| 摘要 |
A method and apparatus are provided for detecting a received acoustic pulse of a selected azimuthal borehole mode in a liquid-containing borehole in a formation. The method uses a sonde having an axial array of acoustic receive r stations aligned with the borehole, each receiver station having an azimutha l array of at least four piezoelectric receiver elements, the receiver element s uniformly spaced apart around the azimuthal array. An acoustic pulse transmitted within the borehole produces an electrical signal at each receiv er element. Azimuthal spatial transform filtering is applied to produce data representing a received acoustic pulse of the selected azimuthal borehole mode. In one embodiment, azimuthal spatial DFT filtering is applied to digit al data produced by analog to digital conversion. In another embodiment, cosine transform filtering is applied by an apodised receiver element. |
