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Pulse coding linearization for Brillouin optical time-domain analysis sensors
Optics Letters ( IF 3.6 ) Pub Date : 2018-11-12 , DOI: 10.1364/ol.43.005607
Jon Mariñelarena , Haritz Iribas , Alayn Loayssa

We introduce a simple method to extend the performance of pulse coding techniques in their application to Brillouin optical time-domain analysis sensors (BOTDA). It is based on applying a simple logarithmic processing on the detected probe wave that compensates the deviation from linearity of the sensor response for long code lengths. The technique ensures that the accumulated effect of a sequence of pulses is equal to the linear addition of the effects of the individual components, which is the essential condition to ensure a correct decoding of the probe gain measurement. We experimentally demonstrate the compensation of the Brillouin frequency shift error induced by the accumulated gain nonlinearity. Furthermore, a proof-of-concept 80 km sensing link within a total 200 km fiber loop demonstrated a better than 2 MHz precision with 2 m spatial resolution.

中文翻译:

布里渊光学时域分析传感器的脉冲编码线性化

我们介绍一种简单的方法来扩展脉冲编码技术在布里渊光学时域分析传感器(BOTDA)的应用中的性能。它基于对检测到的探测波进行简单的对数处理,从而补偿了较长代码长度下传感器响应线性度的偏差。该技术可确保脉冲序列的累积效应等于各个分量效应的线性加和,这是确保对探头增益测量值进行正确解码的必要条件。我们通过实验证明了由累积增益非线性引起的布里渊频移误差的补偿。此外,
更新日期:2018-11-16
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