Non-integral dimensions ultrasonic phased arrays in a borehole  

作　　者：ZHANG Bixing ZHANG Chengguang Deng Fangqing 

机构地区：[1]State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences Beijing 100190 [2]School of Geophysics & Oil Resources, Yangtze University Jingzhou 434023

出　　处：《Chinese Journal of Acoustics》2009年第3期220-230,共11页声学学报（英文版）

基　　金：supported by the National Nature Science Foundation of China(10774158).

摘　　要：The non-integral dimensions ultrasonic phased arrays and their scanning and testing methods in a borehole are studied. First, the focusing acoustic fields excited by the 1.25D, 1.5D, and 1.75D phased arrays are analyzed, and then the imaging resolution in the elevation direction and the influence of the dynamic elements are investigated. Second, the focusing and deflexion characteristics of the acoustic fields excited by the annular and segmented annular phased arrays are studied, and they are compared with those excited by the 2D surface array. The application method of the 1.25D, 1.5D, and 1.75D, annular and segmented annular phased arrays in acoustic logging are analyzed and discussed. It provides a theoretical foundation for the application of the ultrasonic phased arrays in acoustic logging.The non-integral dimensions ultrasonic phased arrays and their scanning and testing methods in a borehole are studied. First, the focusing acoustic fields excited by the 1.25D, 1.5D, and 1.75D phased arrays are analyzed, and then the imaging resolution in the elevation direction and the influence of the dynamic elements are investigated. Second, the focusing and deflexion characteristics of the acoustic fields excited by the annular and segmented annular phased arrays are studied, and they are compared with those excited by the 2D surface array. The application method of the 1.25D, 1.5D, and 1.75D, annular and segmented annular phased arrays in acoustic logging are analyzed and discussed. It provides a theoretical foundation for the application of the ultrasonic phased arrays in acoustic logging.

分 类 号：TB552[理学—物理] TN821.8[理学—声学]