a three - dimensional array of acoustic sensors . the array can be used for both the transmission and reception of acoustic signals . the array comprises electroplated piezoelectric polymer layers that are laminated with a non - conductive epoxy to form individual multi - layer array transducer elements . circuit support layer layers are incorporated between the multi - layer array transducer elements . because of the three - dimensional configuration of the array , logical transducers can be created from multiple transducer elements , and transmission and reception of acoustic signals in any direction can be realized .