Quasi-distributed fibre-optic chemical sensing usingtelecom optical fibre

Murphy, V.; MacCraith, Brian D.; Butler, Thomas M.; McDonagh, Colette; Lawless, B. G.

doi:10.1049/el:19970392

Cited by 11 publications

(8 citation statements)

References 3 publications

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“…This current paper considers two techniques for producing Fabry-Perot cavities within a singlemode optical fibre. Firstly, a detailed account is presented on the first method where the cavities are produced using an etching technique previously identified by Murphy et al 9 . Secondly, preliminary and proof-of-concept results are presented on the use of an excimer laser to create the Fabry-Perot cavity in silica and sapphire optical substrates.…”

Section: Ilfpe and Affpe Sensorsmentioning

confidence: 99%

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<title>New techniques for manufacturing optical-fiber-based fiber Fabry-Perot sensors</title>

Tuck

Fernando

2002

SPIE Proceedings

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Optical fibre-based extrinsic Fabry-Perot interferometric (EFPI) sensors have been extensively deployed for sensing a number of measurands including temperature, strain, vibration and pressure. Their circular cross-section has made it relatively simple and attractive to embed them in advanced fibre reinforced composites (AFRCs) such as glass and carbon fibres. However, a typical construction of an EFPI consists of two optical fibres that are positioned and secured within a precision bore capillary. The relative outer diameters of the various key components are as follows: capillary = 300 µm; optical fibre = 125 µm; carbon and glass fibres = 8 and 14 µm respectively. This mismatch in relative diameters of the reinforcing and the sensor fibres can result in significant spatial distortion of the former. The location of the embedded sensing fibre in relation to the reinforcing fibre layers can also lead to the formation of resin-rich regions in the AFRC. These factors can have a detrimental effect on the compressive properties of the material. Therefore, there is significant attraction in reducing the overall diameter of the sensor.In this current paper, the feasibility of reducing the diameter of EFPI sensor design to that of the optical fibre is demonstrated via two techniques. The first technique involved the use of hydrofluoric acid to etch and create the FabryPerot cavity. In the second technique, the feasibility of using laser ablation to fabricate the Fabry-Perot cavity in silica and sapphire substrates is presented. The optical fibre-based Fabry-Perot cavity produced via acid etching was interrogated using white light interferometry.

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Section: Ilfpe and Affpe Sensorsmentioning

confidence: 99%

“…Murphy et al 9 reported on the use of etched multimode fibres as a quasi distributed chemical sensor. They produced sensors by etching 50/125 graded index optical fibre with hydrofluoric (HF) acid.…”

Section: Literature Reviewmentioning

confidence: 99%

<title>New techniques for manufacturing optical-fiber-based fiber Fabry-Perot sensors</title>

Tuck

Fernando

2002

SPIE Proceedings

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“…Chemical OTDR sensing based on changes of absorption [11,17,18], of refractive index [19] and also luminescence intensity [20] were reported. In literature the combination of OTDR with life time based luminescence sensor dyes is mentioned [21], but to the best of our knowledge not yet realized.…”

Section: Introductionmentioning

confidence: 99%

Distributed Fiber Optical Sensing of Oxygen with Optical Time Domain Reflectometry

Eich

Schmälzlin²,

Löhmannsröben

2013

Sensors

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In many biological and environmental applications spatially resolved sensing of molecular oxygen is desirable. A powerful tool for distributed measurements is optical time domain reflectometry (OTDR) which is often used in the field of telecommunications. We combine this technique with a novel optical oxygen sensor dye, triangular-[4] phenylene (TP), immobilized in a polymer matrix. The TP luminescence decay time is 86 ns. The short decay time of the sensor dye is suitable to achieve a spatial resolution of some meters. In this paper we present the development and characterization of a reflectometer in the UV range of the electromagnetic spectrum as well as optical oxygen sensing with different fiber arrangements.

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“…For example, sensor systems for measuring strain [10], pressure [11,12] and chemical species [13] have been reported. Vaziri and Chen [10] fabricated periodically etched sections on the cladding of the silica fibres using HFA etching and photolithography.…”

Section: Introductionmentioning

confidence: 99%

“…Murphy et al [13] produced cavities in germania-doped graded-index profile silica fibres using HFA etching. These cavities were filled with a micro-porous sol-gel matrix containing an analyte dye, which fluoresced upon irradiation at specific wavelengths.…”

Section: Introductionmentioning

confidence: 99%

Acid-etched Fabry-Perot micro-cavities in optical fibres

2007

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Significant progress has been made in recent years on the design and fabrication of optical fibre-based sensor systems for applications in structural health monitoring. Two sensor designs have tended to dominate namely, fibre Bragg gratings and extrinsic fibre Fabry-Perot sensors. However, the cost and time associated with these sensors is relatively high and as a consequence, the current paper describes a simple procedure to fabricate intrinsic fibre Fabry-Perot interferometric strain sensors. The technique involves the use of hydrofluoric acid to etch a cavity in a cleaved optical fibre. Two such etched cavities were fusion spliced to create an intrinsic fibre Fabry-Perot cavity. The feasibility of using this device for strain monitoring was demonstrated. Excellent correlation was obtained between the optical and surface-mounted electrical resistance strain gauge.

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Quasi-distributed fibre-optic chemical sensing usingtelecom optical fibre

Cited by 11 publications

References 3 publications

<title>New techniques for manufacturing optical-fiber-based fiber Fabry-Perot sensors</title>

<title>New techniques for manufacturing optical-fiber-based fiber Fabry-Perot sensors</title>

Distributed Fiber Optical Sensing of Oxygen with Optical Time Domain Reflectometry

Acid-etched Fabry-Perot micro-cavities in optical fibres

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