Journal ArticleDOI
LED-based fibre optic oxygen sensor using sol-gel coating
TLDR
In this article, an intrinsic evanescent wave fiber optic sensor for oxygen is reported based on the quenching of fluorescence from a ruthenium complex trapped in the cage-like structure of a sol-gel-derived porous film on a de-clad section of multimode optical fibre.Abstract:
An intrinsic evanescent wave fibre optic sensor for oxygen is reported. The sensor is based on the quenching of fluorescence from a ruthenium complex trapped in the cage-like structure of a sol-gel-derived porous film on a de-clad section of multimode optical fibre. The sensor exhibits excellent performance using blue LED excitation and silicon photodiode detection, and establishes the viability of low-cost portable sensor devices based on the sol-gel process. Gas phase measurement data over the range 0-100% oxygen exhibit high signal-to-noise ratio ( approximately 150), good repeatability and short response time (<5 s).read more
Citations
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Journal ArticleDOI
Optical methods for sensing and imaging oxygen: materials, spectroscopies and applications
Xu-dong Wang,Otto S. Wolfbeis +1 more
TL;DR: The current state of optical methods for sensing oxygen have become powerful alternatives to electrochemical detection and in the process of replacing the Clark electrode in many fields and a selection of specific applications of such sensors are given.
Journal ArticleDOI
Sol-gel glass as a matrix for chemical and biochemical sensing
Jie Lin,Chris W. Brown +1 more
TL;DR: A brief introduction of sol-gel technique and a thorough up-to-date review of the applications of solgel derived glass in chemical and biochemical sensing can be found in this paper.
Journal ArticleDOI
Dissolved oxygen sensor based on fluorescence quenching of oxygen-sensitive ruthenium complexes immobilized in sol–gel-derived porous silica coatings
TL;DR: In this paper, a dissolved oxygen sensor based on the quenching of fluorescence from a ruthenium dye complex entrapped in a porous sol-gel film is reported.
Journal ArticleDOI
Sol-gel coatings for optical chemical sensors and biosensors
Brian D. MacCraith,Colette McDonagh,Gerard O'Keeffe,Aisling K. McEvoy,T. Butler,Fidelma R. Sheridan +5 more
TL;DR: In this article, an overview of the state-of-the-art of optical sensors employing sol-gel-derived coatings is presented, which is particularly suited to the side-coating of optical fibres or waveguides in evanescent-wave sensors.
Journal ArticleDOI
Porphyrin-doped sol-gel glass as a probe for oxygen sensing
Sang-Kyung Lee,Ichiro Okura +1 more
TL;DR: In this article, an optical oxygen sensor was fabricated, based on the phosphorescence quenching of PtOEP, which responded in the range of 0.5 −100% O2.
References
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Journal ArticleDOI
Optical waveguide sensor using evanescent wave excitation of fluorescent dye in sol-gel glass
TL;DR: In this paper, an unclad fiber was dipcoated with a thin layer of porous cladding within which a pH-sensitive dye was entrapped, and the performance of the pH sensor was reported and the potential of the technique for distributed and integrated optic sensing was discussed.
Journal ArticleDOI
Fibre optic pH sensors prepared by sol-gel immobilisation technique
TL;DR: In this article, an improved fiber optic sensor with extended lifetime for pH measurements has been developed based on the absorbance change of organic indicators immobilised in a silica matrix coated as a thin film onto a porous glass optical fiber by the sol-gel technique.
Journal ArticleDOI
All-solid-state instrument for fluorescence-based fibre-optic chemical sensors
Peter C. Hauser,Susie S. S. Tan +1 more
TL;DR: In this article, a light-emitting diode and a photodiode are used for fiber-optic sensors, where the second arm of the cable guides fluorescent light from the membrane back to the detector.