光学精密工程2025，Vol.33Issue(12)：1842-1852,11.DOI:10.37188/OPE.20253312.1842
基于虚拟噪声电平的分布式光纤振动传感系统性能优化
Performance optimization of distributed optical fiber vibration sensing system based on virtual noise level
摘要
Abstract
The distributed optical fiber vibration sensing system usually uses the relative intensity ratio method to identify and locate the vibration event,which ignores the influence of noise level on the system dynamic range,thus restricting the improvement of the event location accuracy and dynamic range.In this paper,the relationship between the noise level and the dynamic range of the system was studied under the condition that the event-location accuracy of the system was ensured.A virtual noise level that correspond-ed to the average voltage of the near-zero amplitudes in the optical-time-domain-reflectometry signal was then added,and a performance-optimization algorithm based on this virtual noise level was proposed.In the experiment,a phase-sensitive optical-time-domain-reflectometry system was built,and a laser pulse with a pulse width of 50 ns was used to conduct vibration-event-location testing along a sensing fiber ap-proximately 15 km long.By applying the optimization algorithm with the virtual noise level,the noise lev-el was removed from the original optical-time-domain-reflecting data.Subsequently,virtual noise levels with amplitudes of 25%,50%,75%,100%,125%,150%,175%and 200%of the mean value of the near-zero amplitude of the signal were respectively added,in order to determine the virtual noise level that ensured the system dynamic range and the signal-to-noise ratio of the vibration signal were overall opti-mal.The amplitude of this optimal virtual noise level was found to be about 75%of the mean value of the near-zero amplitude of the signal.Consequently,the dynamic range of the system was improved by 11.26 dB compared with the traditional relative-intensity-ratio method,demonstrating that the adoption of the vir-tual noise level improved system performance by reducing the sensitivity of the near-zero amplitude.关键词
分布式光纤传感/光时域反射/振动监测/动态范围/虚拟噪声Key words
distributed optic fiber sensing/optical time domain reflectometry/vibration monitoring/dy-namic range/virtual noise分类
信息技术与安全科学引用本文复制引用
王子豪,冯玉祥,刘志凯,吕立冬..基于虚拟噪声电平的分布式光纤振动传感系统性能优化[J].光学精密工程,2025,33(12):1842-1852,11.基金项目
国家自然科学基金项目(No.51977001) （No.51977001）
