Ultrasonic sensors

Ultrasonic sensors

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Ultrasonic sensors - non-contact inspection

Ultrasonic sensors are used for distance detection. Their role is to detect objects , measure distances and their positions. They can carry out level measurement for materials such as liquids, granules, powders and dusts, whether transparent, shiny or non-reflective. They are insensitive to the object's color and its structure. Ultrasonic sensors can be characterized as universal devices distinguished by reliable operation.

Non-contact object detection allows you to measure the fill level, height and overhang length without contact with the object. Additionally, ultrasonic sensors can count items and monitor their movement and presence.

Ultrasonic sensors are precise devices that work well in difficult conditions such as: dust, dirt, high temperatures or steam. High resolution and the small size of the blind zone allow for a high level of precision. They are used to detect objects or measure levels with an accuracy of a few millimeters.

Ultrasonic sensors - applications

Ultrasonic sensors are used in various fields of industrial automation. They provide non-contact detection of objects with the possibility of determining the absolute distance of the sensor from the object. These are universal devices that can be flexibly adapted to many applications in industry, they prove themselves in industries such as:

  1. machine, tool, construction industry,
  2. food and pharmaceutical industries,
  3. paper and wood industry, including furniture production,
  4. material handling,
  5. agriculture.

Ultrasonic sensors are used on a large scale in a variety of environments, especially where it is not possible to use optical sensors due to heavy contamination.

Principle of operation

The operation of the sensors is based on the measurement of the time between the transmitted ultrasonic signal and the received echo reflected from the obstacle. This time is proportional to the distance of the detected object. The principle of operation is non-contact detection of objects and measurement of their distance. The sensor emits ultrasonic pulses which are reflected by the object. The distance between it and the sensor may vary from a few centimeters to 10 meters.

The operation of ultrasonic sensors uses the principle of physics, which is the propagation of sound. The reflection that has been generated is picked up by an ultrasonic sensor and then converted into an electrical signal by a piezoelectric transducer. This phenomenon is called sound propagation. The sensor measures the delay between the emitted ultrasonic pulse and the received reflection. Then it calculates the distance to the object using the value of the speed of sound, which at room temperature is about 344 m / s

Ultrasonic sensors - advantages

The advantages of ultrasonic sensors include non-contact measurement , precision and high resolution. The high level of ultrasound frequency is also important, as well as the ability to perform measurements regardless of the type of material. The sensors are insensitive to surface properties , and strong reflections generated by transparent objects do not affect their operation. high pressure resistant

versions are produced

Device characteristics

The measuring ranges of ultrasonic sensors depend on the surface properties and the angle of the object. The optimal measuring range is possible in the case of objects with flat surfaces located at right angles to the sensor axis. Small objects or objects that reflect sound partially reduce the detection range. Objects with smooth surfaces should be positioned as close to the sensor as possible, at an angle of 90 °. Surfaces that have an uneven texture provide greater tolerance for object angle deviation.

Environmental conditions affect the accuracy of ultrasonic sensors measurements, with air temperature having the greatest impact. Ultrasonic sensors are of limited use in potentially explosive environments. Usually they work in such modes as: diffusion, reflection or push-pull.