基于虚拟仪器技术的数字滤波及频率测试

论文编号:JD879  附开题报告,任务书,源代码,外文翻译,论文字数:18087,页数:40

摘  要：虚拟仪器是由一些必要的硬件获取调理信号，并以通用计算机为平台，实现不同测量软件对采集获得信号进行分析处理及显示。他打破了传统仪器的功能只能由厂家定义，用户无法改变的模式。
本系统主要使用labview与USB—6008数据采集卡，对所采集到的输入信号进行测试和分析，不但可实现数字滤波分析而且可对频率进行测试。用户可以根据自己的实际需要选择所需功能并设计仪器面板上的各种按钮。频率测量分时域和频域两大功能，可分别对信号的时域的瞬态指标和频域的频谱分析进行测试和显示。频域的主要特性有谐振峰值、频率、幅值等进行数值测量。时域的主要特性有直流、正峰、均方根等进行数值测量。数字滤波器可对各种滤波后的信号进行频率、幅值等数值测量。

关键字：Labview；虚拟仪器；时域；频域；数字滤波器；数据采集

The digital filter and frequency measurement based on the virtual instrument technology
Abstract：The virtual instrument which conditioning signals is gained by some essential hardware. It takes the general-purpose computer as a platform and the signal is realized through the different measurement software, such as signal’s analyze, process and display etc. It breaks traditional rule that the functions of instrument can only be defined by the factory, and the mode cann’t be changed by customers.
In this paper the conditioning signals is obtained by USB-6008 data acquisition card. With the development platform of LabVIEW software the inputting signals are mainly tested, analyzed and collected in the system. Not only digital the analysis of filtering can be achieved, but also the test of frequency is obtained. According to practical demand users can select the desired functions and design various buttons on the instrument. Domain function and frequency function domain are introduced, tested and displayed in the frequency measurement. In frequency domain the main parameters of the resonance peak, frequency, amplitude are tested. Main characteristics of time-domain, such as direct-current, positive peak value, root-mean-square are gotten. Filtered signal can be gained in the frequency, amplitude in digital filters.

Keywords：Labview；Virtual instruments；time-domain； frequency domain；digital filters；Data Acquisition

摘要 
目录 
1.绪论  1
1.1引言  1
1.2课题的主要内容  2
2虚拟仪器概述  3
2.1虚拟仪器的产生历程  3
2.2虚拟仪器的基本概念  3
2.3虚拟仪器的组成  4
2.3.1虚拟仪器硬件平台  4
2.3.2虚拟仪器软件平台  5
2.4虚拟仪器的优点  6
2.5虚拟仪器与传统仪器的比较  6
2.6图形化的编程环境  7
3数字滤波器  8
3.1数字滤波器的基本概念  8
3.2滤波器的种类  8
3.3 FIR理论  10
3.4 FIR滤波器的结构  10
3.5数字滤波器的幅频特性  11
3.6各种数字滤波器的单位冲激响应  12
4频率测试  14
4.1时域测试  14
4.1.1系统的时域分析  14
4.1.2典型输入信号  14
4.1.3时间响应  15
4.2频域测试  15
4.2.1系统的频域分析 15
4.2.2频率特性概述  15
4.2.3频率特性性能指标  18
5系统设计  19
5.1系统概述  19
5.2数据采集和处理模块  20
5.2.1USB-6008数据采集卡  20
5.3数字滤波模块  21
5.3.1滤波器的设计  21
5.3.2数字滤波的面板  27
5.4频率测试模块  28
5.4.1时域模块  29
5.4.2频域模块  30
5.5系统总流程  32
6结论  36
参考文献  38
致谢  39