Development of fully-distributed fiber sensors based on Brillouin scattering

Zhang, Xuping; Lu, Y.; Wang, Feng; Liang, Hao; Zhang, Yixin

doi:10.1007/s13320-010-0019-7

Cited by 24 publications

(12 citation statements)

References 15 publications

(18 reference statements)

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“…3. Instead of the polarization scrambling method, the polarization diversity method is used to ensure the RS signal to keep the polarization state of probe pulse stable in a relatively long time [6,7]. After N·T (T is the period of the light pulse, and N is the number of the light), the polarization of the local oscillator (LO) light is switched to polarization orthogonally to eliminate the polarization related gain of BS light by averaging the BS signal of the two LO polarizations.…”

Section: Synchronization Principle In the Demodulationmentioning

confidence: 99%

A hybrid Φ/B-OTDR for simultaneous vibration and strain measurement

Peng

Cao

2016

Photonic Sens

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A hybrid phase-sensitive optical time domain reflectometry (Φ-OTDR) and Brillouin optical time domain reflectometry (B-OTDR) system which can realize simultaneous measurement of both dynamic vibration and static strain is proposed. Because the Rayleigh scattering light and spontaneous Brilliouin scattering light are naturally frequency-multiplexed, the heterodyne asynchronous demodulation of frequency shift keying (FSK) in optical fiber communications is utilized, and the demodulations of the two scattering signals are synchronized. In addition, the forward Raman amplification is introduced to the system, which not only makes up for the deficiency of spontaneous Brilliouin scattering based distributed fiber sensor, but also has the merit of the single end measurement of B-OTDR. The designed Φ/B-OTDR hybrid system has the sensing range of 49 km with 10 m spatial resolution. The vibration and strain experiments show that this hybrid system has great potential for use in long-distance structural health monitoring.

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Section: Synchronization Principle In the Demodulationmentioning

confidence: 99%

A hybrid Φ/B-OTDR for simultaneous vibration and strain measurement

Peng

Cao

2016

Photonic Sens

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“…The Brillouin frequency domain analysis (BOFDA) is a new technology for temperature and strain measurement. Using this type of distributed sensing technology, the parameters can be measured as a function of the length optical fiber sensor [1][2][3][4][5][6][7][8]. The strain and temperature distribution information of the entire optical fiber can be continuously measured and real-time display by BOFDA technology.…”

Section: Journal Of Sensorsmentioning

confidence: 99%

Distributed Measurement of Temperature for PCC Energy Pile Using BOFDA

Gao

Kong

et al. 2015

Journal of Sensors

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PCC energy pile is a new technology for sustainable development of urban areas. Learning and understanding the temperature variation of PCC energy pile are very important to its development and application. In this study, the Brillouin optical frequency domain analysis (BOFDA) technology is firstly used to measure the temperature variation of PCC energy pile from a model test. The aim is to provide an optical fiber sensing method for monitoring the temperature distribution of PCC energy pile. When the temperatures of circulating water are 70°C, 60°C, 50°C, and 40°C, the result shows that the temperatures of PCC energy pile under different conditions are measured well by the optical fiber sensor. It will help to master the temperature distribution and thermomechanical characteristic of PCC energy pile. It can also provide the important scientific and theoretical basis for the design and application of PCC energy pile.

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“…If the pump power is above the nonlinear threshold, it will result in a depletion of the pump power and invoke unwanted nonlinear effects, hence reduce the sensing range and the accuracy of strain and temperature measurements [9]. On the other hand, if the LO signal power is strong enough, the SNR is no longer dependent on the LO signal power [10]. Several techniques have been proposed to improve the SNR of the BOTDR system, such as employing multiple longitudinal modes of Fabry-Perot laser [11], Raman amplification [12,13] and pulse coding [14] can improve the SNR significantly with a simple implementation.…”

Section: Introductionmentioning

confidence: 99%

Performance Improvement of Brillouin Ring Laser Based BOTDR System Employing a Wavelength Diversity Technique

Lalam

Dai

et al. 2018

J. Lightwave Technol.

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This document may differ from the final, published version of the research and has been made available online in accordance with publisher policies. To read and/or cite from the published version of the research, please visit the publisher's website (a subscription may be required.) 1 Considering the input pump power limitation and the complexity of the receiver bandwidth reduction, a novel wavelength diversity technique is employed together with a BRL in a conventional BOTDR system. The proposed system Abstract-In this paper, a wavelength diversity technique is employed in a Brillouin optical time domain reflectometry (BOTDR) using a Brillouin ring laser (BRL) as a local oscillator. In the wavelength diversity technique, multiple wavelengths are injected into the sensing fiber, while the peak power of each wavelength is set below the nonlinear threshold level. This technique significantly maximizes the overall launch pump power, without activating the non-negligible nonlinear effects, which overcomes the limitation of the conventional BOTDR system. The BRL, which is simple and cost-effective, that can be used to reduce the receiver bandwidth in the order of few MHz. In addition, a passive depolarizer is used to reduce the polarization noise. The proposed system is validated experimentally over a 50 km sensing fiber with a 5 m spatial resolution. The experimental results demonstrate a signal-to-noise ratio improvement of 5.1 dB, which corresponds to 180% improvement compared to a conventional BOTDR system. Index Terms-Wavelength diversity, distributed fibre sensors, Brillouin scattering.

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Development of fully-distributed fiber sensors based on Brillouin scattering

Cited by 24 publications

References 15 publications

A hybrid Φ/B-OTDR for simultaneous vibration and strain measurement

A hybrid Φ/B-OTDR for simultaneous vibration and strain measurement

Distributed Measurement of Temperature for PCC Energy Pile Using BOFDA

Performance Improvement of Brillouin Ring Laser Based BOTDR System Employing a Wavelength Diversity Technique

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