高频CO_2激光脉冲写入的掺硼长周期光纤光栅温度应变特性

Temperature and Strain Characteristic of Long Period Fiber Grating(LPFG) Induced by High Frequency CO_2 Laser Pulses

高频CO2激光脉冲写入的长周期光纤光栅(LPFG)对温度比较敏感、应变不敏感,通常应用在温度传感器做温度测量.普通长周期光纤光栅温度灵敏度只有0.052 nm.℃-1,而用掺硼光纤制作的长周期光纤光栅温度灵敏度达到0.171 nm.℃-1,比普通长周期光纤光栅更加灵敏.因而应用在温度传感提高了传感器的灵敏度以及测温精度.本文利用高频CO2激光脉冲写入法在B-Ge光纤上写入,并从理论和实验上就其温度、应变特性进行了全面的研究.

In this paper,temperature and strain characteristic of long period fiber grating(LPFG) induced by high frequency CO2 laser pulses is theoretically and experimentally studied.By the characteristic of higher temperature sensitivity and lower strain sensitivity,it is usually implemented as temperature sensor.The temperature sensitivity of B-doped LPFG is 0.171 nm·℃-1 while the temperature sensitivity of an ordinary LPFG is 0.052 nm·℃-1.Thus it can enhance the sensitivity and precision of temperature sensor.