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光纤光栅在现代传感领域应用广泛,但交叉敏感特性严重制约了其发展。针对光纤光栅在传感领域应用中存在温度与应力交叉敏感的问题,提出了一种基于遗传算法的解调方案,建立了遗传算法的快速解调模型,经过数学分析得到遗传算法目标方程、适应度函数,系统讨论了参考光纤光栅与传感光栅的反射中心波长不同、反射峰值不同情况下的解调结果。数值研究结果表明,提出的基于遗传算法的解调方案可以有效地解调出参考光纤光栅与传感光栅参数不同情况下的温度与应变变化,有效地区分出温度与应力的影响,温度检测精度为0.1℃,应力检测精度为1.5με。打破了传统参考光纤光栅法要求传感光栅与参考光栅一致的要求,降低了系统的组建难度。
Fiber grating is widely used in the field of modern sensing, but its cross sensitivity has severely restricted its development. Aiming at the problem that fiber grating is cross-sensitive to temperature and stress in the field of sensing, a demodulation scheme based on genetic algorithm is proposed and a fast demodulation model of genetic algorithm is established. After mathematic analysis, the objective equation of genetic algorithm Degree function, the system discusses the reference fiber grating and the sensing grating reflection center wavelength is different, the reflection peak demodulation results under different circumstances. The numerical results show that the proposed demodulation scheme based on genetic algorithm can effectively demodulate the temperature and strain changes under the different parameters of reference fiber grating and sensor grating, effectively distinguish the effects of temperature and stress, and the accuracy of temperature detection Is 0.1 ℃, stress detection accuracy of 1.5με. Breaking the traditional reference fiber grating method requires sensing grating and reference grating the same requirements, reducing the difficulty of system formation.