利用双周期光纤光栅实现应变和温度同时测量

Simultaneous Measurement of Strain and Temperature Using a Single Dual-Period Fiber Grating

提出了一种新颖双周期光纤光栅传感器。在同一段氢载光纤上先后写入长周期光纤光栅、短周期布拉格光纤光栅 ,利用长周期光栅和布拉格光栅对应变和温度敏感性的差异 ,可实现应变和温度的同时测量。实验中采用这种灵敏结构的双周期光栅 ,在 0～ 170 0 με和 2 0℃～ 12 0℃范围内 ,测量精度可达到± 16 με和± 0 8℃。

A novel dual period fiber grating sensor is demonstrated, which can measure strain and temperature simultaneously. The dual period fiber grating consists of a long period fiber grating (LPG) and a fiber Bragg grating (FBG) which is written in the same section of an uncovered hydrogen loaded fiber orderly. The Bragg wavelength of LPG and that of FBG have different sensitivity to strain and temperature, then strain and temperature can be determined simultaneously by measuring the two transmitted Bragg wavelengths of the dual period fiber grating. The accuracy of the sensory in measuring strain and temperature is estimated to be ±16 με in a range from 0 to 1700 με and ±0.8 ℃ from 20 ℃ to 120 ℃ respectively.