Polyvinyl alcohol coated photonic crystal optical fiber sensor for humidity measurement

Wong, Wei Chang; Chan, Chi Chiu; Chen, Li Han; Tao, Li; Lee, Kok Xian; Leong, K. C.

doi:10.1016/j.snb.2012.07.032

Cited by 137 publications

(52 citation statements)

References 33 publications

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“…[1][2][3]. A series of detection methods had been developed by measuring changes in luminescence [4], surface acoustic wave (SAW) [5], field effect transistor (FET) [6], or electrical conductivity [7] of sensing materials upon adsorption of water molecules. Many materials, including carbon nanotubes [8,9], graphitic carbon nitride [10], metal oxide [6], polymers and composites [11,12], have been used for humidity sensoring.…”

Section: Introductionmentioning

confidence: 99%

Free-standing dried foam films of graphene oxide for humidity sensing

Feng

Chen

Yan

2015

Sensors and Actuators B: Chemical

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Section: Introductionmentioning

confidence: 99%

Free-standing dried foam films of graphene oxide for humidity sensing

Feng

Chen

Yan

2015

Sensors and Actuators B: Chemical

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“…In the research of optical fiber humidity sensor, although optical fiber humidity sensor type and structure design are very important, humidity sensitive material also plays a key role in improving measurement performance of optical fiber humidity sensor [9]. In order to improve humidity sensor sensitivity, researchers tried to adopt various materials as humidity sensitive material, such as polyvinyl alcohol [10], metal oxide films [11], and chitosan [8].…”

Section: Introductionmentioning

confidence: 99%

Improving the Sensitivity of Humidity Sensor Based on Mach-Zehnder Interferometer Coated with a Methylcellulose

Huang

Wang

2018

International Journal of Optics

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A novel humidity sensor based on Mach-Zehnder interferometer (MZI) with the single-mode fiber (SMF) coated with methylcellulose (MC) is proposed and experimentally demonstrated. The MZI consists of two waist enlarged structures. Such an all-fiber MZI incorporates an intermodal interference between the core mode and cladding modes. The MC is coated on the surface of the SMF. External humidity changes the refractive index of MC, causing the intensity changes of the interference pattern. The proposed sensor is linearly responsive to refractive humidity (RH) within the range from 45% to 85% RH, with sensitivity of 0.094 dB/%RH. Moreover the insensitivity of the fiber to the temperature makes this structure more suitable for practical measurement.

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“…Such microcavity are also inexpensive, simple to fabricate, and are compatible with integrated optics. Optical microcavity resonators are particularly useful for optical sensing given that ultra-high Q factors in the order of ~10 10 have been demonstrated for a variety of sensing applications [3]. The presence of water vapors in the air is known as humidity.…”

Section: Introductionmentioning

confidence: 99%

“…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. The methods involved in the measurement of humidity using fiber optic humidity sensor are based on a variety of principles, including absorption [8], evanescent wave [9], interferometric [10], strain [11] and the use of an LPFG (Long Period Fiber Grating) [12]. Due to the ultra-high Q factor of optical microresonator, the potential resolution for humidity measurement is better than other fiber optic humidity sensors.…”

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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Polyvinyl alcohol coated photonic crystal optical fiber sensor for humidity measurement

Cited by 137 publications

References 33 publications

Free-standing dried foam films of graphene oxide for humidity sensing

Free-standing dried foam films of graphene oxide for humidity sensing

Improving the Sensitivity of Humidity Sensor Based on Mach-Zehnder Interferometer Coated with a Methylcellulose

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

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