Distributed Strain and Vibration Sensing System Based on Phase-Sensitive OTDR

Zhou, Lanping; Wang, F.; Wang, X.; Pan, Yun; Sun, Ziying; Jiang, Hua; Zhang, X.

doi:10.1109/lpt.2015.2444419

Cited by 91 publications

(49 citation statements)

References 13 publications

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“…By using the fast Fourier transform method to extract the frequency spectrum of the signals for each position of fiber as Ref. 18, the frequency for each position was obtained. The frequency spectrum along the sensing fiber is shown in Figs.…”

Section: Methodsmentioning

confidence: 99%

Phase sensitive distributed vibration sensing based on ultraweak fiber Bragg grating array using double-pulse

et al. 2017

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, "Phase sensitive distributed vibration sensing based on ultraweak fiber Bragg grating array using double-pulse," Opt. Abstract. A distributed vibration sensing technique using double-optical-pulse based on phase-sensitive optical time-domain reflectometry (Φ-OTDR) and an ultraweak fiber Bragg grating (UWFBG) array is proposed for the first time. The single-mode sensing fiber is integrated with the UWFBG array that has uniform spatial interval and ultraweak reflectivity. The relatively high reflectivity of the UWFBG, compared with the Rayleigh scattering, gains a high signal-to-noise ratio for the signal, which can make the system achieve the maximum detectable frequency limited by the round-trip time of the probe pulse in fiber. A corresponding experimental Φ-OTDR system with a 4.5 km sensing fiber integrated with the UWFBG array was setup for the evaluation of the system performance. Distributed vibration sensing is successfully realized with spatial resolution of 50 m. The sensing range of the vibration frequency can cover from 3 Hz to 9 kHz.

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Section: Methodsmentioning

confidence: 99%

Phase sensitive distributed vibration sensing based on ultraweak fiber Bragg grating array using double-pulse

et al. 2017

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“…In this time-domain implementation, the time of flight of the pulse in the fiber naturally correlates to the fiber position through the group velocity of the light in the fiber (z = ct/ 2n g ). Therefore, whenever an external perturbation modifies the refractive index or the distance between scattering centers at a certain spot in the fiber, the optical echo detected at its input end will be altered at the corresponding time delay in the trace [35,36].…”

Section: Fiber Optic Implementation Of a Hot-wire Anemometermentioning

confidence: 99%

Long-range distributed optical fiber hot-wire anemometer based on chirped-pulse ΦOTDR

et al. 2018

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Abstract:We demonstrate a technique allowing to develop a fully distributed optical fiber hot-wire anemometer capable of reaching a wind speed uncertainty of ≈ ±0.15 m/s (±0.54 km/h) at only 60 mW/m of dissipated power in the sensing fiber, and within only four minutes of measurement time. This corresponds to similar uncertainty values than previous papers on distributed optical fiber anemometry but requires two orders of magnitude smaller dissipated power and covers at least one order of magnitude longer distance. This breakthrough is possible thanks to the extreme temperature sensitivity and single-shot performance of chirped-pulse phase-sensitive optical time domain reflectometry (ΦOTDR), together with the availability of metal-coated fibers. To achieve these results, a modulated current is fed through the metal coating of the fiber, causing a modulated temperature variation of the fiber core due to Joule effect. The amplitude of this temperature modulation is strongly dependent on the wind speed at which the fiber is subject. Continuous monitoring of the temperature modulation along the fiber allows to determine the wind speed with singular low power injection requirements. Moreover, this procedure makes the system immune to temperature drifts of the fiber, potentially allowing for a simple field deployment. Being a much less power-hungry scheme, this method also allows for monitoring over much longer distances, in the orders of 10s of km. We expect that this system can have application in dynamic line rating and lateral wind monitoring in railway catenary wires.

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“…Its superior properties include high sensitivity, fast response speed, long sensing distance, etc. [1][2][3][4] Over the past decade, research efforts have been made to develop a series of techniques all towards improvement the performance of Φ-OTDR technology [5][6][7]. However, the very weak Rayleigh back scattering signal is fundamentally limiting the performance of all Φ-OTDR [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Interrogation of Ultra-Weak FBG Array Using Double-Pulse and Heterodyne Detection

Liu

Wang

Zhang

et al. 2018

IEEE Photon. Technol. Lett.

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A high performance interrogation method for ultra-weak FBG (UWFBG) using double-pulse and heterodyne detection method is proposed. The perturbation along the UWFBG array is located quickly through the use of double-pulsed optical input waveform. Then the perturbation of fiber is quantified precisely by demodulating the phase of differential signals from a heterodyne configuration. The efficiency of measuring the perturbation is improved by more than 20 times than that of using single probe pulse. In comparison with conventional Rayleigh scattering based approach, the proposed method is supreme in signal-to-noise ratio (SNR), approximately 18 dB higher. The use of differential signaling method can effectively remove the influence from frequency drift of the laser source, making this proposed method capable of measuring low frequency vibration. In our experiment, perturbations with both sinusoidal and triangle waveform were generated to quantitatively evaluate the performance of the proposed method. The minimum detectable fiber length variation is 14.85 nm, and the sensing frequency can be as low as 0.2 Hz.

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Distributed Strain and Vibration Sensing System Based on Phase-Sensitive OTDR

Cited by 91 publications

References 13 publications

Phase sensitive distributed vibration sensing based on ultraweak fiber Bragg grating array using double-pulse

Phase sensitive distributed vibration sensing based on ultraweak fiber Bragg grating array using double-pulse

Long-range distributed optical fiber hot-wire anemometer based on chirped-pulse ΦOTDR

Interrogation of Ultra-Weak FBG Array Using Double-Pulse and Heterodyne Detection

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