Optical fiber humidity sensor based on evanescent-wave scattering

Xu, Lei; Fanguy, Joseph C.; Soni, Krunal; Tao, Shiquan

doi:10.1364/ol.29.001191

Cited by 103 publications

(36 citation statements)

References 40 publications

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“…Previous research has shown different approaches of humidity sensors based on silica core fibre [1] [18] [19]. However, it is known that a silica core fibre may not be suitable for use in a harsh environment due to its fragility after removing the cladding.…”

Section: Studies By Wintermentioning

confidence: 99%

Polymeric optical fibre sensor coated by SiO2 nanoparticles for humidity sensing in the skin microenvironment

Gómez

Morgan

Hayes-Gill

et al. 2018

Sensors and Actuators B: Chemical

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The sensitivity of a low-cost polymeric optical fibre humidity sensor based on transmittance changes due to evanescent wave absorption is reported using test measurements in an environmental chamber and of the skin. The layer-by-layer method was used to coat 30mm of the central unclad section of a multimode polymeric optical fibre with 7 layers of a hydrophilic film consisting of bilayers of poly(allylamine hydrochloride) and SiO2 mesoporous nanoparticles. Sensor characterisation shows a decrease in light transmission as relative humidity increases as a result of refractive index changes of the coating deposited onto the optical fibre which correlates with a commercial capacitive humidity sensor. The sensitivity obtained for the sensor coated with an optimum 7 layers was approximately -3.87x10 -3 and -9.61x10 -3 in transmittance percentage per RH percentage for the range of ~10% to ~75% RH and 90% to 97% RH, respectively. In addition, a response time of 1.5s can be seen for breath monitoring with the polymeric optical fibre humidity sensor. The proof of concept measurements made on the skin indicate that this sensor has the potential to be used to monitor humidity of the skin microenvironment within a wound dressing which can be used to provide better prognosis of healing.

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Section: Studies By Wintermentioning

confidence: 99%

Polymeric optical fibre sensor coated by SiO2 nanoparticles for humidity sensing in the skin microenvironment

Gómez

Morgan

Hayes-Gill

et al. 2018

Sensors and Actuators B: Chemical

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“…These sensors have various applications such as biosensing, chemical sensing, biochemical sensing, and humidity sensing [1][2][3][4][5][6][7]. For example, biosensor is used for biosensing, which is a process that detects the interactions of biological objects with a waveguide surface.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity enhancement of nonlinear waveguide sensors with conducting graphene layer: TE mode

2017

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Abstract:We propose a three-layer waveguide sensor. The proposed sensor consists of a graphene thin layer with constant conductivity at the interface between air and dielectric media with thickness d sitting above a nonlinear layer. The sensitivity of the sensor is derived from the dispersion equation. The sensitivity is calculated for both TE 0 and TE 1 . Results show that the sensitivity of the proposed sensor depends on the conductivity of the graphene layer, the angular frequency, and the thickness of the dielectric layer.

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“…Hence, humidity sensing is very important, especially in the control systems for industrial processes and for human comfort. In recent decades, various humidity sensors have been proposed and developed, which sense relative humidity (RH) in terms of resistance [4,5], capacitance [6], or refractive index (RI) [7]. Fiber-optic humidity sensor has some notable advantages over conventional electronic based humidity sensors, such as miniature dimensions, light weight, a potential for multi-parametric sensing, immunity to electromagnetic interference, water and corrosion resistance and radiation tolerance.…”

Section: Introductionmentioning

confidence: 99%

Compact relative humidity sensor based on an Agarose hydrogel coated silica microsphere resonator

Mallik¹,

Liu²,

Kavungal³

et al. 2017

SPIE Proceedings

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Northumbria University has developed Northumbria Research Link (NRL) to enable users to access the University's research output. Copyright © and moral rights for items on NRL are retained by the individual author(s) and/or other copyright owners. Single copies of full items can be reproduced, displayed or performed, and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided the authors, title and full bibliographic details are given, as well as a hyperlink and/or URL to the original metadata page. The content must not be changed in any way. Full items must not be sold commercially in any format or medium without formal permission of the copyright holder. The full policy is available online: http://nrl.northumbria.ac.uk/policies.html This document may differ from the final, published version of the research and has been made available online in accordance with publisher policies. To read and/or cite from the published version of the research, please visit the publisher's website (a subscription may be required.) Compact humidity sensor based on a multi-layer ABSTRACTIn this paper we report on a novel approach to implementing a compact humidity sensor that utilizes whispering gallery mode (WGM) phenomena in a silica microsphere coated with Agarose hydrogel. The spectral positions of the WGM resonances for such a sensor depend strongly on the refractive index and thickness of the coating. The WGM's spectral shift occurs due to adsorption/desorption of the water vapor in response to changes in ambient humidity and also due to the corresponding changes of the coating thickness. We experimentally investigated the WGMs spectral shift for a 100 µm diameter silica microsphere coated with Agarose hydrogel over a wide range of relative humidity (RH) values from 30%RH to 70%RH at a constant temperature. Six dip coating cycles of 2.25% wt. /vol. Agarose hydrogel were carried out in sequence with a characterization of the sensor performed for each coating thickness. A resonance shift of 16 nm is achieved in our experiment for the six-layer Agarose hydrogel coating sensor.

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Optical fiber humidity sensor based on evanescent-wave scattering

Cited by 103 publications

References 40 publications

Polymeric optical fibre sensor coated by SiO2 nanoparticles for humidity sensing in the skin microenvironment

Polymeric optical fibre sensor coated by SiO2 nanoparticles for humidity sensing in the skin microenvironment

Sensitivity enhancement of nonlinear waveguide sensors with conducting graphene layer: TE mode

Compact relative humidity sensor based on an Agarose hydrogel coated silica microsphere resonator

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