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本文推导出一种可用于机敏材料与结构的偏振调制型光纤应变传感器的理论模型，研究了在横向应变载荷作用下，双折射光纤中应变对光的传播与光的双折射的影响。分析表明，传感器的拍长与光纤中主光轴的原方向都对光的双折射以及传感灵敏度有较大影响。
In this paper, a theoretical model of a polarization-modulated fiber optic strain sensor that can be used in smart materials and structures is deduced. The effect of strain on light propagation and light birefringence in birefringent fibers under transverse strain loading is studied. The analysis shows that both the birefringence of the light and the sensitivity of the sensor have a great influence on the beat length of the sensor and the original orientation of the main optical axis in the optical fiber.