无机械扫描谱域光学相干层析术研究

Research on Non-Mechanical Scan Spectral-Domain OCT Technique

为提高光学相干层析术(OCT)系统成像速度,借助成像光谱仪,以钨灯为非相干光源,采用柱面镜聚焦,搭建了迈克耳孙干涉仪结构的无扫描装置谱域OCT系统。介绍了系统结构和工作原理,对待测样品进行了层析成像实验,分析了系统的成像特性,利用中值滤波的方法消除背景噪声,获得了样品的二维层析图像,与点扫描光纤型OCT的成像速度进行了比较。研究表明,无扫描装置谱域OCT系统在8mm宽度范围成像时,其数据采集速度比传统点扫描方式约快2个数量级。

In order to overcome the disadvantage of slow mechanical scan of optical coherence tomography （OCT）, a non-mechanical scan frequency-domain OCT system with imaging spectrometer and Michelson interferometer was set up. The tungsten lamp was used as a non-coherent broadband light source. The focused line was obtained by using cylinder lens. The system structure and work principle were introduced respectively. The experiment to get optical tomography imaging of a sample was carried out. The imaging characteristic of the system was analyzed. The background noise is reduced by using the method of median filtering average. The result shows that the data collecting speed of the system is one hundred times as fast as that of time-domain tomography imaging in scope of 8mm, although the image quality is not as good as that of time-domain OCT due to the light source.