induktiivandur

An induktiivandur, or inductive sensor, is a type of non-contact proximity sensor. It detects the presence of metallic objects without physical contact. The sensor operates by generating a high-frequency electromagnetic field from an oscillator. When a conductive target enters this field, it induces eddy currents in the target. These eddy currents then draw energy from the oscillator's magnetic field, causing a decrease in the oscillator's amplitude. This change in amplitude is detected by a detection circuit within the sensor, which then triggers an output signal.

Inductive sensors are widely used in automation and industrial applications due to their robustness and reliability. They are not affected by dust, dirt, oil, or water, making them suitable for harsh environments. They can detect a variety of metals, including ferrous and non-ferrous types, though their sensing range varies depending on the material being detected. The sensing range is typically shorter for non-ferrous metals compared to ferrous metals. Applications include object detection on conveyor belts, position sensing in machinery, and level detection in tanks. They come in various forms, including cylindrical, rectangular, and ring types, and can be shielded or unshielded. Shielded sensors can be mounted flush with metallic surfaces, while unshielded sensors require a surrounding air gap for optimal performance.