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Eddy Current Depth of Penetration

Table 1

 

Table 1 Formulas used for determining the standard depth of penetration (ASNT, 1986)

	Hochschild (1959)	Libby (1971)	Hocking (1986)	Brown (1969)	PS 21207	ASM (1976)
		Franklin (1982)	MIL-STD-1537		MIL-STD-1537
Formula
	centimeters	meters	millimeters	inches	inches	inches
	3.14	3.14
	hertz	hertz	hertz	hertz	hertz	hertz
	% IACS	mhos per meter			% IACS
			1	1	1	1

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