Design of Electromagnetic Acoustic Data Acquisition and Analysis System Based on USB

Aiming at weakness and diversity characteristics of electromagnetic acoustic signals and demand of portable electromagnetic acoustic inspection system, an electromagnetic acoustic data acquisition and analysis system was designed. Data exchange between computer and acquisition circuits was realized through USB. Controls of electromagnetic acoustic transmit/receive circuits and acquisition of echo data were implemented utilizing FPGA. Software was developed by LabWindows CVI. Experiment showed that the system not only had comparatively high sampling rate and accuracy, but was also easy to use.