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Authors: A. Casas Bedoya, M.Y. Ling, J. Brouckaert, N.A Yebo, D. Van Thourhout, R. Baets
Title: Biodiesel sensing using Silicon-on-Insulator technologies
Format: International Conference Proceedings
Publication date: 5/2009
Journal/Conference/Book: SPIE europe, Microtechnologies for the new millenium
Editor/Publisher: SPIE europe, 
Location: Dresden, Germany
DOI: 10.1117/12.821508
Citations: 4 ( - last update: 14/7/2024)
3 (OpenCitations - last update: 3/5/2024)
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By measuring the transmission of Biodiesel/Diesel mixtures in the near- and far-infrared wavelength ranges, it is possible to predict the blend level with a high accuracy. Conventional photospectrometers are typically large and expensive and have a performance that often exceeds the requirements for most applications. For automotive applications for example, what counts is size, robustness and most important cost. As a result the miniaturization of the
spectrometer can be seen as an attractive implementation of a Biodiesel sensor. Using Silicon-on-Insulator (SOI) this spectrometer miniaturization can be achieved. Due to the large refractive index
contrast of the SOI material system, photonic devices can be made very compact. Moreover, they can be manufactured on high-quality SOI substrates using waferscale CMOS fabrication tools, making them cheap for the market. In this paper, we show that it is possible to determine Biodiesel blend levels using an SOI spectrometer-on-a-chip. We demonstrate absorption measurements using spiral shaped waveguides and we also present the spectrometer design for on-chip Biodiesel blend level measurements.

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