Quadratic Peak-Seeking Algorithm to Improve The Frequency Shift Positioning Accuracy of Brillouin Optical Time Domain Reflectometer

Yingkai Chen; Liping Chen; Yonghong Zheng; Bo Gao; Yongzheng Li; Linlin Fu; Xinyu Liu; Dingyi Ma; Haoran Gao; Qiuming Huang; Linfeng Guo; Xiaomin Xu

doi:10.3788/LOP231978

Laser & Optoelectronics Progress, Volume. 61, Issue 15, 1512003(2024)

Quadratic Peak-Seeking Algorithm to Improve The Frequency Shift Positioning Accuracy of Brillouin Optical Time Domain Reflectometer

Yingkai Chen¹, Liping Chen², Yonghong Zheng³, Bo Gao⁴, Yongzheng Li^3、***, Linlin Fu⁵, Xinyu Liu¹, Dingyi Ma¹, Haoran Gao¹, Qiuming Huang¹, Linfeng Guo^1,6、*, and Xiaomin Xu^7、**

Author Affiliations

¹School of Physics and Optoelectronic Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, Jiangsu, China

²China Railway (Shanghai) Investment Group Co., Ltd., Shanghai 200126, China

³China Railway No.3 Group East China Construction Co., Ltd., Nanjing 211153, Jiangsu, China

⁴Nanjing Metro Construction Co., Ltd., Nanjing 210019, Jiangsu, China

⁵China Railway Tunnel Group No.2 Co., Ltd., Langfang 065200, Hebei, China

⁶Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, Nanjing 210044, Jiangsu, China

⁷Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, United Kingdom

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Figures & Tables(12)

Fig. 1. Superposition of Brillouin signals in different situations (a) No temperature/strain change; (b) temperature/strain change occurs

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Fig. 2. Ideal Brillouin gain spectrum major and secondary peak intensity trend plot

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Fig. 3. Schematic diagram of data segmentation principle

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Fig. 4. Schematic diagram of BOTDR system based on quadratic peaking-seeking algorithm

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Fig. 5. Quadratic peak-finding algorithm BOTDR experimental system

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Fig. 6. Temperature test configuration on sensing fiber

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Fig. 7. BFS, using a quadratic peak-seeking algorithm before adjustment

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Fig. 8. BFS, using peak-seeking algorithm

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Fig. 9. BFS, using an adjusted quadratic peak-seeking algorithm

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Fig. 10. Temperature testing configuration for verifying spatial resolution

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Fig. 11. Brillouin shift distribution from 1900 m to 1980 m

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Table 1. Comparison of the effect of the peak-finding algorithm and the quadratic peak-finding algorithm
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Table 1. Comparison of the effect of the peak-finding algorithm and the quadratic peak-finding algorithm
Algorithm Positioning offset /m Spatial resolution /m Execution time /s
Peak seeking 5 10 144
Quadratic peak seeking 0.4 1 147

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Yingkai Chen, Liping Chen, Yonghong Zheng, Bo Gao, Yongzheng Li, Linlin Fu, Xinyu Liu, Dingyi Ma, Haoran Gao, Qiuming Huang, Linfeng Guo, Xiaomin Xu. Quadratic Peak-Seeking Algorithm to Improve The Frequency Shift Positioning Accuracy of Brillouin Optical Time Domain Reflectometer[J]. Laser & Optoelectronics Progress, 2024, 61(15): 1512003

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