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结合单片机可操作性强、PC机处理数据能力强和CPLD产生波形精确等特点,设计了瞬变电磁发射机。在输出精确双极性方波的基础上,创新地实现了输出波形的频率及占空比可调的功能。采用VB语言设计信号发射界面,输入控制指令,完成PC机、单片机和CPLD之间的通信;最终由CPLD产生精确的方波信号,经驱动后,在线圈中形成双极性方波,作发射信号使用。实验证明,该系统功能完善,可靠性高,达到了设计要求。
Combined with the strong operability of single-chip microcomputer, the ability of PC to process data and the precision of waveform generated by CPLD, the transient electromagnetic transmitter was designed. Based on the output of precise bipolar square wave, the function of adjustable output frequency and duty cycle is innovated. Using VB language design signal launch interface, enter the control instructions to complete the PC, SCM and CPLD communication between the final CPLD to produce accurate square wave signal, the drive, the coil in the formation of bipolar square wave for emission Signal use. Experiments show that the system has perfect functions, high reliability and meets the design requirements.