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Strain distribution measurement in optical cables using the multi-pointed fiber bragg gratings

机译:使用 多角 光纤布拉格 光栅 在 光缆 的应变分布 测量

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摘要

Strain distribution along an optical fiber inside cables were optically measured by placing fiber Bragg gratings (EBG) with different reflecting wavelengths on the fiber. As a method for controlling the reflecting wavelength of each grating, various tension was applied to the fiber during UV exposure. We controlled the Bragg wavelength for 1 7nm (approx. 1.4% tension) with a single mask. Gratings were fabricated at regular intervals on a fiber for a slot type optical-fiber cable. The strain distribution induced by bending the cable was observed. Distribution measurements in a spatial resolution of 50mm, strain measurement precision of 0.002% was possible. We confirmed a strain distribution responding in accordance to the structure of the fiber locus inside slot type cables. The sensing fiber with multi-pointed FBGs has the same mechanical strength as normal fibers by UV exposed over the coating. Sensing fibers can be used in the cabling process and also in traction and installation.
机译:通过将光纤布拉格光栅(EBG)用纤维上的不同反射波长放置光纤布拉格光栅(EBG)来光学测量沿着光纤的应变分布。 作为用于控制每个光栅的反射波长的方法,在UV曝光期间将各种张力施加到纤维上。 使用单个面具控制37nm(约1.4%张力)的布拉格波长。 以规则的间隔在用于槽型光纤电缆的纤维上定期制造光栅。 观察通过弯曲电缆引起的应变分布。 在空间分辨率为50mm的空间分辨率下,应变测量精度为0.002%。 我们确认了根据槽型电缆的纤维基因座的结构响应的应变分布响应。 具有多尖FBG的感测纤维具有与涂层上的UV暴露在涂层上的正常纤维相同的机械强度。 传感纤维可用于布线过程,也可以在牵引过程中使用。

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