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首页> 外文期刊>Applied optics >Double peak-induced distance error in short-time-Fourier-transform-Brillouin optical time domain reflectometers event detection and the recovery method
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Double peak-induced distance error in short-time-Fourier-transform-Brillouin optical time domain reflectometers event detection and the recovery method

机译：短时傅立叶变换-布里渊光时域反射仪中双峰引起的距离误差事件检测与恢复方法

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The measured distance error caused by double peaks in the BOTDRs (Brillouin optical time domain reflectometers) system is a kind of Brillouin scattering spectrum (BSS) deformation, discussed and simulated for the first time in the paper, to the best of the authors' knowledge. Double peak, as a kind of Brillouin spectrum deformation, is important in the enhancement of spatial resolution, measurement accuracy, and crack detection. Due to the variances of the peak powers of the BSS along the fiber, the measured starting point of a step-shape frequency transition region is shifted and results in distance errors. Zero-padded short-time-Fourier-transform (STFT) can restore the transition-induced double peaks in the asymmetric and deformed BSS, thus offering more accurate and quicker measurements than the conventional Lorentz-fitting method. The recovering method based on the double-peak detection and corresponding BSS deformation can be applied to calculate the real starting point, which can improve the distance accuracy of the STFT-based BOTDR system. (C) 2015 Optical Society of America
机译：据作者所知，本文首次讨论并模拟了BOTDRs（布里渊光学时域反射仪）系统中由双峰引起的距离误差，这是一种布里渊散射光谱（BSS）变形。 。双峰是布里渊光谱的一种变形，对提高空间分辨率，测量精度和裂缝检测很重要。由于沿光纤的BSS峰值功率的变化，阶跃形频率转换区域的测量起点发生偏移，并导致距离误差。零填充短时傅立叶变换（STFT）可以在不对称且变形的BSS中恢复由过渡引起的双峰，因此比传统的洛仑兹拟合方法提供了更准确和更快的测量。可以采用基于双峰检测和相应的BSS变形的恢复方法来计算实际起点，从而可以提高基于STFT的BOTDR系统的距离精度。 （C）2015年美国眼镜学会

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