The video discusses a number of contactless level sensors and their working principle. The lecture has another part that focuses on contact-type level sensors and need for level measurement in general.
Part A Lecture 15 Contact-type Level Sensors | How they work! https://youtu.be/U1VTtqH7g1A
Part B Lecture 15 Contactless Level Sensors | How they work! https://youtu.be/ldDdd7d4Sys
Reference Video of Ultrasonic Range Sensors: https://youtu.be/KdviLusGF00
1- Ultrasonic Level Gauge 00:22
2- Radar (microwave) Level Sensor 04:04
3- Radiation-based Level Sensor 06:05
4- Laser-based Level Sensor 07:12
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