This paper presents a fast demodulation algorithm to determine fiber Bragg grating (FBG) from spectra acquired by low wavelength resolution spectrometers. A modified and improved Buneman frequency estimation algorithm is employed in tracking FBG wavelength and eliminating FBG wavelength discontinuities in real-time wavelength demodulation calculations. The FBG demodulation algorithm was tested using a 512-element detector array spectrometer with a 156 pm/element resolution. At a 2-kHz spectrum acquisition rate, the demodulation algorithm achieved a 0.048 pm Bragg wavelength resolution. The computational efficiency and robustness of the new algorithm was compared with a Gaussian FBG peak fitting method. Our method provides a real-time demodulation scheme to track FBG wavelength using low-resolution spectrometers or tunable lasers. It has the potential to significantly reduce the cost of FBG interrogation systems that are employed in high-sensitivity and high-speed sensing applications.

中文翻译：

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使用 Buneman 频率估计从低分辨率光谱测量中快速解调光纤布拉格光栅波长

本文提出了一种快速解调算法，用于从低波长分辨率光谱仪获取的光谱中确定光纤布拉格光栅 (FBG)。在实时波长解调计算中跟踪FBG波长和消除FBG波长不连续性，采用改进和改进的Buneman频率估计算法。使用具有 156 pm/元素分辨率的 512 元素探测器阵列光谱仪测试 FBG 解调算法。在 2 kHz 频谱采集速率下，解调算法实现了 0.048 pm 布拉格波长分辨率。将新算法的计算效率和鲁棒性与高斯FBG峰值拟合方法进行了比较。我们的方法提供了一种使用低分辨率光谱仪或可调谐激光器跟踪 FBG 波长的实时解调方案。