| 摘要 |
Acoustic wave transmitter-receiver comprising at least one pair of transducer assemblies arranged symmetrically with respect to a vertical axis, the transducers of each assembly being lined up with a regular spacing such that the projection length thereof on the vertical axis is equal to a whole number of wave lengths of the transmitted acoustic waves, means for generating transmission signals and means for transmitting the latter, in phase opposition, to the two transducer assemblies of said pair.
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