Water-quality measurement using fiber optics at wavelengths below 230 nm

Karl-Friedrich Klein; H. Rode; Mathias Belz; William J. O. Boyle; Kenneth T. V. Grattan

doi:10.1117/12.260592

10 December 1996 Water-quality measurement using fiber optics at wavelengths below 230 nm

Karl-Friedrich Klein, H. Rode, Mathias Belz, William J. O. Boyle, Kenneth T. V. Grattan

Proceedings Volume 2836, Chemical, Biochemical, and Environmental Fiber Sensors VIII; (1996) https://doi.org/10.1117/12.260592
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

In the past, spectroscopic applications with fiber optics have been restricted to the wavelength range above 230 nm, because standard silica fibers with an undoped core and fluorine doped cladding are frequently damaged by exposure to UV-light, especially below 230 nm so quickly that stable UV-light transmission is impossible. Work on a fiber-optic sensor for water monitoring is presented here using an absorption cell and first solarization-reduced fiber samples for light-transportation: the main UV-band around 210 nm shows an induced loss of less than 0.3 dB/m. In this case it was possible to have the full output spectrum of a deuterium lamp at fiber endface, stable over time. Therefore, an optimized UV-lamp-fiber system, including commercially available components, has been developed and is reviewed in terms of performance in the wavelength region around 200 nm, in respect of an effective sensor approach for water a monitoring. In the following step, modification of the deuterium-lamp optics for optimized light coupling becomes more important, in order to maximize the optical power budget for this wavelength-region.

Citation Download Citation

Karl-Friedrich Klein, H. Rode, Mathias Belz, William J. O. Boyle, and Kenneth T. V. Grattan "Water-quality measurement using fiber optics at wavelengths below 230 nm", Proc. SPIE 2836, Chemical, Biochemical, and Environmental Fiber Sensors VIII, (10 December 1996); https://doi.org/10.1117/12.260592

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