Zhang Hailiang, Wu Zhifang, Shum Perry Ping, Shao Xuguang, Wang Ruoxu, Dinh Xuan Quyen, Fu Songnian, Tong Weijun, Tang Ming
Opt Express. 2018 Jan 8;26(1):544-551. doi: 10.1364/OE.26.000544.
We propose and experimentally demonstrate a directional torsion sensor based on a Mach-Zehnder interferometer formed in a multicore fiber (MCF) with a ~570-μm-long helical structure (HS). The HS was fabricated into the MCF by simply pre-twisting and then heating with a CO laser splicing system. This device shows the capability of directional torsion measurement from -17.094 rad/m to 15.669 rad/m with the sensitivity of ~0.118 nm/(rad/m). Moreover, since the multiple interferences respond differently to torsion and temperature simultaneously, the temperature cross-sensitivity of the proposed sensor can be eliminated effectively. Besides, the sensor owns other merits such as easy fabrication and good mechanical robustness.
我们提出并通过实验证明了一种基于马赫-曾德尔干涉仪的定向扭转传感器，该干涉仪在具有约570μm长螺旋结构（HS）的多芯光纤（MCF）中形成。通过简单地预扭转然后用CO激光熔接系统加热，将HS制作到MCF中。该装置显示出能够在-17.094 rad/m至15.669 rad/m范围内进行定向扭转测量，灵敏度约为0.118 nm/(rad/m)。此外，由于多次干涉对扭转和温度的响应不同，所提出的传感器的温度交叉灵敏度可以有效地消除。此外，该传感器还具有易于制造和良好的机械鲁棒性等其他优点。
