基于PCI-1002的高速数据采集

High-Speed Data Acquisition Based on PCI-1002

温度脉动仪是测量大气光学湍流强度折射率结构常数的重要仪器,由于温度脉动仪测量的是大气温度的快速起伏变化,在进行温度脉动仪标定时,对温度脉动信号进行准确高效的采集是确保标定实验成功的前提。针对双通道风洞式温度脉动仪标定系统编写了基于PCI-1002高速采集卡的多通道数据采集软件,应用成熟的GUI框架MFC,结合Windows系统下的高精度定时器,对不同通道下的温度脉动信号进行了实时采集,并实现了数据的实时显示、存储和初步计算。实验结果表明该数据采集系统可以方便地完成信号采集、处理、存储和显示,从而为后续的标定实验提供可靠的数据支持。

Micro-thermometer is an important tool to measure the refractive index structure constant. The rapid change of atmospheric temperature is the measuring object, so accurate and effective signal collection of temperature fluctuation is the precondition of demarcating micro-thermometer successfully. In view of twochannel wind tunnel micro-thermometer calibrating system, the multiple-channel data acquisition program is programed based on PCI-1002 acquisition card. With the combination of high-precision timer of Windows operation system and MFC programming frame, the accurate and efficient multiple-channel acquisition to temperature fluctuation signal is performed, and the data sets are displayed, stored and computed in computer systems at the same time. The results show that by using high-precision timer of Windows system, the data gathering program works properly and can provide a reliable support for micro-thermometer experiment.