Mr. Zhuoda Li Profile

Zhuoda Li

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Proceedings Article | 5 December 2024 Paper

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

Proceedings Volume 13418, 134183T (2024) https://doi.org/10.1117/12.3048776

KEYWORDS: Temperature distribution, Sensing systems, Optical fibers, Thermal stability

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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.

Proceedings Article | 24 November 2023 Paper

A sapphire fiber Bragg grating strain sensor operating in high temperature environment

Zhuoda Li, Jun He, Xizhen Xu, Jia He, Jiafeng Wu, Yiping Wang

Proceedings Volume 12935, 129354X (2023) https://doi.org/10.1117/12.3008137

KEYWORDS: Sapphire, Femtosecond phenomena, Sensors, Fiber Bragg gratings, Optical fibers, Bragg gratings

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In situ strain sensing at high-temperature environment is crucial in the aerospace field. Silica fibers will soften at 700 ℃, which can hardly be utilized for strain sensing at higher temperatures. Notably, single crystal sapphire fiber is a promising material for high-temperature sensing due to the high melting point (~2045 ℃). Here, we report the strain sensing at 800 ℃ of sapphire fiber Bragg gratings (SFBG) inscribed by a femtosecond laser lineby- line scanning technique. At first, a line-by-line sapphire fiber grating was inscribed using femtosecond laser direct writing technique. The sapphire fiber ends were polished into bevels to reduce Fresnel reflections, and the signal-to-noise ratio of the SFBG was improved from 9 dB to 17.2 dB. And then, strain characteristics of the SFBG were investigated at room temperature. It was found that the maximum strain of SFBG was decreased to 3600 με (64% reduction) comparing with 9714 με of the pristine sapphire fiber, which is due to the micro-damage introduced by femtosecond laser pulses. In addition, the strain sensitivity of the SFBG is 1.42 pm/με. Subsequently, a strain sensing experiment of the SFBG was carried out at 1100 ℃ using a high-temperature tensile testing system. After annealing at 1100 ℃ for 4 h to improve the high-temperature stability, the SFBG exhibited a strain sensitivity of 1.6 pm/με (R²=0.998) at 1100 ℃. As a result, strain sensing at 1100 ℃ environment was realized based on the SFBG, which indicates a promising application in the aerospace field, especially in strain sensing for structural safety monitoring of hypersonic aircraft at high-temperature.

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