Key;
Laboratory;
of;
Nondestructive;
Test;
of;
Ministry;
of;
Education,;
Nanchang;
Hangkong;
Univ.;
330063;
Engineering;
Institute;
of;
Corps;
of;
Engineers,;
PLA;
University;
of;
Sci.;
and;
Tech.;
Nanjing;
210007;
College;
of;
Aerospace;
Engineering,;
Nanjing;
University;
of;
Aeronautics;
and;
Astronautics;
Nanjing;
210016;
混凝土结构; 成像技术; 超声无损检测; 成像分辨率; 截面; 二维; 信号处理; 超声换能器;