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中文摘要：
介绍了基于长周期光纤光栅（LPFG）的3种传感器模型，给出了灵敏度的定义，并计算出了3种模型各自的灵敏度。结果表明：涂覆LPFG作溶液传感时比普通LPFG灵敏度提高了30倍左右。涂覆LPFG传感器具有广阔的应用前景。
英文摘要：
Three models of sensors based on long period fiber gratings（LPFG） are introduced. The definition of the sensitivity of the sensors is given, and the sensitivities of the ：three sensors are calculated. The results show that coated LPFG has a higher sensitivity comparing to those uncoated, and the sensitivity is improved 30 times compared with two-layered LPFG. With high sensibility, the three-layered LPFG will have a wide application prospect in industrial area.
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