| 摘要 |
An acoustic tranducer for use in an acoustic well logging apparatus in a sonde, the transducer (30) comprising a pyramidal frustrum base formed of metal and having external faces thereon and adapted to receive and support piezoelectric crystals on said faces for operating as a transducer in an acoustic well logging apparatus, and having mechanical resonant frequencies in excess of a passband frequency required of such a transducer. |
