mätspole

A mätspole, often translated as a measuring coil or sense coil, is an electrical component used to detect changes in magnetic flux. It consists of a coil of wire, typically wound around a core material, though it can also be an air-cored coil. When a magnetic field passes through the coil and changes in strength or direction, it induces a voltage across the terminals of the mätspole. This induced voltage is directly proportional to the rate of change of the magnetic flux according to Faraday's law of induction.

Mätspolar are commonly employed in various sensing applications. They are fundamental to the operation of many types of magnetic sensors, such as those used for detecting the speed and position of rotating components in engines and industrial machinery. In some audio equipment, particularly older record players, a mätspole is part of the pickup cartridge, converting the variations in magnetic field caused by the stylus tracing a record groove into an electrical audio signal. They can also be found in non-destructive testing equipment to detect flaws or variations in metallic materials. The design and material of the core, along with the number of turns in the coil, are critical factors determining the sensitivity and frequency response of the mätspole.