A Quasi-Distributed Sensing Network With Time-Division-Multiplexed Fiber Bragg Gratings

Wang, Yunmiao; Gong, Jianghong; Wang, Dorothy Y.; Dong, Bo; Bi, Weihong; Wang, Anbo

doi:10.1109/lpt.2010.2089676

Cited by 149 publications

(66 citation statements)

References 8 publications

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“…For the TDM FBG array, the maximum number of interrogated FBGs is limited by two types of crosstalk, namely multiple-reflection crosstalk and spectral shadowing [7]. The multiple-reflection crosstalk refers to the spectral distortion induced by the false signal, which undergoes multiple reflections between the upstream FBGs and arrives at the detector at the same time with the real signal of downstream FBGs.…”

Section: Crosstalk Of Gratingsmentioning

confidence: 99%

“…The multiple-reflection crosstalk refers to the spectral distortion induced by the false signal, which undergoes multiple reflections between the upstream FBGs and arrives at the detector at the same time with the real signal of downstream FBGs. Related studies show that the multiple-reflection crosstalk can be ignored when the reflectivity of the FBG is less than 1% [7]. Spectral shadowing describes the spectral distortion of the downstream FBGs induced by the insertion loss of the upstream FBGs.…”

Section: Crosstalk Of Gratingsmentioning

confidence: 99%

“…However, for this normal FBG array, the multiplexing capacity is seriously limited by intrinsic crosstalk [6]. A newly developed optical time-domain reflectometry-FBG network with a weak FBG array has been reported [7,8]. Its interrogated system selects the tunable laser (T-LD) as the source and distinguishes FBGs by a high-speed data acquisition.…”

Section: Introductionmentioning

confidence: 99%

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An interrogation system based on two semiconductor optical amplifiers for weak fiber Bragg gratings

2014

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An interrogation system based on two semiconductor optical amplifiers for weak fiber Bragg gratings (FBGs) was proposed. The first semiconductor optical amplifier (SOA) was used to modulate the light, and the second SOA separated the reflected signal from the different FBGs through delayed switching. The proposed system has lower insertion loss and higher spatial resolution, and can interrogate the time-and wavelength-division multiplexed FBG array. Up to 50 FBGs, with a reflectivity of 0.2% and a spatial resolution of 5 m along the optical fiber, were distinguished to demonstrate the interrogation system.

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Section: Crosstalk Of Gratingsmentioning

confidence: 99%

Section: Crosstalk Of Gratingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An interrogation system based on two semiconductor optical amplifiers for weak fiber Bragg gratings

2014

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“…To overcome the limitations imposed by the cost and interrogation complexity of many point sensors, quasi-distributed sensing can be implemented based on array of FBGs employing different multiplexing techniques [7]. Among all multiplexing methods, time division multiplexing (TDM) is one of the most promising techniques since it makes efficient use of the optical spectrum, allowing for several FBG sensors to be employed in the same wavelength window and providing at the same time measurements with a good dynamic range [8].…”

Section: Introductionmentioning

confidence: 99%

Integrated hybrid Raman/fiber Bragg grating interrogation scheme for distributed temperature and point dynamic strain measurements

et al. 2012

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We propose and experimentally demonstrate the feasibility of an integrated hybrid optical fiber sensing interrogation technique that efficiently combines distributed Raman-based temperature sensing with fiber Bragg grating (FBG)-based dynamic strain measurements. The proposed sensing system is highly integrated, making use of a common optical source/receiver block and exploiting the advantages of both (distributed and point) sensing technologies simultaneously. A multimode fiber is used for distributed temperature sensing, and a pair of FBGs in each discrete sensing point, partially overlapped in the spectral domain, allows for temperature-independent discrete strain measurements. Experimental results report a dynamic strain resolution of 7.8 nε∕ p Hz within a full range of 1700 με and a distributed temperature resolution of 1°C at 20 km distance with 2.7 m spatial resolution.

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“…Over the last fifteen years, FBGs have been widely used for strain and temperature monitoring [5,6]. By integrating FBGs along the single mode fiber (SMF), quasi-distributed fiber sensing can be achieved [7,8]. However, the total number of FBGs is limited in these systems.…”

mentioning

confidence: 99%

An OTDR and Gratings Assisted Multifunctional Fiber Sensing System

et al. 2015

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Abstract-We report a distributed multifunction fiber sensing network based on weak-fiber Bragg gratings (WFBGs) and long period fiber grating (LPG) assisted OTDR system. The WFBGs are applied for temperature, strain and vibration monitoring at key-positions, and the LPG is used as a linear filter in the system to convert the wavelength shift of WFBGs caused by environmental change into the power change. The simulation results show that it is possible to integrate more than 4472 WFBGs in the system when the reflectivity of WFBGs is less than − . Besides, the reflected light of weak FBGs and the back-Rayleigh scattering along the whole fiber can also be detected which makes distributed bend sensing possible. As an experimental demonstration, we have used 3 WFBGs UV-inscribed with 50 m interval at the end of a 2.6 km long fiber, which part was subjected for temperature, strain and vibration sensing, respectively. The results show strain and temperature sensitivities are . × − / and . × − /℃, respectively. Detection of multiple vibrations and single vibration with the broad frequency band up to 500 Hz are also achieved. In addition, distributed bend sensing which could be simultaneously realized in this system has been proposed.

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A Quasi-Distributed Sensing Network With Time-Division-Multiplexed Fiber Bragg Gratings

Cited by 149 publications

References 8 publications

An interrogation system based on two semiconductor optical amplifiers for weak fiber Bragg gratings

An interrogation system based on two semiconductor optical amplifiers for weak fiber Bragg gratings

Integrated hybrid Raman/fiber Bragg grating interrogation scheme for distributed temperature and point dynamic strain measurements

An OTDR and Gratings Assisted Multifunctional Fiber Sensing System

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