A virtual sing-around system with operating frequency of 2 MHz has been developed in the laboratory using PCL 812 data acquisition card along with IBM compatible PC using. The necessary circuit elements such as wide band amplifier, detector, pulse shaper etc. were designed using indigenous components. Powerful and effective data acquisition software at the back end has been written in “C” programming language that controls pulse generation, detection, re-triggering and travel time measurement. User friendly and interactive GUI screen has been designed in Visual Basic at the front end to accomplish the data acquisition, parameter setting, file manipulation, control and synchronization of the other functions involved in the measurements. Standard external quartz crystal oscillator of 32 MHz has been used to measure the travel time. Improved accuracy in travel time measurements has been obtained.
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