S
S. Thomas Lee
Researcher at Cochin University of Science and Technology
Publications - 8
Citations - 235
S. Thomas Lee is an academic researcher from Cochin University of Science and Technology. The author has contributed to research in topics: Fiber optic sensor & Optical fiber. The author has an hindex of 7, co-authored 8 publications receiving 233 citations.
Papers
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Journal ArticleDOI
A sensitive fibre optic pH sensor using multiple sol-gel coatings
S. Thomas Lee,Jose Gin,V. P. N. Nampoori,C. P. G. Vallabhan,N.V. Unnikrishnan,P. Radhakrishnan +5 more
TL;DR: In this article, the fabrication and characterization of a fiber optic pH sensor based on evanescent wave absorption is presented, where the unclad portion of a multi-mode optical fiber is coated with a pH sensitive dye, which is immobilized by the sol-gel route.
Journal ArticleDOI
A microbent fiber optic pH sensor
TL;DR: In this paper, a permanently microbent portion of a plastic optic fiber is coated with a thin film of dye impregnated sol-gel material, and measurements are simultaneously carried out in two independent detection schemes.
Journal ArticleDOI
Long period gratings in multimode optical fibers: application in chemical sensing
S. Thomas Lee,R Dinesh Kumar,P. Suresh Kumar,P. Radhakrishnan,C. P. G. Vallabhan,V. P. N. Nampoori +5 more
TL;DR: In this paper, the authors proposed and demonstrated a new technique for evanescent wave chemical sensing by writing long period gratings in a bare multimode plastic clad silica fiber.
Journal ArticleDOI
Design and development of an LED based fiber optic evanescent wave sensor for simultaneous detection of chromium and nitrite traces in water
TL;DR: In this article, a cost-effective, simple, sensitive and portable LED based fiber optic evanescent wave sensor for simultaneously detecting trace amounts of chromium and nitrite in water is presented.
Journal ArticleDOI
Evanescent wave fibre optic sensors for trace analysis of Fe3+ in water
S. Thomas Lee,P. Suresh Kumar,K. P. Unnikrishnan,V. P. N. Nampoori,C. P. G. Vallabhan,Sankaran Sugunan,P. Radhakrishnan +6 more
TL;DR: In this paper, two types of FOS are developed; one type uses the unclad portion of a multimode silica fibre as the sensing region whereas the other employs the microbent portion of multimode plastic fibre as a sensing region.