Sun Dexue, Liu Xianjin, Wang Fengjuan, Yang Jiuru
Appl Opt. 2020 Dec 20;59(36):11325-11331. doi: 10.1364/AO.409605.
The polarization-maintaining fiber-based Sagnac loop interferometer (PSLI) is frequently applied in directional torsion measurement, but may suffer from a large temperature cross talk. In this study, a novel method was proposed for fabrication of side-tapered PSLI by a two-step arc-discharge technique at the splicing point. The energy distribution of the taper region was characterized, and comprehensive tests were performed in terms of torsion and temperature. The experimental results showed that, through bias twisting, the measuring areas were effectively gapped and highly sensitive torsion and temperature responses were gained simultaneously. With a small wavelength shift, the torsion sensitivity reached 13.54 dB/rad in the range from -30 to 30 rad/m. Moreover, the temperature sensitivity was found to be -1.579/, with a near-zero intensity fluctuation. Therefore, the sensor fabricated herein successfully achieves simultaneous measurement of directional torsion and temperature with high sensitivity and ultralow cross talk. The proposed scheme has the merits of practicality, low cost, and ease of operation, and is very promising for multiparameter engineering monitoring.
基于保偏光纤的萨格纳克环干涉仪（PSLI）常用于定向扭转测量，但可能存在较大的温度串扰。在本研究中，提出了一种通过在熔接点采用两步电弧放电技术制造侧边锥形PSLI的新方法。对锥形区域的能量分布进行了表征，并针对扭转和温度进行了全面测试。实验结果表明，通过偏置扭转，有效分隔了测量区域，同时获得了高灵敏度的扭转和温度响应。在小波长偏移下，在-30至30 rad/m范围内扭转灵敏度达到13.54 dB/rad。此外，发现温度灵敏度为-1.579/，强度波动近乎为零。因此，本文制造的传感器成功实现了高灵敏度和超低串扰的定向扭转和温度同时测量。所提出的方案具有实用性、低成本和操作简便的优点，在多参数工程监测方面极具前景。
