Superimposable 32 Independent Channel Ultrasonic Pulse Excitation Module Design And Multi-channel System Integration

Ultrasound technology is widely used in medical diagnosis and non-destructive testing,and has very important applications in industries such as industry,medicine,aerospace and military.Producing sound fields with specific needs is a key part of ultrasound applications,and stimulating ultrasound signals according to specific patterns is the core technology of the entire application.The more mature method for generating a specific sound field is to use the ultrasonic phased array technology to control the sound field.The multi-channel ultrasonic excitation source is the basis of the phased array.In order to meet the needs of ultrasound excitation for multi-channel independent parameters in ultrasound research,this paper developed 32 independent channel ultrasonic pulse excitation module,and based on this module,integrated into multi-channel ultrasonic pulse excitation system for ultrasound research.The field offers an integrated,ultrasonic phased array module with a wide range of adjustment parameters.According to the design index,based on the analysis of the working principle of ultrasonic pulse generation,the 32 independent channel ultrasonic pulse excitation module can be designed and implemented independently.The module system integration is realized,and 64 channels and more under computer control are realized.The parameters such as excitation phase delay,voltage amplitude,center frequency,pulse duty cycle and pulse repetition frequency of each channel of the channel are independently adjustable,and ultrasonic pulse excitation of dynamic phase delay control can be performed according to the reference phase among multiple channels.system.The main work of the thesis is as follows:(1)Determine the module development and system integration scheme.Firstly,according to the excitation characteristics of the transducer,the performance index and output waveform of the ultrasonic pulse generator are established,and the 32-channel ultrasonic pulse excitation module implementation scheme and the integrated multi-channel ultrasonic pulse excitation are developed.System implementation.(2)The hardware structure of the 32-channel ultrasonic pulse excitation module working independently is designed.It consists of 4 units:the excitation unit for driving the ultrasonic transducer ultrasonic;the control unit for transmitting the PWM signal and the module logic;A power supply unit that provides a transducer excitation power supply;a system communication unit required for system integration for integrated control.(3)Multi-channel ultrasonic pulse excitation system integration based on TCP/IP network communication through a computer.Including the design of the communication client and the design of the server,the control of each module by the integrated system,the system integration of the multi-channel module expansion,and the design of the multi-channel ultrasonic pulse excitation system in which multiple modules work together according to the same reference phase delay.After the system parameter test evaluation,including pulse width accuracy,rising and falling edge time,phase delay accuracy,system stability analysis,sound power test,the results show that the 32-channel ultrasonic pulse excitation module can work independently;under computer control,it can Multiple 32-channel modular systems are system integrated,each channel can be dynamically controlled according to the reference phase delay,and the developed equipment meets the design requirements.It provides a 32-channel ultrasonic pulse excitation module that can work independently for the field of ultrasound research,and can be integrated into a computer-controlled multi-channel ultrasonic pulse excitation system.