What is the difference between contactless level measurement with radar and contactless level measurement with ultrasound?
Radar waves (electromagnetic waves) propagate without a supporting medium, i.e. they also travel in a vacuum! Therefore, the velocity of propagation is virtually unaffected by gases, no matter what their temperature or pressure. The measuring result is thus completely independent of these process factors! Ultrasonic waves need a medium to travel in, which is in most cases the surrounding air. The propagation velocity of the ultrasonic wave can vary greatly depending on the type of gas, as well as its temperature and pressure. The measuring result is thus directly dependent on these influencing factors!
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