An electromagnetically driven single-fiber scanner that utilizes a two-degrees-of-freedom (DOF) second-order resonance to realize a larger field scanning scale has been proposed and verified by experimental measurement. A 2DOF system structure, including fiber, magnet, and weight, has been designed, which can execute high-order resonance modal to extend the scanning angle in the limited dimensional tube of the endoscope with 2-mm outer diameter. A low-cost, flexible microcoil embedded in polyimide film is also fabricated to drive the fiber-magnet-weight 2DOF system to vibrate. The magnetic field distributions of the microcoil with different structural parameters are simulated. The experimental measurement verifies that the scanner utilizing the second-order resonance mode has successfully realized a 9.47° scanning scale, which is much larger than the 2.98° obtained at the traditional first-order resonance mode. The scanning locus of fiber tip in the fabricated scanner probe has been obtained in the xy plane by standard position sensitive detector (PSD). The developed fiber scanner probe is promising to the ultrathin endoscope used in the narrow space of the human body.

中文翻译：

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利用两个自由度（2DOF）高阶共振实现更大扫描角度的单纤维内窥镜扫描仪探头

提出并利用了二自由度（DOF）二次共振实现更大的场扫描规模的电磁驱动单纤维扫描仪，并通过实验测量进行了验证。设计了一个2DOF系统结构，包括纤维，磁体和重物，该结构可以执行高阶共振模态，以扩展外径为2 mm的内窥镜有限尺寸管中的扫描角。还制造了嵌入聚酰亚胺薄膜中的低成本，柔性微线圈，以驱动重量轻的2DOF系统振动。模拟了具有不同结构参数的微线圈的磁场分布。实验测量结果证明，利用二阶共振模式的扫描仪已成功实现了9.47°的扫描比例，比传统的一阶共振模式获得的2.98°大得多。已通过标准位置敏感检测器（PSD）在xy平面中获得了已制成的扫描仪探头中纤维尖端的扫描轨迹。开发的光纤扫描仪探头有望用于人体狭窄空间的超薄内窥镜。