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

Fingerprint

aromatic compounds
Aromatic compounds
Optical sensors
paraffins
optical measuring instruments
Paraffin
Paraffins
Refractive index
gratings
Heptanes
Xylenes
fibers
Fibers
sensitivity
Heptane
Xylene
Ultraviolet spectroscopy
refractivity
binary fluids
xylene

Keywords

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

Cite this

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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. {\circledC} 2001 Elsevier Science B.V.",
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Detection of organic aromatic compounds in paraffin by a long-period fiber grating optical sensor with optimized sensitivity. / Allsop, Thomas D.P.; Zhang, Lin; Bennion, Ian.

In: Optics Communications, Vol. 191, No. 3-6, 08.05.2001, p. 181-190.

Research output: Contribution to journalArticle

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