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Ultrasonic Sensors, The Silent Laborers

From Baumer Ltd.

During operation the transducer alternates continuously between transmitting and receiving. If the transmitted switch packets encounter an object the sound is reflected and a small part of the energy is reflected back to the sensor, respectively the transducer. The output of the sensor reacts after registering a certain number of successive signals within the time frame selected by the user. If the sensor is however already back to transmitting, the reflected signal arrives too late and can therefore no longer be received and evaluated. The object remains unrecognized. It is located too far away, outside the set detection range; in this particular instance the delay time "sensor - object - sensor" was too long. As a result ultrasonic sensors are also excellent background fade-out units; in addition - if compared to other optical units with comparable characteristics - they are not easily influenced by shining and reflective objects located behind them.
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