基于LabWindows/CVI的信号分析仪的研究
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摘要
信号分析仪器是进行科学研究和工业生产过程参数检测的重要工具,传统信号分析仪器的结构和功能主要是由硬件电路来实现,功能不易扩展。虚拟仪器把计算机技术和仪器技术结合起来,充分利用计算机技术来实现或增强传统仪器的功能,具有结构简单、开发周期短、系统容易扩展等优点,同时便于和计算机网络相连接,容易实现信息的管理和共享。
本文叙述了信号采集及处理的关键技术,包括信号采集子模块的硬件组成、虚拟仪器的软件结构以及采集卡驱动程序的调用方法等,对信号处理的基础知识进行了简要介绍,分析了虚拟仪器软件开发平台的特点。在此基础上选用LabWindows/CVI虚拟仪器软件开发平台,开发了一台采用USB总线的虚拟信号分析仪,实现了信号的实时采集、时域和频域分析等功能。本文提出的虚拟信号分析仪的实现方案采用了Windows的多线程技术,把信号采集、信号分析和人机交互界面分配到独立的线程中并行运行,缩短了系统响应用户操作的时间,提高了系统的运行效率。在数据管理工作方面,设计了广州计量院电磁室仪器检定数据库的E-R模型,选用Access数据库管理系统实现了广州计量院电磁室仪器检定数据库,并可通过调用ADO数据模型访问该数据库,简化了计量数据的管理工作。
论文最后对基于LabWindows/CVI的虚拟信号分析仪的时域波形显示子模块进行了测试分析,简要分析了误差的来源,并对虚拟仪器的计量检定中需要注意的问题进行了介绍。
Signal analysis instrument is an important tool for scientific research and testing parameters in industrial processes, the structure of traditional signal analysis instrument and function accomplished mainly by the hardware circuit, no function expansions. Computer and equipment technology will be a perfect combination in virtual instruments, make full use of computer technology to achieve or enhance the functions of traditional instruments, advantages of virtual instruments are:simple in structure, short development cycle, the system easy to extend ,and connect to the computer network is simple and easy to achieve information sharing.
This paper describes the key technologies of signal acquisition and processing,including hardware components of signal acquisition subsystems,the software structure of virtual instrument system, methods of acquisition card drivers call. And the basic knowledges of signal processing,the features of the virtual instrument software development platform in a brief analysis. Based on these foundations,the paper developed a USB bus data transmission signal analysis instrument on LabWindows/CVI virtual instrument software development platform, to achieve a real-time signal acquisition, time domain analysis and frequency domain analysis.The scheme of virtual signal analysis instrument use the Windows multi-threading technology,allocate the signal acquisition, signal analysis and human-computer interface to independent threads,shortened the time of respond to user operation and increase the system's efficiency.Design the database of the electromagnetic department of Guangzhou Institute of Measuring and Testing Technology equipment verification E-R model,realised the database based on the Access database management system, and visit the database by calling ADO data model , which simplifies the verification data management.
Finally, time-domain waveform display submodule of virtual signal analysis instrument based on the LabWindows/CVI was tested, and describes a brief analysis of the error sources,and the attentions need to pay in the virtual instrument verification work introduced.
本文叙述了信号采集及处理的关键技术,包括信号采集子模块的硬件组成、虚拟仪器的软件结构以及采集卡驱动程序的调用方法等,对信号处理的基础知识进行了简要介绍,分析了虚拟仪器软件开发平台的特点。在此基础上选用LabWindows/CVI虚拟仪器软件开发平台,开发了一台采用USB总线的虚拟信号分析仪,实现了信号的实时采集、时域和频域分析等功能。本文提出的虚拟信号分析仪的实现方案采用了Windows的多线程技术,把信号采集、信号分析和人机交互界面分配到独立的线程中并行运行,缩短了系统响应用户操作的时间,提高了系统的运行效率。在数据管理工作方面,设计了广州计量院电磁室仪器检定数据库的E-R模型,选用Access数据库管理系统实现了广州计量院电磁室仪器检定数据库,并可通过调用ADO数据模型访问该数据库,简化了计量数据的管理工作。
论文最后对基于LabWindows/CVI的虚拟信号分析仪的时域波形显示子模块进行了测试分析,简要分析了误差的来源,并对虚拟仪器的计量检定中需要注意的问题进行了介绍。
Signal analysis instrument is an important tool for scientific research and testing parameters in industrial processes, the structure of traditional signal analysis instrument and function accomplished mainly by the hardware circuit, no function expansions. Computer and equipment technology will be a perfect combination in virtual instruments, make full use of computer technology to achieve or enhance the functions of traditional instruments, advantages of virtual instruments are:simple in structure, short development cycle, the system easy to extend ,and connect to the computer network is simple and easy to achieve information sharing.
This paper describes the key technologies of signal acquisition and processing,including hardware components of signal acquisition subsystems,the software structure of virtual instrument system, methods of acquisition card drivers call. And the basic knowledges of signal processing,the features of the virtual instrument software development platform in a brief analysis. Based on these foundations,the paper developed a USB bus data transmission signal analysis instrument on LabWindows/CVI virtual instrument software development platform, to achieve a real-time signal acquisition, time domain analysis and frequency domain analysis.The scheme of virtual signal analysis instrument use the Windows multi-threading technology,allocate the signal acquisition, signal analysis and human-computer interface to independent threads,shortened the time of respond to user operation and increase the system's efficiency.Design the database of the electromagnetic department of Guangzhou Institute of Measuring and Testing Technology equipment verification E-R model,realised the database based on the Access database management system, and visit the database by calling ADO data model , which simplifies the verification data management.
Finally, time-domain waveform display submodule of virtual signal analysis instrument based on the LabWindows/CVI was tested, and describes a brief analysis of the error sources,and the attentions need to pay in the virtual instrument verification work introduced.
引文
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