(19)

(11)

EP 0 282 548 A1

(12)

(43) Date of publication: 21.09.1988 Bulletin 1988/38 (21) Application number: 87906141.0 (22) Date of filing: 03.09.1987

(51) International Patent Classification (IPC):  G01B 11/ 00( . ) G01D 3/ 028( . ) G01S 5/ 16( . ) G01B 11/ 16( . ) G01M 5/ 00( . ) (86) International application number: PCT/US1987/002214 (87) International publication number: WO 1988/001734 (10.03.1988 Gazette 1988/06)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 03.09.1986 US 19860903366 (71) Applicant: GRUMMAN AEROSPACE CORPORATION Bethpage, NY 11714 (US)	(72) Inventors: HAMPTON, Herbert, R. Hauppauge, NY 11787 (US) FODALE, Robert Massapequa, NY 11758 (US) CONKLING, Charles, R., Jr. Shoreham, NY 11786 (US) (74) Representative: Armengaud Ainé, Alain, et al  Cabinet ARMENGAUD AINE 3 Avenue Bugeaud F-75116 Paris F-75116 Paris (FR)