【摘要】 针对超声相控阵检测系统工作环境较为恶劣、延时发射电路复杂、多路信号的采集难以单板实现以及多路信号处理实时性差等问题,提出了一种基于CPCI总线和FPGA的超声相控阵控制、采集与全并行处理系统的设计。本设计采用CPCI总线架构,可以在高尘、高冲击负荷等恶劣环境下工作,采用带高速串行LVDS接口的ADS445与XC5VSX95T相组合的方式来实现单板16路信号的高速信号采集和全并行处理,采用XC5VSX95T中的高速计数器来实现2ns的高精度延时发射,还提供了功能强大的主控软件便于用户操作。分析结果表明,多路AD+FPGA的硬件结构特别适合相控阵系统。实测结果表明,本系统可以较好地对钢管的缺陷进行实时检测和A扫与B扫成像。更多还原

【Abstract】 A design of control &signal acquisition and fully parallel processing Phased Array Ultrasonic System based on CPCI bus and FPGA is developed,while working environment of the system is harsh,the circuit of delay-transmission is complicated,multi-channel echo signals is hard to be acquired in single PCB and then to be processed in real time.In this design,the CPCI bus architecture is used to ensure the system works in harsh environment such as high temperature and high pressure,etc,the combination of ADS6445 with high-speed serial LVDS interface and XC5VSX95T achieves high-speed data acquisition and fully parallel processing of 16 channels of echo signal in one PCB,the high-speed counters in XC5 VSX95T accomplishs transmission with high precision delay of 2ns,the powerful master software is provided to be operated conveniently by users.The analysis result shows that the combination of multi-channel AD&FPGA is greatly suitable for phased array ultrasonic system.Test results show that the system accomplishs real-time inspection and vivid image of A-scan and B-scan for defect in a steel tube.更多还原