封装聚合物对光纤光栅压力传感增敏的影响

Effect of Polymer Package on Pressure Sensitivity of Fiber Bragg Gratings

研究了封装聚合物材料参数对光纤光栅压力传感增敏效果的影响,结果表明:随着聚合物泊松比的增加,光纤光栅压力灵敏度减小.杨氏模量对压力灵敏度的影响与聚合物的的泊松比有关,当泊松比在较小范围内时(<0.4),光纤光栅的压力灵敏度随着聚合物的杨氏模量减小而迅速减小,当聚合物泊松比在较大范围内时(>0.4),聚合物的杨氏模量对光纤光栅压力灵敏度的影响较小.与裸露的光纤布喇格光栅相比,选择泊松比为0.45和杨氏模量为1.0×108N.m-2的聚合物进行封装,可将光纤布喇格光栅压力灵敏度提高404倍.

The effects of the properties of package polymers on pressure sensitivity of fiber bragg gratings were studied. It is found that the pressure sensitivity of fiber bragg grating decreases with the increase of the Poisson＇s ratio of polymers. The influence of the Young＇s modulus of package polymers on pressure sensitivity is related to the Poisson＇s ratio. When the Poisson＇s ratio of the polymers is low（lower than 0.4）, the pressure sensitivity decreases rapidly with the decrease of the Young＇s modulus. And when the Poisson＇s ratio is high（higher than 0.4）, the Young＇s modulus show influence on the pressure sensitivity. The pressure sensitivity of fiber bragg grating packaged by a kind of polymer with Poisson＇s ratio 0.45 and Young＇s modulus 1.0×10^8 N·m^2 are about 404 times than that of the bare fiber bragg grating.