基于互相关运算的扫频光学相干层析成像延时校正算法

卢宇; 李中梁; 南楠; 步扬; 陈艳; 王瑄; 王向朝

doi:doi:10.3788/cjl201744.0607001

中国激光, 2017, 44 (6): 0607001, 网络出版: 2017-06-08

基于互相关运算的扫频光学相干层析成像延时校正算法下载： 554次

A Delay Correction Algorithm for Swept Source Optical Coherence Tomography Based on Cross Correlation Operation

论文大纲

卢宇 ^1,2,*李中梁 ^1,2南楠 ¹步扬 ^1,2陈艳 ^1,2王瑄 ^1,2王向朝 ^1,2

作者单位

¹ 中国科学院上海光学精密机械研究所信息光学与光电技术实验室, 上海 201800

² 中国科学院大学, 北京 100049

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摘要

提出了一种扫频光学相干层析成像k-clock延时校正算法, 该算法基于互相关运算, 能够有效校正光源自带k-clock信号的延时。由于扫频光源的不稳定性、同步触发硬件的精度不足以及外界环境影响, 扫频光源自带的k-clock信号在重采样干涉信号时很可能与干涉信号之间有一个不确定的延时, 导致系统分辨率下降。通过实验获得一个标准k-clock信号, 然后利用互相关运算计算出需要校正的k-clock信号的延时。由计算出的延时, 将k-clock信号进行左右移动从而对其进行校正, 再利用三次样条插值获得波数域等间隔的干涉信号。实验结果表明, 该算法平均运行时间为0.18 s, 能够将系统分辨率提高18.2%, 改善系统性能。

Abstract

A new algorithm of k-clock delay correction for swept source optical coherence tomography is proposed. The algorithm is based on cross correlation operation and can effectively correct the delay of the swept source k-clock signal. Due to the instability of the swept source and the external environment, as well as lack of precision of the synchronous trigger hardware, the k-clock signal of the swept source may have an uncertain delay with the interference signal when resampling the interference signal, resulting in decreased system resolution. A standard k-clock signal is acquired by experiments, and then the delay of the k-clock signal is calculated using the cross correlation operation. According to the calculated delay, the k-clock signal is shifted left or right to correct the difference with the standard k-clock, and then the corrected k-clock signal is used to resample the interference signal at evenly wavenumber domain interval. The experimental results show that the system performance is improved. The average running time of the algorithm is 0.18 s, and the resolution of the system is improved by 18.2%.

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卢宇, 李中梁, 南楠, 步扬, 陈艳, 王瑄, 王向朝. 基于互相关运算的扫频光学相干层析成像延时校正算法[J]. 中国激光, 2017, 44(6): 0607001. Lu Yu, Li Zhongliang, Nan Nan, Bu Yang, Chen Yan, Wang Xuan, Wang Xiangzhao. A Delay Correction Algorithm for Swept Source Optical Coherence Tomography Based on Cross Correlation Operation[J]. Chinese Journal of Lasers, 2017, 44(6): 0607001.

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