Bai Zhuoya, Yan Fengping, Han Wenguo, Zhang Luna, Cheng Dan, Wang Wei, Li Ting, Qin Qi, Guo Ying, Du Xuemei, Zhou Hong
Opt Express. 2021 Apr 26;29(9):13778-13786. doi: 10.1364/OE.422772.
A novel approach for ultrafast and temperature-insensitive strain interrogation using a polarization-maintaining photonic crystal fiber (PM-PCF) based Sagnac loop interferometer (SLI) and linear wavelength-to-time (WTT) mapping is proposed and experimentally demonstrated. The PM-PCF incorporated in the SLI is used as the sensing element to achieve stable strain sensing with ultra-low temperature-dependence due to its intrinsic thermal insensitivity, which can be used to eliminate the cross-sensitivity effect and increase the measurement accuracy. A dispersive element is employed to realize the WTT mapping and real-time strain interrogation is obtained by converting the strain-encoded wavelength shift to time shift in the temporal domain, which can be directly monitored by a real-time oscilloscope. The proposed system offers an ultrafast interrogation speed of 100 MHz and a strain sensitivity of -0.17 ps/με.
提出并通过实验证明了一种新颖的方法，该方法利用基于保偏光子晶体光纤（PM-PCF）的萨格纳克环干涉仪（SLI）和线性波长-时间（WTT）映射实现超快速且对温度不敏感的应变询问。纳入SLI中的PM-PCF用作传感元件，由于其固有的热不敏感性，可实现具有超低温度依赖性的稳定应变传感，这可用于消除交叉敏感效应并提高测量精度。采用色散元件实现WTT映射，并通过将应变编码的波长偏移转换为时域中的时间偏移来获得实时应变询问，该时间偏移可由实时示波器直接监测。所提出的系统提供100 MHz的超快速询问速度和-0.17 ps/με的应变灵敏度。
