An efficient calibration method for SQUID measurement system using three orthogonal Helmholtz coils
Li Hua1, 2, Zhang Shu-Lin1, †, , Zhang Chao-Xiang1, Kong Xiang-Yan1, Xie Xiao-Ming1
       

Relationship between orthogonal field B and non-orthogonal field B′. α is the angle between O′X′ and XOY; β is the angle between O′Y′ and OY; γ is the angle between O′X′ and YOZ.