【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。更多还原

【Abstract】 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 12με.Experimental results also demonstrate that this periodic fluctuant error can be suppressed by the improved DGT demodulation algorithm.更多还原