基于保偏光纤中正交偏振模干涉,提出了一种简单、新颖的光纤光栅动态应变解调系统,并且通过实验证实了该方案的可行性.该解调系统光学核心部分仅由一段带有反射镜的高双折射光纤和一个光纤起偏器构成.实验中动态应变解调分辨率达到了0.5nε/√Hz,频率范围为0.1～7.9 kHz微纳幅度振动信号获得了保真拾取.实验表明,该系统适合宽频率范围、微纳幅度的动态应变检测,为光纤光栅传感提供了一种简单、经济、适用范围更广的解调方案.
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