基于反射光谱特征辨识的光纤气压与温度集成监测方法

发布时间：2018-04-20 00:10

  本文选题：反射光谱辨识 + 光纤光栅　； 参考：《光谱学与光谱分析》2017年09期

【摘要】：针对飞行器机载环境多参量综合测试需求,研究了一种基于反射光谱特征辨识的光纤布拉格光栅(FBG)气压与温度集成监测方法,给出了基于膜片式结构的双参量传感机理及其理论模型。采用基于耦合模理论的OptiGrating软件,得到不同气压与温度条件下光纤布拉格光栅传感器仿真反射光谱。在此基础上,借助弹塑性和恢复性能优良的平膜片感压机构,构建了膜片式双光纤气压/温度集成监测模型。研究表明,恒温条件下应变传感光纤光栅反射光谱随气压增加而逐渐向短波方向偏移,其中心波长灵敏度约为0.803 0nm·MPa~(-1),且反射谱主峰及其旁瓣峰值均随气压变化呈现良好线性关系;当气压恒定而温度变化时,处于仅感温不受力状态的温度传感光纤光栅反射光谱中心波长灵敏度约为9.39pm·℃~(-1);当气压与温度交叉变化时,能够实现对变温条件下的微小气压变化实时监测。传感光纤光栅受非均匀应变效应反射光谱存在一定啁啾现象,其反射光谱旁瓣峰值波长随环境温度、气压变化均会发生偏移,具有良好线性关系,且在不同气压下反射光谱对应的同一阶数旁瓣峰值幅度相等。该研究能够为航空航天器系统多物理参量在线综合测试提供有益帮助。
[Abstract]:In order to meet the requirements of multi-parameter integrated measurement for airborne environment of aircraft, a method of integrated monitoring of pressure and temperature of fiber Bragg grating (FBG) based on reflection spectrum feature identification is studied. The mechanism and theoretical model of two-parameter sensor based on diaphragm structure are presented. The simulation reflectance spectra of fiber Bragg grating sensors under different pressure and temperature are obtained by using OptiGrating software based on coupling mode theory. On the basis of this, an integrated pressure / temperature monitoring model of double optical fiber with diaphragm is constructed by means of flat diaphragm pressure mechanism with good elastoplastic and restoring properties. The results show that the reflectance spectrum of strain sensing fiber Bragg grating shifts to the shortwave direction with the increase of atmospheric pressure at constant temperature. The sensitivity of the central wavelength is about 0.803 0nm MPA ~ (-1) ~ (-1), and the main peak of the reflection spectrum and the peak value of the sidelobe show a good linear relationship with the change of the pressure. When the pressure is constant and the temperature changes, the sensitivity of the center wavelength of the reflected spectrum of the fiber Bragg grating is about 9.39pm 鈩，

本文编号：1775352