理论推导了高双折射光纤环镜轴向应变灵敏度公式, 讨论了在高双折射光纤材料和入射光源不变的前提下, 高双折射光纤长度以及作为敏感元件的传感长度与传感器轴向应变灵敏度的关系, 讨论了入射光源相同时高双折射光纤材料与传感器轴向应变灵敏度的关系。 结果表明: 在高双折射光纤材料和入射光源不变的前提下, 高双折射光纤环镜波长变化与轴向应变成线性关系, 线性灵敏度为高双折射光纤材料和入射光源中心波长决定的常数, 与接入的高双折射光纤长度、 作为敏感元件的传感长度无关。

In the present paper, the theoretical expressions for the axial strain sensitivity of high-birefringence fiber loop mirror(Hi-Bi FLM) was developed. The key influence factors on the axial strain sensitivity are discussed for the same input light source as the high-birefringence fiber material is certain, including the high-birefringence fiber length and the sensing length. The relationship between the high-birefringence fiber material and the axial strain sensitivity is discussed for the same input light source. The results show that the wavelength shift of high-birefringence fiber loop mirror is linear with the axial strain, and the linear sensitivity is constant decided by the high-birefringence fiber material and the center wavelength of input light source, having nothing to do with the high-birefringence fiber length and the sensing length.