Measuring High Frequency Valve Noise to Evaluate Interference with Ultrasonic Flow Meters

摘要

Ultrasonic flow meters are installed in lines with particular concern on the location of flow noisesources, such as valves and other geometry changes and restrictions in a piping system. Theultrasonic flow meter operates with a tone burst, typically in the range of 100 to 300 kHz. While,this frequency range is far above the typical range for noise control in piping systems, there isgood evidence that the flow noise sources generate sound in the operating frequency range of theultrasonic flow meter. The goal of the work was to establish a procedure to measure the noisegenerated by piping elements in the frequency range of the ultrasonic flow meter operation. Theflow disturbance is placed upstream of the ultrasonic flow meter. The internal noise spectrumare measured at three locations, one upstream of the flow disturbance, one between the flowdisturbance and the flow meter and one down stream of the flow meter. Some available resultsin the literature will be reviewed along with presenting the experimental setup and preliminaryresults. The results will show the capabilities of the measurements in this frequency range.