Optical fiber relative-humidity sensor with polyvinyl alcohol film

Gaston, A.; Pérez, Falcón; Sevilla, J.

doi:10.1364/ao.43.004127

Cited by 106 publications

(47 citation statements)

References 11 publications

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“…Many of these sensing techniques involve using humidity sensitive coatings or gels on the surfaces or end faces of the optical fiber. For example, hydrogel polymers, such as polyvinyl alcohol (PVA) [15,16], polyethylene glycol [17] and Agarose [18], have been previously proposed and studied as coating materials for optical fiber based humidity sensors. Such polymer coatings have the advantage of good reproducibility and long term stability.…”

Section: Introductionmentioning

confidence: 99%

Agarose coated spherical micro resonator for humidity measurements

Mallik¹,

Liu²,

Kavungal³

et al. 2016

Opt. Express

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Abstract:A new type of fiber optic relative humidity (RH) sensor based on an agarose coated silica microsphere resonator is proposed and experimentally demonstrated. Whispering gallery modes (WGMs) in the micro resonator are excited by evanescent coupling using a tapered fiber with ~3.3 µm waist diameter. A change in the relative humidity of the surrounding the resonator air induces changes in the refractive index (RI) and thickness of the Agarose coating layer. These changes in turn lead to a spectral shift of the WGM resonances, which can be related to the RH value after a suitable calibration. Studies of the repeatability, long-term stability, measurement accuracy and temperature dependence of the proposed sensor are carried out. The RH sensitivity of the proposed sensor depends on the concentration of the agarose gel which determines the initial thickness of the deposited coating layer. Studies of the micro-resonators with coating layers fabricated from gels with three different Agarose concentrations of 0.5%, 1.125% and 2.25 wt./vol.% showed that an increase in the initial thickness of the coating material results in an increase in sensitivity but also leads to a decrease of quality factor (Q) of the micro resonator. The highest sensitivity achieved in our experiments was 518 pm/%RH in the RH range from 30% to 70%. The proposed sensor offers the advantages of a very compact form factor, low hysteresis, good repeatability, and low cross sensitivity to temperature.

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Section: Introductionmentioning

confidence: 99%

Agarose coated spherical micro resonator for humidity measurements

Mallik¹,

Liu²,

Kavungal³

et al. 2016

Opt. Express

View full text Add to dashboard Cite

show abstract

“…In order to enhance the sensitivity of the humidity sensor, several humidity sensing materials have been previously investigated and applied as coated layers including polyvinyl alcohol (PVA) [15], agarose [16], gelatin [17], polyethylene oxide (PEO) [18] and carbon nanotubes [19]. When the surrounding humidity changes, the refractive index of these materials exhibit a corresponding variation, and hence the transmission of light through the structures is altered in a detectable way, allowing for sensing of humidity.…”

Section: Introductionmentioning

confidence: 99%

A Humidity Sensor Based on a Singlemode-Side Polished Multimode–Singlemode Optical Fibre Structure Coated with Gelatin

Wang

Farrell

Lewis

et al. 2017

J. Lightwave Technol.

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Abstract-A novel relative humidity sensor based on a singlemode-side polished multimode-singlemode (SSPMS) fibre structure coated with gelatin material is reported. The sensing principle and fabrication method of the proposed sensor are presented. The experimental method is demonstrated to provide the optimum thickness of coating layers in order to achieve the highest sensitivity of 0.14 dB/%RH and a fast response time of 1000 ms for a given RH sensing range. The developed humidity fibre optic sensor based on a gelatin coating shows great potential for many applications such as industrial production, food processing and environmental monitoring.

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“…The sensing material for typical humidity sensors include metal oxides [5,6], ceramics [7,8], polymers [9,10]. However, these humidity sensors may suffer from low sensing response or slow time response since water molecules have to diffuse into the sensing material to induce the electrical property changes.…”

Section: Introductionmentioning

confidence: 99%

High performance humidity sensors based on dopamine biomolecules coated gold-nanoparticles

2012

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This study presents a simple process for producing resistance-based humidity sensors utilizing dopamine (DA) coated gold nano-particles (AuNPs) as the sensing material. Highly hydrophilic bio-molecule of dopamine is physically bonded onto 4-6 nm AuNPs to enhance the humidity sensing performance. Results show that the DA coated AuNPs have nice humidity sensing responses in the measuring range of 20-90%RH. The measured resistance response shows >1900 times greater than the sensor using the same AuNPs without DA coating. The developed humidity sensor shows rapid time responses for water absorption (5 s) and desorption (10 s), respectively. Moreover, a 3-day long-term measurement at low medium and high humidity ranges also shows the good stability of the developed sensor. The method developed in this study provides a simple and low-cost method to produce highperformance humidity sensors with DA-coated AuNPs.

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Optical fiber relative-humidity sensor with polyvinyl alcohol film

Cited by 106 publications

References 11 publications

Agarose coated spherical micro resonator for humidity measurements

Agarose coated spherical micro resonator for humidity measurements

A Humidity Sensor Based on a Singlemode-Side Polished Multimode–Singlemode Optical Fibre Structure Coated with Gelatin

High performance humidity sensors based on dopamine biomolecules coated gold-nanoparticles

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