(19)

(11)

EP 0 485 410 A1

(12)

(43) Date of publication: 20.05.1992 Bulletin 1992/21 (21) Application number: 90910797.0 (22) Date of filing: 04.07.1990

(51) International Patent Classification (IPC):  G01N 1/ 34( . ) G01N 33/ 98( . ) G01N 31/ 22( . ) G01N 1/ 22( . ) (86) International application number: PCT/GB1990/001029 (87) International publication number: WO 1991/001001 (24.01.1991 Gazette 1991/03)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 06.07.1989 GB 19890015495 20.07.1989 GB 19890016570 08.03.1990 GB 19900005217 (71) Applicant: THE SECRETARY OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTY'S GOVERNMENT OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN London SW1A 2HB (GB)	(72) Inventor: WOODS, Stephen, Clifford 65 Chetnole Close Poole Dorset BH17 8BD (GB) (74) Representative: Beckham, Robert William  Defence Research Agency Intellectual Property Department DRA Farnborough Farnborough, Hants. GU14 6TD Farnborough, Hants. GU14 6TD (GB)