T.O. 33B-1-14-13Figure 4-10. Relative Intensity of Eddy Currents with Variations in Lift-Off.4.2.2.2.4 FillFactor.When an encircling coil is used to inspect a cylindrically shaped part, the degree of magnetic coupling is dependentupon the difference between the internal diameter of the coil and the external diameter of the part. This effect istermed fill-factor (see Figure 4-11) and is designated by the ratio of the squares of the diameters as follows:Figure 4-11. Fill-Factor.
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