High Sensitivity Fiber Bragg Grating Humidity Sensors Made With Through-the-Coating Femtosecond Laser Writing and Polyimide Coating Thickening

Mihailov, Stephen J.; Ding, Huimin; Szabo, Katherine; Hnatovsky, Cyril; Walker, Robert B.; Lu, Ping; De Silva, Manny

doi:10.1109/lsens.2024.3398432

IEEE Sens. Lett.

2024

DOI: 10.1109/lsens.2024.3398432

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High Sensitivity Fiber Bragg Grating Humidity Sensors Made With Through-the-Coating Femtosecond Laser Writing and Polyimide Coating Thickening

Stephen J. Mihailov,

Huimin Ding,

Katherine Szabo

et al.

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Cited by 2 publications

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Error Analysis and Experimental Research of Temperature/Strain Sensing Based on Few-Mode Fiber Bragg Grating

Hao,

Liao,

Miao

et al. 2024

Fiber and Integrated Optics

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Error Analysis and Experimental Research of Temperature/Strain Sensing Based on Few-Mode Fiber Bragg Grating

Hao,

Liao,

Miao

et al. 2024

Fiber and Integrated Optics

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Temperature-compensated fiber optic hydrogen sensing with an in-fiber Fabry-Perot etalon and a Pd:Ni-coated cavity

Buchfellner,

Roehrl,

Yang

et al. 2024

Opt. Express

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This study presents an in-situ temperature-decoupled sensor platform utilizing an in-fiber Fabry-Perot (FP) etalon made of two fiber Bragg gratings (FBGs) for simultaneous hydrogen concentration and temperature sensing. The platform’s key feature is a palladium-alloy-coated fiber section between the FBGs, while the FBGs themselves remain without coating. This design shifts the FP transmission fringes due to hydrogen-induced strain and temperature. In contrast, the envelope function induced by the FBG spectra shifts only with temperature, enabling intra-spectral referencing of the fringe wavelength to the envelope vertex wavelength and thereby compensating for temperature effects. This work discusses a fully zero-point-referenced sensor calibration for simultaneous hydrogen and temperature monitoring. Hydrogen calibration demonstrated precise measurement of concentrations ranging from 500 to 20,000 ppm(H2) in a temperature range of 20∘C to 50∘C. Utilizing an iterative matrix algorithm, the non-linear hydrogen response was linearized and temperature cross-sensitivity was almost completely decoupled, leading to the representation of hydrogen concentrations with standard errors of the mean of 4.3% at repeated 1,000 ppm cycles, 2.8% at repeated 10,000 ppm cycles, and temperature measurement uncertainties of ±0.2∘C. This proof-of-concept demonstrates the detection of low hydrogen quantities without distraction from temperature and thereby opens the path for fiber optic hydrogen sensing applications outside laboratories.

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High Sensitivity Fiber Bragg Grating Humidity Sensors Made With Through-the-Coating Femtosecond Laser Writing and Polyimide Coating Thickening

Cited by 2 publications

References 12 publications

Error Analysis and Experimental Research of Temperature/Strain Sensing Based on Few-Mode Fiber Bragg Grating

Error Analysis and Experimental Research of Temperature/Strain Sensing Based on Few-Mode Fiber Bragg Grating

Temperature-compensated fiber optic hydrogen sensing with an in-fiber Fabry-Perot etalon and a Pd:Ni-coated cavity

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