The effect of pulse duration on the Brillouin frequency shift accuracy in the differential cross-spectrum BOTDR (DCS-BOTDR) fiber sensor

Zan, Mohd Saiful Dzulkefly; Almoosa, Ahmed Sabri Kadhim; Ibrahim, Mohd Faisal; Elgaud, Mohamed M.; Hamzah, Abdulwahhab Essa; Arsad, Norhana; Mokhtar, Mohd Hadri Hafiz; Bakar, Ahmad Ashrif A

doi:10.1016/j.yofte.2022.102977

Cited by 12 publications

(3 citation statements)

References 19 publications

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“…Further research on the performance of the DCS-BOTDR system has been carried out recently. Zan et al compared the effect of different pulse duration on the performance of the DCS-BOTDR system and found that when T L = 14 and 22 ns the system can achieve a better BFS resolution [45].…”

Section: Differential Cross Spectrum Botdrmentioning

confidence: 99%

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Probe pulse design in Brillouin optical time‐domain reflectometry

Wang

et al. 2022

IET Optoelectronics

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Brillouin optical time‐domain reflectometry (BOTDR) is a branch of distributed fibre‐optic sensors, and it can measure the strain and the temperature information, localised by the return time of the probe pulse, along the fibre based on the spontaneous Brillouin scattering process. Parameters of the BOTDR system, including the spatial resolution, the signal‐to‐noise ratio, the measurement speed, and the sensing range, have a mutually restrictive relationship. In order to improve the performance of the BOTDR system, researchers have focussed on improving the design of the probe pulse, for example, transforming the shape, the sequence, and the spectral properties of the pulse. This study summarises the recent progress in the design of detection pulses in BOTDR systems, and comprehensively demonstrates the improvement effects of various pulse modulation formats on the system performance.

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Section: Differential Cross Spectrum Botdrmentioning

confidence: 99%

“…Zan et al. compared the effect of different pulse duration on the performance of the DCS‐BOTDR system and found that when T L = 14 and 22 ns the system can achieve a better BFS resolution [45].…”

Section: Single Probe Pulse Modulationmentioning

confidence: 99%

Probe pulse design in Brillouin optical time‐domain reflectometry

Wang

et al. 2022

IET Optoelectronics

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“…If it is necessary to obtain information about each point of the sensor, it is advisable to use distributed fiberoptic sensors [7][8][9][10]. They can be based on Rayleigh [11], Raman [12], or Brillouin [13][14][15] scattering. The intensity of Rayleigh scattering in an optical fiber weakly depends on the impact applied; therefore, special methods of radiation phase extraction are used to obtain information about temperatures and strains [16].…”

Section: Introductionmentioning

confidence: 99%

A Refinement of Backward Correlation Technique for Precise Brillouin Frequency Shift Extraction

Barkov

Krivosheev

Konstantinov

et al. 2023

Fibers

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A new method for extracting the Brillouin frequency shift (BFS) from the Brillouin gain spectrum (BGS), the modified backward correlation method (MBWC), is presented. The possibilities of using MBWC, and MBWC in combination with the Lorentzian curve fitting (LCF) based on Levenberg–Marquardt (LM) method, are studied. The effectiveness of the new method, and its combination with LM, has been demonstrated for processing spectra with a low signal-to-noise ratio (SNR). The experiments, which were in good agreement with the performed simulation, showed that at SNR = 0 dB, the combined (MBWC + LM) method provided the BFS extraction error of less than 4 MHz, while the state-of-the-art LM algorithm extracted it with the error greater than 4.5 MHz. The advantage of correlation methods becomes more significant with the decreasing SNR: at SNR = −2 dB, the LM’s error is 14.3 MHz, and that of the combined one is 8.1 MHz.

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