Numerical and experimental investigation of FBG strain response at cryogenic temperatures

Venkatesan, Venkataraman Narayanan; Ramalingam, R.

doi:10.1088/1757-899x/171/1/012133

Cited by 15 publications

(2 citation statements)

References 11 publications

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“…Two possible methods to accomplish this suggest themselves: varying the temperature or the tension of a complex FBG can produce the required modulation. This is because the Bragg wavelength (λ B ) of an FBG is affected by both temperature and by applied strain by an amount (∆λ B ) that can be expressed as 27 :…”

Section: Cross-correlation Spectroscopy: Theorymentioning

confidence: 99%

Cross-Correlation Using a Complex Aperiodic FBG: A New Technique for Gas Detection

Rahme,

Tuthill,

Betters

et al. 2023

Preprint

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Optical cross-correlation is a technique that can achieve both high specificity and high sensitivity when deployed as the basis for a sensing technology. Offering significant gains in cost, size and complexity, it can also deliver significantly higher signal-to-noise ratios than traditional approaches such as absorption methodologies. In this paper, we present an optical cross-correlation technology constructed around a bespoke customised Fiber Bragg Grating (FBG). Exploiting the remarkable flexibility in design enabled by multiple aperiodic Bragg gratings, optical filters are devised that exactly mimic the absorption features of a target gas species (for this paper, acetylene C2H2) over some waveband of interest. This grating forms the heart of the sensor architecture described here that employs modulated optical cross-correlation for gas detection. An experimental demonstration of this approach is presented, and shown to be capable of differentiating between different concentrations of the C2H2 target gas.Furthermore these measurements are shown to be robust against interloper species, with minimal impact on the detection signal-to-noise arising from the introduction of contaminant gases. This represents is a significant step toward the use of customised FBGs as low-cost, compact, and highly customisable photonic devices for deployment in gas detection.

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Section: Cross-correlation Spectroscopy: Theorymentioning

confidence: 99%

Cross-Correlation Using a Complex Aperiodic FBG: A New Technique for Gas Detection

Rahme,

Tuthill,

Betters

et al. 2023

Preprint

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show abstract

“…For FBGs created in a standard quartz optical fiber (9/125

m), a linear relationship takes place between the change in the wavelength

of the maximum spectral density of reflected radiation and the relative elongation of the FBG

[ 1 , 7 , 28 ]:

where

is the proportionality coefficient approximately equal to 1.2 · 10

nm (12 nm per % or 1.2 · 10

nm per

) when the FBG is stretched at

1550 nm and room temperature. It should be noted that

depends on the temperature of the FBG [ 29 , 30 ] and linearly depends on

[ 28 ].…”

Section: Introductionmentioning

confidence: 99%

Application of Fiber Bragg Gratings as a Sensor of Pulsed Mechanical Action

Kiesewetter

Krivosheev

Magazinov

et al. 2022

Sensors

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The pulsed elongation of fiber Bragg gratings is considered in order to be used to measure the displacement or deformation rate of objects. Optimal measurement modes were determined, numerical simulation of the output signal was performed during pulsed elongation or compression of the fiber grating, and the main patterns were analyzed. The results of the application of the Bragg gratings for the experimental determination of the deformation rate of materials under pulsed magnetic action are presented. Experimentally obtained and theoretical dependencies are compared. The dependencies of the change in the grating parameters—the coefficient and the half-width of the reflection spectrum with successive shortening of the grating—are given.

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Optimized Cryogenic FBG Sensitivity Coefficient Calibration for High-Precision Thermal Expansion Measurements

et al. 2023

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Numerical and experimental investigation of FBG strain response at cryogenic temperatures

Cited by 15 publications

References 11 publications

Cross-Correlation Using a Complex Aperiodic FBG: A New Technique for Gas Detection

Cross-Correlation Using a Complex Aperiodic FBG: A New Technique for Gas Detection

Application of Fiber Bragg Gratings as a Sensor of Pulsed Mechanical Action

Optimized Cryogenic FBG Sensitivity Coefficient Calibration for High-Precision Thermal Expansion Measurements

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