Research Of Ultrasonic-testing Virtual Instrument Based On LabVIEW

In order to improve the efficiency and reliability of the ultrasonic-testing, the article which is based on PC ultrasonic-testing virtual instrument, synthesized to apply ultrasonic-testing technology, virtual instrument technology, computer technology, electron and digital signal processing technologies in order to further integrity function of ultrasonic-testing virtual instrument. The ultrasonic-testing virtual instrument can not only finish real time, analysis, processing of ultrasonic signal, but also finish A and C scan of ultrasonic defect detector through controlling scan system by software, data processing and various functions of defects analysis of locating, quantum, quality, and realize the picturization, intelligentization and automatization of ultrasonic-testing.The ultrasonic-testing virtual instrument is made up of the data acquisition card and ultrasonic-testing virtual instrument software, which has the merits of simple structure, powerful function and high ratio of performance to cost. The card has a 40MHz sampling rate, 8 bit precision and 64KB high-speed SRAM, and can meet the requirement of common industrial ultrasonic-testing. The ultrasonic-testing virtual instrument software is consisted of the driver of the data acquisition card and the ultrasonic-testing virtual instrument application software, which has functions of acquainting data, signal spectrum analysis, power Spectrum analysis, wavelet analysis, defects identify, and operating the instrument front panel is as similar as operating real instrument, intelligentization is realized really. The driver makes use of the CLF node of LabVIEW to finish data communication between data acquisition card and LabVIEW, through calling DLL and debugging the program under VC++. The appliance software integrates many algorithms of digital signal processing and image processing to process the scanning date by the LabVIEW platform, and reaches the aim of defects' quantum and quality.From the results of the experiment, the system's structure is simple, the performance is...