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报道了一种新型边孔光纤及边孔光纤光栅的研究结果。采用有限元法分析了边孔光纤内部的应力分布和双折射数值,并通过波长扫描技术对其双折射进行了测量,理论计算和实验测量结果表明双折射数值达到4×10-5。根据边孔光纤光栅两反射峰偏振态相互正交的特性,提出了一种基于偏振检测的波长检测方案对边孔光纤光栅的传感特性进行了测量。结果表明两峰中心波长间隔随温度变化的灵敏度仅有0.05 pm/℃,是普通单模光纤光栅温度灵敏度的1/184。提出了一种基于横向荷载压力增敏的新型边孔光纤光栅封装装置,使边孔光纤光栅双峰间距的压力灵敏度从5.6 pm/MPa增加到119.14 pm/MPa,增敏21倍,实现了温度不敏感的高灵敏度压力传感。
A new type of edge-hole fiber and edge-hole fiber grating is reported. The stress distribution and birefringence of the fiber in the edge-hole fiber were analyzed by the finite element method. The birefringence of the fiber in the edge-hole fiber was measured by wavelength-scanning technique. The theoretical calculation and experiment results show that the birefringence value reaches 4 × 10-5. According to the characteristics that the polarization states of the two reflection peaks of the edge-hole fiber grating are orthogonal to each other, a sensing scheme based on polarization detection is proposed to measure the sensing characteristics of the edge-hole fiber grating. The results show that the sensitivity of the center wavelength spacing of the two peaks with temperature changes is only 0.05 pm / ℃, which is 1/184 of the temperature sensitivity of an ordinary single mode fiber grating. A new type of edge-mounted FBG packaging device based on lateral load pressure sensitization was proposed, which increased the pressure sensitivity of the double-peak spacing of FBG from 5.6 pm / MPa to 119.14 pm / MPa and sensitized 21 times, Insensitive to high sensitivity pressure sensing.