Verfahren zur Kalibrierung von Ultraschall-Clamp-on-Durchflussmessgeräten

摘要

A position difference is created by mutual translation of sound transducers and the associated time difference is measured. Radiating surfaces of both sound transducers are arranged acoustically opposing one another in planes that are parallel to one another. The sound transducers are positioned at a mutual distance x0+xd, and sound transit time t1 between the sound transducers is measured, wherein position x0 is the distance for optimum acoustic coupling of the two sound transducers and xd is the deviation from this position that is designated as the deviation. The sound transducers are repositioned at another mutual distance x0+xd+Deltax, and the sound transit time t2 between the sound transducers is measured. An acoustic calibration factor Ka is calculated from the distance difference Deltax and the time difference Deltat=t2-t1 using the formula Ka=Deltax/Deltat.