Seminar on Ultrasonic Level Sensor:
Ultrasonic Level Sensor is good seminar topic for Electronics Engineering:
- What is Sensor?
- Ultrasonic Level Sensor
- Construction.
- Working.
- Advantages.
- Limitations.
- Applications.
What is Sensor or Transducer:
Transducer is device which converts the mechanical signal to the electrical signal. Transducer includes various devices like LVDT, tachogenerator, RVDT etc.
Ultrasonic Level Sensor:
Ultrasonic Level Sensor is the device which is used to measure the level of matter in tank or similar. As name suggest, it uses the ultrasonic waves for this measurement.
Construction and Working of Ultrasonic Level Sensor :
Ultrasonic Level Sensor is consist of two main parts viz. transmitter and receiver. The assembly is placed on the tank in which level is to be measured. The transmitter directs the sound waves to the matter and those waves gets reflected back from its surface. Receiver receives the waves and counts down the time delay between the transmission and back receive. From this data and some standard data like speed of ultrasonic sound in the air it finds the distance of level of matter from the sensor.
This sensor provides very fast and reliable data output. Whole answer is mainly dependent upon time delay or lag. The ultrasonic sound is created by the Piezoelectric crystal inside the sensor. It converts electrical energy to ultrasonic sound energy.
Types of Ultrasonic Level Sensor:
1. Continuous Level Sensor:
Continuous Level Sensor can monitor continuously for change in level. In this the phase of emission of waves, their reception and calculation of level is ongoing process.
2. Point Level Sensor
Apart from continuous level sensor, Point level sensor is fire up type. It emits the sound, receives it and calculates the depth for one time. Its name can explain it.
Advantages:
- Non disturbing technique.
- Can be used for wide range of things like solid and liquids with wide range of viscosity.
- Low price.
- High functionality.
- Very accurate and low error.
- Long life instrument.
- Can measure the level of different liquids having different densities in same tank.
Limitations:
- Sensor mounting must be properly done.
- Tank should be free from obstacles otherwise it may cause error in measurement.
- Result may get affected due to change in temperature or pressure inside the tank or container.
Applications:
- Automatic pump control.
- Flow measurement.
- open channel flow measurement.
- Used in water/waste applications.
Kiran Pagar - Founder of Engiblogger. I get fascinated with Technology advances in world. I love to study and work with those technologies. I am Mechanical Engineer, my main interests are Animation, Software Development and Blogging. 
wow what a interesting post , its really helpful for us
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Great Info. Can you develop more information
Ultrasonic sensors are absolutely essential, when used for reversing, for organisations that use large, heavy vehicles. However, they are also very useful for smaller vehicles, though they can manage without them. In both cases, accidents are substantially reduced.