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首页> 外文期刊>Optics and Photonics Journal >Optical Fiber Torsion Sensor with Mechanically Induced Long Period Fiber Gratings in Rare-Earth Doped Fibers
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Optical Fiber Torsion Sensor with Mechanically Induced Long Period Fiber Gratings in Rare-Earth Doped Fibers

机译：稀土掺杂光纤中具有机械感应长周期光栅的光纤扭力传感器

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摘要

In this work wavelength sensitivity in mechanically induced long period fiber gratings (MLPFG) is analyzed. This analysis is first carried out both in standard single-mode fiber SMF-28 and in Er-doped fibers. The mechanical analysis for both types of fibers under different torsion conditions is presented. In order to apply the torsion one of the fiber ends is fixed while torsion is applied on the other end. A MLPFG whose period is 503 μm is used to press the fiber after torsion is applied. This allows for micro curvatures to be formed on the fiber, which in turn generates a periodical index perturbation on it. Here, it was noted that the sensitive wavelength shift of the rejection bands is bigger for Er-doped fibers. For a torsion of 6 turns applied to 10 cm of doped fiber the wavelength peaks can be moved up to 25 nm, which is longer to what was detected on standard fibers. Therefore, by using Er-doped fibers to monitor torsion on structures will give more sensitive and accurate results than using standard fibers. These results can be employed for sensing applications, especially for small to medium size structures, which can be mechanical, civil or aeronautics.
机译：在这项工作中，分析了机械感应长周期光纤光栅（MLPFG）中的波长灵敏度。首先在标准单模光纤SMF-28和掺Er光纤中进行此分析。介绍了两种纤维在不同扭转条件下的力学分析。为了施加扭转，光纤的一端固定，而另一端施加扭转。施加扭转后，使用周期为503μm的MLPFG挤压纤维。这允许在纤维上形成微曲率，进而在纤维上产生周期性的折射率扰动。在此，注意到对于掺Er的光纤，抑制带的敏感波长偏移较大。如果对10 cm的掺杂光纤施加6圈扭转，则波长峰值可以移动到25 nm，这比在标准光纤上检测到的更长。因此，与使用标准光纤相比，通过使用掺Er光纤来监视结构上的扭转将获得更加灵敏和准确的结果。这些结果可用于传感应用，尤其是对于中小型结构，可以是机械，民用或航空领域。

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