基于应力强度干涉理论和薄弱环节分析的光子晶体光纤陀螺寿命评估

在空间飞行环境中，航天器承受着各种环境的作用，而每种环境因素都在一定程度上影响着航天器的工作寿命。光子晶体光纤是一种新型光纤，其比传统保偏光纤更耐辐照，是长寿命光纤陀螺(Fiber Optical Gyroscope，FOG)的首选，可以满足长寿命卫星的应用需要。将光纤陀螺特征寿命定义为强度，将热、辐照和振动等环境因素定义为应力，运用应力强度分析理论，采用最坏情况分析方法，分析了在常见应力联合作用下光纤陀螺的薄弱环节，评估了光纤陀螺的在轨工作寿命，验证了光子晶体光纤陀螺在某长寿命通信卫星上的适应性。分析结果表明，热和辐照是影响光子晶体光纤陀螺的重要因素。研究结论可用于有针对性地进行改进设计，为长寿命高可靠卫星提供技术支撑，具有显著意义。

Study on Life Evaluation of Photonic Crystal FOG Based on Stress-strength Interference Theory and Worst Case Analysis

In the space flight environment, spacecraft bears various environmental effects, and each environmental factor affects the working life of spacecraft to a certain extent. Photonic crystal fiber is a new type of fiber, which is more resistant to radiation than the traditional polarization maintaining fiber. It is the first choice of long-life fiber optic gyroscope(FOG) and can meet the needs of long-life satellite. In this paper, the characteristic life of FOG is defined as strength, and the environmental factors such as heat, radiation and vibration are defined as stress. Using the stress-strength analysis theory and the worst case analysis method, the weak links of FOG under the combined action of common stresses are analyzed, the on orbit working life is evaluated, and the adaptability of photonic crystal FOG in a long-life communication satellite is verified. The results show that heat and radiation are the important factors affecting the performance of photonic crystal FOG. It is significant that the research results can be used to improve the design and provide technical support for long life and high reliability satellites.