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基于布里渊时域分析(BOTDA)对温度和应变的检测原理,构建了分布式光纤传感入侵定位系统。该系统只检测应变事件位置,不检测温度和应变绝对值,因此简化了BOTDA技术中复杂的频率检测方法。系统以脉冲光作为抽运光,反方向传输的连续光作为探测光。分析表明该入侵定位系统在抽运光产生的布里渊峰值频率小于连续光的频率时具有较高的灵敏度,存在一最佳频率偏移使探测灵敏度最高。当传感光纤所处温度改变时,可以通过调节抽运光频率使系统始终保持最佳的灵敏度。
Based on the detection principle of temperature and strain in Brillouin time-domain analysis (BOTDA), a distributed optical fiber sensor intrusion localization system is constructed. The system detects only the location of the strain event and does not detect temperature and strain absolute values, thus simplifying the complex frequency detection method in BOTDA technology. The system uses pulsed light as pumping light and continuous light transmitted in the opposite direction as probe light. The analysis shows that the intrusion localization system has higher sensitivity when the Brillouin peak frequency generated by pumping light is smaller than that of continuous light, and an optimal frequency offset has the highest detection sensitivity. When the sensing fiber temperature changes, you can adjust the pump light frequency so that the system always maintain the best sensitivity.