【作者】 吕红英；

【导师】 吴先球；

【作者基本信息】 华南师范大学 ， 物理课程与教学论， 2005， 硕士

【摘要】 虚拟仪器代表着未来仪器的一个重要发展方向,体现了“软件就是仪器”的特点。基于虚拟仪器的远程实验,将虚拟仪器技术与远程实验技术结合,为学生提供了一种全新的实验环境。 本文开发了成本低廉的基于计算机声卡的虚拟信号发生器和虚拟双踪示波器,研制了基于虚拟仪器技术的电磁学远程实验教学系统。用LabVIEW软件编写了客户机与实验机程序,实现了虚拟信号发生器经声卡输出信号、串行口与单片机系统的通信、单片机调节电路元件参数、虚拟示波器和虚拟电压表实时采集待测电路波形和电压数据、TCP/IP网络通讯等功能;用Linux中的IPtables防火墙技术实现实验机与服务器间的端口映射;用Dreamweaver和Flash设计了电磁学远程实验教学系统主页,包括“示波器的使用”、“RLC串联电路的暂态过程”、“RLC串联电路的相频特性和幅频特性”和“RLC并联电路的相频特性和幅频特性”4个电磁学远程实验。 学生访问电磁学远程实验教学系统网站,预习实验的相关内容后进行远程实验。通过操作仿真的实验仪器面板,调节虚拟信号发生器的输出,改变远程实验室的电阻、电容等元件值,获得真实实验电路的波形和电压数据,用虚拟示波器和虚拟电压表进行测量分析,在异地完成真实的电磁学实验。 基于虚拟仪器的远程实验的测量结果,与学生在传统实验室进行实验的测量结果一致。基于虚拟仪器技术的电磁学远程实验教学系统减少了实验所需的硬件设备,实现了实验资源的共享,适用于大学物理实验室作为教学实验使用。更多还原

【Abstract】 The virtual instrument represents an important development direction of the future instrument, and embodies the characteristic of "software is instrument". The remote experiment based on the virtual instrument, which combines virtual instrument technique with remote experiment technique, provides the students with an entirely new experiment environment.In this paper, the low-cost virtual signal generator and the virtual double-traced oscilloscope based on a PC sound card were designed, and the teaching system of the remote electromagnetism experiments based on virtual instrument technique was developed. The programs for the client computer and the experiment computer were written in virtual instrument software LabVIEW and various functions had been realized, including signal output of the virtual signal generator via the sound card, communication with the singlechip through the serial port, adjustment of the parameters of circuit elements by the singlechip, real-time acquisition of the waveform and the voltage by the virtual oscilloscope and the virtual voltage meter, Internet communication by using TCP/IP technology and so on. The port mapping between the experiment computer and the server computer was realized with IPtables Netfilter technology in Linux system, and the homepage of the teaching system of the remote electromagnetism experiments was designed with Dreamweaver and Flash, including four remote experiments, namely, "the usage of the oscilloscope ", "the transient process of RLC serial connection circuit", "the frequency characteristic of RLC serial connection circuit" and "the frequency characteristic of RLC parallel connection circuit".When students visit the website of the teaching system of the remote electromagnetism experiments, they can firstly prepare correlative contents, then conduct remote experiment by operating the emulational instrumental panel. They can adjust virtual signal generator, change parameters of circuit elements such as the resistance and the capacitance which are in the remote laboratory, acquire actual waveform and voltage, measure and analyze them with virtual oscilloscope and virtual voltage meter. So students remotely accomplish the remote electromagnetism experiments with the feelings of running actual experiments.The result of remote experiment based on virtual instrument is consistent with the result of laboratory experiment. The teaching system of the remote electromagnetism experiments based on virtual instrument technique reduces hardware requirements, and achieves a share of the experiment resource, so it is desirable that remote experiment should come into use in the experiment teaching of the college physics laboratory.更多还原