Complete discrimination of strain and temperature using Brillouin frequency shift and birefringence in a polarization-maintaining fiber
Complete discrimination of strain and temperature using Brillouin frequency shift and birefringence in a polarization-maintaining fiber
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DOI：
10.1364/oe.17.001248
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发表时间：
2009-02-02
期刊：
影响因子：
3.8
通讯作者：
Hotate, Kazuo
中科院分区：
文献类型：
--
作者：
Zou, Weiwen;He, Zuyuan;Hotate, Kazuo
本文提出了一种利用熊猫型保偏纤维实现应变和温度同时完全判别测量的新方法。通过测量受激布里渊散射（SBS）的谱和在SBS中产生的动态声光栅的谱，测量了光纤中布里渊频移和双折射两个独立的光学参数，得到了对应变和温度的两个独立响应。我们发现布里渊频移和双折射在应变依赖性上具有相同的符号，而在温度依赖性上具有相反的符号。在实验中，通过检测动态声光栅的衍射谱，以接近10（-8）的精度表征了PMF的双折射特性。该方法在0.08℃和3个微菌株范围内，对菌株和温度进行了精确的识别。(C) 2009年美国光学学会
This paper presents a novel method that realizes simultaneous and completely discriminative measurement of strain and temperature using one piece of Panda-type polarization-maintaining fibre. Two independent optical parameters in the fiber, the Brillouin frequency shift and the birefringence, are measured by evaluating the spectrum of stimulated Brillouin scattering (SBS) and that of the dynamic acoustic grating generated in SBS to get two independent responses to strain and temperature. We found that the Brillouin frequency shift and the birefringence have the same signs for strain-dependence but opposite signs for temperature-dependence. In experiment, the birefringence in the PMF is characterized with a precision of similar to 10(-8) by detecting the diffraction spectrum of the dynamic acoustic grating. A reproducible accuracy of discriminating strain and temperature as fine as 3 micro-strains and 0.08 degrees Celsius is demonstrated. (C) 2009 Optical Society of America