双倍布里渊频移的多波长掺铒光纤温度传感器

为了实现高灵敏度的光纤温度传感,提出并验证了一种具有双倍布里渊频移间隔的多波长掺铒光纤温度传感器。实验采用1558.214 nm波长的激光输出作为布里渊泵浦,经掺铒光纤放大器放大后再通过由2个三端口环形器和1段20 km的单模光纤构成的双倍频布里渊增益腔,其中单模光纤既是布里渊增益介质又是温度传感元。实验结果表明:在产生的7个高信噪比且稳定的双倍频下,得到的温度传感系数从2.186~15.328 MHz/℃可调,且最高阶斯托克斯波的温度测量误差为±0.322℃。

Multi-wavelength erbium-doped fiber temperature sensor with double Brillouin frequency shift

In order to realize high-sensitivity optical fiber temperature sensing,a multi-wavelength erbium-doped optical fiber temperature sensor with double Brillouin frequency shift interval is proposed and verified.In the experiment of this scheme,the laser output with a wavelength of 1558.214 nm is used as the Brillouin pump,which is amplified by the erbium-doped fiber amplifier,then passes through a double frequency cavity composed of two three-port circulators and a section of 20 km single-mode fiber,which is both the Brillouin gain medium and the temperature sensing element.The experimental results show that the temperature sensing coefficient can be adjusted from 2.186~15.328 MHz/℃under seven stable double frequencies with high signal-to-noise ratio,and the temperature measurement error of the highest Stokes wave is±0.322℃.