Brillouin Frequency Estimation in Distributed Brillouin Optical Fiber Sensors Based on Instantaneous Frequency
Short-time Fourier transform (STFT) algorithm with Lorentzian fitting is popular in distributed Brillouin optical fiber sensors to acquire Brillouin frequency. However, STFT often suffers from the trade-off between Brillouin frequency measurement resolution and computation complexity. To lower the complexity of Brillouin frequency analysis and speedup measurement, a novel method based on instantaneous frequency (IF) analysis is proposed. The instantaneous Brillouin frequency can be obtained through the instantaneous phase change between two adjacent samples in time domain. The requirement on spectral resolution is therefore greatly relaxed, significantly reducing computation complexity and lowering measurement time cost. A Brillouin optical time-domain reflectometry (BOTDR) scheme is demonstrated with a spatial resolution of 1.2 m over 5 km sensing fiber. For an average count of 4096 over measurements, experiments show that IF algorithm can reduce computation complexity by 122 times at a standard deviation (STD) of 0.5065MHz for BFS estimation which is comparable to the standard deviation obtained through STFT in conjunction with Lorentzian fitting.
National Natural Science Foundation of China (NSFC)["61875246","62075086"]
|WOS Research Area|
Engineering ; Instruments & Instrumentation ; Physics
Engineering, Electrical & Electronic ; Instruments & Instrumentation ; Physics, Applied
|WOS Accession No|
|ESI Research Field|
Cited Times [WOS]:2
|Document Type||Journal Article|
|Department||Department of Electrical and Electronic Engineering|
1.Institute of Photonics Technology, Jinan University, Guangzhou, China
2.Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, China
Li，Wei,Jiang，Lin,Zhang，Tianfang,et al. Brillouin Frequency Estimation in Distributed Brillouin Optical Fiber Sensors Based on Instantaneous Frequency[J]. IEEE SENSORS JOURNAL,2022,22(19):18501-18507.
Li，Wei.,Jiang，Lin.,Zhang，Tianfang.,Cheng，Linghao.,Liang，Hao.,...&Guan，Bai Ou.(2022).Brillouin Frequency Estimation in Distributed Brillouin Optical Fiber Sensors Based on Instantaneous Frequency.IEEE SENSORS JOURNAL,22(19),18501-18507.
Li，Wei,et al."Brillouin Frequency Estimation in Distributed Brillouin Optical Fiber Sensors Based on Instantaneous Frequency".IEEE SENSORS JOURNAL 22.19(2022):18501-18507.
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