An image-based approach for Preisach function calculation

Abstract

This paper proposes an image-based calculation of Preisach function. The function is calculated from a series of distinct magnetized domain images. The domain images derive the state transition matrices from the image Helmholtz equation, which is a governing partial differential equation of digital dynamic images. It is described that the state transition matrix of the equation makes it possible to approximate the Preisach function. An intensive verification is carried out using scanning electron microscope domain images of a grain-oriented electrical steel. The magnetization curve reconstructed by means of the state transition matrices is shown to closely reproduce experimental result. Moreover, the state transition matrices reveal the iron loss generating parts on the target specimen.