A design for a yoke to detect a notch on edge by using magnetic flux leakage methodH. Heidary, M. A. Mehrpouya, A. Ghalee and A. R. OskoueiEur. Phys. J. Plus, 136 4 (2021) 368DOI: https://doi.org/10.1140/epjp/s13360-021-01364-5