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Sensors 2009, 9(6), 4559-4571; doi:10.3390/s90604559

Characterization of Long-period Grating Refractive Index Sensors and Their Applications

Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science & Technology, Tsukuba Central 2, Tsukuba 305-8568, Japan
Author to whom correspondence should be addressed.
Received: 25 May 2009 / Revised: 6 June 2009 / Accepted: 9 June 2009 / Published: 10 June 2009
(This article belongs to the Section Chemical Sensors)
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The influence of grating length and bend radius of long-period gratings (LPGs) on refractive index sensing was examined. Sensitivity to refractive indexes smaller than that of silica could be enhanced by bending LPGs. Bent LPGs lost sensitivity to refractive indexes higher than that of silica, whereas a 20-mm-long LPG arranged in a straight line had considerable sensitivity. These experimental results demonstrated that the sensitivity characteristics of LPGs to refractive index could be controlled by grating length and bend radius. View Full-Text
Keywords: long-period grating; refractive index; spectral sensitivity long-period grating; refractive index; spectral sensitivity

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Tsuda, H.; Urabe, K. Characterization of Long-period Grating Refractive Index Sensors and Their Applications. Sensors 2009, 9, 4559-4571.

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