Frequency shift estimation technique near the hotspot in BOTDA sensor

Sun, Xizi; Hong, Xiaobin; Wang, Sheng; Gao, Xia; Guo, Hongxiang; Li, Yan; Qiu, Jifang; Wu, Jian

doi:10.1364/oe.27.012899

Cited by 11 publications

(4 citation statements)

References 14 publications

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“…f B (z) and f B2 can be obtained based on the Brillouin spectrum, and the methods include the crosscorrelation algorithm [6], the fitting algorithm [7], the neural network algorithm [8], and the higherorder moment centroid calculation method [9]. Considering the high accuracy of the fitting method, the fitting method with a pseudo-Voigt profile is adopted to obtain f B (z) and f B2 .…”

Section: Measurement Of Optical Fiber Strain Using Bodtrmentioning

confidence: 99%

Strain Monitoring of Overhead Transmission Line Based on Brillouin Scattering

Ouyang

Zou

Chen

et al. 2023

J. Phys.: Conf. Ser.

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The change in the optical fiber state and the status of transmission line often leads to the change of strain in its composite optical fiber. This paper attempts to use a commercial BOTDR (Brillouin optical time-domain reflectometry) to monitor the strain of optical fiber composited in transmission line. The Brillouin spectra of typical optical fiber used in the transmission line are measured by a commercial BOTDR at room temperature, the spectra are fitted and the key parameters are calculated, and then the strain along whole optical fiber is obtained by demodulation. The results show that BOTDR can effectively monitor the optical fiber strain, and the mean standard deviation of strain measured for multiple measurements under the same condition is only about 8 με, which can stastify the requirements of practical cases. The work of this paper lays a foundation for the strain measurement of transmission line.

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Section: Measurement Of Optical Fiber Strain Using Bodtrmentioning

confidence: 99%

Strain Monitoring of Overhead Transmission Line Based on Brillouin Scattering

Ouyang

Zou

Chen

et al. 2023

J. Phys.: Conf. Ser.

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“…These methods solve the problem of BFS extraction when BFS difference of the uniform section is large enough and the multiple peaks can be distinguished apparently. Sun et al 12 proposed a fitting method considering the combined contributions of stressed and unstressed segments to recover the distorted BGS. However, fitting approaches require an iterative procedure that may involve too long processing time and it is difficult to meet the real-time requirements.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Extraction of double-peak Brillouin frequency shift based on ANN for nonuniform strain within BOTDR spatial resolution

Song,

Cui,

Jia

2024

Opt. Eng.

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.For practical engineering applications, Brillouin optical time domain reflectometry (BOTDR)’s double-peak Brillouin gain spectrum (BGS) can be measured when the strain is not uniform within spatial resolution. This double-peak BGS will affect the extraction accuracy of Brillouin frequency shift (BFS) and the following disaster monitoring. A detection method based on artificial neural network (ANN) is proposed for the double-peak BFS extraction. The ANN model is trained to deal with multi-parameters cases, including different frequency ranges, signal-to-noise-ratios, spectral widths, etc. The retraining of ANN model for different single-mode optical-fibers is not necessary. After training, the ANN model successfully detects the double-peak BFS from both the simulated and experimental data. The ANN model based BOTDR system is applied to the urban safety monitoring of underground pipe gallery. Under 5 m spatial resolution, 20 cm strained fiber can be detected, and the standard deviation of BFS can be as low as 1 MHz in experiment.

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“…Soto 7 et al proposed a revolutionary approach which utilizes image and video processing to improve signal-to-noise ratio. A fitting technique 8 is also proposed that considers the combined contributions of hotspot and ambient segment to recover the distorted BGS near the hotspot and evaluate BFS. In an effort to decrease the computational complexity of the estimation process a method was proposed that combines moving average filtering and cross correlation to improve the performance of the system utilizing field programmable gate arrays.…”

Section: Introductionmentioning

confidence: 99%

A method of fitting BOTDA data for the estimation of the Brillouin frequency shift

Komodromos

Polycarpou

Ioannou³

et al. 2023

Optical Sensors 2023

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A Brillouin Optical Time-Domain Analysis (BOTDA) Lorentzian data fitting method to estimate the Brillouin Frequency Shift (BFS) is proposed. Data is obtained from an experimental setup used to conduct the temperature and strain measurements. Before Lorentzian fitting the noisy data is averaged and filtered. The proposed method attempts to lower computational complexity in determining the Brillouin frequency. The resulting parameters of a completed BGS curve fitting are used as initial set of parameters for the next location point BGS fitting. Completion of the Lorentzian fitting using the Levenberg-Marquardt nonlinear curve fitting algorithm is achieved in a small number of iterations which improves the performance in obtaining the Brillouin frequency shift.

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Frequency shift estimation technique near the hotspot in BOTDA sensor

Cited by 11 publications

References 14 publications

Strain Monitoring of Overhead Transmission Line Based on Brillouin Scattering

Strain Monitoring of Overhead Transmission Line Based on Brillouin Scattering

Extraction of double-peak Brillouin frequency shift based on ANN for nonuniform strain within BOTDR spatial resolution

A method of fitting BOTDA data for the estimation of the Brillouin frequency shift

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