Fiber optic humidity sensor using water vapor condensation

Limodehi, Hamid E; Légaré, François

doi:10.1364/oe.25.015313

Cited by 28 publications

(8 citation statements)

References 24 publications

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“…VOC vapors are attracted to the surface of the microtip, and the condensation process takes place when the VOC concentration is sufficient. The environment around the microtip changes from gaseous (air) only to partially liquid due to the droplets’ formation [ 40 ]. This results in the average RI change around the microtip and the measured return loss level.…”

Section: Methodsmentioning

confidence: 99%

Polymer Microtip on a Multimode Optical Fiber as a Threshold Volatile Organic Compounds Sensor

Marć

Żuchowska

Jakubowska

et al. 2022

Sensors

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Polymer microtips are 3D microstructures manufactured on the end face of an optical fiber by using the photopolymerization process. Such micro-optic elements made on a multi-mode optical fiber were previously tested as a transducer of refractive index sensor. These studies were an inspiration to investigate the possibility of using this type of transducer to measure the presence of volatile organic compounds in the air. The experimental results of microtips polymerized with UV and VIS were reported. It was possible to detect the presence of five different volatile compounds in the air due to the sensitivity of the transducer to the refractive indices changes. These changes were induced by the vapors condensed on the microtip surface. The measured time responses have shown that the return loss decreases rapidly as the microtip is inserted inside a glass vial filled with the tested compound. Moreover, correlations between calculated dynamic ranges and refractive indices and volumes of the volatile compounds inside the vials were negligible. Therefore, this type of sensor can be categorized as a condensed material threshold sensor. This sensor can be used in warning systems for monitoring leakages of pipelines carrying volatile chemicals.

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Section: Methodsmentioning

confidence: 99%

Polymer Microtip on a Multimode Optical Fiber as a Threshold Volatile Organic Compounds Sensor

Marć

Żuchowska

Jakubowska

et al. 2022

Sensors

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“…The transmitted power was seen to increase with increasing RH, and the central wavelength decreased with increasing RH. Hamid E. Limodehi et al [ 122 ] relied on the rate of vapor condensation to indicate the RH based on surface plasmon resonance (SPR) to detect changes in the refractive index. The LOD is 3%RH.…”

Section: Literature and The State-of-the-artmentioning

confidence: 99%

Review of Optical Humidity Sensors

Rao

Zhao

et al. 2021

Sensors

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Optical humidity sensors have evolved through decades of research and development, constantly adapting to new demands and challenges. The continuous growth is supported by the emergence of a variety of optical fibers and functional materials, in addition to the adaptation of different sensing mechanisms and optical techniques. This review attempts to cover the majority of optical humidity sensors reported to date, highlight trends in design and performance, and discuss the challenges of different applications.

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“…Optical fiber sensors can be classified in three main groups: interferometers, grating based sensors and sensors based on resonances generated by a thin-film [10]. Within the latter group, one can find two main groups: surface plasmon resonance (SPR) [11] and lossy mode resonance (LMR) based sensors [12]. However, though both phenomena are generated under the presence of a thin-film, the conditions for excitation of the resonance are quite different: SPRs are obtained when the real part of the thin film permittivity is negative and higher in magnitude than both its own imaginary part and the permittivity of the material surrounding the thin film, whereas LMRs occur when the real part of the thin film permittivity is positive and higher in magnitude than both its own imaginary part and the material surrounding the thin film [12,13].…”

Section: Introductionmentioning

confidence: 99%