Design Of 128-channel Ultrasonic Phased Array Digital Control Module Based On FPGA

Ultrasonic phased array flaw detection technology is an important branch of nondestructive testing technology and is widely used in industrial flaw detection and medical ultrasound inspection.The circuit of 128-channel high-integration ultrasonic phased array hardware system and digital control module based on FPGA are disigned.The digital control module is simulated and tested.The specific work content and main results are as follows:The basic principles of ultrasonic flaw detection technology are studied.The calculation formula of array element delay time in ultrasonic phased array under the condition of beam deflection and focusing is deduced.The influence of ultrasonic phased array aperture size on flaw detection effect is studied.Two basic scanning methods in the ultrasonic phased array are introduced.The design of the hardware circuit of the highly integrated 128-channel ultrasonic phased array system is completed by a fully integrated solution.PCB design optimization is made for possible SI/PI problems such as reflection,crosstalk,power rail collapse,etc.Impedance control requirements are proposed.The PCB laminate structure is customized,and the whole PCB board design is completed based on HyperLynx simulation software.Complete the design of the entire FPGA digital control module,including FPGA overall functional module division,cross-clock domain signal processing,1.25 ns high-precision transmission delay algorithm design,AFE5832 module control,ultrasound beam synthesis algorithm design,data transmission and cache module design,etc.The control of the AFE5832 module is designed with the SPI configuration flow,LVDS clock phase delay calibration algorithm and data receiving module.Complete simulation and testing of each module of the FPGA digital control module,including simulation of transmission delay accuracy,AFE5832 receiving module SPI configuration and data receiving simulation,ultrasound beam synthesis module simulation,etc.Finally,the testing software is written and complete the testing of data transfer and caching modules on an old board.The simulation and test results show that the FPGA digital control module is logically correct,and the data transmission and cache module work is stable and reliable.