基于平稳小波变换的时域光学相干层析系统  

Time-domain optical coherence tomography system based on stationary wavelet transform

作　　者：罗曼婷 游腾飞[1] 张秋坤[1] 钟剑锋[1] 钟舜聪[1,2] 

机构地区：[1]福州大学机械工程及自动化学院光学太赫兹及无损检测实验室,福建福州350108 [2]福建省医疗器械和生物技术重点实验室,福建福州350000

出　　处：《应用光学》2015年第4期543-549,共7页Journal of Applied Optics

基　　金：福建省杰出青年基金滚动项目(2014J07007);国家自然科学基金资助项目(51005077);教育部高校博士学科点科研基金(博导类;20133514110008);国家卫生和计划生育委员会科研基金(WKJ-FJ-27);福建省质量技术监督局科技项目(FJQI2013095;FJQI2012024);福建省高等学校学科带头人培养计划(闽教人〔2013〕71号);国家质检总局科技计划项目(2011QK216)

摘　　要：以平衡检测原理为基础,利用中心波长为700nm的宽带低相干白光光源,在自由空间中搭建了分辨率为0.93μm的基于平稳小波变换(SWT)的时域光学相干层析(TDOCT)系统,并将其应用于塑料薄片与透明胶纸多层薄膜结构的无损评价。针对现有算法重构效果不够理想的问题,通过对OCT成像过程中的图像增强手段的对比,提出利用SWT分解算法处理多层薄膜结构的光学相干层析二维图像。由薄膜检测的实验结果可知,从SWT细节系数中可以提取更显著的多层薄膜界面干涉信号,从而提高多层薄膜界面的增强效果。Based on the balanced detection and stationary wavelet transform(SWT)algorithm,a broadband low coherent white light source with center wavelength of 700 nm was employed to set up a time-domain optical coherence tomography(TDOCT)system in free space.The resolution of the developed OCT system was down to 0.93μm and it was applied to nondestructive evaluation of plastic sheets and transparent-tape multi-layered thin-film structures.The imaging enhancement methods in the process of OCT images were compared.To resolve the problem of unsatisfactory reconstruction results using current algorithms,the SWT decomposition algorithm was introduced to deal with the OCT images of the multi-layered structures.The experimental results show that this SWT-based method could extract more distinct interface interference signal from the SWT detail coefficients and therefore the interface imaging quality of multi-layered structures could be enhanced.

关 键 词：时域光学相干层析 平稳小波变换 平衡检测 薄膜检测 图像增强 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]