Rotational speed measuring digital apparatus using a magnetic amorphous metallic glass as an induction coil

Abstract

We describe a rotational speed-measuring device that uses a coil of amorphous metallic glass magnetically coupled to a rotating element, to which a small magnet is attached. The coil is assembled by winding a tape of metglas 2605 SC and attaching to it connecting copper wires by means of silver paint. The output signal from the rotating element is processed and displayed in a liquid crystal display. Provision is also made to connect the signal to a computer.