Ultrasonic waves are used for ultrasonic waves, and electromagnetic waves are used for radars. This is the biggest difference. Moreover, the penetration and directionality of ultrasonic waves are much stronger than those of electromagnetic waves, which is why ultrasonic detection is now more popular.
The difference between the main applications:
1. Ultrasonic accuracy is not as good as radar.
2. The relative price of the radar is higher.
3. When using radar, consider the dielectric constant of the medium.
4. Ultrasonic waves should not be used in vacuum, steam content is too high or there is foam in the liquid surface.
5. The radar measurement range is much larger than the ultrasonic wave.
6. The radar has a horn type, a rod type, and a cable type, and the relative ultrasonic wave can be applied to more complicated working conditions.