Brillouin Optical Correlation Domain Analysis Enhanced by Time-Domain Data Processing for Concurrent Interrogation of Multiple Sensing Points

Ryu, Gukbeen; Kim, Gyu Tae; Song, Kwang Yong; Lee, Sang Bae; Lee, Kwanil

doi:10.1109/jlt.2017.2750174

Cited by 34 publications

(15 citation statements)

References 16 publications

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“…More advanced schemes have been demonstrated, in which the amplitude of the backscatter signal is measured in multiple locations simultaneously. These schemes include the use of a pulsed pump, to discriminate between multiple correlation peaks along the FUT [ 41 ], or multi-tone modulation of the laser light [ 42 ]. In the latter case, an electrical spectrum analyzer (ESA), locked at twice the modulation frequency, detects the Brillouin gain changes in the position corresponding to that modulation frequency.…”

Section: Dynamic Sensing Based On Bocdamentioning

confidence: 99%

Distributed Dynamic Strain Sensing Based on Brillouin Scattering in Optical Fibers

Coscetta

Minardo

Zeni

2020

Sensors

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Over the past three decades, extensive research activity on Brillouin scattering-based distributed optical fiber sensors has led to the availability of commercial instruments capable of measuring the static temperature/strain distribution over kilometer distances and with high spatial resolution, with applications typically covering structural and environmental monitoring. At the same time, the interest in dynamic measurements has rapidly grown due to the relevant number of applications which could benefit from this technology, including structural analysis for defect identification, vibration detection, railway traffic monitoring, shock events detection, and so on. In this paper, we present an overview of the recent advances in Brillouin-based distributed optical fiber sensors for dynamic sensing. The aspects of the Brillouin scattering process relevant in distributed dynamic measurements are analyzed, and the different techniques are compared in terms of performance and hardware complexity.

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Section: Dynamic Sensing Based On Bocdamentioning

confidence: 99%

Distributed Dynamic Strain Sensing Based on Brillouin Scattering in Optical Fibers

Coscetta

Minardo

Zeni

2020

Sensors

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“…This milestone result highlights the importance and potential of bringing together correlation-domain and time-domain analysis principles. It should be noted that similar pulse-amplitude modulation of the pump wave was also successfully introduced to frequency-modulation-based B-OCDA [44].…”

Section: The Overlay Of Pump Pulsesmentioning

confidence: 99%

Phase-Coded and Noise-Based Brillouin Optical Correlation-Domain Analysis

2018

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Correlation-domain analysis has enabled distributed measurements of Brillouin gain spectra along optical fibers with high spatial resolution, up to millimeter-scale. The method relies on the joint modulation of counter-propagating Brillouin pump and signal waves so that their complex envelopes are correlated in select positions only. Brillouin optical correlation-domain analysis was first proposed nearly 20 years ago based on frequency modulation of the two waves. This paper reviews two more recent variants of the concept. In the first, the Brillouin pump and signal waves are co-modulated by high-rate binary phase sequences. The scheme eliminates restricting trade-offs between the spatial resolution and the range of unambiguous measurements, and may also suppress noise due to residual Brillouin interactions outside the correlation peak. Sensor setups based on phase coding addressed 440,000 high-resolution points and showed potential for reaching over 2 million such points. The second approach relies on the amplified spontaneous emission of optical amplifiers, rather than the modulation of an optical carrier, as the source of Brillouin pump and signal waves. Noise-based correlation-domain analysis reaches sub-millimeter spatial resolution. The application of both techniques to tapered micro-fibers and planar waveguides is addressed as well.

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“…25 However, in the sine-FM and phase-coded systems, the scanning of periodic CPs is achieved by adjusting the frequency of sinusoidal signal or the rate of phase sequence. The CP width is slightly changed during the localization process, leading to the worsening in SR. 21,24 Consequently, the SR would gradually deteriorate by increasing the MR, which limits the further expansion of resolving points. 17 In addition, the modulation devices with higher bandwidth and several extrasignal generators are required, with the cost and complexity increasing inevitably.…”

Section: Introductionmentioning

confidence: 99%

Long-range chaotic Brillouin optical correlation domain analysis with more than one million resolving points

Wang

Niu

et al. 2023

Adv. Photon. Nexus

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.We propose and experimentally demonstrate a long-range chaotic Brillouin optical correlation domain analysis by employing an optimized time-gated scheme and differential denoising configuration, where the number of effective resolving points largely increases to more than one million. The deterioration of the chaotic Brillouin gain spectrum (BGS) and limitation of sensing range owing to the intrinsic noise structure, resulting from the time delay signature (TDS) and nonzero background of chaotic laser, is theoretically analyzed. The optimized time-gated scheme with a higher extinction ratio is used to eliminate the TDS-induced impact. The signal-to-background ratio of the measured BGS is enhanced by the differential denoising scheme to furthest remove the accumulated nonzero noise floor along the fiber, and the pure chaotic BGS is ulteriorly obtained by the Lorentz fit. Ultimately, distributed strain sensing along a 27.54-km fiber with a 2.69-cm spatial resolution is experimentally demonstrated, and the number of effective resolving points is more than 1,020,000.

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Brillouin Optical Correlation Domain Analysis Enhanced by Time-Domain Data Processing for Concurrent Interrogation of Multiple Sensing Points

Cited by 34 publications

References 16 publications

Distributed Dynamic Strain Sensing Based on Brillouin Scattering in Optical Fibers

Distributed Dynamic Strain Sensing Based on Brillouin Scattering in Optical Fibers

Phase-Coded and Noise-Based Brillouin Optical Correlation-Domain Analysis

Long-range chaotic Brillouin optical correlation domain analysis with more than one million resolving points

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