针对传统点扫描OCT 系统的成像速度对OCT 在实际研究和应用中的影响,本文提出并搭建了一种高速无扫描频域OCT 系统,对该系统的成像分辨率、探测深度与各种噪声进行分析,并提出一种新的消除背景噪声的方法。该系统根据频域OCT 和成像光谱仪的基本原理和工作特性,采用一种新的干涉光路以线聚焦方式对样品进行高速数据采集。实验结果表明,这种系统无需任何扫描装置就可得到二维层析图像,在对载玻片8 mm 宽度范围成像时,其速度比传统点扫描方式快两个数量级;利用文中提出的数据处理方法成功将背景噪声消除。

The slow imaging speed of traditional Optical Coherence Tomography (OCT) system limits the practical researches and applications of OCT , so a kind of fast OCT system without scanning frequency-domain was presented. The imaging resolution ratio, the depth of investigation and a variety of noise were analyzed, and a new method for eliminating background noise was brought forward. Based on the characters of the frequency-domain OCT and imaging spectrometers, the OCT system collected data rapidly with the line-focus mode and a new interferential optical path. Experimental results indicates that the two-dimensional tomographic image can be obtained without any scanning drive unit, the imaging speed for a glass slide which has 8mm width is two orders of magnitude quicker than the traditional point scanning mode and the background noise is eliminated successfully with the data processing algorithm.