ABB Ultrasonic Sensors
ABB
Ultrasonic sensors operate in reflex mode. An ultrasonic transducer emits and receives the ultrasonic signala. Within a stipulated distance range, the incoming echo is checked, the time taken for the sound to travel the distance is determined and a corresponding output signal is emitted. If the distance between the sensor and the objects is too small, the echo arrives before the ultrasonic transducer has reached steady state and is ready to receive. Objects in this dead band cannot be detected reliably.
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