Turbulent Intensity (e) is an important parameter on fluid flowanalysis, because several physical phenomena are influenced by the parameter. As part of wind tunnelaerodynamic testing, LAGG has developed a measurement system for turbulent flow, namely softwaresystem for data acquisition and processing of ultrasonic velocimeter, DAQ controller and ultrasonictransducer. Although the system was developed for airflow, the system can also be used to measuregeneral fluid dynamic cases, liquid or gas (wind), open environment (atmospheric earth surface) or closeenvironment (pipe, channel or tunnel). The system development was carried out in LAGG MiniWindtunnel (LMW), supported by a software builder LABVIEW from National Instrument. Thefollowing paper describes a highlight of velocimetry basic theory, basic concept of software design, andits application to the measurement of flow characteristics.Keywords: turbulence, velocimetry, ultrasonic transducerFariduzzaman; UPT-LAGG BPPT, PUSPIPTEK Serpong, INDONESIA
