激励信号源软件控制发生方法研究

摘要

Aiming at the problem of the demand of a variety of excitation signal sources in the process control and automation process, and the problem that the type of excitation signal sources is single,and the sources have narrow application range, and are inconvenient adjust-ment which were generated by conventional method,the method of generating the excitation signal source was studied. Using LabVIEW as the virtual instrument software development platform,the basic waveform,the formula waveform and the special pulse waveform generation pro-gram were designed. Combined with PXI bus technology,the data acquisition cards and oscilloscopes were used to complete a variety of sig-nal source generation and testing. The results show that the excitation signal source generated by this method is more and more stable, the parameter is easy to adjust,the precision is higher and the function is more. The resulting signal source is stable and reliable, suitable for engineering practice.%针对过程控制及自动化过程中对多种激励信号源的需求,以及利用常规方法产生激励信号源种类单一、应用范围窄、信号源参数调节不便等问题,对激励信号源发生方法进行了研究.以LabVIEW为虚拟仪器软件开发平台,设计了基本波形、公式波形及特殊脉冲波形产生程序;结合PXI总线技术,利用数据采集卡和示波器完成了多种信号源的产生及测试.研究结果表明:利用该方法产生的激励信号源种类更多,具有稳定性强、参数调节方便、精度高、功能更多等特点,适用于工程实践中.