半导体光电, 2018, 39 (5): 733, 网络出版: 2019-01-10
一种减小ΦOTDR光纤扰动传感系统中频率漂移误差的新定位算法
A New Localization Algorithm to Reduce The Frequency Drift Error in ΦOTDR Optical Fiber Sensing System
激光器频率漂移 定位算法 频谱分析 特征频率区间 laser frequency drift ΦOTDR ΦOTDR localization algorithm spectrum analysis characteristic frequency range
摘要
针对相位敏感光时域反射计(ΦOTDR)分布式光纤扰动传感系统中激光器的频率漂移严重影响系统定位准确度的问题, 提出了一种新的基于频谱分析的定位算法。该算法将采集的散射曲线数据进行傅里叶变换, 然后选择特征频率区间进行功率谱累加得出定位结果, 可以有效抑制激光器频漂引起的定位误差。最后搭建了长度为8km的样机进行定位算法的测试, 系统的信噪比得到了改善, 定位准确性提高, 验证了算法的有效性。
Abstract
The frequency drift of laser greatly affects the positioning accuracy of the phasesensitive optical timedomain reflectometer (ΦOTDR) distributed optical fiber disturbance sensing system. So a new localization algorithm based on spectrum analysis was proposed to replace the traditional timedomain moving difference and average algorithm. The collected scattering curve data was taken as the Fourier transform, and then the characteristic frequency interval was selected to calculate the location result, which can effectively suppress the positioning error caused by the laser frequency drift. In addition, a prototype of 8km was built to test the positioning algorithm. Test results indicate that the signaltonoise ratio of the final system is improved, and the effectiveness of the algorithm is verified.
魏源, 王夏霄, 邬战军, 于佳. 一种减小ΦOTDR光纤扰动传感系统中频率漂移误差的新定位算法[J]. 半导体光电, 2018, 39(5): 733. WEI Yuan, WANG Xiaxiao, WU Zhanjun, YU Jia. A New Localization Algorithm to Reduce The Frequency Drift Error in ΦOTDR Optical Fiber Sensing System[J]. Semiconductor Optoelectronics, 2018, 39(5): 733.