摘要
超声相控阵发射波束形成中的关键环节是对各阵元的发射相位延时进行精确控制,以得到灵活可控、指向性良好、焦点尺寸细小的聚焦声束,从而获得被检物体的清晰成像。本文研制了基于复杂可编逻辑程器件(CPLD)和可编程数字延迟线(AD9501)的超声相控阵系统中的高精度相控发射系统。该系统可同时控制16通道,它的延时分辨率可达1ns,最大延时值达到655μs。
High-precision ultrasonic transmission phase delay is the key technology in phased array ultrasonic beams, in order to achieve flexible, controllable focusing ultrasound beam which has nice tropism and small focal spot size. Then clear imaging of specimen can be obtained by such way. On the basis of Complex programmable logic device （CPLD） and digital programmable delay line, high-precision phased ultrasonic transmission in phased array ultrasonic systems is designed in this paper. The system can control 16-channel simultaneously, its delay resolution can reach lns and its max delay time can be 655μs.
出处
《中国测试技术》
2007年第2期10-12,共3页
CHINA MEASUREMENT & TESTING TECHNOLOGY
基金
国防重点实验基金项目(9140C12040101607)
关键词
无损探伤
超声
相控阵
相位延时
CPLD
Non-destructure testing
Ultrasonic
Phased array
Phase delay
Complex programmable logic device（CPLD）
