Measurement of acetic acid using a fibre Bragg grating interferometer

• Type: Article in International Scientific Journal
• Date: 2009

Authors

Jesus, C (Author) Other; Susana Silva (Author) Other; Castanheira, M (Author) Other; GonzalezAguilar, G (Author) Other; Frazao, O (Author) Other; Jorge, PAS (Author) FCUP; Baptista, JM (Author) Other

Journal

Title: Measurement Science and Technology

Vol. 20

Final page: 125201

ISSN: 0957-0233

Publisher: Institute of Physics Publishing

Indexing

ISI Web of Knowledge - 5 Citations

Scopus - 7 Citations

Other information

Authenticus ID: P-003-E44

DOI: 10.1088/0957-0233/20/12/125201

Abstract (EN): An optical fibre sensor for determination of acetic acid is presented. The sensing probe is based on a fibre Bragg grating (FBG) Fabry-Perot cavity, coated with a thin film of sol-gel-PVP (polyvinylpyrrolidone) composite material. The polymeric thin film renders the interferometric output sensitive to the presence of carboxylic acid species. Results show that the wavelength of the interferometric peaks changes 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 92.6 deg/% L/L and a resolution of 0.2% L/L. The results demonstrate the potential of the proposed scheme to operate as a sensitive chemical sensor platform.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5