Acoustic transducers configured with transducer elements disposed on an
arch or arcuate shaped member adapted to fit in juxtaposition around a
tubular. The arcuate shaped member is adapted with conductors to provide
a voltage to the transducer elements. One embodiment uses a metallic
arcuate shaped member. Embodiments implemented as sources are used to
excite borehole acoustic modes. Some embodiments provide phased array
acoustic energy excitation/signal reception. The transducers are covered
with a sealer in a liquid-free configuration and shields are used to
protect the transducers.