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非线性波数域的高分辨扫频干涉层析成像

作者:谢胜利,蔡树银,白玉磊 阅读量:867

非线性波数域的高分辨扫频干涉层析成像

谢胜利,蔡树银,白玉磊
(广东工业大学,中国 广州 510006)

摘要:提出一种用于波数扫频干涉技术的超分辨层析重构方法,该方法适用于波数非线性采样情形。通过在非线性波数域中构造干涉频谱稀疏优化模型,在此基础上采用干涉频谱矩阵优化方法分离混叠层析干涉信号的相位场,解决因光源扫频带宽有限而导致的层析分辨能力不足问题。数值仿真计算出本文方法的层析分辨率为3.8 mm,在光源同等带宽前提下,比传统变换域方法提升了87%。双层结构材料轮廓重构实验验证了本文方法的有效性。  
关键词:波数非线性扫频;层析分辨率;相位测量  


High Resolution Swept-Source Optical Coherence Tomography in Nonlinear Wavenumber Sampling

XIE Shengli, CAI Shuyin, BAI Yulei
(Guangdong University of Technology, Guangzhou 510006, China)

Abstract: A method to show high resolution in swept-source optical coherence tomography is proposed. The method can handle the case of nonlinear wavenumber sampling. By constructing the sparse optimization model of interference spectrum in nonlinear wave number domain, the phase field of aliasing tomography interference signal is separated by interference spectrum matrix optimization method. Therefore, the problem of poor depth resolution owing to limited light source bandwidth can be addressed. Computer simulation numerically confirmed that the depth resolution of our method is refined to be 3.8 mm. The simulated result shows that the depth resolution is improved by 87%, compared to the traditional transform method. Furthermore, a profile measurement on double slice sample verified the effectiveness of the presented method.  
Keywords: wavenumber nonlinear scanning; depth resolution; phase measurement

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