A large core polymer optical fibre sensor for x-ray dosimetry based on luminescence occurring in the cladding

Fitzpatrick, C. and O'Donoghue, C. and Schöbel, J. and Bastiaens, B. and Slot van der, P. and Lewis, E. and Pendrill, D. (2004) A large core polymer optical fibre sensor for x-ray dosimetry based on luminescence occurring in the cladding. Measurement Science and Technology, 15 . pp. 1586-1590. ISSN 0957-0233

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Abstract:	An optical fibre sensor for short pulse duration x-ray dosimetry is presented. The sensor is based on luminescence generated in the cladding of a 1 mm core diameter polymer optical fibre which has been doped with a radioluminescent phosphor. On interaction with x-rays, this phosphor emits visible light, part of which is coupled to the fibre core through a combination of surface roughness at the core¿cladding interface and through evanescent wave coupling of these guided waves. From here it is transmitted to an optoelectronic photodetector for monitoring. A 15 cm fibre sensor was used for the experiment which was conducted using a pulsed x-ray source normally employed for the preionization of excimer lasers. The results are calibrated against the emission intensity from a scintillating plastic block and a pen dosimeter. The peak output signal of the fibre sensor increases linearly with the dose produced by the x-ray source. There is also a discussion on the long-term stability of such a sensor, the expansion of this sensor into a multi-point device and methods to improve the efficiency of the luminescence coupling from cladding to core for large core polymer fibres included.
Item Type:	Article
Copyright:	© 2004 IOP
Faculty:	Science and Technology (TNW)
Research Group:	Laser Physics and Nonlinear Optics (LPNO)
Link to this item:	http://purl.utwente.nl/publications/47967
Official URL:	http://dx.doi.org/10.1088/0957-0233/15/8/027
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