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研制了一种适用于内窥光学相干层析成像的单驱动非对称光纤悬臂扫描探头,可以利用单一驱动信号来激发非对称光纤悬臂的光纤末端沿李萨茹图形进行二维扫描。但是,正弦驱动信号激发的李萨茹轨迹在均匀性、覆盖率和图案帧频之间的权衡方面存在一定限制,不利于扫描成像的优化。基于非对称光纤悬臂固有的响应特性,提出了振幅调制正弦驱动信号来进行二维扫描轨迹图案的优化,并模拟研究了不同驱动信号下的扫描轨迹,对比评价了各种驱动信号下扫描图案的均匀性和覆盖率,同时进行了对比实验,验证了该方案的可行性。
A single-drive asymmetric fiber-optic cantilever scanning probe suitable for endoscopic optical coherence tomography was developed. The single-drive signal can be used to excite the fiber end of an asymmetric fiber cantilever along the Lissajous figure for two-dimensional scanning. However, there is a limitation in the trade-off between the uniformity, coverage and the frame rate of the Lissajous locus excited by the sinusoidal driving signal, which is not good for the optimization of the scanning imaging. Based on the inherent response characteristics of asymmetric optical fiber cantilever, an amplitude-modulated sinusoidal drive signal is proposed to optimize the two-dimensional scanning trajectory pattern. The scanning trajectories under different driving signals are simulated and the scanning pattern under various driving signals is evaluated Uniformity and coverage, at the same time a comparative experiment to verify the feasibility of the program.