Paper
5 December 2024 A non-local means algorithm-based Raman-OTDR for high-performance distributed temperature sensing
Ziheng Yan, Jun He, Bin Du, Xizhen Xu, Baijie Xu, Zhuoda Li, Yiping Wang
Author Affiliations +
Proceedings Volume 13418, Fifteenth International Conference on Information Optics and Photonics (CIOP 2024); 134183T (2024) https://doi.org/10.1117/12.3048776
Event: 15th International Conference on Information Optics and Photonics (CIOP2024), 2024, Xi’an, China
Abstract
Raman-Optical-Time-Domain-Reflectometry (R-OTDR) based Distributed Temperature Sensing (DTS) is of great significance in extremely harsh environment. In this work, we propose a Non-Local Means (NLM) algorithm for R-OTDR performance improvement without modifying the hardware architecture. The NLM algorithm real-time reconstruct the two-dimensional temperature image by utilizing a first-in-first-out data transmission protocol. These images are incorporated to mitigate the complexity of calculating Euclidean distances between neighborhoods within two-dimensional spatial-temporal domains. This approach significantly improves the response speed of the system. To verify the sensing performance improvement of the NLM, we built a standard R-OTDR system and affirm the seamless continuity of temperature variations spanning a broad range from 40 °C to 80 °C over an extensive distance of 9.68 km assisted by a standard platinum resistor. The temperature accuracy decreases from 1.4 °C to 0.55 °C at sensing temperature of 100 °C. The results effectively reconcile the conventional trade-off between high temperature resolution and high-speed response. What’s more, an average temperature resolution is 0.05 °C at the end of fiber. In all, the Raman DTS system based on NLM algorithm achieve high temperature resolution. This achievement holds immense potential for diverse applications, including dynamic monitoring in the realms of energy development, oil and gas exploration, allied fields, and so on.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
Ziheng Yan, Jun He, Bin Du, Xizhen Xu, Baijie Xu, Zhuoda Li, and Yiping Wang "A non-local means algorithm-based Raman-OTDR for high-performance distributed temperature sensing", Proc. SPIE 13418, Fifteenth International Conference on Information Optics and Photonics (CIOP 2024), 134183T (5 December 2024); https://doi.org/10.1117/12.3048776
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KEYWORDS
Temperature distribution

Sensing systems

Optical fibers

Thermal stability

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