(19)

(11)

EP 1 002 230 A1

(12)

(43) Date of publication: 24.05.2000 Bulletin 2000/21 (21) Application number: 98937671.0 (22) Date of filing: 05.08.1998

(51) International Patent Classification (IPC)7: G01N 27/66 (86) International application number: PCT/GB9802/354 (87) International publication number: WO 9908/102 (18.02.1999 Gazette 1999/07)

(84) Designated Contracting States: CH DE FR GB IT LI (30) Priority: 07.08.1997 GB 9716701 (71) Applicant: The Secretary of State for Defence Farnborough,Hampshire GU14 0LX (GB)	(72) Inventor: JONES, Christopher, David Salisbury,Wiltshire SP4 0JQ (GB) (74) Representative: Bowdery, Anthony Oliver  D/IPR (DERA) Formalities,Poplar 2,MOD Abbey Wood#19 Bristol BS34 8JH Bristol BS34 8JH (GB)