Ultrasonic sensor (Digital type)
An ultrasonic sensor mounted above the product is electrically excited and directs an
ultrasonic pulse through the air towards the product .This pulse is reflected
back from the surface of the product. The echoes partially reflected are detected by the same sensor,
now acting as receiver and converted back into an electrically
signal . The time taken between transmission and reception of the pulse the time of flight
is directly Proportional to the distance between the sensor and the product
surface .
Diagram of
ultrasonic:
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