应用频谱相关技术提高波长移位检测精确度

Improvement on the precision of wavelength shift detectionby using spectrum correlation technique

从频谱相关滤波理论入手,在理论上分析了将频谱相关技术用于光纤布拉格光栅传感系统波长移位检测中的合理性.分别对频谱相关法(SCSpectrumCorrelation)、峰值检测法(CPDConventionalPeakDetection)、数字滤波法(DFDigitalFilter)进行了数值模拟,实验结果和理论分析结果吻合,进一步分析发现,频谱相关法在数字滤波法的基础上进一步提高了波长移位检测的精确度.

The rationality of applying Spectrum correlation (SC) technique to wavelength shift detection in fiber Bragg gratings sensing systems was analyzed in theory. The simulation results of Spectrum Correction, Conventional Peak Detection and Digital Filter were given separately. And it is testified that the theory results accorded with the experiment results well. For further discuss and analyzes, we also found that the detection precision of Spectrum Correction technique is really better than that of conventional peak and digital filter techniques.