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Proceedings Paper

Ultrasensitive detection system for fiber optic-based ultraviolet spectroscopy
Author(s): Karl-Friedrich Klein; Mathias Belz; Peter Dress; B. Schelle; William J. O. Boyle; Kenneth T. V. Grattan; Hilmar Franke
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Paper Abstract

A fiber optic based deep UV-absorption sensor system is characterized, using fibers for light delivery and a liquid core waveguide (LCW) for analyzing liquids. UN-improved fibers with 500 micrometers core diameter are capable of transmitting light intensities below 230 nm with spectral radiant powers above 500 nW/nm at 214 nm. Their short-term behavior and lifetime in respect to UV-stability have been investigated, using a broadband deuterium lamp. To raise the sensitivity of the total system, the absorption path length has been increased significantly using the lightguiding properties of the LCW consisting of a cylindrical glass tube with a Teflon AF 2400 inner coating of about 50 micrometers thickness. Due to lower refractive index of Teflon in comparison to water, the LCW concept offers significant advantages, especially for long optical pathlengths. However, the basic attenuation of the liquid in dependence on the wavelength as to be taken into account. Results on the use of such a system monitoring concentrations of acetylsalicylic acid, acetone and toluene in water are reported and discussed.

Paper Details

Date Published: 26 March 1998
PDF: 7 pages
Proc. SPIE 3258, Micro- and Nanofabricated Structures and Devices for Biomedical Environmental Applications, (26 March 1998); doi: 10.1117/12.304365
Show Author Affiliations
Karl-Friedrich Klein, Fachhochschule Giessen-Friedberg (Germany)
Mathias Belz, City Univ. of London (United States)
Peter Dress, Gerhard-Mercartor-Univ. Duisburg (Germany)
B. Schelle, Gerhard-Mercartor-Univ. Duisburg (Germany)
William J. O. Boyle, City Univ. of London (United Kingdom)
Kenneth T. V. Grattan, City Univ. of London (United Kingdom)
Hilmar Franke, Gerhard-Mercartor-Univ. Duisburg (Germany)

Published in SPIE Proceedings Vol. 3258:
Micro- and Nanofabricated Structures and Devices for Biomedical Environmental Applications
Paul Lee Gourley, Editor(s)

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