多光纤光栅测量主要包括混合FBG/长周期光栅(long period grating)法、双周期光纤光栅法、光纤光栅/F-P腔集成复用法、双FBG重叠写入法。各种方法各有优缺点。FBG/LPG法解调简单,但很难保证测量的是同一点,精度为9×10-6,1.5℃。双周期光纤光栅法能保证测量位置,提高了测量精度,但光栅强度低,信号解调困难。光纤光栅/F-P腔集成复用法传感器温度稳定性好、体积小、测量精度高,精度可达20×10-6,1℃,但F-P的腔长调节困难,信号解调复杂。双FBG重叠写入法精度较高,但是,光栅写入困难,信号解调也比较复杂。
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