低相干光断层扫描,是近十几年来发展起来集多种前沿科学和技术为一体的超高精度成像技术。介绍了该技术的理论原理及本实验室建立的基于时域线性调制和光纤迈克耳孙干涉仪的低相干光断层扫描系统并给出了初步的实验结果。重点对光源谱型和参考臂扫描速度不均匀性对系统输出信噪比的影响进行了理论模拟计算和实验研究。通过运用傅里叶频谱的分析方法，从工程设计的角度出发给出了基于实验结果的参量特性分析以及这些特性将会给实际光学相干层析系统测量结果带来的影响，从而获得了低相干光断层扫描系统改进的方法。

Optical coherence tomography (OCT) is a high resolution imaging technology developed in the recent years and based on many cutting-edge sciences and techniques. The principle is introduced, the OCT system based on time linear modulation and Michelson interferometer is given with its initial experimental results. The optical spectra of the light source and uneven scanning speed of reference delay line are emphasized by the simulation and experimental research. Using the FFT method, the analysis of parameter properties based on experimental results and their influence on practical coherence tomography is presented from the point of view of engineering designing, therefore the improved method is obtained.