一种新型瑞利BOTDA系统的研究

发布时间：2018-01-16 19:40

  本文关键词：一种新型瑞利BOTDA系统的研究　出处：《红外与激光工程》2017年01期 　论文类型：期刊论文

  更多相关文章： 瑞利布里渊光时域分析 单端 受激布里渊散射 瑞利散射

【摘要】：搭建了一种新型的基于瑞利散射的布里渊光时域分析(Rayleigh Brillouin optical time domain analysis,RBOTDA)传感系统。该系统工作在单端,能克服传统BOTDA双端接入的缺点;采用两个EOM并联的结构产生含有连续基底光的脉冲光,探测光由基底连续光的瑞利散射提供,避免了多种受激布里渊散射(stimulated Brillouinscattering,SBS)作用带来的干扰,信噪比更高,传感距离更长;采用双边带探测方法,有效减少泵浦脉冲的损耗与非本地效应。建模解析了该系统中的SBS作用过程,并实验验证了系统的可行性。结果表明,布里渊增益谱完好地贴合洛伦兹曲线,非本地效应得到了有效的抑制;在2.4km光纤上,室温25℃下泵浦脉宽50ns时,布里渊频移为10.867GHz,布里渊线宽约为40.21MHz。
[Abstract]:A novel Brillouin optical time domain analysis based on Rayleigh scattering is proposed. Rayleigh Brillouin optical time domain analysis. RBOTDA sensor system, which works in single terminal, can overcome the shortcoming of traditional BOTDA dual terminal access. Two EOM parallel structures are used to generate pulsed light with continuous substrate light, and the detection light is provided by Rayleigh scattering of the substrate continuous light. The interference caused by stimulated Brillouin scattering (SBS) is avoided, the signal-to-noise ratio is higher and the sensing distance is longer. The two-sideband detection method is used to effectively reduce the loss of pump pulses and non-local effects. The SBS process in the system is modeled and analyzed, and the feasibility of the system is verified by experiments. Brillouin gain spectrum fits the Lorentz curve perfectly and the non-local effect is effectively suppressed. The Brillouin frequency shifts to 10.867 GHz and the Brillouin linewidth is about 40.21 MHz at room temperature of 25 鈩，

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