单光纤成像技术

Single Optical Fiber Imaging Technology

综述了单光纤成像技术的研究现状和动态。单光纤成像技术采用单根多模光纤进行成像,光纤既是成像器件又是传像器件,无需增加扫描器件和成像透镜便可将光纤一端视场范围内的场景一次性传输到另一端,因此又称为宽场光纤成像技术。该技术可减小成像光纤探头的直径,实现超细内窥成像。单光纤成像技术是一种计算成像方法,是在全息光学和傅里叶光学的基础上发展起来的,包括传输矩阵法和相位补偿法两种成像方法。对于多模光纤,如果可以预先得到频域(或空间域)的传输矩阵,则可以从光纤输出端光场中恢复目标图像,也可以预先测量光束通过光纤后的波前畸变。在成像系统中增加该波前畸变的共轭相位场,可以消除相应的波前畸变,从而在输出端获得不失真的目标图像。

The research status and dynamic of single fiber imaging technology are thoroughly discussed. A single multimode optical fiber is used in optical fiber imaging technology. The optical fiber is not only an imaging device, but also an image transmission device. Without scanning devices and imaging lenses, the scene within the fiber view scope can be transmitted from one end to the other end of fiber, so the single optical fiber imaging technology is also called wide-field fiber imaging technology. The technology can reduce the diameter of imaging fiber probe and realize ultrathin endoscopic imaging. The single optical fiber imaging technology burgeoning from holographic optics and Fourier optics is one kind of computation imaging methods, and it includes transmission matrix method and phase compensating method. For multimode fiber, if the transmission matrix in frequency domain or space domain can be obtained in advance, the object image can be recovered from the output light field of fiber, and the wavefront distortion of beam through the fiber can also be measured in advance. The introducing of conjugate phase field of wavefront distortion in the imaging system can eliminate the corresponding phase distortion, and the undistorted object image can be obtained at the output end.