关键词: 扫频光源/
波数校正/
互相关/
相位测量
English Abstract
Wavenumber calibration and phase measurement in swept source optical coherence tomography
Shangguan Zi-Wei,Shen Yi,
Li Peng,
Ding Zhi-Hua
1.State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Institute of Laser Biomedicaine, Hangzhou 310027, China
Fund Project:Project supported by the National Natural Science Foundation of China (Grant Nos. 61335003, 61275196, 61327007, 11404285, 61475143), the National High-Technology Research and Development Program of China (Grant No. 2015AA020515), Zhejiang Provincial Natural Science Foundation of China (Grant No. LY14F050007), Fundamental Research Funds for the Central Universities (Grant No. 2014QNA5017), Scientific Research Foundation for Returned Scholars, Ministry of Education of China.Received Date:24 July 2015
Accepted Date:23 October 2015
Published Online:05 February 2016
Abstract:Based on the phase information in time domain of a Mach-Zehnder interferometer (MZI), a method of calibrating the wavenumber of the source is proposed. Cross-correlation of wrapped phase in time-domain of the MZI is adopted to determine drifts among axial-lines. Owing to non-strictly periodic characteristics of wrapped phase in time-domain of the MZI, the determinable range of shift is unlimited. Synchronization of signals in time domain is then performed to correct their corresponding shifts. The obtained results demonstrate that it is feasible to realize phase measurement with high precision even under unstable swept source for the optical coherence tomography system.
Keywords: swept source/
wavenumber calibration/
cross-correlation/
phase measurement
