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本文采用在一段单模光纤两端镀膜的方法构成光纤法布里－珀罗干涉腔，导出干涉腔反射光的数学模型，给出干涉腔与其它器件连接构成的干涉式光纤应变传感器的一般理论和测量方法．采用低反射率的光纤法布里－珀罗腔以改善光纤应变传感器的线性．输入、输出在同一侧便于使用．与电阻应变传感器相比精度高、适用范围广．
In this paper, the fiber Fabry-Perot interference cavity is formed by coating a single-mode fiber at both ends, and the mathematical model of the reflected light in the interference cavity is derived. The general theory of interferometric fiber strain sensor with interference cavity and other devices is given And measurement methods. Low reflectivity fiber Fabry-Perot cavity to improve fiber optic strain sensor linearity. Input, output on the same side easy to use. Compared with the resistance strain sensor, high precision, wide range of applications.