面向飞机载荷监测的光栅解调系统设计

Design of grating interrogation system for aircraft load monitoring

针对飞机在复杂宽温环境下光纤光栅应变传感器应用需求,对光纤光栅解调系统进行优化设计,集成了热电冷却(TEC)温度控制器以及对数放大器。该系统由可调谐光源控制系统、光电转换系统、TEC控制系统等组成。利用法布里−珀罗(F-P)标准具进行标定,F-P标准具解调波长标准偏差为2.7 pm。通过温度循环实验对该系统的精度以及环境适应性进行了验证。在温度恒定时,标准具解调波长标准偏差最小为0.16 pm。在起落架地面静态加载试验中,试验结果表明中心波长与载荷施加呈线性关系,R^(2)大于0.9983。该系统精度高,宽温适应性好,能够满足飞机起落架载荷监测需求。

According to the application requirements of fiber Bragg grating strain sensors in complex wide temperature range environment,the fiber Bragg grating demodulation system was optimized and integrated with the thermoelectric cooling(TEC)temperature controller and logarithmic amplifier.The system consists of the tunable light source control system,photoelectric conversion system,TEC control system,etc.The standard deviation of the demodulation wavelength by the F-P etalon is 2.7 pm.The accuracy and environmental adaptability of the system are verified by temperature cycle experiment.At constant temperature,the minimum standard deviation of demodulation wavelength is 0.16 pm.In the static loading test of landing gear,the experimental results show that there is a linear relationship between center wavelength and load application,and R^(2) is greater than 0.9983.It is proved that the system has high precision and good adaptability to wide temperature range,and can meet the requirements of aircraft landing gear load monitoring.