摘要
为了实现水下超声成像系统中超声信号的相控阵发射,提出并设计了一种基于FPGA的超声相控阵发射系统。分析了相控聚焦的发射原理,利用FPGA丰富的I/O引脚和内部逻辑资源实现了八通道超声相控阵激励信号的发射,并设计了信号调理电路对激励信号进行D/A转换及放大,以有效驱动压电换能器。通过实验测试表明,该系统可以实现超声信号的相控聚焦发射,相控延时精度达到2.5 ns,发射信号稳定,系统集成度高,可以应用于水下超声成像的实现。
In order to enhance the ultrasonic signal phased array transmission of underwater ultrasonic imaging system,the ultrasonic phased array transmission system based on FPGA was designed. The transmission principle of phased focus was analyzed,and the eight channel ultrasonic phased array transmission system was achieved by using FPGA with rich I / O pins and internal logic resources. Then the signal conditioning circuit for excitation signal D / A conversion and amplification were designed to motivate the piezoelectric transducer effectively. The actual test results show that the system realizes ultrasonic signal phased array focus transmission,and the phase delay precision is 2. 5 ns. The system is with high integration and stable transmission,and it can be applied to the underwater ultrasonic imaging implementation.
出处
《仪表技术与传感器》
CSCD
北大核心
2015年第7期54-56,共3页
Instrument Technique and Sensor
基金
国家自然科学基金项目(61127008)
关键词
水下超声成像
相控阵
相控聚焦
FPGA
信号调理电路
压电换能器
underwater ultrasonic imaging
phased array
phased focus
FPGA
signal conditioning circuit
piezoelectric transducer
