The ultrasonic sensor works on the principle of SONAR and RADAR system which is used to determine the distance to an object.
An ultrasonic sensor uses a transducer to send and receive ultrasonic pulses that relay back information about an object’s proximity.
High-frequency sound waves reflect from boundaries to produce distinct echo patterns.
How it works?
Ultrasonic sensors work by emitting sound waves at a frequency too high for humans to hear. They then wait for the sound to be reflected back, calculating distance based on the time required.The transducer of the sensor acts as amicrophone to receive and send the ultrasonic sound. Our Ultrasonic Sensor, like many others, use a single transducer to send a pulse and to receive the echo. The sensor determines the distance to a target by measuring time lapses between the sending and receiving of the ultrasonic pulse.
The working principle of this module is simple. It sends an ultrasonic pulse out at 40kHz which travels through the air and if there is an obstacle or object, it will bounce back to the sensor. By calculating the travel time and the speed of sound, the distance can be calculated.
And on a final note Ultrasonic Sensor is used to measure time and based on that distance is calculated using the below formula.
Calculating distance: Distance = (time taken × speed of sound)/2