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Optical Fiber Temperature and Torsion Sensor Based on Lyot-Sagnac Interferometer

机译：基于Lyot-Sagnac干涉仪的光纤温度和扭转传感器

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摘要

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.
机译：通过使用Lyot-Sagnac干涉仪，提出了一种光纤温度和扭转传感器，该干涉仪是通过将两部分高双折射（HiBi）光纤插入Sagnac环中而构成的。 HiBi光纤的两个插入部分具有不同的功能。一部分用作温度敏感区，另一部分可用作参考光纤。实验证明了基于所提出的干涉仪结构的温度和扭曲传感器。实验结果表明，输出光谱的包络线将随温度的变化而变化。计算得出的温度灵敏度为-17.99 nm /°C，与单个Sagnac干涉仪相比，其灵敏度提高了12倍。此外，频谱的条纹可见性将由于光纤扭曲而改变，并且测试结果表明，条纹可见性和扭曲角在360°扭曲角上完全符合正弦关系。因此，通过检测频谱的包络线偏移和边缘可见性，可以实现同时进行扭转和温度测量。

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