Ultrasonic Sensor-Electronics Seminar Topic:
Seminar on Ultrasonic Devices need Following Things.

What is Sensor?
Ultrasonic Waves?
Properties.
Principle and Working of Ultrasonic Devices.
Applications.
Explanation of some applications.

Some applications of Ultrasonics are as Below:

Ultrasonic Level Sensor.
Ultrasonic Distance Sensor.
Ultrasonic Flow Meters.

Sensors:
Sensor is Transducer Device which can sense the change in Pressure, Temperature etc. physical Quantities and turn them into readable digital or analogue [...]

Ultrasonic Flowmeters:
Already we have seen some of the ultrasonic devices before like Ultrasonic Level Sensor and Ultrasonic Distance Sensing. Now, I am going to explain one more ultrasonic device here. Ultrasonic Flow-meters are used to detect the speed of flow or subsequently quantity passed through the flow in given time.
Types of Ultrasonic Flowmeter:

Transit Time Type.
Doppler [...]