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 NXP Semiconductors


  • Ultrasonic Sensor

  • Created: Mar 02, 2014

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Summary

Ultrasonic sensors work on a principle similar to radar or sonar, which evaluate attributes of a target by interpreting the echoes from radio or sound waves respectively. Ultrasonic uses the sound waves, and Radar uses radio waves. Ultrasonic sensors generate high frequency sound waves and evaluate the echo, which is received back by the sensor. Sensors calculate the time interval between sending the signal and receiving the echo to determine the distance to an object. Ultrasonic waves detect an object in the same way as Radar does it.

The circuits uses a 74AHC02 NOR gate which is a high-speed Si-gate CMOS device and is pin compatible with Low-power Schottky TTL (LSTTL) and is specified in compliance with JEDEC standard No. 7-A. The systems typically use a transducer, which generates sound waves in the ultrasonic range, above 18,000 hertz, by turning electrical energy into sound, then upon receiving the echo turn the sound waves into electrical energy, which can be measured and displayed.


This technology can be used for measuring wind speed and direction (anemometer), tank or channel level, and speed through air or water. For measuring speed or direction a device uses multiple detectors and calculates the speed from the relative distances to particulates in the air or water. To measure tank or channel level, the sensor measures the distance to the surface of the fluid. Further applications include: humidifiers, sonar, medical ultrasonography, burglar alarms and non-destructive testing.

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