具有复合式法珀腔的光纤压力传感器的解调  

Demodulation of Cascade Optical Fiber Fabry-Perot Pressure Sensor

作　　者：姜丽娟[1] 江俊峰[1] 刘铁根[1] 刘琨[1] 刘宇[1] 梁霄[1] 王少华[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院光电信息技术教育部重点实验室,天津300072

出　　处：《光子学报》2012年第3期283-287,共5页Acta Photonica Sinica

基　　金：国家重点基础研究发展计划(No.2010CB327802);国家自然科学基金(No.11004150);天津市科技支撑重点项目(No.11ZCKFGX01900);教育部博士点新教师基金(No.200800561020);中国博士后科学基金资助项目(No.201003298);深圳市传感器技术重点实验室开放基金(No.SST201013)资助

摘　　要：对由三个反射面构成的复合式法珀腔的光纤法珀压力传感器进行了输出光谱理论分析,提取了含有传感器腔长信息的包络.提出了基于干涉级次拟合的解调算法,仿真分析了传感法珀腔腔长范围为160～215μm的光谱信号.结果显示,在不同信噪比下,基于干涉级次拟合的算法可获得较好的测量准确度,同一信噪比下,该准确度不依赖腔长变化,也不依赖光谱解调波长分辨率变化.实验结果表明,基于干涉级次拟合结果曲线残差的均方根差为0.012μm,验证了该算法的有效性.Through analysing the spectrum of the cascade optical fiber Fabry-Perot pressure sensor composed with three reflecting surfaces,the lower envolope of the spectrum can be used to demodulate the sensor′s cavity length.A novel algorithm based on fitting of interference-order is proposed.Simulation analysis is carried out with the cavity length of F-P2 variating between 160 μm to 215 μm.It is shown that the results precision can be improved using the novel method at the different signal to noise ratio(SNR),and is not impacted by sensor′s cavity length and the optical spectrum resolution ratio at the same SNR.The experiment is also carried out,and the calculation results show that the residuals of the least square curve fitting is 0.012 μm,which verify the effectiveness of the new algorithm.

关 键 词：光纤法珀 压力传感器 干涉 光谱 

分 类 号：TN253[电子电信—物理电子学]