FFP边带滤波技术研究.pdfVIP

SEMICONDUCTOR OPTOELECTRONICS　Vol. 25 No. 1 Feb. 2004 光电技术应用 FFP 边带滤波技术研究 1 1 2 2 巩宪锋 , 王长松 , 郭转运 , 吕可诚 ( 1 北京科技大学 机械工程学院 , 北京 100083; 2 南开大学 物理学院 , 天津 300071) ( ) 摘 　要 : 　以双光束干涉原理为基础,推导了光纤法布里珀罗腔 FFP 边带滤波器的反射率方 程 ,讨论了端面反射率对其特性的影响 ;通过与光纤迈克尔逊、MZ 解调方法比较分析了 FFP 边带 滤波器的热稳定性问题 ;对 FFP 在光纤光栅传感解调中的应用 ,采用泰勒展开方法进行了一阶线性 近似 ,用线性边带滤波方法实现了布拉格光纤光栅传感器的应变测量 ,最大测量误差为 3. 8 个微 应 ,满量程测量精度为 6 ‰,能满足一般工业测量应用。 关键词 : 　光纤法布里珀罗腔 ; 边带滤波 ; 光纤光栅 ; 波长解调 ( ) 中图分类号: TN235 　文献标识码 : A 　文章编号 : 1001 - 5868 2004 01 - 0072 - 04 Research on FFP Edge Filter GONG Xianfeng1 , WANG Changsong1 , GUO Zhuanyun2 , L Kecheng2 ( 1. Mechanical Engineering School , Beijing University of Science and Technology , Beijing 100083 , CHN; 2. Institute of Physics , Nankai University , Tianjin 300071 , CHN) Abstract : 　Based on the principle of two beam interference , the reflectivity equation of FFP edge filter is developed. The influence of reflectivity from two ends of FFP cavity is discussed. The temperature sensitivity is compared with fiber Michelson and MZ interferometer. With the application of FFP to the demodulation of fiber grating , the reflectivity equation of FFP is simplified to a linear equation approximately , which has been used to measure the strain of FBG sensor. The result shows that the maximum error is 3. 8 microstrains , with the precision in full scale of 6 , which can meet the requirements of measurement for the industry. Key words : 　fiber FP ; linear filt