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High-spatial-resolution distributed strain measurement in optical fiber with Rayleigh scatter

机译:瑞利散射在光纤中的高空间分辨率分布式应变测量

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摘要

A method of measuring strain over 30-cm intervals to an accuracy of 10 microstrain in unaltered low-loss communications-grade single-mode optical fiber is presented. The method uses a tunable external cavity diode laser to measure the reflected intensity of a reflector-fiber system as a function of wavelength. This measurement is performed with no strain applied to the fiber to produce a reference and then again after a strain has been induced. Cross correlation of the Rayleigh scatter spectra from a selected section of fiber in the strained and unstrained states determines the spectral shift resulting from the applied strain. [References: 10]
机译:提出了一种在不变的低损耗通信级单模光纤中测量30 cm间隔内的应变,精度为10微应变的方法。该方法使用可调外腔二极管激光器来测量反射镜-光纤系统的反射强度与波长的关系。在没有施加应变到光纤以产生参考值的情况下执行该测量,然后在引起应变之后再次进行。来自处于应变和非应变状态的光纤的选定部分的瑞利散射光谱的互相关确定了由施加的应变导致的光谱偏移。 [参考:10]

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