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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.

7.5.3 pH sensor based on tilted fiber Bragg gratings covered by a sol-gel