非对称光纤悬臂探头的驱动优化研究

Optimization on Scanning Pattern Realized by Asymmetry Fiber Cantilever Driven by Single Piezo Bender Actuator

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 probe capable of two dimensional scanning for endoscopic optical coherence tomography based on the asymmetry fiber cantilever driven by single piezo bender actuator is developed.However,Lissajous pattern realized by driving signal of sine form is hard to balance between uniformity,coverage and frame frequency,which hinders the optimization of scanning pattern.Based on response characteristic of the asymmetry fiber cantilever,the paper presents an amplitude modulated sine function as the driving signal for optimization of the scanning pattern.Simulations on scanning patterns under the same frame rate based on different driving signals are conducted,and evaluations in terms of uniformity and coverage are given.The comparative experiment is conducted too,and the results demonstrate the feasibility of this method.