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(11)

EP 1 991 879 A1

(12)

(43) Date of publication: 19.11.2008 Bulletin 2008/47 (21) Application number: 07712616.7 (22) Date of filing: 08.03.2007

(51) International Patent Classification (IPC):  G01R 11/02(2006.01) G01R 22/06(2006.01) B81B 3/00(2006.01) G01R 11/32(2006.01) G01R 21/06(2006.01) H01G 5/18(2006.01) B81B 7/02(2006.01) G01R 17/08(2006.01) (86) International application number: PCT/FI2007/050126 (87) International publication number: WO 2007/101916 (13.09.2007 Gazette 2007/37)

(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 LV MC MT NL PL PT RO SE SI SK TR (30) Priority: 09.03.2006 FI 20060233 (71) Applicant: VALTION TEKNILLINEN TUTKIMUSKESKUS 02150 Espoo (FI)	(72) Inventor: SEPPÄ, Heikki FI-00370 Helsinki (FI) (74) Representative: Lipsanen, Jari Seppo Einari  Seppo Laine Oy Itämerenkatu 3 B 00180 Helsinki 00180 Helsinki (FI)