应用光学, 2015, 36 (4): 543, 网络出版: 2015-08-25   

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
作者单位
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
摘要
以平衡检测原理为基础, 利用中心波长为700 nm的宽带低相干白光光源, 在自由空间中搭建了分辨率为0.93 μm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。
Abstract
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 0.93 μm 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.Shi Guohua,Ding Zhihua, Dai Yun, et al. Ophthalmic imaging by optical coherence tomography[J].Chinese Journal Of Lasers, 2008,35(9): 1429-1431.

罗曼婷, 游腾飞, 张秋坤, 钟剑锋, 钟舜聪. 基于平稳小波变换的时域光学相干层析系统[J]. 应用光学, 2015, 36(4): 543. Luo Manting, You Tengfei, Zhang Qiukun, Zhong Jianfeng, Zhong Shuncong. Time-domain optical coherence tomography system based on stationary wavelet transform[J]. Journal of Applied Optics, 2015, 36(4): 543.

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