Increased sensitivity of long period grating hydrogen sensors through coupling to higher order cladding modes

Richard M. Carter, Robert R. J. Maier, Palas Biswas, Somnath Bandyopadhyay, Nandini Basumallick, Benjamin J. S. Jones, Scott McCulloch, James S. Barton

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish
Title of host publication22ND INTERNATIONAL CONFERENCE ON OPTICAL FIBER SENSORS, PTS 1-3
EditorsY Liao, W Jin, DD Sampson, R Yamauchi, Y Chung, K Nakamura, Y Rao
Place of PublicationBELLINGHAM
PublisherSPIE
Number of pages4
DOIs
Publication statusPublished - 2012
Event22nd International Conference on Optical Fiber Sensors (OFS) - Beijing, United Kingdom
Duration: 15 Oct 201219 Oct 2012

Publication series

NameProceedings of SPIE
PublisherSPIE-INT SOC OPTICAL ENGINEERING
Volume8421
ISSN (Print)0277-786X

Conference

Conference22nd International Conference on Optical Fiber Sensors (OFS)
CountryUnited Kingdom
Period15/10/1219/10/12

Keywords

  • Palladium
  • LPG
  • Hydrogen
  • Fiber Optic
  • Sensor

Cite this

Carter, R. M., Maier, R. R. J., Biswas, P., Bandyopadhyay, S., Basumallick, N., Jones, B. J. S., McCulloch, S., & Barton, J. S. (2012). Increased sensitivity of long period grating hydrogen sensors through coupling to higher order cladding modes. In Y. Liao, W. Jin, DD. Sampson, R. Yamauchi, Y. Chung, K. Nakamura, & Y. Rao (Eds.), 22ND INTERNATIONAL CONFERENCE ON OPTICAL FIBER SENSORS, PTS 1-3 (Proceedings of SPIE; Vol. 8421). SPIE. https://doi.org/10.1117/12.975217