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首页> 外文期刊>Applied optics >Dependence of the Brillouin gain spectrum on linear strain distribution for optical time-domain reflectometer-type strain sensors
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Dependence of the Brillouin gain spectrum on linear strain distribution for optical time-domain reflectometer-type strain sensors

机译：布里渊增益谱对光学时域反射计型应变传感器的线性应变分布的依赖性

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摘要

We theoretically derive the shape of the Brillouin gain spectrum, that is, the Brillouin backscattered-light power spectrum, produced in an optical fiber under conditions of a strain distribution that changes linearly with a constant slope. The modeled measurement system is an optical time-domain reflectometer-type strain sensor system. The linear strain distribution is one of the fundamental distributions and is produced in, for example, a beam to which a concentrated load is applied. By analyzing a function that expresses the shape of the derived Brillouin gain spectrum, we show that the strain calculated from the frequency at which the spectrum has a peak value coincides with that at the center of the effective pulsed light. In addition, the peak value and the full width at half-maximum of the Brillouin gain spectrum are both influenced by the strain difference between the two ends of the effective pulse. We investigate this influence in detail and obtain the relationship between strain difference and strain measurement error. (C) 2002 Optical Society of America. [References: 25]
机译：从理论上讲，我们得出了布里渊增益谱的形状，也就是布里渊背向散射功率谱，它是在应变分布以恒定斜率线性变化的条件下，在光纤中产生的。建模的测量系统是光学时域反射仪式应变传感器系统。线性应变分布是基本分布之一，并且例如在施加有集中载荷的梁中产生。通过分析表示导出的布里渊增益频谱的形状的函数，我们表明，根据频谱具有峰值的频率计算出的应变与有效脉冲光的中心处的频率一致。另外，布里渊增益谱的峰值和半峰全宽都受到有效脉冲两端之间的应变差的影响。我们将详细研究这种影响，并获得应变差与应变测量误差之间的关系。 （C）2002年美国眼镜学会。 [参考：25]

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