基于Labview的高速数据采集与存储系统的设计

The Design of High Speed Acquisition and Storage System Based on Labview

摘要: 针对市面上现有的一般的数据采集卡采样位数不高和采样内存不够，从而不能进行长时间对信号进行有效的连续采样等问题。本文设计了基于labview的高速数据采集和存储系统。该系统能够实现高精度、高数据率，还可以采用软件和硬件同步触发的方式来完成对周期信号进行多通道连续实时监测采集和存储，使数据采集存储系统的采样内存扩展至电脑的内存。本系统以NI公司的高速数据采集卡为基础，以labview 2012为上位机软件开发平台，由数据采集卡对周期信号进行数据采集再通过串口将采集到的数据上传到上位机，上位机对采集的数据进行存储、显示和分析实现了多通道模拟量的实时监测。该设计最终实现了采样通道数为2，采样速率为200 M/s，采样精度为12位，采样深度达到2000。平台有效性验证了该采集平台兼容性好、性能稳定采集信号误差小，能够尽量做到对实际信号源数据的无失真还原。本文为高速数据采集提供了一种便携的设计方案，可以广泛的应用到现代测试测量技术工程中。

Abstract: In view of the existing general data acquisition card in the market, it is not enough to have high sampling and sampling memory, so that the acquisition system cannot be carried out for a long time. The design of high speed data acquisition and storage system is based on Labview. It can not only achieve high accuracy and high data rate but also use the software and hardware synchronization trigger to complete the multi-channel continuous real-time monitoring of the acquisition and storage of periodic signal which is similar to the function of the oscilloscope. This system is based on high speed data acquisition card of NI company and Labview 2012 for PC software development platform. Data acquisition card is used for data acquisition of periodic signal through the serial port and collect data upload to upper computer. Upper computer collects data for storage, display and analysis to realize the real-time monitoring of mul-ti-channel analog. The design of the sampling channel is 2, the sampling rate up to 200 M/s, the sampling precision is 12, and the sampling depth is 2000. Platform validation of the collection platform has good compatibility, performance and stability of the collection signal error is ignorable, which can be as far as possible to the actual signal source data without distortion reduction. This paper provides a portable design for high speed data acquisition, which can be widely used in the engineering of modern test and measurement technology.