数字测量系统设计与实现.doc

摘要 随着数字电子技术的发展，由数字逻辑电路组成的控制系统逐渐成为现代检测技术中的主流，数字测量系统也在工业中越来越受到人们的重视。 在实际工作中，常常需要测量两列频率相同的信号之间的相位差，来解决实践中出现的种种问题。例如，电力系统中电网合闸时，要求两电网的电信号之间的相位相同，这时需要精确测量两列工频信号之间的相位差。如果两列信号之间的相位差达不到相同，会出现很大的电网冲激电流，对供电系统产生巨大的破坏力，所以必须精确地测量出两列信号之间的相位差。相位差测量在现代化建设中一直扮演着重要的角色，而且越来越重要。现在，如何提高相位测量的准确度、精度成为新的课题，和追逐的焦点。伴随着数字时代的到来，也给测量技术带来了新的机遇，各种传统的测量方法逐渐被数字仪器取代，对于相位差测量，数字化也是必然趋势。数字式仪器采用数码管显示相位差，精确度高，稳定性能好，读数方便且不需要经常调试，所以数字式测量仪逐渐替代了原来的模拟式仪器。 关键词 单片机； 相位差； LED Abstract With the development of the digital electronic technology, the control system composed of digital logical circuits gradually becomes the mainstream in the modern detection technology,the digital measuring system is also paid to more and more attention by people in industries. In the practical work, we often need to survey the phase difference which is between the two signals of the same frequency, for solving all sorts of problems which appear in the practice. For example, in the electrical power system when the electrical network switch , requiring two electrical networks electrical signals phase to be the same, now we need for the accurate measurement of the phase differences between the two frequency signals . If two row signals phase differences cannot keep the same, which will led to a big impulse current in the electrical network, whats more led to a huge destructive power to the power supply system therefore the phase differences must be accurately measured between the two signals . The phase difference measurement is continuously acting the important role in the modernization, even becomes more and more important. Now, how to enhance the accuracy and the precision of the phase difference measurement becomes the new task and the focus which is pursued. With the digital Ages arrival, it brings the measuring technology a new opportunity, all traditional measuring technique are gradually replaced by the digital instruments, regarding the phase difference measurement, the digitization is also the inevitable trend. The digit