Apodization Optimization of FBG Strain Sensor for Quasi-Distributed Sensing Measurement Applications

Chaoui, Fahd; Aghzout, Otman; Chakkour, Mounia; Yakhloufi, Mounir El

doi:10.1155/2016/6523046

Cited by 18 publications

(6 citation statements)

References 5 publications

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“…The reflectivity of these FBGs ranged between ~50% and ~80%. The stripped and re-coated gratings also showed much better side-lobe suppression than the trans-jacket gratings as it is typically easier to accurately focus the light in the core of the fibre and control the apodization features of the index contrast with the coating removed [25]. The degree of side-lobe suppression is significant as it has a direct influence on the number of gratings which can be accommodated within a spectrally dense sensor array before interference from side lobes starts to affect the bounding gratings in the array.…”

Section: Resultsmentioning

confidence: 99%

Fatigue Performance of Type I Fibre Bragg Grating Strain Sensors

Zhang

Davis

Chiu

et al. 2019

Sensors

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Although fibre Bragg gratings (FBGs) offer obvious potential for use in high-density, high-strain sensing applications, the adoption of this technology in the historically conservative aerospace industry has been slow. There are several contributing factors, one of which is variability in the reported performance of these sensors in harsh and fatigue prone environments. This paper reports on a comparative evaluation of the fatigue performance of FBG sensors written according to the same specifications using three different grating manufacturing processes: sensors written in stripped and re-coated fibres, sensors written during the fibre draw process and sensors written through fibre coating. Fatigue cycling of the fibres is provided by a customized electro-dynamically actuated loading assembly designed to provide high frequency and amplitude loading. Pre- and post-fatigue microscopic analysis and high-resolution transmission and reflection spectra scanning are conducted to investigate the fatigue performance of FBGs, the failure regions of fibres as well as any fatigue-related effects on the spectral profiles. It was found that because of the unique fabrication method, the sensors written through the fibre coating, also known as trans-jacket FBGs, show better fatigue performance than stripped and re-coated FBGs with greater control possible to tailor the optical reflection properties compared to gratings written in the draw tower. This emerging method for inscription of Type I gratings opens up the potential for mass production of higher reflectivity, apodised sensors with dense or complex array architectures which can be adopted as sensors for harsh environments such as in defence and aerospace industries.

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Section: Resultsmentioning

confidence: 99%

Fatigue Performance of Type I Fibre Bragg Grating Strain Sensors

Zhang

Davis

Chiu

et al. 2019

Sensors

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“…Each FBG consists of specific Bragg wavelength on the sensor network, due to which the location of every FBG might be identified. In this instance, the isolation amidst two neighbouring FBG spectrums ought to be optimal to obtain the maximum detectable range of the measurand effects [34]. The resolution within two spectrums minimizes by high scale of side lobes hence the side lobes of one spectrum might intersect with another for minor modifications on the Bragg wavelength by the temperature as well as the strain response.…”

Section: Quasi-distributed Sensing Approachmentioning

confidence: 99%

Optimization and analysis of apodized fiber Bragg grating properties for quasi-distributed sensing

Mandal,

Sidhishwari

2024

Phys. Scr.

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An apodized fiber Bragg grating (FBG) is introduced with a proposed apodization function for the effective quasi-distributed sensing estimation of the temperature and the strain. FBG features such as reflectivity, side lobes, and bandwidth have been optimized for the designed apodized grating to upgrade the effectiveness of FBG for properly measuring the variations in the Bragg wavelength. Based upon the simulation, a comparative analytical study on FBG properties with different apodization function profiles has been demonstrated to achieve the optimum profile with high reflectivity, narrow bandwidth and minimal range of side lobes for quasi-distributed sensing estimation of parameters. A strong linearity has been noted for the sensitivity of designed FBG with different apodization profiles for the temperature and the strain estimation subsequently. It has been reported that the obtained sensitivity of measurands for the FBG with proposed apodization profile are higher as compared with the other profiles. The wavelength division multiplexing (WDM) based quasi-distributed network of four optimized FBGs have been implemented for different apodization profiles to illustrate the impact of apodization to prevent overlapping between neighbouring FBG spectrums in the sensing network with spatial resolution of 2 nm. The maximal detectable temperature/strain sensitivity estimation of 153 °C / 1439 μϵ have been obtained for the proposed apodized FBG along with minimal detectable temperature/strain ranges of -102 °C / -1345 μϵ in the quasi-distributed network. The achieved ranges with optimum resolution can be implemented effectively in quasi-distributed based sensing application for condition observation of civil infrastructures in any complex circumstances.

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“…Unlike the local point sensors, quasi-distributed sensors are suitable for monitoring large structures because there is no need to install transmission fibers at each test site separately [ 98 ]. Due to its reliability and robustness, the WDM-FBG sensor has revealed great application potential at quasi-distributed sensing fields of temperature, strain, pressure, and ultrasound detection [ 99 , 100 , 101 , 102 ].…”

Section: Typical Applications Of Ofss For Marine Shmmentioning

confidence: 99%

Marine Structural Health Monitoring with Optical Fiber Sensors: A Review

Chen

Wang

Zhang

et al. 2023

Sensors

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Real-time monitoring of large marine structures’ health, including drilling platforms, submarine pipelines, dams, and ship hulls, is greatly needed. Among the various kinds of monitoring methods, optical fiber sensors (OFS) have gained a lot of concerns and showed several distinct advantages, such as small size, high flexibility and durability, anti-electromagnetic interference, and high transmission rate. In this paper, three types of OFS used for marine structural health monitoring (SHM), including point sensing, quasi-distributed sensing, and distributed sensing, are reviewed. Emphases are given to the applicability of each type of the sensors by analyzing the operating principles and characteristics of the OFSs. The merits and demerits of different sensing schemes are discussed, as well as the challenges and future developments in OFSs for the marine SHM field.

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Apodization Optimization of FBG Strain Sensor for Quasi-Distributed Sensing Measurement Applications

Cited by 18 publications

References 5 publications

Fatigue Performance of Type I Fibre Bragg Grating Strain Sensors

Fatigue Performance of Type I Fibre Bragg Grating Strain Sensors

Optimization and analysis of apodized fiber Bragg grating properties for quasi-distributed sensing

Marine Structural Health Monitoring with Optical Fiber Sensors: A Review

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