Brillouin Frequency Estimation in Distributed Brillouin Optical Fiber Sensors Based on Instantaneous Frequency

Li，Wei1; Jiang，Lin1; Zhang，Tianfang1; Cheng，Linghao1; Liang，Hao1; Zhou，Liming1; Liu，Weimin1; Shao，Liyang2; Guan，Bai Ou1

2022

10.1109/JSEN.2022.3200989

IEEE SENSORS JOURNAL   Impact Factor & Quartile

1530-437X

1558-1748

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.

Brillouin scattering Damping Distributed optical fiber sensors Fitting Frequency estimation Instantaneous frequency Oscillators Scattering Time-domain analysis Time-domain analysis Time-frequency analysis

SCI

English

Others

National Natural Science Foundation of China (NSFC)["61875246","62075086"]

Engineering ; Instruments & Instrumentation ; Physics

Engineering, Electrical & Electronic ; Instruments & Instrumentation ; Physics, Applied

WOS:000862372900036

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

ENGINEERING

2-s2.0-85137876426

Scopus

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.