混沌激光布里渊散射的分布式光纤温度传感

1)新型传感器与智能控制教育部重点实验室,太原 030024; 2)太原理工大学物理与光电工程学院,光电工程研究所,太原 030024

光纤光学; 分布式光纤传感; 温度测量; 光相干法; 混沌激光; 布里渊散射

Distributed optical fiber temperature sensing based on chaotic light Brillouin scattering
Ma Zhe1,2, Zhang Mingjiang1,2, Liu Hui1,2, Liu Yi1,2, and Wang Yuncai1,2

1)Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education, Taiyuan 030024, P.R.China2)College of Physics and Optoelectronics, Institute of Optoelectronic Engineering, Taiyuan University of Technology, Taiyuan 030024, P.R.China

fiber optics; distributed fiber sensing; temperature measurement; optical coherent; chaotic laser; Brillouin scattering

DOI: 10.3724/SP.J.1249.2015.06586

备注

提出一种基于混沌激光布里渊散射的分布式光纤温度传感方法.采用相干长度为88.53 cm的混沌激光作为光源,结合相干域反射技术,利用可变光延迟线调节参考光光程,通过检测传感光纤不同位置的混沌布里渊散射光与参考光的干涉信号,获知整条光纤的温度信息分布.搭建实验系统,研究了注入光功率与偏振态对混沌激光布里渊散射光的特性影响.实验研究待测光纤中固定点的布里渊频移随温度的变化情况,获得1.27 ℃/MHz的温度系数.在长度为155 m的普通单模光纤上实现空间分辨率为1.2 m的分布式光纤温度传感测量.

We proposed a novel approach to distributed optical fiber temperature sensing based on chaotic laser Brillouin scattering. By utilizing a chaotic light with 88.53 cm coherence length as the probe light and the coherent domain reflection technology, and using a rapid variable optical delay line to adjust the reference light path, we measured temperatures by detecting the interference of the back Brillouin scattering light and reference light at different locations along the sensing fiber. We set up an experimental system to investigate the effect of injected optical power and polarization pattern on the performance of the chaotic laser Brillouin scattering, conducted an experimental study on the variation of the Brillouin frequency shift(BFS)with temperature, and achieved the temperature coefficient of 1.27 ℃/MHz and a spatial resolution of 1.2 m for the 155 m standard single-mode optical fiber.

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