Simulation of Distributed Detection of Ammonia Gas

Sýkora, Ota; Aubrecht, Jan; Klepáček, Rudolf; Kalvoda, L.

doi:10.1007/978-94-007-0317-9_7

Cited by 1 publication

(1 citation statement)

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“…The first scenario is considered by assuming a first order diffusion model of the hydrocarbon in question through the cladding layers. According to [ 24 ], the mass concentration of the chemical agent in question will grow in time until reaching a steady-state concentration profile that varies linearly between the initial concentration of 0 mol/L at the core/cladding interface and the ambient concentration of the hydrocarbon in the medium surrounding the cladding. This results in the diffusion modeled RI profile depicted by Figure 4 .…”

Section: Characterization Of Otdr Traces Using Established Theoretmentioning

confidence: 99%

Analytical Modeling Tool for Design of Hydrocarbon Sensitive Optical Fibers

Handawi

Vahdati

Shiryayev

et al. 2017

Sensors

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Pipelines are the main transportation means for oil and gas products across large distances. Due to the severe conditions they operate in, they are regularly inspected using conventional Pipeline Inspection Gages (PIGs) for corrosion damage. The motivation for researching a real-time distributed monitoring solution arose to mitigate costs and provide a proactive indication of potential failures. Fiber optic sensors with polymer claddings provide a means of detecting contact with hydrocarbons. By coating the fibers with a layer of metal similar in composition to that of the parent pipeline, corrosion of this coating may be detected when the polymer cladding underneath is exposed to the surrounding hydrocarbons contained within the pipeline. A Refractive Index (RI) change occurs in the polymer cladding causing a loss in intensity of a traveling light pulse due to a reduction in the fiber’s modal capacity. Intensity losses may be detected using Optical Time Domain Reflectometry (OTDR) while pinpointing the spatial location of the contact via time delay calculations of the back-scattered pulses. This work presents a theoretical model for the above sensing solution to provide a design tool for the fiber optic cable in the context of hydrocarbon sensing following corrosion of an external metal coating. Results are verified against the experimental data published in the literature.

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Section: Characterization Of Otdr Traces Using Established Theoretmentioning

confidence: 99%