电子测量与仪器学报

尹康,王宇,李沛峰,苏玉文,白清,刘昕,靳宝全.基于随机数编码的相位敏感光时域反射仪[J].电子测量与仪器学报,2022,36(9):125-131

基于随机数编码的相位敏感光时域反射仪

Phase-sensitive OTDR based on random number coding

DOI：

英文关键词:optical fiber sensing Ф-OTDR sensing distance random number coding

基金项目:国家自然科学基金（62175175）、山西省基础研究计划（202103021222010）、山西省基础研究计划（20210302124599）、山西省重点研发计划（202102130501021）项目资助

作者	单位
尹康	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
王宇	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，2. 山西省交通科技研发有限公司
李沛峰	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
苏玉文	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
白清	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
刘昕	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
靳宝全	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

Author	Institution
Yin Kang	1. Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education and Shanxi Province, Taiyuan University of Technology
Wang Yu	1. Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education and Shanxi Province, Taiyuan University of Technology，2. Shanxi Transportation Technology Research & Development Co. , Ltd.
Li Peifeng	1. Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education and Shanxi Province, Taiyuan University of Technology
Su Yuwen	1. Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education and Shanxi Province, Taiyuan University of Technology
Bai Qing	1. Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education and Shanxi Province, Taiyuan University of Technology
Liu Xin	1. Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education and Shanxi Province, Taiyuan University of Technology
Jin Baoquan	1. Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education and Shanxi Province, Taiyuan University of Technology

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中文摘要:

相位敏感光时域反射仪(Ф-OTDR)的传感距离与空间分辨率相互制约,为进一步提升系统性能,提出了光脉冲随机数编码方法,分析了基于编码的相干探测 Ф-OTDR 的线性化理论,阐述了随机数编码与解码原理并推导了随机数编码的增益数学模型。实验证明,在 1 kHz 脉冲重复频率,与 40 ns 脉冲宽度的条件下,与单脉冲调制的 Ф-OTDR 相比,使用 128 bit 40 ns 脉冲宽度的随机数编码可将传感距离从 25 km 提升至 50. 26 km,且在接近尾端处还原的振动信号信噪比可达 17. 51 dB,能够较好还原振动信号。研究表明随机数编码方法为提升 Ф-OTDR 传感性能提供了有效的解决方案。

英文摘要:

The sensing distance and spatial resolution of phase-sensitive optical time domain reflectometer ( Ф-OTDR) are mutually restricted. In order to further improve the system performance, a random number coding method of optical pulse is proposed in this paper. The linearization theory analysis of the coherent detection Ф-OTDR based on coding and the principle of random number encoding and decoding are described, and the gain mathematical model of random number encoding is deduced. Experimental results show that compared with the single-pulse equivalent, the sensing distance can be increased from 25 km to 50. 26 km by using 128 bit random number code with 40 ns pulse width and 1 kHz pulse repetition frequency, and the signal to noise ratio can reach 17. 51 dB at 50. 22 km, where the vibration signal can be well restored. The research shows that the random number coding method provides an effective solution for improving the performance of Ф-OTDR.

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