Mode-filtered light methane gas sensor based on cryptophane A

Wu, Suozhu; Zhang, Yan; Li, Zhongping; Shuang, Shaomin; Dong, Chuan; Choi, Martin M.F.

doi:10.1016/j.aca.2008.11.051

Cited by 36 publications

(8 citation statements)

References 21 publications

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“…An optical fiber sensor coated with a thin silicone cladding of cryptophane A into a fused-silica capillary for methane (CH 4 ) gas determination at ambient conditions was developed [89]. Its response to CH 4 was determined by the light filtered through the fiber.…”

Section: Dissolved Gas Analysismentioning

confidence: 99%

Review of Fiber Optic Diagnostic Techniques for Power Transformers

N’cho

Fofana

2020

Energies

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Diagnostic and condition monitoring of power transformers are key actions to guarantee their safe operation. The subsequent benefits include reduced service interruptions and economic losses associated with their unavailability. Conventional test methods developed for the condition assessment of power transformers have certain limitations. To overcome such problems, fiber optic-based sensors for monitoring the condition of transformers have been developed. Flawlessly built-up fiber optic-based sensors provide online and offline assessment of various parameters like temperature, moisture, partial discharges, gas analyses, vibration, winding deformation, and oil levels, which are based on different sensing principles. In this paper a variety and assessment of different fiber optic-based diagnostic techniques for monitoring power transformers are discussed. It includes significant tutorial elements as well as some analyses.

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Section: Dissolved Gas Analysismentioning

confidence: 99%

Review of Fiber Optic Diagnostic Techniques for Power Transformers

N’cho

Fofana

2020

Energies

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“…fabricated a mode-filtered methane sensor, whose detection limit could be down to 0.06%. However, the response time was as long as 5 min [19]. In this work, the cryptophane E molecule, which is generated by using vanillin as raw material, will be infiltrated into the defected holes of PC cavity.…”

Section: System Design and Sensing Principlementioning

confidence: 99%

Theoretical research of gas sensing method based on photonic crystal cavity and fiber loop ring-down technique

Qian

Zhao

Zhang

et al. 2016

Sensors and Actuators B: Chemical

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A high-sensitive gas sensing method is proposed, in which miniaturized photonic crystal (PC) cavity is utilized as the sensing element, and cryptophane E molecular is infiltrated in defected holes of PC cavity as the sensitive material to methane gas. Particularly, slow light in side-coupled PC waveguide is optimized to enhance refractive index sensitivity of the PC cavity and fiber loop ring-down technology is used to demodulate output resonant spectrum of the sensing system. Simulation results demonstrate that a refractive index sensitivity of 450 nm/RIU and a quality factor of 1105 can be obtained in the slow light engineered PC cavity. For measurement of methane concentration, the theoretical sensitivity can be up to 4.21 μs/% and the minimum detectable concentration can be as accurate as 2.37 ppm.

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“…In particular, considerable attention has been given to the combination of optical fibers and sensitive materials such as cryptophane molecules because of its potential application in the fabrication of highly sensitive, fast-response methane gas sensors that can target methane gas in coal-mine production and in environmental applications [5−7] . Several techniques based on the interaction of cryptophane molecules and methane have been developed for methane detection, including the fabrication of an optical fiber sensing element via luminescence reflection [5] , evanescent wave optical fiber sensor [6] , and a mode-filtered light optical fiber sensor [7] .…”

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confidence: 99%

High-sensitivity long-period fiber grating sensor with SAN/cryptophane A for coal mine gas detection

Yang¹,

Huang²,

Li³

et al. 2013

中国光学快报

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A high-sensitivity long-period fiber grating (LPFG) methane sensor that contains a compact and uniform styrene-acrylonitrile (SAN)/cryptophane A nanofilm is presented. The sensor is prepared by using an automatic dip-coater in a solution of cryptophane A, SAN resin dissolved in ortho-dichlorobenzene, a lowvolatile solvent. The effect of film thickness on the LPFG's resonant wavelength is thoroughly investigated. The optimum sensor among the three LPFGs with different film thicknesses is directly used to detect the methane concentration in a coal mine gas sample. The results indicate that the sensors with film thicknesses of 484 to 564 nm exhibit a redshifted resonant wavelength when the methane concentration is increased from 0% to 3.5% (vol). The data demonstrates that the sensor with a film thickness of 484 nm has remarkable sensitivity (∼0.633 nm% −1 ), and its detection limit can reach 0.2%. The methane concentrations determined by our sensor are consistent with those obtained by gas chromatography.

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Mode-filtered light methane gas sensor based on cryptophane A

Cited by 36 publications

References 21 publications

Review of Fiber Optic Diagnostic Techniques for Power Transformers

Review of Fiber Optic Diagnostic Techniques for Power Transformers

Theoretical research of gas sensing method based on photonic crystal cavity and fiber loop ring-down technique

High-sensitivity long-period fiber grating sensor with SAN/cryptophane A for coal mine gas detection

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