【摘要】 通过PC机编程生成试验所需的高频调幅信号,分别经RS232串口及IEEE488并口发送给任意函数发生器HP33120A,经函数发生器接收、处理后,输出所需超声波激励信号;着重研究了PC机与任意函数发生器之间基于RS232与IEEE488接口的数据通信以及信号频率与周期的可调整性;成功地实现了汉宁窗、高斯窗调制的任意频率单音频信号的产生,达到了任意波形发生器的功能.更多还原

【Abstract】 The signal with high frequency and amplitude modulation by PC programming is sent to HP33120A Arbitrary Function Generator through RS232 serial port and IEEE488 parallel port. HP33120A Arbitrary Function Generator receives and processes the signal, then outputs the needed signal for exciting ultrasonic guided waves. The data communication between PC and HP33120A generator through RS232 serial port and IEEE488 parallel port is lucubrated and the adjustability of frequency and period of the signal is emphasized. The real arbitrary waveform generator that can generate single acoustic frequency signal modulated by Manning window and Gaussian window is developed.更多还原