(19)

(11)

EP 0 968 401 A1

(12)

(43) Date of publication: 05.01.2000 Bulletin 2000/01 (21) Application number: 98910874.1 (22) Date of filing: 18.03.1998

(51) International Patent Classification (IPC)7: G01B 21/32, G01B 11/16 (86) International application number: PCT/GB9800/806 (87) International publication number: WO 9843/043 (01.10.1998 Gazette 1998/39)

(84) Designated Contracting States: DE DK ES FI FR GB GR IT NL SE (30) Priority: 21.03.1997 GB 9706032 (71) Applicant: THE SECRETARY OF STATE FOR DEFENCE Farnborough,Hampshire GU14 0LX (GB)	(72) Inventor: BROWN, James, CallanDera Rosyth DunfermlineFife KY11 2XR (GB) (74) Representative: Bowdery, Anthony Oliver et al D/IPD DERA FormalitiesA4 BuildingIvely Road Farnborough, Hants. GU14 OLX Farnborough, Hants. GU14 OLX (GB)