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    • 1. 发明授权
    • Seismic sources
    • 地震源
    • US5131488A
    • 1992-07-21
    • US303093
    • 1989-01-26
    • Michael A. GreenNeville G. W. CookThomas V. McEvillyErnest L. MajerPaul A. Witherspoon
    • Michael A. GreenNeville G. W. CookThomas V. McEvillyErnest L. MajerPaul A. Witherspoon
    • G01V1/40G01V1/143G01V1/155G01V11/00
    • G01V1/155G01V11/005
    • Apparatus is described for placement in a borehole in the earth, which enables the generation of closely controlled seismic waves from the borehole. Pure torsional shear waves are generated by an apparatus which includes a stator element fixed to the borehole walls and a rotor element which is electrically driven to rapidly oscillate on the stator element to cause reaction forces transmitted through the borehole walls to the surrounding earth. Logitudinal shear waves are generated by an armature that is driven to rapidly oscillate along the axis of the borehole relative to a stator that is clamped to the borehole, to cause reaction forces transmitted to the surrounding earth. Pressure waves are generated by electrically driving pistons that press against opposite ends of a hydraulic reservoir that fills the borehole. High power is generated by energizing the elements at a power level that causes heating to over 150.degree. C. within one minute of operation, but energizing the elements for no more than about one minute.
    • 描述了用于放置在地球钻孔中的装置,这使得能够从井眼产生严格受控的地震波。 纯扭转剪切波由包括固定在钻孔壁上的定子元件和电驱动的转子元件的装置产生,该转子元件在定子元件上快速振荡,以使反作用力通过钻孔壁传递到周围的地球。 纵向剪切波由电枢产生,该电枢被驱动以相对于被夹持在钻孔上的定子沿着钻孔的轴线快速振荡,以产生传递到周围地球的反作用力。 通过电动驱动活塞产生压力波,该活塞压在填充钻孔的液压储存器的相对端。 通过在一分钟的操作期间使加热到150℃以上的功率水平激发元件而产生高功率,但是对元件通电不超过约1分钟。