分布式光纤传感器的编码技术研究  

Coding Technique for Distributed Fiber Sensors

作　　者：林全聪 程凌浩 吕杰 张天放 梁浩 关柏鸥 Lin Quancong;Cheng Linghao;Lu Jie;Zhang Tianfang;Liang Hao;Guan Baiou Guangdong(Key Laboratory of Fiber Sensing and Communication Technology,Institute of Photonics Technology,Jinan University,Guangzhou 510632,Guangdong,China)

机构地区：[1]暨南大学光子技术研究院广东省光纤传感与通信技术重点实验室,广东广州510632

出　　处：《光学学报》2024年第1期255-270,共16页Acta Optica Sinica

基　　金：国家自然科学基金(62075086)。

摘　　要：基于光纤中的瑞利、布里渊、拉曼等散射效应以及弱反射阵列的分布式光纤传感(DOFS)能够对光纤损耗、温度、应变、振动、声音等多种参量实现长距离、高空间分辨率的实时监测,受到了越来越多的关注,具有非常广阔的应用。在DOFS中使用编码脉冲序列增加DOFS的信号能量,是提高传感性能的一个重要技术途径。因此,编码技术的应用一直是DOFS研究的一个重要领域。综述了DOFS中编码技术的研究进展,阐述了编码技术提高传感性能的技术原理,归纳了不同编码方案的设计和实现方法,分析了不同类型DOFS的技术特征及其相应的编码技术应用方法。最后,对DOFS中的编码技术的发展进行了展望。Significance Based on Rayleigh,Brillouin,and Raman scattering,and weak reflection arrays in optical fiber,distributed optical fiber sensors(DOFSs)can achieve real-time monitoring with long range and high spatial resolution for multiple parameters such as optical fiber loss,temperature,strain,vibration,and sound.As a result,DOFSs catch more and more attention.The received signals from the sensing fiber of a DOFS are normally very weak and thus the received signal-to-noise ratio(SNR)is quite small.Although the SNR can be enhanced by increasing the optical pulse power launched into the sensing fiber,it is generally limited by fiber nonlinearity and then is upperbounded.A pulse with long duration can also be employed to improve the SNR but the spatial resolution is sacrificed.A better alternative to enhance the SNR without spatial resolution loss is to adopt an optical pulse sequence with some coding at a fairly low power to avoid fiber nonlinearity.Therefore,it has become an essential technique to enhance the performance of a DOFS by a long coded pulse train in DOFS.As technical characteristics of various DOFSs are different,applicable coding scheme has to be carefully designed for a particular DOFS.Design considerations may include several aspects such as code sequence,modulation format,detection scheme,and decoding methods.Hence,it is important and necessary to summarize the existing research on DOFS coding techniques for performance enhancement to guide the future development of this field.Progress In principle,the response of a DOFS with coding can be considered as the convolution of the coding sequence with the impulse response of the sensing fiber.The aperiodic autocorrelation of the coding sequence is utilized to construct an impulse function,and the impulse response of the sensing fiber can be recovered by correlating the DOFS response with the coding sequence itself at the receiver site.Therefore,the aperiodic autocorrelation characteristics of the coding sequence are critical,which can be evaluated from th

关 键 词：传感器 分布式光纤传感器 编码技术 光纤瑞利传感器 光纤布里渊传感器 光纤拉曼传感器 光纤弱光栅阵列传感器 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]