Electronic – How do ultrasonic sensors differentiate between transmitted and received signals

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I understand how these ultrasonic sensors work on the basic level: They send out ultrasound, which is then reflected by an object and is then sensed by the receiver.

But the receiver and the transmitter are placed side by side. Won't the receiver immediately pick up the signal as it is sent? How does ignore the signal as it is sent, and record it only as it returns after being reflected by the target?

Best Answer

But the receiver and the transmitter are placed side by side. Won't the receiver immediately pick up the signal as it is sent? How does ignore the signal as it is sent, and record it only as it returns after being reflected by the target?

In a pulsed system (the most common type), the receiver is blanked during the period of the transmit pulse so it does not respond during that time.

This is the same in pulsed Sonar and Radar and determines the minimum distance that can be resolved.

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