基片式光纤光栅传感器加速度试验研究

Acceleration test of substrate-packaged fiber Bragg grating sensor

为测试光纤光栅(FBG)传感器是否可以承受由加速度引起的稳态惯性载荷,以及在承受这些载荷期间的传感性能,设计了一种铝合金基片封装式光纤光栅应变和温度传感器,并对其进行了加速度性能验证。确定了FBG应变和温度传感器的设计尺寸,阐述了封装过程,分析了FBG传感器的应变和温度传感机理,开发了基于体相位光栅和线阵光电探测器的光谱检测解调系统。搭建了加速度试验装置,并按照GJB150.15A“加速度试验”要求和方法对选取的FBG应变和温度传感器进行了加速度性能测试。试验结果表明:在加速度试验前后的2 min性能测试中,波长偏移量均未超过±50 pm,且光强变化未超过0.3 V;在加速度试验中,波长偏移量最大波动为±7 pm,光强均在1.3 V~4.003 V内。验证了所设计的光纤光栅传感器具备承受加速度载荷的能力,且承受载荷期间传感性能良好。

To test whether the fiber Bragg grating(FBG)sensor can endure the steady-state inertial loads caused by the acceleration and the sensing properties during the loads,a FBG strain and temperature sensor with aluminium alloy substrate package was designed,and the acceleration performance on the sensor was tested.The sizes of FBG strain and temperature sensor were designed and its package process was described.The strain and temperature sensing mechanisms of FBG sensor were analyzed,and the spectrum detection and demodulation system based on volume phase grating and linear array photodetector was developed.Finally,the acceleration test equipment was established,and the acceleration performance test of the selected FBG strain and temperature sensor was carried out in accordance with the requirements and methods of GJB150.15A acceleration test.The experimental results show that in the 2 min performance test before and after the acceleration test,the wavelength offset is below to±50 pm,and the change of light intensity is below to 0.3 V.In acceleration test,the maximum fluctuation of wavelength offset is±7 pm,and the light intensity is in the range of 1.3 V~4.003 V.It is proved that the designed FBG sensor has the ability to endure the acceleration loads and has the good sensing performance during the acceleration loads.