Improvement of measuring method of DC magnetization curve using ring specimen

When the dc magnetization (B-H) curve is measured using a ring specimen, the magnetic field strength corresponding to the average flux density should be calculated using the mean magnetic path length L_a. However, the mean geometric path length L_c is used instead of L_a, because L_a is unknown. Therefore, the B-H curve obtained has an error, and it is affected by the ratio γ of the outside to inside radii of the specimen. In this paper, a new measuring method of the accurate B-H curve using a ring specimen is proposed. The effectiveness of the method is verified by experiments.