Optical fiber grating sensor network for monitoring refractive index and temperature distributions in fluids

Wolfgang Ecke; Kerstin Schroeder; Andrei Y. Andreev; Rudolf Mueller; Reinhardt Willsch

doi:10.1117/12.365735

13 October 1999 Optical fiber grating sensor network for monitoring refractive index and temperature distributions in fluids

Wolfgang Ecke, Kerstin Schroeder, Andrei Y. Andreev, Rudolf Mueller, Reinhardt Willsch

Author Affiliations +

Proceedings Volume 3783, Optical Diagnostics for Fluids/Heat/Combustion and Photomechanics for Solids; (1999) https://doi.org/10.1117/12.365735
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

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.

Citation Download Citation

Wolfgang Ecke, Kerstin Schroeder, Andrei Y. Andreev, Rudolf Mueller, and Reinhardt Willsch "Optical fiber grating sensor network for monitoring refractive index and temperature distributions in fluids", Proc. SPIE 3783, Optical Diagnostics for Fluids/Heat/Combustion and Photomechanics for Solids, (13 October 1999); https://doi.org/10.1117/12.365735

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