Zhao Yuanfang, Dai Maolin, Chen Zhenmin, Liu Xuanyi, Gandhi M S Aruna, Li Qian, Fu H Y
Opt Express. 2021 Jan 18;29(2):1090-1101. doi: 10.1364/OE.415857.
A novel fiber Michelson interferometer (FMI) based on parallel dual polarization maintaining fiber Sagnac interferometers (PMF-SIs) is proposed and experimentally demonstrated for temperature sensing. The free spectral range (FSR) difference of dual PMF-SIs determines the FSR of envelope and sensitivity of the sensor. The temperature sensitivity of parallel dual PMF-SIs is greatly enhanced by the Vernier effect. Experimental results show that the temperature sensitivity of the proposed sensor is improved from -1.646 nm/°C (single PMF-SI) to 78.984 nm/°C (parallel dual PMF-SIs), with a magnification factor of 47.99, and the temperature resolution is improved from ±0.03037°C to ±0.00063°C by optimizing the FSR difference between the two PMF-SIs. Our proposed ultrasensitive temperature sensor is with easy fabrication, low cost and simple configuration which can be implemented for various real applications that need high precision temperature measurement.
提出了一种基于平行双偏振保持光纤萨格纳克干涉仪（PMF-SI）的新型光纤迈克尔逊干涉仪（FMI），并通过实验证明其可用于温度传感。双PMF-SI的自由光谱范围（FSR）差异决定了包络的FSR和传感器的灵敏度。平行双PMF-SI的温度灵敏度通过 Vernier 效应得到极大增强。实验结果表明，所提出传感器的温度灵敏度从-1.646 nm/°C（单PMF-SI）提高到78.984 nm/°C（平行双PMF-SI），放大倍数为47.99，并且通过优化两个PMF-SI之间的FSR差异，温度分辨率从±0.03037°C提高到±0.00063°C。我们提出的超灵敏温度传感器具有易于制造、成本低和配置简单的特点，可用于各种需要高精度温度测量的实际应用。
