Crosstalk and Ghost Gratings in a Large-Scale Weak Fiber Bragg Grating Array

Guo, Huiyong; Li, Qian; Zhou, Ciming; Zheng, Zhou; Yuan, Yinquan; Xu, R. X.; Jiang, Desheng

doi:10.1109/jlt.2016.2639324

Cited by 20 publications

(15 citation statements)

References 10 publications

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“…As the DPSS-FBG sensors are intended to be overlapping in the spectrum, the captured frequency response of the system contains the aggregate of all the individual contributions in the network. The demodulation principle for this experiment consists on the correlation between the measured frequency response of the entire network and the individual frequency response of each sensor deployed in the network (6). Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, the bi-evaluated response for a determinate sensor changes for different values of the modulation frequency Ω. To obtain the central wavelength of each sensor (λ B k ), it is performed the correlation product CP k between the total frequency response of the sensing network H(Ω, ω), and the bi-evaluated frequency response of the k-th DPSS-FBG sensor in the network, this can be written as (6). Figure 6.…”

Section: B Demodulationmentioning

confidence: 99%

“…Time Domain Multiplexing (TDM) has been widely used as an alternative to this problem [3] but, in general, it compromises the acquisition rate of the system and demands high speed switching circuits, recent approaches use weak FBGs to achieve large-scale sensing systems. Weak FBG sensors should be interrogated either with TDM [4] or frequency shifted interferometry [5] approaches exhibit crosstalk limitations due to the shadowing effect between near-identical FBGs [6]. Nowadays, tailored FBG sensors can be manufactured in a routine way.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Code Division Multiplexing Applied to FBG Sensing Networks: FBG Sensors Designed as Discrete Prolate Spheroidal Sequences (DPSS-FBG Sensors)

Triana

Pastor

Varón

2017

J. Lightwave Technol.

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Abstract-We propose and demonstrate a sensing system with fiber Bragg grating (FBG) sensors designed as Discrete Prolate Spheroidal Sequences (DPSS). In this way, we can encode all of the sensing devices in the network making sure that each sensor is completely distinguishable from each other even under overlapping conditions. Since these devices are complex structures involving unique magnitude and phase response, the demodulation method should be able to recover the associated magnitude and phase response in order to identify each device in the sensing network. To do so, we use a Single Side Band (SSB) modulated optical source sweeping over the operational wavelength range of the sensors, the reflected signal from the sensors is sent to a Vector Network Analyzer (VNA) in which it is obtained the magnitude and phase ratio of the network in the microwave domain. Experimental demonstration has been carried out including the manufacturing of DPSS structures. Feasibility of the interrogation technique for devices involving magnitude and phase distinction has been validated, not only to identify encoded sensors in a measurement network but also to allow overlapping between them, which allow to increase the number of sensors allocated in the sensing network.

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Section: Methodsmentioning

confidence: 99%

Section: B Demodulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Code Division Multiplexing Applied to FBG Sensing Networks: FBG Sensors Designed as Discrete Prolate Spheroidal Sequences (DPSS-FBG Sensors)

Triana

Pastor

Varón

2017

J. Lightwave Technol.

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“…Jiang etc. at Wuhan University of Technology developed large-scale FBG arrays made with in-line FBG fabrication, and obtained the reflection spectra of an ultra-weak FBG array with near-identical 3010 FBGs, using a wavelength scanning time division multiplexing scheme [51].…”

Section: (Quasi) Distributed Optical Fiber Sensing Technologymentioning

confidence: 99%

Fiber optic sensing technologies potentially applicable for hypersonic wind tunnel harsh environments

2020

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Advanced sensing techniques are in big demand for applications in hypersonic wind tunnel harsh environments, such as aero(thermo)dynamics measurements, thermal protection of aircraft structures, air-breathing propulsion, light-weighted and highstrength materials, etc. In comparison with traditional electromechanical or electronic sensors, the fiber optic sensors have relatively high potential to work in hypersonic wind tunnel, due to the capability of responding to a wide variety of parameters, high resolution, miniature size, high resistant to electromagnetic and radio frequency interferences, and multiplexing, and so on. This article has classified and summarized the research status and the representative achievement on the fiber optic sensing technologies, giving special attention to the summary of research status on the popular Fabry-Perot interferometric, fiber Bragg gratings and (quasi) distributed fiber optic sensors working in hypersonic wind tunnel environment, and discussed the current problems in special optical fiber sensing technologies. This article would be regarded as reference for the researchers in hypersonic wind tunnel experiment field.

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“…With the model-based approach, a more efficient processing is possible and electrical bandwidth and measurement time can be saved. Furthermore, a powerful transfer matrix model (TMM) will be introduced, considering multiple reflections and spectral shadowing effects, which cause crosstalk errors in FBG arrays [ 21 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Model-Based Position and Reflectivity Estimation of Fiber Bragg Grating Sensor Arrays

Werzinger

Zibar

Köppel

et al. 2018

Sensors

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We propose an efficient model-based signal processing approach for optical fiber sensing with fiber Bragg grating (FBG) arrays. A position estimation based on an estimation of distribution algorithm (EDA) and a reflectivity estimation method using a parametric transfer matrix model (TMM) are outlined in detail. The estimation algorithms are evaluated with Monte Carlo simulations and measurement data from an incoherent optical frequency domain reflectometer (iOFDR). The model-based approach outperforms conventional Fourier transform processing, especially near the spatial resolution limit, saving electrical bandwidth and measurement time. The models provide great flexibility and can be easily expanded in complexity to meet different topologies and to include prior knowledge of the sensors. Systematic errors due to crosstalk between gratings caused by multiple reflections and spectral shadowing could be further considered with the TMM to improve the performance of large-scale FBG array sensor systems.

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Crosstalk and Ghost Gratings in a Large-Scale Weak Fiber Bragg Grating Array

Cited by 20 publications

References 10 publications

Code Division Multiplexing Applied to FBG Sensing Networks: FBG Sensors Designed as Discrete Prolate Spheroidal Sequences (DPSS-FBG Sensors)

Code Division Multiplexing Applied to FBG Sensing Networks: FBG Sensors Designed as Discrete Prolate Spheroidal Sequences (DPSS-FBG Sensors)

Fiber optic sensing technologies potentially applicable for hypersonic wind tunnel harsh environments

Model-Based Position and Reflectivity Estimation of Fiber Bragg Grating Sensor Arrays

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