基于点扩展函数和傅立叶光学理论,推导出系统的相干传递函数,并详细研究了光纤对轴向分辨率的影响.研究结果表明:该系统为相干成像系统,系统的轴向分辨率随光纤半径A的增加而降低.最后,搭建了一套内窥式共聚焦成像系统,并测得光栅样品的共聚焦图像.实验结果表明,该系统具有良好的分辨率.

The coherent transmission function of the system is deduced and the influence of fiber on axial resolution is investigated in detail on the basis of point spread function and Fourier optics. It is shown that the system acts as a coherent imaging system and the axial resolution of the system decays with increasing fiber radius A. An endoscopic confocal imaging system was built, and the in-focus image of glass grating was obtained which shows sufficient resolution.