LAI Puxiang  ZHANG Bixing  WANG Chenghao

(Institute of Acoustics, The Chinese Academy of Sciences Beijing 100080)

Received Jul. 7, 2006

Revised Aug. 14, 2006

Abstract  The characteristics of the radiation and reflection acoustical fields of an annular phased array are investigated. The effects of the element number, element radius, interelement spacing, centre frequency, focus position, and other parameters on the radiation acoustical field of the annular phased array is theoretically studied. In experiment, an annular transducer with 8 equal-area elements is designed and fabricated, and a series of experimental measurements are conducted. The radiation acoustical field and its reflection on a liquid-solid interface are theoretically and experimentally studied. The experimental result is in good agreement with the theoretical one.

PACS number: 43.20, 43.60, 43.35