Shao Li-Yang, Zhang Xinpu, He Haijun, Zhang Zhiyong, Zou Xihua, Luo Bin, Pan Wei, Yan Lianshan
Center for Information Photonics & Communications, School of Information Science and Technology, Southwest Jiaotong University, Chengdu 611756, China.
Sensors (Basel). 2016 Oct 24;16(10):1774. doi: 10.3390/s16101774.
An optical fiber temperature and torsion sensor has been proposed by employing the Lyot-Sagnac interferometer, which was composed by inserting two sections of high-birefringence (HiBi) fiber into the Sagnac loop. The two inserted sections of HiBi fiber have different functions; while one section acts as the temperature sensitive region, the other can be used as reference fiber. The temperature and twist sensor based on the proposed interferometer structure have been experimentally demonstrated. The experimental results show that the envelope of the output spectrum will shift with the temperature evolution. The temperature sensitivity is calculated to be -17.99 nm/°C, which is enlarged over 12 times compared to that of the single Sagnac interferometer. Additionally, the fringe visibility of the spectrum will change due to the fiber twist, and the test results reveal that the fringe visibility and twist angle perfectly conform to a Sine relationship over a 360° twist angle. Consequently, simultaneous torsion and temperature measurement could be realized by detecting the envelope shift and fringe visibility of the spectrum.
一种基于利奥-萨尼亚克干涉仪的光纤温度和扭转传感器被提出，该干涉仪是通过在萨尼亚克环中插入两段高双折射（HiBi）光纤构成的。插入的两段HiBi光纤具有不同的功能；其中一段作为温度敏感区域，另一段可作为参考光纤。基于所提出的干涉仪结构的温度和扭转传感器已通过实验得到验证。实验结果表明，输出光谱的包络将随温度变化而移动。计算得出温度灵敏度为-17.99 nm/°C，与单个萨尼亚克干涉仪相比，放大了12倍以上。此外，光谱的条纹可见度会因光纤扭转而改变，测试结果表明，在360°扭转角范围内，条纹可见度与扭转角完全符合正弦关系。因此，通过检测光谱的包络移动和条纹可见度，可以实现扭转和温度的同时测量。
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