分布式光纤振动传感系统的多级零频点定位研究

发布时间：2018-06-03 02:58

  本文选题：光纤传感 + Sagnac　； 参考：《传感技术学报》2017年05期

【摘要】：为了减少直线结构Sagnac分布式光纤传感系统的定位误差,提出一种多级零频点的优化方法,通过分析直线结构Sagnac分布式光纤传感定位原理,确定固定的采样速率下离散化是造成定位误差大的原因。并分析得出振动信号频域曲线会周期出现多个零频点,进而对振动定位的多级零频点优化方法进行了理论推导,阐明高倍零频点下的定位误差会有效减小。通过实验验证表明,在总长为11.769 km的传感光纤上,优化后的定位方法在不改变采样速率下可保证定位误差提升到±20 m范围内,可以基本满足系统对外界振动信号进行精确定位的要求。
[Abstract]:In order to reduce the positioning error of linear Sagnac distributed optical fiber sensor system, a multi-level zero frequency optimization method is proposed. The principle of linear Sagnac distributed optical fiber sensor positioning is analyzed. Discretization at a fixed sampling rate is the cause of large positioning errors. It is concluded that there will be several zero frequency points in frequency domain curve of vibration signal, and then the optimization method of multi-level zero frequency point for vibration location is deduced theoretically, and it is shown that the positioning error can be reduced effectively at high zero frequency point. The experimental results show that the optimized positioning method can increase the positioning error to 卤20m without changing the sampling rate on the sensing fiber with a total length of 11.769 km. It can basically meet the requirements of the system for accurate positioning of external vibration signals.
【作者单位】： 太原理工大学新型传感器与智能控制教育部与山西省重点实验室;山西煤层气(天然气)集输有限公司;
【基金】：国家自然科学基金项目(51375327) 山西省回国留学人员科研项目(2016-035) 山西省煤基重点科技攻关项目(MQ2014-09)
【分类号】：TP212
，

本文编号：1971201