Fast and High-Precision Shape Sensing Based on Dual-Comb Fiber Bragg Grating Array Demodulation

• DOI: 10.1109/jlt.2024.3451053
• Publication Date: 2024-08-28T18:57:01Z
• Authors: Jianjun Yang; Jiansheng Liu; Baorui Yu; Minghui Ma; Liqian Zhang; Yifan Zhang; Hongfeng Shao; Xin Zhao; Zheng Zheng
• Keywords: Fiber Bragg Grating; PHOSFOS

This paper presents an innovative and efficient shape-sensing approach for optical fiber Bragg grating (FBG) arrays, employing the dual-comb spectroscopy (DCS) technique demodulation. scheme harnesses power of asynchronous sampling technology, enabling us to achieve high spatial resolution rapid demodulation shape sensing. It accomplishes this by demodulating ultrashort laser pulse signals reflected from gratings positioned at various locations. Our utilizes a single-cavity FBG system array identical FBGs within compact fiber-optic setup facilitate reconstruction. In static measurements, we have achieved impressive results, including submillimeter endpoint precision error less than 1% over distance range 423 mm sinusoidal arc-shaped structures with continuously varying curvatures. Furthermore, our demonstrates exceptional capabilities in dynamic capable capturing movements measurement rate exceeding 1 kHz. maintains millimeter-level resolving capability variations. Overall, proposed significantly enhances sensing capabilities, offering improved speed resolution. advancement opens opportunities fields, robotic control, human-machine interaction, surgical navigation.