太赫兹技术在分布式光纤传感信息自动上传中的应用

Application of terahertz technology in automatic upload of distributed optical fiber sensing information

由于光纤传感数据采集量大,上传速率低,研究太赫兹技术在分布式光纤传感信息自动上传中的应用。分析光纤光弹效应,通过四阶应力的光学张量对其表示,考虑主力与主应变内在联系,确定光纤长度和相位变化间具有的正比关系;结合光弹效应,利用太赫兹辐射源光子能量与黑体温度低、能量衰减较小优势设计十字架型纤芯THz光纤;将双通道采集卡用于信息采集,为改善信号信噪比,使用线性累计法实现数据预处理;计算各节点间信道容量,确定最佳目标函数,构建分布式光纤传感信息自动上传模型。仿真结果表明,应用太赫兹技术能有效减少光纤损耗,当频带数量超过5时,曲线走势平缓,提高上传速率,最高可达298.31 Mb/s。

Due to the large amount of optical fiber sensor data acquisition and low upload rate,the application of terahertz technology in automatic uploading of distributed optical fiber sensing information is studied.The photo-elastic effect of optical fiber is analyzed.The fourth-order stress tensor is used to express it.Considering the internal relation-ship between main force and principal strain,the proportional relationship between fiber length and phase change is determined.Combined with photo-elastic effect,cross core THz fiber is designed by taking advantage of low photon energy and blackbody temperature and small energy attenuation of terahertz radiation source.The dual channel acquisi-tion card is used for information acquisition In order to improve the signal-to-noise ratio,the linear accumulation method is used to realize data preprocessing;the channel capacity between nodes is calculated to determine the optimal objective function,and the automatic upload model of distributed optical fiber sensing information is constructed.The simulation results show that terahertz technology can effectively reduce the fiber loss.When the number of frequency bands exceeds 5,the trend of the curve is smooth,and the upload rate can be increased up to 298.31 Mb/s.