光纤增敏温度传感器及其压力敏感性实验研究

Experimental Study on Fiber Bragg Grating Temperature Enhanced Sensor and Its Pressure Sensitivity

介绍并制作了一种光纤布拉格光栅（FBG）温度传感器。通过在不锈钢圆柱管内设置粘贴裸光栅的铜质支撑架,实现完全隔绝压力测量温度参数。在无压力情况下,在35℃-85℃温度范围内,对传感器进行多次加减压温度实验。结果表明,传感器重复性、迟滞性及线性度较好,实测温度灵敏度为30.98 pm/℃,与理论计算相对误差仅为0.3%,约为裸光纤光栅的2.83倍,封装FBG温度传感器的分辨力约为0.03℃。对传感器进行了压力敏感实验,在35℃恒温和5-45 MPa压力环境下及在35℃恒温和40 Mpa恒压下对温度传感器进行45 min的压力实验,实验结果表明传感器中心波长无变化;另外,在40 MPa恒压下和在35℃-85℃温度范围内对传感器进行测试,并和无压力情况对比,结果表明在相同温度测试点,传感器中心波长基本无变化。

A fiber Bragg grating（FBG） temperature sensor is presented.By setting bare grating support shelves,the temperature is measured with pressure isolation encapsulation.Multiple plus-minus temperature tests are carried out.Results show that the sensor under the condition of no press and the temperature of 35 ℃~85 ℃ has a good repeatability,hysteresis and linearity.The temperature sensitivity is 30.98 pm/℃ and the relative error is 0.3%,which is about 2.83 times of bare FBG.The accuracy is about 0.03 ℃.The pressure sensitivity tests are executed,and the results show that the sensor wavelength has no change under the condition of 35 ℃ and 5~45 MPa or the condition of 35 ℃ and 45 MPa.Moreover,compared the results under the condition of no press and 40 MPa,it is found that the sensor wavelength has no changes.