(19)

(11)

EP 0 846 252 A1

(12)

(43) Date of publication: 10.06.1998 Bulletin 1998/24 (21) Application number: 96928780.0 (22) Date of filing: 21.08.1996

(51) International Patent Classification (IPC):  G01F 23/ 14( . ) G01F 23/ 16( . ) (86) International application number: PCT/SE1996/001040 (87) International publication number: WO 1997/008517 (06.03.1997 Gazette 1997/11)

(84) Designated Contracting States: DE DK ES FI FR GR IT NL (30) Priority: 23.08.1995 SE 19950002919 (71) Applicant: Kockum Sonics Aktiebolag S-212 10 Malmö (SE)	(72) Inventor: WERTHAJM, Marek S-211 41 Malmö (SE) (74) Representative: Larsen, Stig  Allégatan 28 234 00 Lomma 234 00 Lomma (SE)