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Mon Aug 20 2018

Ultrasonic sensors

  • Ultrasonic sensors

Ultrasonic sensing – Versatile solutions for many applications

Ultrasonic sensors detect a multitude of objects contactless and wear-free with ultrasonic waves. In contrast to other sensing technologies, it is not important whether the object is transparent or opaque, metallic or non-metallic, firm, liquid or powdery. More important is the surface of the objects. The smoother the surface, the better the refl ectivity and the larger the range.

The application possibilities for ultrasonic sensors are nearly infi nite. Whether level or height detection, measurement of distance or object counting, ultrasonic sensors detect objects of diff erent material qualities and within a large range. Environmental conditions such as spray, dust or rain hardly aff ect their functionality.

Ultrasonic diffuse mode sensors detect all objects that echo back ultrasonic waves. For this purpose the sensor emits ultrasonic pulses in cyclic periods. The echo is reverberated and transformed into an electrical signal through the sensor‘s transducer. The distance between the sensor and object is determined through the echo propagation principle, whereby the period between pulse emission and reverberation is related to a given sonic speed.

Ultrasonic sensors are also available as opposed and diff mode devices. In opposed mode, ultrasonic waves are continuously propagating between emitter and receiver. If an object crosses the wave, reverberation is cut off and the sensor produces a switching signal.

TURCK‘s ultrasonic sensors are available in many diff erent designs, measuring ranges, beam angles and output types. Most of them feature temperature compensation, noise suppression and a connection cable for autosynchronization (protection against crosstalk).

Sensors with two switching outputs are suited for the control of minimum and maximum levels for example. Analog sensors are available with current and voltage output. Sensors with external transducer are best suited for confi ned spaces.

Small objects are detected with pinpoint accuracy, using versions with a narrow beam angle of approx. 6°. Devices with wider beam angle of 12° to 15° are also available. Sensors with a beam angle of 60° are best suited for monitoring very large areas. They detect smooth and even surfaces easily and are insensitive to tilt.