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Proceedings Paper

Refractive index sensing for online monitoring water and ethanol content in bio fuels
Author(s): S. Belle; S. Scheurich; R. Hellmann; S. So; I. J. G. Sparrow; G. D. Emmerson
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Paper Abstract

We report on a refractive index sensor based on a planar Bragg grating (PBG) capable to online monitor the water content in Biodiesel and the amount of ethanol admixture to conventional fuels, respectively. Our results demonstrate the capability of the sensor to distinguish the transition between about 190 and 500 ppm water in Biodiesel, enabling to monitor the production process of Biodiesel in the relevant range according to industrial standards. The ethanol content in petrol has been investigated in the range of 0-100%, covering the entire standardized range of E-5 to E-85 fuel mixing ratios. These experiments reveal a sensitivity of 112 nm/riu allowing the measurement of the ethanol content with a resolution of 8.9·10-6.

Paper Details

Date Published: 14 May 2010
PDF: 6 pages
Proc. SPIE 7726, Optical Sensing and Detection, 77261K (14 May 2010); doi: 10.1117/12.853849
Show Author Affiliations
S. Belle, Univ. of Applied Sciences (Germany)
S. Scheurich, Univ. of Applied Sciences (Germany)
R. Hellmann, Univ. of Applied Sciences (Germany)
S. So, Stratophase Ltd. (United Kingdom)
I. J. G. Sparrow, Stratophase Ltd. (United Kingdom)
G. D. Emmerson, Stratophase Ltd. (United Kingdom)


Published in SPIE Proceedings Vol. 7726:
Optical Sensing and Detection
Francis Berghmans; Anna Grazia Mignani; Chris A. van Hoof, Editor(s)

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