在LabVIEW下基于调用DLL的压缩机气缸压力信号的采集

Acquisition of compressor cylinder pressure signal based on DLL under Lab VIEW

为实现活塞往复压缩机气缸内压力信号的采集,研究了Lab VIEW调用外部代码的方法,即库函数节点CLF调用外部的动态链接库和代码接口节点CIN调用C源代码,介绍了在虚拟仪器软件开发平台Lab VIEW上调用动态链接库的技巧及过程,实现了具有DMA直接内存访问功能的数据采集模块USB20D的通信。实践证明,基于动态链接库的Lab VIEW数据采集系统简单易行,运行效率高,使Lab VIEW强大的图形化编程和数据处理功能与非NI公司的数据采集设备结合而进行数据采集。

In order to implement the piston reciprocating compressor pressure in the cylinder of the high-speed data acquisition,this paper studied the Lab VIEW call external code method,library function node CLF call external dynamic link library and code interface node CIN call C source code,introduced Lab VIEW called dynamic link library technique and process,realized the function of a direct memory access（ DMA） data acquisition module USB20 D. It has been proved that the method is simple,high efficiency,Lab VIEW powerful graphical programming and data processing function with the non NI data acquisition devices combined with data collection.