A time delay correction technique for SS-OCT

作     者：Wang, Yi Chen, Xiaodong Chen, Xiaojie Yu, Daoyin 

作者机构：Tianjin Univ Minist Educ Key Lab Optoelect Informat & Tech Sci Tianjin 300072 Peoples R China 

出 版 物：《JOURNAL OF X-RAY SCIENCE AND TECHNOLOGY》 (Ｘ线科学与技术杂志)

年 卷 期：2015年第23卷第6期

页      面：783-789页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0804[工学-仪器科学与技术] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：National Science Foundation Ministry of Education Foundation Tianjin Foundation 

主　　题：Optical coherence tomography (OCT) fourier optics and signal processing nonlinear optical signal processing resolution computation methods 

摘      要：BACKGROUND: K-trigger signals from light source or external Mach-Zehnder interferometer are commonly used in swept source optical coherence tomography (SS-OCT) to achieve interference signal sampling and resolution enhancement. But extra signal transmission time is required due to the increased complexity of interference system using k-trigger signals, resulting in a misalignment (a.k.a., time delay) between the k-trigger and the interference signals. OBJECTIVE: The objective of this paper is to propose a numerical technique to correct the time delay between these two signals. METHODS: The time delay is iterated in this technique and each iterated correction result is evaluated through calculating the full width at half maximum (FWHM) of peaks in time-domain. The precise alignment between the k-trigger and interference signals coincides with the minimum value of FWHM. RESULTS: The experimental results show that the FWHM can be improved by up to 50% using this time delay correction technique. CONCLUSIONS: The proposed technique assists to provide precise sample tomography, thus enhancing the way of understanding sample characteristic.