EVANESCENT-WAVE ABSORPTION BASED FIBER OPTIC PH SENSOR PREPARED BY DYE-DOPED SOL-GEL IMMOBILIZATION TECHNIQUE

Authors
GUPTA BD SHARMA DK
Citation
Bd. Gupta et Dk. Sharma, EVANESCENT-WAVE ABSORPTION BASED FIBER OPTIC PH SENSOR PREPARED BY DYE-DOPED SOL-GEL IMMOBILIZATION TECHNIQUE, Optics communications, 140(1-3), 1997, pp. 32-35
Citations number
23
Categorie Soggetti
Optics
Journal title
Optics communications → ACNP
ISSN journal
00304018
Volume
140
Issue
1-3
Year of publication
1997
Pages
32 - 35
Database
ISI
SICI code
0030-4018(1997)140:1-3<32:EABFOP>2.0.ZU;2-8
Abstract
A fiber optic pH sensor based on evanescent wave absorption is present ed. To prepare the probe a small length of the cladding is removed fro m 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 uncl ad portion of the fiber using sol-gel technology. The sensor response and its dynamic range are reported for phenol red, cresol red and brom ophenol blue dyes. The sol-gel process has been found to increase the dynamic range of the pH sensor. (C) 1997 Elsevier Science B.V.