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从理论上推导了长周期光纤光栅在均匀温度场和非均匀温度场中透射谱的特性,并实验验证长周期光纤光栅在均匀温度场中和非均匀温度场的光谱特性。实验证明,随温度升高,光纤光栅谐振波中心向长波方向漂移,反之亦然,且漂移量与温度的变化量呈线性关系。在非均匀温度场中,当长周期光纤光栅的光栅两端温度差改变时,谐振波的3dB展宽呈线性递增趋势。
The characteristics of the transmission spectra of long-period fiber gratings in uniform temperature field and inhomogeneous temperature field are derived theoretically. The spectral characteristics of long-period fiber gratings in uniform temperature field and inhomogeneous temperature field are experimentally verified. Experiments show that with the increase of temperature, the center of the FBG’s resonant wave drifts toward the longwave and vice versa, and there is a linear relationship between the drift and the temperature. In the non-uniform temperature field, the 3dB broadening of the resonance wave shows a linear increasing trend when the temperature difference between the two ends of the grating of the long period fiber grating changes.