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Proceedings Paper

Optical fiber grating sensor network for monitoring refractive index and temperature distributions in fluids
Author(s): Wolfgang Ecke; Kerstin Schroeder; Andrei Y. Andreev; Rudolf Mueller; Reinhardt Willsch
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Paper Abstract

In a fiber-optic multi-point sensor network basing on optical fiber Bragg gratings, simultaneous measurements of refractive indices and of temperature are performed. The Bragg wavelength of a side-polished fiber grating is determined by the refractive index of the surrounding fluid, and is measured using a high-resolving low-cost compact spectrometer. The influence of temperature is separated considering the temperature-induced Bragg wavelength shift in an adjacent non-polished part of the fiber grating. The sensor network can be applied for on-line process control in chemical, biochemical and petrol technologies, and for environmental and geotechnical monitoring, especially in flammable or corrosive surroundings, and in electromagnetic fields. A buffer layer between fiber core and analyte allows to adjust the sensor characteristic to appear with high sensitivity in the refractive index range of the interesting fluids.

Paper Details

Date Published: 13 October 1999
PDF: 8 pages
Proc. SPIE 3783, Optical Diagnostics for Fluids/Heat/Combustion and Photomechanics for Solids, (13 October 1999); doi: 10.1117/12.365735
Show Author Affiliations
Wolfgang Ecke, Institute for Physical High Technology (Germany)
Kerstin Schroeder, Institute for Physical High Technology (Germany)
Andrei Y. Andreev, Institute of Solid State Physics (Bulgaria) (Austria)
Rudolf Mueller, Institute for Physical High Technology (Germany)
Reinhardt Willsch, Institute for Physical High Technology (Germany)


Published in SPIE Proceedings Vol. 3783:
Optical Diagnostics for Fluids/Heat/Combustion and Photomechanics for Solids
Soyoung Stephen Cha; Peter John Bryanston-Cross; Carolyn R. Mercer, Editor(s)

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