(19)

(11)

EP 0 386 061 A1

(12)

(43) Date of publication: 12.09.1990 Bulletin 1990/37 (21) Application number: 88909571.0 (22) Date of filing: 10.11.1988

(51) International Patent Classification (IPC):  G01N 15/ 02( . ) G01N 15/ 14( . ) (86) International application number: PCT/GB1988/000972 (87) International publication number: WO 1989/004470 (18.05.1989 Gazette 1989/11)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 10.11.1987 GB 19870026304 10.11.1987 GB 19870026305 10.11.1987 GB 19870026306 (71) Applicant: THE SECRETARY OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTY'S GOVERNMENT OF THE UNITED KINGDOM OF GREAT BRITAIN AND London WC1A 2HB (GB)	(72) Inventors: LUDLOW, Ian, Keith Welwyn Garden City Hertfordshire (GB) KAYE, Paul, Henry Hertfordshire (GB) EYLES, Nicholas, Alan Hertfordshire SG3 6BQ (GB) (74) Representative: Beckham, Robert William, et al  Defence Research Agency Intellectual Property Department DRA Farnborough Farnborough, Hants. GU14 6TD Farnborough, Hants. GU14 6TD (GB)