设计了一种扫描激光器型光纤光栅波长解调仪, 采用滑动平均滤波方法拟合光纤布拉格光栅反射谱, 基于扫描激光器输出的同步触发信号与波长对应性, 计算得到光纤布拉格光栅反射谱的中心波长, 简化了解调过程。相比传统的宽带光源解调方法, 降低了解调的复杂度和不稳定性, 实现对布拉格波长的高精度、快速解调。实验结果表明, 解调仪对光纤布拉格光栅波长的解调稳定性可达±2pm, 温度与波长变化的线性度达到0.9984, 温度测量误差小于0.5℃,能够满足实际应用的需要。

An optical fiber grating wavelength demodulation instrument based on the swept laser is designed. The fiber Bragg grating reflection spectrum is fitted by the sliding average filtering method. The central wavelength of the reflecting spectrum of the fiber Bragg grating is calculated with the characteristics of the wavelength corresponding to the output synchronized trigger signal of the swept laser, which simplifies the process of demodulation. Compared with the traditional broadband light source demodulation method, the complexity and instability of the demodulation are reduced, and the high-precision and fast demodulation of the wavelength of fiber Bragg grating sensors are realized. The experimental results show that the demodulation instrument achieves the stability of ±2pm in the wavelength demodulation of the fiber Bragg grating, and the linearity of the change of temperature and wavelength reaches 0.9984, and the measuring error of temperature is less than 0.5℃ , which can meet the needs of practical applications.