基于经验小波系数模态分解的太赫兹成像纵向分辨增强研究
DOI:
作者:
作者单位:

1.首都师范大学;2.北京理工大学;3.深圳光启尖端技术有限责任公司

作者简介:

通讯作者:

中图分类号:

基金项目:

成像技术高精尖创新中心科技创新服务能力建设基金(008/19530012003);首都师范大学分类发展--学位点建设与研究生教育立项及研究生高水平学术创新-物理系-专业学位实践基地项目(008-2155089)


Study on longitudinal resolution enhancement of terahertz imaging based on empirical wavelet coefficient mode decomposition
Author:
Affiliation:

1.Capital Normal University;2.Beijing Institute of Technology;3.Shenzhen Kuang-Chi Advanced Technology Co., Ltd

Fund Project:

the Beijing Advanced Innovation Center for Imaging Theory and Technology Scientific Research Funds (008/19530012003); the Capital Normal University Development Funds by Category - Physics Department - Practice Base Projects for Degree Study Program (008-2155089)

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    为了提高太赫兹成像探测的纵向分辨率,提出了一种基于连续小波的经验模态分解的纵向分辨率增强新方法。首先先对样品的频域信号进行连续小波变换处理,获得其相对应的连续小波变换系数;然后对获得的连续小波系数进行经验模态分解,将其自适应地分解为一系列的本征模式函数和一个残差信号,并提取其中第一阶本征模式函数为成像参数进行三维重构,获得最终的三维本征模函数图像,以此来提高太赫兹检测图像的纵向分辨率。为验证方法的有效性,采用150 GHz~220 GHz高频太赫兹调频雷达成像系统分别对两种含内部脱胶缺陷的夹层结构复合材料进行成像检测并利用提出的方法进行处理,得到了纵向分辨率被有效增强,清晰度被有效提高的检测结果图像,这为未来的太赫兹计算机断层扫描成像和太赫兹无损检测应用研究提供了新的思路。

    Abstract:

    In order to improve the longitudinal resolution of terahertz imaging detection, a novel longitudinal resolution enhancement method based on empirical mode decomposition of continuous wavelet was proposed. Firstly, the frequency domain signal of the sample is processed by continuous wavelet transform to obtain the corresponding continuous wavelet transform coefficients. Then, the obtained continuous wavelet coefficients are decomposed by empirical mode decomposition, which is adaptively decomposed into a series of intrinsic mode functions and a residual signal. And the first-order intrinsic mode function is extracted as the imaging parameter for 3D reconstruction to obtain the final 3D intrinsic mode function image, so as to improve the longitudinal resolution of terahertz detection image. In order to verify the effectiveness of the method, the 150 GHz~220 GHz high frequency terahertz frequency modulated radar imaging system was used to detect two kinds of sandwich structure composite material with internal adhesive debonding defects, and the proposed method was used to process them. The detection result images with the longitudinal resolution effectively enhanced and the sharpness effectively improved were obtained, which provides a new idea for future terahertz computer tomography imaging and terahertz non-destructive testing research.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2021-11-10
  • 最后修改日期:2022-03-29
  • 录用日期:2022-04-14
  • 在线发布日期:
  • 出版日期: