Abstract:A measurement system for flow-induced noise based on LabVIEW is designed and applied in the test.The system can easily collect noise signal,and obtain the characteristic of noise.With the sensor ST70 measuring induced noise signal and being sent to applied modules to analyze frequency in virtual instrument modules,it can be used to understand the state of unit running.By comparing five flow mea-surements,it shows that signal′s time domain tends to fluctuated wave and its amplitude decreases as flow rate increase.Signals are almost constant at low frequency,but from 500 to 1 000 Hz,two obvious peaks appear and have little change.There is a trency which peaks from 1 000 to 2 000 Hz turns out as flow is growing.Signals by ST70 can represent the basic characteristics of flow-induced noise in test.The measurement system applied in time domain,frequency domain,band octave and so on can be satisfied to meet engineering and research needs in the future.
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