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提出一种基于金属合金薄壁弹性圆筒双光纤Bragg光栅(FBG)温度压力同时区分测量的传感模型。将FBG1和FBG2分别沿着圆筒的轴线方向粘贴在空心段外壁上和底座实心的外壁面上。圆筒内压力和温度的变化将引起FBG1波长的变化,温度的变化引起FBG2波长的变化,通过FBG2对FBG1的温度补偿进行温度和压力的同时区分测量。在100℃内2、0 MPa压力下,实验测得传感器的压力响应灵敏度系数约为0.012 nm/MPa,温度响应灵敏度系数约为0.012 nm/℃。
A sensing model based on the temperature-pressure measurement of thin-walled flexible cylindrical dual-fiber Bragg gratings (FBG) is presented. The FBG1 and FBG2 are respectively adhered to the outer wall of the hollow section and the solid outer wall surface of the base along the axial direction of the cylinder. Cylinder pressure and temperature changes will cause changes in FBG1 wavelength, temperature changes caused by FBG2 wavelength changes by FBG2 FBG1 temperature compensation for simultaneous temperature and pressure measurements. The pressure response sensitivity coefficient of the sensor was about 0.012 nm / MPa and the temperature response sensitivity coefficient was about 0.012 nm / ℃ under the pressure of 2,0 MPa at 100 ℃.