Ultrasonic sensors briefly emit a large number of high-frequency sound waves. When the sound waves hit an object, the echo is reflected back to the sensor. The time it takes for the sound to travel to the object and back can be measured and converted into a distance threshold. This information can be used for position and level detection applications.
Ability to solve challenging applications
Both ultrasonic and photoelectric sensors can detect distant targets. Because they work by means of acoustic sensing, ultrasonic sensors are not affected by interference from light sources such as UV light or direct sunlight. Ultrasonic sensors can detect irregularly shaped objects, including objects with holes. They are particularly suitable for targets that can reflect sound waves, and are not affected by the target’s color, transparency, or surface reflectivity.
Suitable for a wide range of position applications
- Very suitable for detecting transparent objects, and for diffuse detection of long-range (up to 2.2 meters) targets (e.g., cars).
- Detecting full or empty loads in stacking height control applications.
- Detecting the position of material loops, thus allowing roller speed to be adjusted as needed based on non-contact web loop control.
- Determining when material is used up by detecting roller diameter; also suitable for press applications where photoelectric sensors have difficulty detecting reflective metal surfaces.
- Very suitable for level detection applications for liquids and materials with uneven surfaces (e.g., granulates and powders).
- Retro-reflective models detect objects regardless of their orientation.
- An excellent solution for dusty environments, because the vibrating sound transducer can reduce the accumulation of deposits.