Interferometric fibre-optic sensor for acetic acid measurement

C. Jesus; S. F. O. Silva; M. Castanheira; G. Gonzalez Aguilar; O. Frazao; P. A. S. Jorge; J. M. Baptista

doi:10.1117/12.835145

5 October 2009 Interferometric fibre-optic sensor for acetic acid measurement

C. Jesus, S. F. O. Silva, M. Castanheira, G. Gonzalez Aguilar, O. Frazao, P. A. S. Jorge, J. M. Baptista

Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 75031A (2009) https://doi.org/10.1117/12.835145
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

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.

Citation Download Citation

C. Jesus, S. F. O. Silva, M. Castanheira, G. Gonzalez Aguilar, O. Frazao, P. A. S. Jorge, and J. M. Baptista "Interferometric fibre-optic sensor for acetic acid measurement", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75031A (5 October 2009); https://doi.org/10.1117/12.835145

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