Abstract

The possibility of measuring strain (temperature) over distances up to 85 km in a single-ended optical fiber using the technique of low coherence Rayleigh reflectometry has been demonstrated. The indicated range is provided by employing Raman amplification of radiation in combination with amplification by short erbium doped fiber segments built into the fiber under test. The possibility of tuning a low coherence source in a wide range of wavelengths made it possible to measure strain in the range of 500 με, which is equivalent to 56°C in units of temperature. At a unit measurement time of 10 min and a spatial resolution of 2.6 m, the standard uncertainty of the strain measurements was 3.8 με and of the temperature ones was 0.42°C.

中文翻译：

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使用低相干瑞利反射仪实现85公里的应变（温度）测量距离范围

摘要

已经证明了使用低相干瑞利反射技术在单端光纤中测量长达85 km的距离上的应变（温度）的可能性。通过将辐射的拉曼放大与内置在被测光纤中的掺短纤维段的放大结合使用，可以提供指示范围。在很宽的波长范围内调谐低相干光源的可能性使测量500με范围内的应变成为可能，这相当于以温度为单位的56°C。在10分钟的单位测量时间和2.6 m的空间分辨率下，应变测量的标准不确定度为3.8με，温度测量的标准不确定度为0.42°C。