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Proceedings Paper

Spectroscopy Of Fluids Using Evanescent Wave Absorption On Multimode Fiber
Author(s): V. Ruddy; B. MacCraith; J. A. Murphy
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Paper Abstract

Evanescent wave spectroscopy at the surface of the core of a section of multimode plastic clad silica (PCS) fiber located centrally along a length of fiber is described. High sensitivity is achieved by the launching of tunneling modes. The absorbance of Methylene Blue is found to vary linearly with the exposed length of fiber core and to show a square root dependence on solution concentration over two orders of magnitude of the latter. This is attributed to adsorption of the dye on the surface of the fiber core.

Paper Details

Date Published: 13 February 1990
PDF: 11 pages
Proc. SPIE 1172, Chemical, Biochemical, and Environmental Fiber Sensors, (13 February 1990); doi: 10.1117/12.963176
Show Author Affiliations
V. Ruddy, Dublin City University (Ireland)
B. MacCraith, Dublin City University (Ireland)
J. A. Murphy, British Gas plc (United Kingdom)

Published in SPIE Proceedings Vol. 1172:
Chemical, Biochemical, and Environmental Fiber Sensors
Robert A. Lieberman; Marek T. Wlodarczyk, Editor(s)

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