| 摘要 |
PCT No. PCT/FR85/00191 Sec. 371 Date Mar. 12, 1986 Sec. 102(e) Date Mar. 12, 1986 PCT Filed Jul. 11, 1985.Arrangement for the ultrasonic examination of objects by a local immersion technique, comprising: a source of liquid, a pump fed by said source, a coupling head fed with liquid by said pump and capable of directing towards the object to be examined a jet of the said liquid and a beam of ultrasonic waves which is contained in said jet and is coaxial with this jet, said coupling head comprising: (a) a first tranquilization chamber connected to the outlet of said pump, (b) a second cylindrical tranquilization chamber connected to the said first chamber by at least one channel for the passage of the liquid, (c) an ultrasonic transducer capable of emitting a beam of ultrasonic waves by means of an active surface, which is directed towards the object, said active surface being situated in the second chamber, centered on the axis of said second chamber and perpendicular to this axis, (d) a converging system coaxial with the said second chamber, the shape of which results from a calculation for the purpose of reducing or eliminating turbulence, and the outlet of which is placed at the end of the Fresnel zone relative to the transducer. |
