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    Downhole acoustic transducer
    1.
    发明公开
    Downhole acoustic transducer 失效
    Akustischer Wandlerfürein Bohrloch。

    公开(公告)号：EP0485261A1

    公开(公告)日：1992-05-13

    申请号：EP91402921.0

    申请日：1991-10-31

    申请人： SCHLUMBERGER LIMITED ,  SCHLUMBERGER TECHNOLOGY B.V. ,  SCHLUMBERGER HOLDINGS LIMITED

    发明人： Ounadjela, Abderrhamane

    IPC分类号： G01V1/145 ,  G10K9/12

    CPC分类号： G01V1/145 ,  G10K9/121

    摘要： An acoustic transducer comprises two pairs of opposite elongate segments (20) placed inside a deformable tube (14). Drive means (22) operable to expand in a direction orthogonal to the axis of the tube are disposed between the segments of each pair. The drive means occupy a substantial portion of the inside volume of the tube. A preferred arrangement includes drive means for a pair of segments longitudinally displaced from the drive means for the other pair. Drive means may be constituted by stacks of piezoelectric pellets (24) extending radially relative to the axis of the tube. A pressure compensation system is provided to keep the pressure inside the tube (14) substantially equal to the external pressure. Longitudinal flutes (14a) are formed inside the tube (14) between the segments (20) to facilitate tube deformation and amplify volume variation.

    摘要翻译： 声换能器包括放置在可变形管（14）内的两对相对的细长段（20）。 驱动装置（22）可操作以在与管的轴线垂直的方向上膨胀，布置在每对的段之间。 驱动装置占据管的内部容积的大部分。 优选的布置包括用于一对分段的驱动装置，所述一对分段从另一对的驱动装置纵向移位。 驱动装置可以由相对于管的轴线径向延伸的压电颗粒（24）的堆叠构成。 提供压力补偿系统以保持管（14）内的压力基本上等于外部压力。 在管（20）内的管（14）内部形成纵向凹槽（14a），以便于管变形并放大体积变化。