新颖的光纤Bragg光栅压强传感器的实验研究

提出了一种基于圆柱形容器和活塞结合的光纤Bragg光栅（FBG）传感模型。将FBG粘接在基底材料上，基底材料固定在活塞和容器底部间，容器内压力的变化导致活塞移动进而带动FBG所受拉力的变化，从而实现对外界压强的检测。该传感器的压强响应灵敏度系数理论值和实验值分别为0．9200nm／MPa和0．8223nm／MPa，分别为裸FBG灵敏度系数的306和274倍。该传感器有很好的线性度，线性度为0．9998。可以改变该传感器的有关参数来调节传感器的压强灵敏度系数，实现不同压强范围的测量。

Experimental Study of Novel Fiber Bragg Grating Pressure Sensors

A novel high sensitivity fiber Bragg grating(FBG) pressure sensor was brought forward based on columned vessel and piston.FBG was stuck to the fundus material by high intension pastern.Fundus material was fixed between the piston and the bottom of columned vessel.The pressure variation in the columned vessel results in the motion of the piston and drives the change of the tension in the FBG,then the external pressure can be measured by testing the reflective wavelength of FBG.The theoretical and experimental pressure sensitivity coefficient of the proposed sensor are 0.92 nm/MPa and 0.822 3 nm/MPa,which are 306 and 274 times of that of the bare FBG respectively.The FBG sensor has good linearity,and the correlation is 0.999 8.The pressure sensitivity can be changed by changing the size of fundus material and the area of piston to meet the measurements of different pressure ranges.