基于LPFG与锥形光纤级联的温度与应变测量传感器

Temperature and strain measurement sensor based on LPFG cascaded with tapered fiber

工程中对具有多参量同时测量功能的光纤传感器有很大的市场需求。为了实现多参量的同时测量,将长周期光纤光栅(LPFG)与锥形光纤级联构成传感器,研究了传感器对环境温度与轴向应变的传感特性,利用传感器透射谱中2个谐振峰波谷的温度和应变灵敏度构建测量矩阵,消除了交叉敏感,完成了温度与轴向应变的同时测量。实验结果表明:传感器透射谱谐振峰波谷的中心波长随温度变化、轴向应变变化均有很好的线性关系,最大温度灵敏度达到40.12 pm/℃,最大应变灵敏度为-1.502 pm/με。

In engineering practice,the optical fiber sensor with multi-parameter simultaneous measurement function has great market demand.For multi-parameter simultaneous measurement,a long-period fiber grating(LPFG)and a tapered fiber are cascaded to form a sensor.The sensing characteristics of the sensor for ambient temperature and axial strain are studied.Using the temperature and strain sensitivity of the two resonant peak wave-valley in the sensor transmission spectrum,the measurement matrix is constructed to eliminate cross sensitivity and complete the simultaneous measurement of temperature and axial strain.The experimental results show that the center wavelength of the resonant peak wave-valley of the sensor has a good linear relationship with temperature and axial strain.The maximum temperature sensitivity is 40.12 pm/℃and the maximum strain sensitivity is-1.502 pm/με.