Fibre evanescent field absorption (FEFA): an optical fibre technique for measuring light absorption in turbid water samples

David Lamb, Yeremias Bunganaen, John Louis, Gerry Woolsey, Rod Oliver, Geoffrey White

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

An optical fibre technique for measuring the absorption of water-borne pigment in the present of significant suspended sediment concentration has been evaluated. Based on the absorption of the evanescent field of light propagating down a single glass (silica) fibre, the fibre evanescent field absorption (FEFA) technique has been demonstrated to be approximately 10-fold less sensitive to absorbing species than traditional bulk absorption methods. However, unlike traditional optical absorption measurements, the FEFA technique is insensitive to scattering by the suspended particles for particle concentrations expected in typical inland waters. A simple calculation estimates that this insensitivity persists for sediment concentrations up to 2000-fold those expected in Australian inland rivers. In addition to experimental results, a discussion of the potential operational use of this technique in measuring optical absorption properties of water containing suspended sediment is presented.
Original languageEnglish
Pages (from-to)533-543
Number of pages11
JournalMarine and Freshwater Research
Volume55
Issue number5
DOIs
Publication statusPublished - 2004

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