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

Allsop, Thomas D.P., Zhang, Lin and Bennion, Ian (2001). Detection of organic aromatic compounds in paraffin by a long-period fiber grating optical sensor with optimized sensitivity. Optics Communications, 191 (3-6), pp. 181-190.

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.

Publication DOI: https://doi.org/10.1016/S0030-4018(01)01131-2
Divisions: Engineering & Applied Sciences > Electrical, electronic & power engineering
Engineering & Applied Sciences > Institute of Photonics
Uncontrolled Keywords: long-period fiber grating,chemical sensing,mode coupling,Atomic and Molecular Physics, and Optics
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Related URLs: http://www.scopus.com/inward/record.url?scp=0035826881&partnerID=8YFLogxK (Scopus URL)
Published Date: 2001-05-08
Authors: Allsop, Thomas D.P.
Zhang, Lin ( 0000-0002-1691-5577)
Bennion, Ian

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