光谱背景噪声对光纤法-珀应变传感系统测量精度影响研究  

Study on the influence of background spectrum noise on the accuracy of optical fiber F-P strain sensing system

作　　者：朱永[1] 梅浩[1] 甘雄[1] 陈伟民[1] 

机构地区：[1]重庆大学光电工程学院光电技术及系统教育部重点实验室,重庆400030

出　　处：《仪器仪表学报》2009年第3期465-470,共6页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(60707010);重庆市自然科学基金(CSTC2007bb3125)资助项目

摘　　要：从理论上分析了光谱仪背景噪声对非本征型光纤法珀传感系统精度的影响,提出了"去光谱背景噪声"和"重心复合法"相结合的改进离散腔长变换(DGT)算法,并进行了实验研究。理论分析和实验研究表明,对于采用DGT解调算法的传感系统,光谱仪背景噪声会引入幅值为12微应变的周期性波动;实验结果还证明了改进算法能有效抑制这种周期性误差。The influence of background spectrum noise on the accuracy of an optical fiber extrinsic Fabry-Perot interferometer （EFPI） strain sensing system was analyzed. An improved discrete gap transform （DGT） demodulation algorithm with ＂optical spectrum background denoising＂ and ＂compound mass center calculation＂ functions is forward. Demonstration experiments were carried out. Both theoretical analysis and experimental result show that, in an EFPI strain sensing system using DGT demodulation algorithm, the spectrum background noise of the spectrometer will induce a periodic fluctuant error with the amplitude of 12μδ. Experimental results also demonstrate that this periodic fluctuant error can be suppressed by the improved DGT demodulation algorithm.

关 键 词：光纤法珀传感器 光谱 周期跳动误差 离散腔长变换 

分 类 号：TN253[电子电信—物理电子学]