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Proceedings Paper

LED-based long-period gratings for chloride detection
Author(s): Abraham Vamattathil Scaria; Thomas S. Lee; P. Suresh Kumar; A. Santhi; C. P. Girijavallabhan; V. P. N. Nampoori; P. Radhakrishnan
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Paper Abstract

In the present study, we report the design and development of a cost-effective, simple, sensitive LED - based fiber optic sensor for detecting trace amounts of chloride ions in water. A multimode plastic clad silica (PCS) fiber with the cladding removed and long period grating (LPG) written on its middle region acts as the sensing element. Exposure of the sensing region to water samples containing spectroscopic reagents for the detection of chloride ions causes evanescent wave absorption, which increases with increase in concentration. The limit of detection of the sensor is found to be a few parts per billion and the operational range covers more than five orders of magnitude.

Paper Details

Date Published: 30 April 2004
PDF: 4 pages
Proc. SPIE 5279, Optical Fibers and Passive Components, (30 April 2004); doi: 10.1117/12.520555
Show Author Affiliations
Abraham Vamattathil Scaria, Cochin Univ. of Science and Technology (India)
Thomas S. Lee, Cochin Univ. of Science and Technology (India)
P. Suresh Kumar, Cochin Univ. of Science and Technology (India)
A. Santhi, Cochin Univ. of Science and Technology (India)
C. P. Girijavallabhan, Cochin Univ. of Science and Technology (India)
V. P. N. Nampoori, Cochin Univ. of Science and Technology (India)
P. Radhakrishnan, Cochin Univ. of Science and Technology (India)


Published in SPIE Proceedings Vol. 5279:
Optical Fibers and Passive Components
Steven Shen; Shuisheng Jian; Katsunari Okamoto; Kenneth L. Walker, Editor(s)

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