光纤光栅温度压力同时区分测量技术研究

Research on simultaneous discriminating measurement of temperature and pressure using fiber grating sensing technology

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 double-fiber Bragg grating sensor for simultaneous discriminating measurement of temperature and pressure is proposed based on thin-wall flexible metal alloy cylinder.FBG1 and FBG2 are stuck to the hollow and solid sections of cylinder along the axis direction by strong pastern.The changes of temperature and pressure result in the wavelength shift of FBG1.Only the change of temperature in the cylinder causes the wavelength shift of FBG2,the pressure′s influence can be neglected.The external pressure and t...