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Simultaneous strain and temperature sensor based on the numerical reconstruction of polarization maintaining fiber Bragg gratings

机译:基于保偏光纤布拉格光栅数值重构的同时应变和温度传感器

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When a short-length fiber Bragg grating is inscribed into a polarization-maintaining fiber, the resonant peaks produced by birefringence can overlap. In this case, the discrimination between strain and temperature effects is only possible by means of polarization control devices, i.e. a linear polarizer and a polarization controller. To avoid this complexity and the measurement errors that it involves, we propose a novel demodulation technique based on the numerical reconstruction of the grating physical parameters. Our technique evaluates the grating parameters from the amplitude spectrum by means of the coupled-mode equations. The convergence tool used to search the solutions is the Nelder-Mead simplex algorithm. The method is tested on uniform and apodized Bragg gratings and a very good accuracy is reported. The method is finally applied to a 2 mm-long uniform polarization-maintaining grating in order to simultaneously measure longitudinal strain and temperature. (c) 2005 Elsevier Ltd. All rights reserved.
机译:当将短长度光纤布拉格光栅内切到保偏光纤中时,由双折射产生的共振峰会重叠。在这种情况下,只有借助于偏振控制装置,即线性偏振器和偏振控制器,才可以在应变和温度效应之间进行区分。为了避免这种复杂性及其所涉及的测量误差,我们提出了一种基于光栅物理参数的数值重构的新型解调技术。我们的技术通过耦合模式方程从振幅谱评估光栅参数。用于搜索解的收敛工具是Nelder-Mead单纯形算法。该方法在均匀且切趾的布拉格光栅上进行了测试,并报道了非常好的准确性。该方法最终应用于2 mm长的均匀偏振保持光栅,以便同时测量纵向应变和温度。 (c)2005 Elsevier Ltd.保留所有权利。

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