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Proceedings Paper

Refractive index sensor employing PVA-coated long period grating technology
Author(s): L. Alwis; K. Bremer; T. Sun; K. T. V. Grattan
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Paper Abstract

The sensitivity of a Long Period Grating (LPG)-based refractive index (RI) sensor has been enhanced through an appropriate coating of a thin polymer layer, with a higher RI than that of the cladding, on the LPG. The performance of the coated sensor, together with a bare LPG, was evaluated as a chemical sensor when the sodium chloride concentration in water varies from 0.01% to 2%. The corresponding attenuation band shifts of both sensors in response to the RI change were observed. The experimental results confirmed that the coated LPG sensor has higher sensitivity than that of the bare LPG sensor.

Paper Details

Date Published: 17 October 2012
PDF: 4 pages
Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84214I (17 October 2012); doi: 10.1117/12.974682
Show Author Affiliations
L. Alwis, City Univ. (United Kingdom)
K. Bremer, City Univ. (United Kingdom)
T. Sun, City Univ. (United Kingdom)
K. T. V. Grattan, City Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 8421:
OFS2012 22nd International Conference on Optical Fiber Sensors
Yanbiao Liao; Wei Jin; David D. Sampson; Ryozo Yamauchi; Youngjoo Chung; Kentaro Nakamura; Yunjiang Rao, Editor(s)

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