多面转镜激光器扫频光学相干层析成像系统的全光谱重采样方法

发布时间：2018-03-13 02:38

本文选题：多面转镜扫频激光器　切入点：扫频范围　出处：《物理学报》2017年11期 　论文类型：期刊论文

【摘要】：在多面转镜激光器扫频光学相干层析成像系统中,激光器存在着输出光谱错位与扫频范围波动的问题.目前的重采样方法中,普遍利用互相关运算校正光谱错位,并进行大范围的截取,保证扫频范围的一致性,但这会导致成像信噪比与分辨率的降低.本文用马赫-曾德尔干涉仪(MZI)采集到的干涉信号对扫频范围波动的问题进行了详细的测量与分析,其中干涉信号的解缠相位曲线的非随机性和平行性,表明该类激光器输出光谱的波长分布具备一致性.在此基础上,提出了一种用最长扫频范围的MZI干涉信号,对样品干涉信号进行时域光谱对齐、然后进行一对多插值的重采样方法.实验与分析表明,该方法利用了所有的光谱信号,保证了样品干涉信号的能量利用率,能有效提高图像的信噪比与分辨率.
[Abstract]:In the optical coherence tomography system of multi-plane rotating mirror laser, the laser has the problems of output spectrum dislocation and frequency sweep range fluctuation. In the resampling methods, the cross-correlation operation is widely used to correct the spectral dislocation. And a wide range of interception to ensure the consistency of the sweep range, However, this will lead to the reduction of imaging SNR and resolution. In this paper, the interference signal collected by Mach Zehnder Interferometer (MZI) is used to measure and analyze the frequency range fluctuation in detail. The non-randomness and parallelism of the unwrapping phase curve of the interference signal show that the wavelength distribution of the output spectrum of this kind of laser is consistent. On the basis of this, a MZI interference signal with the longest sweep frequency range is proposed. The time domain spectral alignment of the sample interference signal is carried out, and then a one to many interpolation resampling method is carried out. The experiment and analysis show that the method makes use of all the spectral signals and ensures the energy utilization ratio of the sample interference signal. It can effectively improve the SNR and resolution of the image.
【作者单位】：中国科学院苏州生物医学工程技术研究所江苏省医用光学重点实验室;
【基金】：科技部重大科学仪器设备开发专项(批准号:2016YFF0102000) 中国科学院先导专项(批准号:XDB02060000);中国科学院前沿科学重点研究项目(批准号:QYZDB-SSW-JSC03);中国科学院青年创新促进会资助的课题江苏省杰出青年基金(批准号:BK20060010) 国家自然科学基金(批准号:61675226,61378090)~~
【分类号】：TN248

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