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Proceedings Paper

Interferometric fibre-optic sensor for acetic acid measurement
Author(s): C. Jesus; S. F. O. Silva; M. Castanheira; G. Gonzalez Aguilar; O. Frazao; P. A. S. Jorge; J. M. Baptista
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Paper Abstract

An optical fibre sensor for determination of acetic acid is presented. The sensing probe is based on a fiber Bragg grating (FBG) Fabry-Perot cavity, coated with a thin film of sol-gel-PVP (polyVynil Pirrolidone) composite material. The polymeric thin film renders interferometric output sensitive to the presence of carboxylic acid species. Results show that the wavelength of the interferometric peaks change with acetic acid concentration, enabling its quantification. Coupling the fibre probe with a serrodyne modulated readout interferometer enables pseudo-heterodyne interrogation and the detection of acetic acid with a sensitivity of 1 deg/0.01% and a resolution of 0.2% v/v. The results demonstrate the potential of the proposed scheme to operate as a sensitive chemical sensor platform.

Paper Details

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75031A (5 October 2009); doi: 10.1117/12.835145
Show Author Affiliations
C. Jesus, INESC Porto (Portugal)
Univ. of Madeira (Portugal)
S. F. O. Silva, INESC Porto (Portugal)
Univ. do Porto (Portugal)
M. Castanheira, INESC Porto (Portugal)
G. Gonzalez Aguilar, INESC Porto (Portugal)
O. Frazao, INESC Porto (Portugal)
Univ. do Porto (Portugal)
P. A. S. Jorge, INESC Porto (Portugal)
J. M. Baptista, INESC Porto (Portugal)
Univ. da Madeira (Portugal)

Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors
Julian D. C. Jones, Editor(s)

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