Fibre-optic sensor technologies for humidity and moisture measurement

Yeo, T.L.; Sun, Tao; Grattan, K. T. V.

doi:10.1016/j.sna.2008.01.017

Cited by 425 publications

(176 citation statements)

References 71 publications

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“…Several devices exist to measure humidity [11]; many of them are either expensive or not suitable to be embedded within wound dressings. Previous research has incorporated electrochemical sensors into wound dressings [12] [13] [14] but optical fibre sensors (OFS) have not yet been investigated in such a setting.…”

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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“…또한, 건물이나 다리와 같은 구조물의 변형 유무를 검사하거나 습 도나 온도 등의 외부 환경 변화를 감지하기 위한 센서 그리 고 의료용 OCT와 같은 다양한 분야에 적용되고 있다 [3][4][5] . 파장 필터를 구현하기 위한 방법으로 박막 구조 [6][7][8] , 패브 리 페로 구조 [9,10] , 그리고 광섬유 격자 구조 [11,12] 등을 이 …”

Section: 서 론unclassified

Polymer Waveguide Apodized Grating for Narrow-Bandwidth High-Reflectivity Wavelength Filters

Lee¹,

Huang²,

Shin³

et al. 2015

Korean Journal of Optics and Photonics

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Wavelength filters are essential components for selecting a certain wavelength channel of a WDM optical communication system. To realize wavelength filters with narrow bandwidth and high reflectivity, an apodized grating structure with length of 15 mm and index modulation of 5×10 -4 was designed. The device exhibited a reflectivity of 95%, 3-dB bandwidth of 0.28 nm, and 20-dB bandwidth of 0.70 nm on an 18 mm grating length.

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“…VER the past decade, fibre optic sensors have become popular in many practical applications due to their unique characteristics such as immunity to electromagnetic interference, biocompatibility, easy multiplexing capability, small size, and their ability to be used in very hazardous and corrosive environments [1]. One of these applications is measuring relative humidity (RH), which has particular significance in structural health monitoring, the semiconductor industry, the medical and health sectors, agriculture, food processing, storage, and many other industrial applications.…”

Section: Introductionmentioning

confidence: 99%

“…Kenneth T. V. Grattan is with School of Mathematics, Computer Science and above mentioned features of fibre optic sensors illustrate their significant advantage over their electrical counterparts, when it comes to humidity measurement [2]. Various types of humidity sensors based on in-fibre gratings have been reported before [1]. In the area of refractive index (RI) sensing, fibre optic sensors based on Long Period Gratings (LPGs) have been preferred over other optical fibre sensor designs due to their high sensitivity to surrounding refractive index [3].…”

Section: Introductionmentioning

confidence: 99%

Graphene-Oxide-Coated Long-Period Grating-Based Fiber Optic Sensor for Relative Humidity and External Refractive Index

Dissanayake

Nguyen

et al. 2018

J. Lightwave Technol.

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This is the accepted version of the paper.This version of the publication may differ from the final published version. City Research Online 1  Abstract-Graphene oxide is a very attractive material for refractive index and humidity sensing due to its unique twodimensional structure, which results in faster response times and improved sensitivity over alternative materials. In this paper, response of a graphene oxide-coated long period grating-based sensor to changes in relative humidity and external refractive index (as well as temperature to provide a correction for any changes) is reported. In fabricating the probes, an improved Hummer's method was used to synthesis the graphene oxide dispersion used as its basis, allowing coating of a functionalized long period grating by using a dip-coating technique. A consistent and stable response of the resonance dip intensity of the graphene oxide-coated long period grating was observed to the change in humidity, achieving a sensitivity of 0.15 dB / %RH with a linear correlation coefficient of 0.980 over the relative humidity range from 60%RH to 95%RH, at room temperature (25 ℃). A blue shift of the resonance band wavelength was recorded when the sensor was exposed to varying temperature conditions from 25 ℃ to 70 ℃ and the response was found to be linear, with a correlation coefficient of 0.997. When evaluating its performance as an external refractive index sensor, sensitivities of ~17dB/RIU in the lower refractive index region (1.33-1.38) and ~55 dB/RIU over the higher refractive index region (1.40-1.45) were achieved. The graphene oxide-coated long period grating sensor probe performed well, showing a good stability and repeatability over a number of test cycles in the performance evaluation carried out. Permanent repository link

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Fibre-optic sensor technologies for humidity and moisture measurement

Cited by 425 publications

References 71 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

Polymer Waveguide Apodized Grating for Narrow-Bandwidth High-Reflectivity Wavelength Filters

Graphene-Oxide-Coated Long-Period Grating-Based Fiber Optic Sensor for Relative Humidity and External Refractive Index

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