Xie Heng, Sun Junqiang, Feng Danqi
Opt Express. 2016 May 30;24(11):11475-82. doi: 10.1364/OE.24.011475.
Simultaneous temperature and strain sensing is experimentally demonstrated based on erbium-doped fiber laser (EDFL) and Brillouin erbium fiber laser (BEFL) incorporated in a single ring laser cavity. The EDFL can be switched to BEFL by injecting the Brillouin pump into the laser cavity. Longitudinal modes beat frequency and Brillouin frequency shift are monitored to discriminate strain and temperature. The longitudinal modes beat frequency is measured by observing the self-beating signals of the EDFL, while the Brillouin frequency shift is measured by monitoring the heterodyning signal of the BEFL. The simultaneous measurement errors of strain and temperature are within ± 25.8με and ± 0.8°C. The sensor is of simple structure and compact size.
基于集成在单个环形激光腔中的掺铒光纤激光器（EDFL）和布里渊掺铒光纤激光器（BEFL），通过实验证明了同时进行温度和应变传感。通过向激光腔中注入布里渊泵浦，EDFL可以切换为BEFL。监测纵向模式拍频和布里渊频移以区分应变和温度。纵向模式拍频通过观察EDFL的自拍信号来测量，而布里渊频移通过监测BEFL的外差信号来测量。应变和温度的同时测量误差在±25.8με和±0.8°C以内。该传感器结构简单，尺寸紧凑。
