Sound energy pulse advances outward from the probe surface
With more than 20 different level measurement technologies on the market today, it is important to choose the right level transmitter for your process conditions. This article provides information on two of the most commonly used level measurement technologies—ultrasonic and guided-wave radar (GWR).
Here is a link to the Sensors Magazine Article:
Ultrasonic Transmitters vs. Guided-Wave Radar for Level Measurement