(19)

(11)

EP 1 766 658 A2

(12)

(88) Date of publication A3: 07.12.2006 (43) Date of publication: 28.03.2007 Bulletin 2007/13 (21) Application number: 05754363.9 (22) Date of filing: 07.06.2005

(51) International Patent Classification (IPC):  H01J 43/24(2006.01) G01T 1/29(2006.01) (86) International application number: PCT/GB2005/002224 (87) International publication number: WO 2005/122213 (22.12.2005 Gazette 2005/51)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR LV MK YU (30) Priority: 08.06.2004 GB 0412686 (71) Applicant: University of Wales, Aberystwyth Penglais Aberystwyth, Ceredigion SY23 3DD (GB)	(72) Inventors: LANGSTAFF, David Clarach, Aberystwyth SY23 3DH (GB) BIRKINSHAW, Keith Taliesin, Ceredigion SY20 8JH (GB) (74) Representative: Strachan, Victoria Jane  Urquhart-Dykes & Lord LLP Churchill House Churchill Way Cardiff CF10 2HH Cardiff CF10 2HH (GB)