(19)

(11)

EP 0 630 467 A1

(12)

(43) Date of publication: 28.12.1994 Bulletin 1994/52 (21) Application number: 94903970.0 (22) Date of filing: 10.01.1994

(51) International Patent Classification (IPC):  G01B 9/ 02( . ) G01D 5/ 48( . ) G01B 15/ 00( . ) G01J 9/ 04( . ) (86) International application number: PCT/GB1994/000039 (87) International publication number: WO 1994/016294 (21.07.1994 Gazette 1994/17)

(84) Designated Contracting States: CH DE FR LI (30) Priority: 13.01.1993 GB 19930000556 (71) Applicant: THE SECRETARY OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTY'S GOVERNMENT OF THE UNITED KINGDOM OF GREAT BRITAIN AND Farnborough, Hants. GU14 6TD (GB)	(72) Inventor: LEWIS, Meirion, Francis 5 Churchdown Road Worcestershire WR14 3JX (GB) (74) Representative: Beckham, Robert William, et al  Defence Research Agency Intellectual Property Department DRA Farnborough R69 Building Farnborough, Hants. GU14 6TD Farnborough, Hants. GU14 6TD (GB)