提出了一种基于菲佐干涉仪的并联复用光纤法珀加速度传感器的解调原理及系统,其中光纤法珀加速度传感器是基于惯性质量引起法珀腔腔长变化实现加速度传感的原理。针对此并联复用系统,建立了菲佐干涉仪的相对输出光强与光纤法珀加速度传感器的法珀腔腔长和菲佐干涉仪的厚度之间的关系模型,进一步建立了基于菲佐干涉仪的光纤法珀加速度传感器系统的加速度传感理论模型。在此基础上对菲佐干涉仪解调并联复用光纤法珀加速度传感器信号的原理进行了数值仿真,并对基于菲佐干涉仪解调的多通道光纤法珀加速度传感器并联复用能力进行了分析。研究结果表明,数值仿真结果和理论分析相吻合,菲佐干涉仪解调多通道光纤法珀加速度传感器并联复用系统具有可行性。

A demodulation principle and system for the multi-channel multiplexed Fabry-Pérot fiber-optic accelerometers in parallel based on a Fizeau interferometer are proposed,and the Fabry-Pérot fiber-optic accelerometers are based on the principle that the acceleration can be sensed through changing the length of the Fabry-Pérot cavity by the inertial mass. The function of the relative output intensity from the Fizean interferometer with the Fabry-Pérot cavity length of the accelerometers and the wedge thickness of the Fizeau interferometer is established. Furthermore,a theoretical acceleration model for the multiplexed Fabry-Pérot fiber-optic accelerometers based on Fizeau interferometer is also established. On these bases,the demodulation and multiplexing principle of the multiplexed Fabry-Pérot fiber-optic accelerometers based on the Fizeau interferometer are numerically simulated and the multiplexing capacity is analyzed. The research results indicate that the numerical results are consistent with the theoretical analysis and the accelerometers are feasible.