Research On Virtual Testing System For Logging Instruments

Virtual Instrument is an integrated production of computer technology, signal processing technology and instrument technology. As the developmental trend of testing instruments in 21st century, it is being applied to much field, but domestic applications to oil testing instruments are few. With the introduce of the concept of virtual instrument into design of oil testing instruments, a virtual testing system for logging instruments is presented in this paper. It realizes analysis and display function with the substitution of computer software for traditional hardware, decreases the size and improves the precision of testing instruments, which is much significant to the update oil instruments.On the base of analyzing virtual instrument technology and modern computer bus technology, the thought of combining USB technology and virtual instrument technology is put forward, the whole configuration of the virtual testing system is presented and the minimal design of it is implemented from both hardware and software.On the hardware design, advanced catch technology and programmable logic technology are used to design the USB acquisition card based on PDIUSBD12, front-back programming structure is used to design firmware for the SCM on the acquisition card, and Windows DDK and DriverStudio are used to compile the USB driver programs. The kernel part of the virtual instrument is to implement testing function using software. Based on LabVIEW and layered design method, four modules of multi-parameter telemetry combination logging tools, analog tri-combination logging tools, multi-function signal generator and frequency analyzer are realized with the application of such digital signal processing methods as correlation analysis, FIR filter and etc.The system has a friendly interface and easy to operate. The experiment result shows that it can efficiently complete the basic testing task and is of practicable value. ...