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基于布里渊散射的全分布式光纤传感器的布里渊频移同时受应变和温度的影响,无法由单一的布里渊频移解析应变或温度的信息,这种交叉敏感问题制约了传感器的实用化。介绍了目前解决交叉敏感问题的主要方法及工作原理。研究了大有效面积非零色散位移光纤(LEAF)的布里渊散射谱与应变和温度的关系,实验发现布里渊谱具有三个布里渊峰,三个峰的布里渊频移与应变和温度成线性关系,第一个峰和第三个峰的布里渊峰峰值功率的差值与温度无关,但与应变成线性关系。最后基于实验结果提出了一种解决交叉敏感问题的方案,获得了大约130με的应变测量精度和8℃的温度测量精度。
The Brillouin frequency shift of a fully distributed optical fiber sensor based on Brillouin scattering can not be solved by a single Brillouin frequency shift to analyze the strain or temperature information under the influence of strain and temperature. This cross-sensitivity problem constrains the sensor’s Practical. The main methods and working principles for solving cross-sensitivity problems are introduced. The relationship between the Brillouin scattering spectrum and the strain and temperature of a large effective area non-zero dispersion-shifted fiber (LEAF) was studied. The Brillouin spectrum has three Brillouin peaks and the Brillouin frequency shifts of three peaks The strain and temperature are linear, and the difference between the Brillouin peak power of the first peak and the third peak is independent of temperature, but linearly proportional to strain. Finally, based on the experimental results, a solution to the cross-sensitivity problem was proposed. The strain measurement accuracy of about 130με and the temperature measurement accuracy of 8 ℃ were obtained.