Acoustic Clamp-on Liquid Level Detection in Case of Transducer Misalignment

The current contribution addresses the model-based compensation of transducer misalignment in case of non-invasive (clamp-on) fluid level detection applications, where a sensor position perpendicular to the surface cannot be granted. In the range of the beam spread, the angle of misalignment (also tilt angle in the following) can be identified and the sound propagation path and corresponding roundtrip time - used for level estimation - corrected by using a simple linear triangulation with at least three single transducers.