Detection of organic aromatic compounds in paraffin by a long-period fiber grating optical sensor with optimized sensitivity

Thomas D.P. Allsop*, Lin Zhang, Ian Bennion

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

A long-period grating (LPG) sensor is used to detect small variations in the concentration of an organic aromatic compound (xylene) in a paraffin (heptane) solution. A new design procedure is adopted and demonstrated to maximize the sensitivity of LPG (wavelength shift for a change in the surrounding refractive index, (dλ/dn3)) for a given application. The detection method adopted is comparable to the standard technique used in industry (high performance liquid chromatograph and UV spectroscopy) which has a relative accuracy between ∼±0.5% and 5%. The minimum detectable change in volumetric concentration is 0.04% in a binary fluid with the detection system presented. This change of concentration relates to a change in refractive index of Δn ∼ 6 × 10-5. © 2001 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)181-190
Number of pages10
JournalOptics Communications
Volume191
Issue number3-6
Early online date1 May 2001
DOIs
Publication statusPublished - 8 May 2001

Keywords

  • long-period fiber grating
  • chemical sensing
  • mode coupling

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