Detection of organic aromatic compounds in paraffin by a long-period fiber grating optical sensor with optimized sensitivity
2001; Elsevier BV; Volume: 191; Issue: 3-6 Linguagem: Inglês
10.1016/s0030-4018(01)01131-2
ISSN1873-0310
AutoresT. Allsop, L. Zhang, I. Bennion,
Tópico(s)Mechanical and Optical Resonators
ResumoA 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.
Referência(s)