(19)

(11)

EP 0 720 738 A1

(12)

(43) Date of publication: 10.07.1996 Bulletin 1996/28 (21) Application number: 94924914.0 (22) Date of filing: 22.08.1994

(51) International Patent Classification (IPC):  G01N 27/ 12( . ) (86) International application number: PCT/GB1994/001832 (87) International publication number: WO 1995/008764 (30.03.1995 Gazette 1995/14)

(84) Designated Contracting States: AT CH DE FR GB LI NL SE (30) Priority: 23.09.1993 GB 19930019456 (71) Applicant: THE SECRETARY OF STATE FOR DEFENCE Farnborough, Hampshire GU14 6TD (GB)	(72) Inventors: WILSON, Alan Intellectual Property Dept. Hampshire GU14 6TD (GB) WRIGHT, John, Dalton Intellectual Property Dept. Hampshire GU14 6TD (GB) (74) Representative: Bowdery, Anthony Oliver, et al  Intellectual Property Department, R69 Building, Defence Evaluation & Research Agency Farnborough, Hampshire GU14 6TD Farnborough, Hampshire GU14 6TD (GB)