频域插值与窗宽优化提升外调制OFDR空间分辨率研究  

Study on Spatial Resolution Improvement of Externally-Modulated OFDR with Frequency Domain Interpolation and Window Width Optimization

作　　者：申振 张建国 白清 梁昌硕 张昆 王宇 靳宝全 SHEN Zhen;ZHANG Jianguo;BAI Qing;LIANG Changshuo;ZHANG Kun;WANG Yu;JIN Baoquan(Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education and Shanxi Province,Taiyuan University of Technology,Taiyuan Shanxi 030024,China;Shanxi Transportation Technology Research&Development Co.,Ltd.,Taiyuan Shanxi 030600,China)

机构地区：[1]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,山西太原030024 [2]山西省交通科技研发有限公司,山西太原030600

出　　处：《传感技术学报》2023年第10期1615-1621,共7页Chinese Journal of Sensors and Actuators

基　　金：山西省重点研发计划项目(202102150101005);中国博士后科学基金资助项目(2021M691989)。

摘　　要：外调制OFDR系统可通过减小数据处理过程中的滑动窗宽来提高空间分辨率。然而,窗宽过小会使传感定位结果出现“假峰”,进而降低定位准确度,即传感空间分辨率和定位准确度之间存在相互制约关系。提出频域插值和窗宽优化方法,在数据处理流程中利用频域插值的方法提高系统的定位准确度,通过综合评估系统的定位误差,权衡窗宽和插值位数规模,实现在兼顾定位准确度的前提下进一步提升系统空间分辨率。阐述了OFDR系统传感原理,研究了影响系统空间分辨率各关键参数,搭建了外调制OFDR温度定位传感系统,在1000 m传感光纤上进行了实验验证。实验结果表明,在同等测量条件下,采用频域插值和窗宽优化方法将系统空间分辨率由3 m提升至了1.5 m,能有效提升OFDR系统的定位空间分辨率。The spatial resolution of externally-modulated OFDR systems can be improved by reducing the sliding window width value during data processing.However,excessive reduction of sliding windows would cause"ghost peaks"in the sensing and positioning results,which further decrease the positioning accuracy.A mutual constraint occurs between the sensing spatial resolution and the positioning accuracy.A scheme combining frequency domain interpolation and window width optimization is proposed in order to increase positioning accuracy during data processing.A configuration including both window width value and interpolation amount is set with a thorough evaluation of positioning error,which is capable of improving the measurement spatial resolution without diminishing positioning accuracy.The externally modulated OFDR temperature localization sensing system with 1000 m sensing fiber is created for testing the proposed scheme.The experimental results show an enhancement of spatial resolution from 3 m to 1.5 m under the same measurement settings,demonstrating the efficiency of the proposed scheme at enhancing OFDR measurement spatial resolution.

关 键 词：光频域反射系统 空间分辨率 频域插值 窗宽优化 

分 类 号：TN253[电子电信—物理电子学]