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The directional radiation of acoustic power based on acoustic phased arc array transmitter is a key technology for a multidimensional array acoustic logging tool. The phased arc array transmitter comprises of several array transducers arranged around a circumference. The sharp increment of transducers makes a challenge to exciting circuits. In this paper, three excitation methods based on the transformer (TF), half-bridge (HB) and full-bridge (FB) are studied by experiment. Experimental results show that HB is the most efficient one. And HB also features small size, less components involved, simplicity in exciting voltage and frequency adjustment. 32 transducers and 32-channel excitation circuits based on half-bridge form an active downhole acoustic phased arc array transmitter, which is studied in a water pool. Experimental results are conforming to numerical simulation. This proves the good feasibility of the excitation method.
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