Zhang Feng, Wang Ying, Bai Zhiyong, Liu Shen, Fu Cailing, Huang Yijian, Liao Changrui, Wang Yiping
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
Guangdong and Hong Kong Joint Research Centre for Optical Fibre Sensors, Shenzhen University, Shenzhen 518060, China.
Sensors (Basel). 2020 Mar 9;20(5):1490. doi: 10.3390/s20051490.
A highly sensitive torsion sensor can be constructed by combining a twisted photonic crystal fiber with a liquid-filled waveguide in its air-hole cladding. The torsion sensitivity of this type of sensor is determined directly by the phase-matching conditions between the fiber core mode and the liquid waveguide mode, which can be improved by tuning the helicity (denoted by the initial twist rate, ) of the twisted photonic crystal fiber. The enhancement mechanism of on the sensitivity of the proposed torsion sensor is investigated theoretically, followed by experimental verifications, and a torsion sensitivity as high as 446 nm∙mm∙rad can be obtained by tailoring these parameters. Experimental results show that the torsion sensitivity increases with decreasing from 3.142 to 3.925 rad/mm, which are in consistence with that of the numerical predictions. The demonstrated torsion sensor is expected to contribute to the development of highly sensitive torsion-related photonic crystal fiber devices.
通过将扭曲的光子晶体光纤与空气孔包层中填充液体的波导相结合，可以构建一种高灵敏度的扭转传感器。这种类型传感器的扭转灵敏度直接由光纤芯模与液体波导模之间的相位匹配条件决定，通过调整扭曲光子晶体光纤的螺旋度（由初始扭转率表示）可以提高该灵敏度。从理论上研究了螺旋度对所提出的扭转传感器灵敏度的增强机制，随后进行了实验验证，通过调整这些参数可获得高达446 nm∙mm∙rad的扭转灵敏度。实验结果表明，扭转灵敏度随着从3.142到3.925 rad/mm的减小而增加，这与数值预测结果一致。所展示的扭转传感器有望为高灵敏度扭转相关光子晶体光纤器件的发展做出贡献。
