Title :
Fibre-optic evanescent-wave field fluid concentration sensor
Author :
Fabian, M. ; Lewis, E. ; Newe, T. ; Lochmann, S.
Author_Institution :
Dept. of Electron. & Comput. Eng., Univ. of Limerick, Limerick
Abstract :
A fibre-optic fluid concentration sensor based on refractive index measurements is reported. Its working principle is validated for some simple aqueous primary alcohol mixtures, such as Acetone, Ethanol, Methanol, 1-Propanol, and 2-Pro-panol, covering a concentration range from 0% vol to 10% vol. With a simple and low cost LED based measurement setup a resolution of about 0.00005 refractive index units was achie-ved, which approximately corresponds to 0.2% methanol, 0.75% ethanol and acetone, and 0.05% 1-propanol and 2-propanol. Moreover, described sensing method is applicable for all fluids that show different refractive indices at different concentrations, which by far is the case for almost all fluids, since the refractive index of a mixture is related to its density.
Keywords :
density; fibre optic sensors; refractive index measurement; 1-propanol; 2-propanol; LED; acetone; density; ethanol; fibre-optic evanescent-wave field fluid concentration sensor; methanol; refractive index measurements; Ethanol; Fuel cells; Methanol; Optical attenuators; Optical fiber sensors; Optical refraction; Optical sensors; Optical variables control; Probes; Refractive index; Refractive index; acetone; ethanol; me-thanol; n-propanol; optical fibre sensor;
Conference_Titel :
Systems, Signals and Devices, 2009. SSD '09. 6th International Multi-Conference on
Conference_Location :
Djerba
Print_ISBN :
978-1-4244-4345-1
Electronic_ISBN :
978-1-4244-4346-8
DOI :
10.1109/SSD.2009.4956701
