aluminum alloy block. First, FE formulation for the vibration of a closed structure described the relation between resonances in the whole structure and vibration distributions, and FE calculation provided the resonant frequencies and the resonant patterns of a metal block, which agreed well with experimental results. Next, images were obtained for a specimen with delamination using the SLS technique. When narrowband burst waves were used, the delamination images were largely different due to the resonances. For broadband chirp waves, the clear delamination images could be obtained in the frequency ranges including multiple resonant frequencies because diffuse fields were well established. (C) 2019 The Japan Society of Applied Physics

机译：将称为扫描激光源（SLS）的非接触式测量技术应用于金属块中地下分层的成像检查，并通过有限元方法讨论了成像频率对铝合金块的影响，并进行了实验。首先，封闭结构振动的有限元公式描述了整个结构的共振与振动分布之间的关系，而有限元计算提供了金属块的共振频率和共振模式，与实验结果非常吻合。接下来，使用SLS技术获得具有分层的样本的图像。当使用窄带突发波时，由于共振，分层图像有很大不同。对于宽带线性调频波，由于漫射场已建立，因此可以在包括多个共振频率的频率范围内获得清晰的分层图像。（C）2019日本应用物理学会

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《Japanese journal of applied physics》 |2019年第sg期|SGGB07.1-SGGB07.8|共8页
作者
Nakao Shogo; Hayashi Takahiro;
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Kyoto Univ, Grad Sch Engn, Dept Aeronaut & Astronaut, Kyoto 6158510, Japan;

Kyoto Univ, Grad Sch Engn, Dept Aeronaut & Astronaut, Kyoto 6158510, Japan;

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1. Non-contact imaging for delamination using diffuse field concept [J] . Nakao Shogo, Hayashi Takahiro Japanese journal of applied physics . 2019,第SG期

机译：使用漫反射现场概念的分层非接触成像
2. Imaging Subsurface Structure of an Urban Area Based on Diffuse-Field Theory Concept Using Seismic Ambient Noise [J] . Bora Nilutpal, Biswas Rajib, Malischewsky Peter Pure and Applied Geophysics . 2020,第10期

机译：基于散发环境噪声的漫射场理论概念的城市地区成像地下结构
3. Non-contact scanning diffuse correlation tomography system for three-dimensional blood flow imaging in a murine bone graft model [J] . Songfeng Han, Johannes Johansson, Miguel Mireles, Biomedical Optics Express . 2015,第7期

机译：用于鼠骨移植模型中三维血流成像的非接触式扫描扩散相关层析成像系统
4. A continuous wave non-contact diffuse optical tomographic measurement system and the corresponding image reconstruction algorithm for dense sampling data [C] . Huijuan Zhao, Qiang Hou, Xiaoqing Zhou, Optical tomography and spectroscopy of tissue X . 2013

机译：连续波非接触式漫射光学层析成像测量系统及用于密集采样数据的图像重建算法
5. Fast Radiative-Transfer-Equation-Based Image Reconstruction Algorithms for Non-Contact Diffuse Optical Tomography Systems. [D] . Jia, Jingfei. 2015

机译：非接触式扩散光学层析成像系统的基于快速辐射转移方程的图像重建算法。
6. Non-contact dynamic diffuse optical tomography imaging system for evaluating lower extremity vasculature [O] . J. W. Hoi, H. K. Kim, C. J. Fong, 2018

机译：用于评估下肢脉管系统的非接触式动态漫射光学层析成像系统
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Non-contact imaging for delamination using diffuse field concept

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