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Titre du document / Document title

Optical transmission of PMMA optical fibres exposed to high intensity UVA and visible blue light

Auteur(s) / Author(s)

ALOBAIDANI A. D. (1) ; FURNISS D. (2) ; JOHNSON M. S. (1) ; ENDRUWEIT A. (1) ; SEDDON A. B (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, ROYAUME-UNI
(2) Wolfson Centre for Material Research, University Park, Nottingham NG7 2RD, ROYAUME-UNI

Résumé / Abstract

Optical transmission of PMMA (polymethylmethacrylate) POF (polymer optical fibre) in the spectral range from 280 to 450 nm is investigated with a high radiation emission source comprising a mercury lamp delivering 40 W/cm2 at the PMMA POF launch face. The heat generated from the radiation source causes a sudden drop in the launched radiation due to thermal-oxidation and photo-degradation of the launch face of the PMMA POF; this results in a loss of 53% of the total launched power within 13 min of exposure to the source. The thermal-oxidation degradation is controlled by a cooling device which improves the transmission stability of the fibre. However, photo-degradation is still active and causes a loss in power of 7% in 13 min. The spectral output of the transmitted radiation through the PMMA POF was monitored and indicates the variation in optical loss with wavelength. High rates of nominal absorption for the irradiated PMMA POF are found below 320 nm wavelength. From the Beer-Lambert law, the photo-degradation effect with time of a fixed path length of PMMA POF is described by the absorption coefficient (αλ, cm-1). The nominal absorption coefficient αλ values in the range 335-368 nm wavelength are found to be higher after 1 h of irradiation than the values in the range 406-438 nm. However, the relative change in the nominal absorption coefficient Δαλ is greater at 438 nm than at 335 nm, 368 or 406 nm. After 1 h of irradiation with the cooling device in place, the PMMA POF transmission was reduced to 44.8% of its initial value; this recovered to a maximum of 86% of the original transmission of the total launched power after 5 weeks in ambient conditions.

Revue / Journal Title

Optics and lasers in engineering    ISSN  0143-8166   CODEN OLENDN 

Source / Source

2010, vol. 48, no5, pp. 575-582 [8 page(s) (article)] (31 ref.)

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Kidlington, ROYAUME-UNI  (1980) (Revue)

Mots-clés anglais / English Keywords

Polymer fibers

;

PMMA

;

Optical fibers

;

Optical properties

;

Absorption coefficients

;

Ultraviolet radiation

;

Blue light

;

Visible radiation

;

Ultraviolet irradiation

;

Radiation sources

;

Optical losses

;

Oxidation

;

Mots-clés français / French Keywords

4281C

;

Fibre polymère

;

Méthacrylate de méthyle polymère

;

Fibre optique

;

Propriété optique

;

Coefficient absorption

;

Rayonnement UV

;

Lumière bleue

;

Rayonnement visible

;

Irradiation UV

;

Source rayonnement

;

Perte optique

;

Oxydation

;

Mots-clés espagnols / Spanish Keywords

Luz azul

;

Irradiación UV

;

Mots-clés d'auteur / Author Keywords

PMMA optical fibres

;

Optical transmission

;

Emission spectrum

;

Photo-degradation

;

Thermo-oxidative stability

;

Ultraviolet radiation

;

Localisation / Location

INIST-CNRS, Cote INIST : 18813, 35400018146085.0100

Nº notice refdoc (ud4) : 22529553



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