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高频CO2激光在扭曲的单模光纤上制作的长周期光纤光栅(LPFG)还原后会产生谐振峰分裂现象。基于这种光栅结构,用拍频理论对谐振峰分裂现象和扭曲特性做了解释和分析,实验结果与理论分析相吻合。由于这种光栅的两分裂峰具有几乎一样的温度灵敏度,因此提出可通过测量这种光栅两分裂峰之间的距离来实现扭曲量的测量,并且当扭曲方向不一样时,两分裂峰的距离会变大或变小,因此该扭曲传感器在实现高灵敏度扭曲传感时还可辨别扭曲的方向。这种传感器在工业领域将具有良好的潜在应用价值。
Long-period fiber grating (LPFG) produced by high-frequency CO2 laser on a twisted single-mode fiber produces a resonance peak splitting phenomenon. Based on this grating structure, the resonance frequency peak splitting phenomenon and distortion characteristics are explained and analyzed by the beat frequency theory. The experimental results are in good agreement with the theoretical analysis. Since the two split peaks of this grating have almost the same temperature sensitivity, it is proposed that the measurement of the twist amount can be achieved by measuring the distance between two split peaks of such a grating, and when the twist directions are different, the distance between two split peaks Become larger or smaller, the twist sensor can also recognize the direction of twist when achieving high-sensitivity twist sensing. This sensor will have good potential applications in the industrial field.