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论证了聚合物光纤布拉格光栅(POFBG)在固体火箭发动机(SRM)纤维缠绕壳体大应变测量中应用的可行性。介绍了POFBG的制作和应用情况,阐述了POFBG传感方面的工作。建立了POFBG的应变模型、温度模型和湿度模型,分析了应变参量、温度参量、湿度参量对反射波长漂移量的影响,并提出了应变参量与湿度参量、温度参量分离的方案。通过MATLAB,对应变、温度和湿度变化进行了数值仿真。结果表明:反射波长随应变的增加而增大,随温度的升高而减小,随湿度的增加而增大,并受到温度和湿度的交叉影响,这与文献报道的实验结果比较吻合。文中的研究有益于进一步开展聚合物光纤光栅在SRM纤维增强复合材料应变测量中的研究。
The feasibility of applying polymer fiber Bragg grating (POFBG) to the measurement of large strain in fiber wound shell of solid rocket motor (SRM) is demonstrated. The production and application of POFBG are introduced, and the work of POFBG sensing is described. The strain model, temperature model and humidity model of POFBG are established. The influence of strain, temperature and humidity on the reflected wavelength drift is analyzed. The scheme of separating the strain, humidity and temperature is proposed. Through MATLAB, the numerical simulation of strain, temperature and humidity was carried out. The results show that the reflection wavelength increases with the increase of strain, decreases with the increase of temperature, increases with the increase of humidity, and is affected by the cross of temperature and humidity, which is in good agreement with the experimental results reported in the literature. The research in this paper is beneficial to the further research of polymer fiber grating in the strain measurement of SRM fiber reinforced composites.