Yuan Qun, Zhu Dan, Gao Zhishan
Appl Opt. 2015 Nov 10;54(32):9554-62. doi: 10.1364/AO.54.009554.
Free-space Fourier domain optical coherence tomography is adopted for biomedical imaging with ultrahigh resolution, in which the setup consists of an interferometer and a spectrometer. Two-dimensional lateral sampling in the sample arm of the interferometer is achieved by using a galvanometer-based scanner. Optical path difference (OPD) drift in the full scan field of view is observed in the assembly process of the scanner. A galvo mirror mount offset with respect to the rotation axis is demonstrated as the derivation of this OPD drift by both geometric analyses and model building. Then, an iterative assembly process of the scanner is proposed with the OPD drift taken as the alignment criteria.
自由空间傅里叶域光学相干断层扫描技术被用于超高分辨率生物医学成像，其装置由干涉仪和光谱仪组成。干涉仪样品臂中的二维横向采样通过基于振镜的扫描器实现。在扫描器的组装过程中，观察到了全扫描视野中的光程差（OPD）漂移。通过几何分析和模型构建表明，振镜安装座相对于旋转轴的偏移是这种OPD漂移的根源。然后，提出了一种以OPD漂移为对准标准的扫描器迭代组装过程。
