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Proceedings Paper

Increased sensitivity of long period grating hydrogen sensors through coupling to higher order cladding modes
Author(s): Richard M. Carter; Robert R. J. Maier; Palas Biswas; Somnath Bandyopadhyay; Nandini Basumallick; Benjamin J. S. Jones; Scott McCulloch; James S. Barton
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Paper Abstract

We investigate the phase matching conditions and sensitivities of higher order metal jacketed long period gratings (LPGs). These higher order modes have been previously demonstrated to have flatter, and therefore more sensitive, phase matching conditions leading up to the phase matching turning point. We demonstrate this increased sensitivity as applied to a Pd jacketed LPG hydrogen sensor illustrating an improvement in both the refractive index and temperature sensitivity (of the 17th order mode) of an order of magnitude over the lower order (1st-9th) modes.

Paper Details

Date Published: 7 November 2012
PDF: 4 pages
Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84216I (7 November 2012); doi: 10.1117/12.975217
Show Author Affiliations
Richard M. Carter, Heriot-Watt Univ. (United Kingdom)
Robert R. J. Maier, Heriot-Watt Univ. (United Kingdom)
Palas Biswas, Central Glass and Ceramics Research Institute (India)
Somnath Bandyopadhyay, Central Glass and Ceramics Research Institute (India)
Nandini Basumallick, Central Glass and Ceramics Research Institute (India)
Benjamin J. S. Jones, Atomic Weapons Establishment (United Kingdom)
Scott McCulloch, Atomic Weapons Establishment (United Kingdom)
James S. Barton, Heriot-Watt 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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