多元相控聚焦探测器的方向特性

Directivity of multi-element phase-controlled focus transducer

研究了多元线性阵列探测器的主频、阵元个数和阵元间距对探测器方向性的影响.实验结果表明,采用主频为2～5 MHz,阵元数为5～15,阵元间距为0.3～0.9 mm的多元线性阵列探测器,其方向性好,将有利于光声信号的探测与成像.

Effects of the basic frequency,the number of multi-element transducers,and the space between transducers on the directivity of multi-element linear transducer array were studied.The results showed that the directivity of multi-element linear transducer array was optimal when the dominant frequency was 2～5 MHz,the number of multi-element transducers was 5～15,and the space between transducers was 0.3～0.9 mm.These conditions were favored for well detecting and imaging of photoacoustic signals.