LED-based long-period gratings for chloride detection

Abraham Vamattathil Scaria; Thomas S. Lee; P. Suresh Kumar; A. Santhi; C. P. Girijavallabhan; V. P. N. Nampoori; P. Radhakrishnan

doi:10.1117/12.520555

30 April 2004 LED-based long-period gratings for chloride detection

Abraham Vamattathil Scaria, Thomas S. Lee, P. Suresh Kumar, A. Santhi, C. P. Girijavallabhan, V. P. N. Nampoori, P. Radhakrishnan

Author Affiliations +

Proceedings Volume 5279, Optical Fibers and Passive Components; (2004) https://doi.org/10.1117/12.520555
Event: Asia-Pacific Optical and Wireless Communications, 2003, Wuhan, China

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.

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Abraham Vamattathil Scaria, Thomas S. Lee, P. Suresh Kumar, A. Santhi, C. P. Girijavallabhan, V. P. N. Nampoori, and P. Radhakrishnan "LED-based long-period gratings for chloride detection", Proc. SPIE 5279, Optical Fibers and Passive Components, (30 April 2004); https://doi.org/10.1117/12.520555

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