(19)

(11)

EP 2 307 865 A1

(12)

(43) Date of publication: 13.04.2011 Bulletin 2011/15 (21) Application number: 09790079.9 (22) Date of filing: 06.07.2009

(51) International Patent Classification (IPC):  G01K 1/16(2006.01) (86) International application number: PCT/US2009/049694 (87) International publication number: WO 2010/014354 (04.02.2010 Gazette 2010/05)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR Designated Extension States: AL BA RS (30) Priority: 31.07.2008 GB 0813994 (71) Applicant: GE Infrastructure Sensing, Inc. 01821 MA Billerica (US)	(72) Inventor: BROWN, Roderick, Gordon Nottingham NG3 5EN (GB) (74) Representative: Illingworth-Law, William Illingworth  Global Patent Operation - Europe GE International Inc. 15 John Adam Street London WC2N 6LU London WC2N 6LU (GB)