光纤布拉格光栅压力增敏的实验研究

Study on Experiment of Fiber Bragg Grating Pressure Sensitivity

近年来光纤光栅作为压力、温度、应变等传感器已经成功地应用于光纤传感领域中。然而裸露的光纤光栅对于外界物理参量的变化灵敏度不高,因此有必要对光纤光栅进行增敏封装,以提高其对外界环境变化的灵敏度。采用两种聚合物材料均匀混合,将其对布拉格光纤光栅进行封装。在23℃情况下对封装后的光栅进行了压力实验,实验表明用两种聚合物封装后的光栅对压力有很高的灵敏性,在0～10MPa范围内压力灵敏度为-122×10-4MPa。

Fiber Bragg gratings (FBG) using as pressure, temperature, and strain sensors are triumphantly applied in optical sensing fields in recent years. However, the sensitivity of a bare FBG is insensitive to the ambient environment. So it is necessary to package FBG to enhance its sensitivity. Two polymers are mixed together to package fiber grating. Pressure experiments are studied at 23℃. It can be seen that fiber grating packaged with polymers is high sensitivity for pressure in the range from 0 MPa to 10 MPa. The measured pressure sensitivity is -1.22×10 -4 /MPa, more than 62 times than that of a bare fiber grating.