摘要
长周期光纤光栅具有波长选择损耗的带阻滤波特性 .其谐振波长随光纤包层直径的减小而向长波方向漂移 .环境温度、外部折射率指数的变化会导致谐振波长位移 .由此提出一种敏感度增强的温度传感方案 .推导了长周期光纤光栅谐振波长与温度之间的关系模型 .在光纤纤芯中写入长周期光纤光栅 ,通过腐蚀方法减小其包层直径 ,随后在光栅外再涂覆聚合物包层 .用此器件测量所得温度传感特性 ,其实验结果与仿真结果基本一致。其温度灵敏度超过 5 .2 nm/℃ .
LPFGs are band rejection fiber filters with wavelength dependent loss. Its resonance wavelengths shift towards the direction of longer wavelength with reduced cladding diameter. The shift for resonance wavelengths is produced with environmental temperature and external refractive index. According to this a temperature sensing scheme with enhanced sensitivity is proposed. The relation between resonance wavelengths of LPFG and environmental temperature is modeled. A LPFG is UV written in the core of a piece of fiber, whose diameter is beforehand corrosively reduced. Then the LPFG is recoated with polymer material. Sensing characteristics is measured for the device. The result of experiment is accordant with that of simulation. And its temperature sensitivity is more than 5.2 nm/℃.
出处
《传感技术学报》
CAS
CSCD
2002年第1期60-63,共4页
Chinese Journal of Sensors and Actuators
关键词
长周期光纤光栅
谐振波长
温度传感
long period fiber grating
resonance wavelength
temperature sensing
