Analytical model of tilted driver–pickup coils for eddy current nondestructive evaluation
Cao Bing-Hua1, 2, Li Chao1, †, Fan Meng-Bao2, 3, Ye Bo4, Tian Gui-Yun5
       

Characterization of the angle β. (a) The angle φ. (b) The angle Φ. (c) The angle β.