Evanescent wave absorption based fiber optic pH sensor prepared by dye doped sol-gel immobilization technique
1997; Elsevier BV; Volume: 140; Issue: 1-3 Linguagem: Inglês
10.1016/s0030-4018(97)00162-4
ISSN1873-0310
AutoresBanshi D. Gupta, Dinesh Kumar Sharma,
Tópico(s)Conducting polymers and applications
ResumoA fiber optic pH sensor based on evanescent wave absorption is presented. To prepare the probe a small length of the cladding is removed from the middle portion of the fiber. A thin porous film of glass with pH-sensitive dye entrapped in it is deposited on the surface of the unclad portion of the fiber using sol-gel technology. The sensor response and its dynamic range are reported for phenol red, cresol red and bromophenol blue dyes. The sol-gel process has been found to increase the dynamic range of the pH sensor.
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