A Virtual Instruments Based Water Tunnel Data Acquisition System

With the R&D of the Water Tunnel Data Acquisition System which is based on the Virtual Instruments technology, the paper presents the method to develop VI systems.The paper researches the software structure and system architecture of VI, also proposes a new software structure in which the exchange of data can be done via database. The software structure lowers the degree of conjunction among software models, making the testing system easy to adapt to further demands.Based on the research of digital filtering, the paper presents a new digital filtering method and analyzes its feasibility. The paper also introduces the method of subroutine programming to Lab VIEW with Dynamic Link Library (DLL) supporting its significant property. By extending Digital Filter subroutines, it supplies a gap to Lab VIEW.Covering networking test function to this acquisition system, the paper presents the method of networking test based on WEB and introduces its relative technology.The result of the experiment indicates that the system's functions and capabilities catch the requirement of the devise and applications. Comparing with the traditional method, the new system strikingly reduces manual work and increases the test and processing efficiency.