Figure 4-43. Phase Relationship Between Lift-Off and Crack Response for Various Materials and Frequencies

Figure 4-42. Decrease in Crack Response with Increasing Lift-Off

Figure 4-44. Lift-Off Resulting from Probe Wobble

TM-1-1500-335-23 Nondestructive Inspection Methods Manual
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T.O. 33B-1-1 4-54 Figure 4-43. Phase Relationship Between Lift-Off and Crack Response for Various Materials and Frequencies. 4.5.4.6 Probe Wobble. In performing manual eddy current inspection with a surface probe or pencil probe, it is usually impossible to maintain the probe at the same angle, with respect to the inspection surface, as position is changed. In some instances, holders may be fabricated to guide the probe and hold the angular relationship with the inspection surface. The angular change between the probe and the inspection surface is termed probe wobble. Probe wobble results in changes in lift-off as

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