7.5.3 pH sensor based on tilted fiber Bragg gratings covered by a sol-gel
- Event
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
Nürnberg/Nuremberg, Germany - Chapter
- 7.5 Chemical Sensors using Optical Technologies
- Author(s)
- M. Debliquy, J. Renoit, M. Olivier - Material Science Department, University of Mons, P. Mégret - Electromagnetism and Telecommunications Department, University of Mons
- Pages
- 652 - 654
- DOI
- 10.5162/IMCS2012/7.5.3
- ISBN
- 978-3-9813484-2-2
- Price
- free
Abstract
This paper presents the development of a pH sensor based on a Tilted Fiber Bragg Grating (TFBG) covered with a microporous coating consisting of bromophenol blue (pH indicator) encapsulated in a silica sol-gel matrix. The covered TFBG shows important modifications of its transmission amplitude spectrum in the range of 1510-1590 nm as a function of the pH. All the cladding mode resonances show a peak-to-peak amplitude decrease with increasing pH according to a sigmoidal evolution. The response, defined as the change in amplitude of a resonance peak as a function of the pH, is fast (<10s) and reversible. The amplitude change between acidic and basic forms is about 4 dB at 1550 nm. This kind of sensor could be of interest for practical applications such as corrosion monitoring.