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Sensors 2015, 15(4), 8009-8019; doi:10.3390/s150408009

Sensing Features of Long Period Gratings in Hollow Core Fibers

Engineering Department, University of Naples "Parthenope", Centro Direzionale Isola C4, 80143 Napoli, Italy
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Author to whom correspondence should be addressed.
Academic Editor: Vittorio M.N. Passaro
Received: 12 February 2015 / Revised: 20 March 2015 / Accepted: 23 March 2015 / Published: 3 April 2015
(This article belongs to the Section Physical Sensors)
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Abstract

We report on the investigation of the sensing features of the Long-Period fiber Gratings (LPGs) fabricated in hollow core photonic crystal fibers (HC-PCFs) by the pressure assisted Electric Arc Discharge (EAD) technique. In particular, the characterization of the LPG in terms of shift in resonant wavelengths and changes in attenuation band depth to the environmental parameters: strain, temperature, curvature, refractive index and pressure is presented. The achieved results show that LPGs in HC-PCFs represent a novel high performance sensing platform for measurements of different physical parameters including strain, temperature and, especially, for measurements of environmental pressure. The pressure sensitivity enhancement is about four times greater if we compare LPGs in HC and standard fibers. Moreover, differently from LPGs in standard fibers, these LPGs realized in innovative fibers, i.e., the HC-PCFs, are not sensitive to surrounding refractive index. View Full-Text
Keywords: long period grating; hollow core fiber; pressure sensing; strain sensing; electric arc discharge long period grating; hollow core fiber; pressure sensing; strain sensing; electric arc discharge
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Iadicicco, A.; Campopiano, S. Sensing Features of Long Period Gratings in Hollow Core Fibers. Sensors 2015, 15, 8009-8019.

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