针对固体火箭发动机在超声阵列测试过程中对测试系统体积小、抗干扰能力强、独立存储测试的需求,设计了一种小型化多通道超声存储测试系统。首先,设计了超声发射电路和ADC采集电路,以ZYNQ 7020为主控芯片,对二者进行驱动,并利用PL资源完成LVDS高速ADC接口、AXI A/D IP核和DMA高速传输模块设计,实现双极性超声激励、10 MHz多通道同步并行采集;其次,利用PS资源开发了eMMC存储模块和外部控制功能;最后,对系统进行实验验证。测试结果表明,设计的多通道超声存储测试系统工作稳定,能够有效获取超声回波信号。

In order to meet the requirements of small size,strong anti-interference ability and independent storage test for solid rocket engine in array ultrasonic test,a miniaturized multi-channel ultrasonic storage test system is designed in the paper.Firstly,the ultrasonic transmitting circuit and ADC acquisition circuit are designed.ZYNQ 7020 is used as the main control chip to drive the two circuits.The LVDS high-speed ADC interface,AXI A/D IP core and DMA high-speed transmission module are designed using PL resources to achieve bipolar ultrasonic excitation and 10 MHz multi-channel synchronous acquisition.Secondly,eMMC storage module and external control function are developed by using PS resources.Finally,the experiment results show that the designed multi-channel ultrasonic storage test system works stably and can obtain ultrasonic echo signal effectively.