Sensing Features of Long Period Gratings in Hollow Core Fibers

Sensors

Agostino Iadicicco¹  Stefania Campopiano² 

[1] id="af1-sensors-15-08009">Engineering Department, University of Naples “Parthenope”, Centro Direzionale Isola C4, 80143 Napoli, Ita

关键词: long period grating;    hollow core fiber;    pressure sensing;    strain sensing;    electric arc discharge;   

DOI  :  10.3390/s150408009

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.