Distributed pH and water detection using fiber-optic sensors and hydrogels

Michie, Craig; Culshaw, Brian; Konstantaki, Maria; McKenzie, I.; Kelly, Stephen; Graham, N.B.; Morán, Carmen

doi:10.1109/50.400706

Cited by 55 publications

(37 citation statements)

References 6 publications

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“…Detecting these leaks is a difficult, important and challenging problem and another one in which innovation in fibre sensors may begin to provide a solution. Figure 13 shows the principle of a microbend based distributed sensor first demonstrated to detect water somewhat over a decade ago [30] . Since then through collaborative research projects it has been demonstrated as a technique to detect oil and organic solvents through using different interface materials.…”

Section: Fibre Optic Sensors: Technology Push and Market Pullmentioning

confidence: 99%

Research to reality: bringing fibre optic sensors into applications

Culshaw

2005

SPIE Proceedings

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Approaching four decades have elapsed since the first patents were filed on fibre optic sensor technology. During that time basic principles have become well characterised and established and technological approaches and sensor realisation have become commercially and practically viable. This paper reviews just some of the progress in fibre sensors highlighting in particular the mechanisms involved in turning the bench demonstrator into competitive and effective product

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Section: Fibre Optic Sensors: Technology Push and Market Pullmentioning

confidence: 99%

Research to reality: bringing fibre optic sensors into applications

Culshaw

2005

SPIE Proceedings

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“…To monitor the submersion, various water sensors have been developed using optical fiber bending [1], hydrogel fiber [2,3] and side-polished fibers [4][5][6]. The sensors based on the fiber bending and hydrogel fiber use swelling materials.…”

Section: Introductionmentioning

confidence: 99%

Remote Monitoring of Abrupt Overflowing in Common Utility Duct Using Reflective Side-Polished Optical Fiber Submersion Sensor

Lee¹,

Kim²,

Kang³

et al. 2008

Journal of the Optical Society of Korea

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The submersion monitoring system based on a reflective side-polished optical fiber submersion sensor with an optical fiber mirror was shown to be an effective alarm system with remote monitoringwhen the drainage capacity of a common utility duct is exceeded due to heavy rainfall. The proposed sensor was connected to an existing installed optical fiber network at a height of 250mm in a common utility duct, and then tested under sample materials (distilled water, river water, sea water, foul water, muddy water, petroleum, edible oil) at a distance of 1km from the sensor for remote sensing. In experiments, the proposed real-time sensor system reduced maintenance cost and improved monitoring efficiency by using a reflection-type side-polished optical fiber submersion sensor efficient for remote monitoring of a common utility duct.

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“…Up to now a number of papers on distributed chemical sensing with optical fibers have been published. Typical chemical parameters to be measured with these sensors were pH 4 and oxygen concentration 5 (both using fluorescence backscatter measurements), humidity 6,7 and hydrocarbon contact 8 .…”

Section: Introductionmentioning

confidence: 99%

Distributed fiber optical HC leakage and pH sensing techniques for implementation into smart structures

Buerck

Vogel²,

Roth

et al. 2004

SPIE Proceedings

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Interaction of target molecules with the evanescent wave of light guided in optical fibers is among the most promising sensing schemes for building up smart chemical sensor technologies. If the technique of optical time domain reflectometry (OTDR) is combined with silicone-clad quartz glass fibers distributed chemical sensing is possible. Hydrocarbon (HC) detection and location is done by automated identification of the position of the corresponding step drop (light loss) in the backscatter signal induced by local refractive index increase in the silicone cladding due to a penetrating HC compound. A commercially available mini-OTDR was adapted to sensing fibers of up to nearly 2-kilometer length and location of typical HC fuels could be demonstrated. The instrument is applicable for fuel leakage monitoring in large technical installations such as tanks or pipelines with spatial resolution down to 1 m. A similar technique using measurements in the Vis spectral range is being developed for health monitoring of large structures, e.g., for early detection of corrosion caused by water ingress and pH changes in reinforced concrete. Here, a pH indicator dye and a phase transfer reagent are immobilized in the originally hydrophobic fiber cladding, leading to a pH induced absorption increase and a step drop signal in the backscatter curve. The configuration of the distributed sensing cables, the instrumental setups, and examples for HC and pH sensing are presented.

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Distributed pH and water detection using fiber-optic sensors and hydrogels

Cited by 55 publications

References 6 publications

Research to reality: bringing fibre optic sensors into applications

Research to reality: bringing fibre optic sensors into applications

Remote Monitoring of Abrupt Overflowing in Common Utility Duct Using Reflective Side-Polished Optical Fiber Submersion Sensor

Distributed fiber optical HC leakage and pH sensing techniques for implementation into smart structures

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