TY - JOUR
T1 - A large core polymer optical fibre sensor for x-ray dosimetry based on luminescence occurring in the cladding
AU - Fitzpatrick, C.
AU - O'Donoghue, C.
AU - Schöbel, J.
AU - Bastiaens, B.
AU - van der Slot, P.
AU - Lewis, E.
AU - Pendrill, D.
PY - 2004/8
Y1 - 2004/8
N2 - 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.
AB - 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.
KW - Cladding luminescence
KW - Optical fibre x-ray sensor
KW - Polymer optical fibre sensor
KW - X-ray dosimetry
KW - X-ray sensor
UR - http://www.scopus.com/inward/record.url?scp=4043074998&partnerID=8YFLogxK
U2 - 10.1088/0957-0233/15/8/027
DO - 10.1088/0957-0233/15/8/027
M3 - Article
AN - SCOPUS:4043074998
SN - 0957-0233
VL - 15
SP - 1586
EP - 1590
JO - Measurement Science and Technology
JF - Measurement Science and Technology
IS - 8
ER -