S Thomas Lee et al 2001 J. Opt. A: Pure Appl. Opt. 3 355 doi:10.1088/1464-4258/3/5/307
S Thomas Lee1, Jose Gin2, V P N Nampoori1, C P G Vallabhan1, N V Unnikrishnan2 and P Radhakrishnan1
Show affiliationsThe fabrication and characterization of a fibre optic pH sensor based on evanescent wave absorption is presented. The unclad portion of a multi-mode optical fibre is coated with a pH sensitive dye, which is immobilized by the sol-gel route. The sensitivity of the device has been found to increase when multiple sol-gel coatings are used as the sensing region. The dynamic range and the temporal response of the sensor are investigated for two different dyes, namely bromocresol purple and bromocresol green. The performance of the device is evaluated in terms of the results obtained during actual measurements.
42.81.Bm Fabrication, cladding, and splicing
82.80.Yc Rutherford backscattering (RBS), and other methods of chemical analysis
Optics, quantum optics and lasers
Issue 5 (September 2001)
Received 16 March 2001, in final form 29 May 2001
Published 12 July 2001
S Thomas Lee et al 2001 J. Opt. A: Pure Appl. Opt. 3 355
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