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    • 7. 发明授权
    • Rock extensometer
    • 岩石伸展计
    • US5629480A
    • 1997-05-13
    • US500156
    • 1995-07-10
    • Gerhard Herget
    • Gerhard Herget
    • E21B47/04E21B47/08
    • E21B47/08E21B47/01
    • An extensometer for use in a borehole comprises a combination of linear motion transducers located with daisy wheel anchors, which may be attached together if desired with extension bars. Linkages are used to connect the transducers to the daisy wheel anchors. The transducers are set up to measure distance changes both axially along the hole or radially. The extensometer includes at least one axially measuring transducer, and at least two radially measuring transducers. The transducers change in value according to changes in borehole dimensions; the transducer values are monitored electrically.
    • 用于钻孔的引伸计包括定位于菊花轮锚固件上的直线运动传感器的组合,如果需要,可以将其连接在一起,具有延伸杆。 连接用于将传感器连接到菊花轮锚定器。 传感器被设置成沿轴孔或径向测量距离变化。 引伸计包括至少一个轴向测量换能器和至少两个径向测量换能器。 传感器根据钻孔尺寸的变化而变化值; 电传感器值被监控。