Nondestructive Testing Technique For Determining Thickness Of A Ferromagnetic Material
Original Publication Date: 1979-Feb-01
Included in the Prior Art Database: 2005-Feb-19
The amount of a ferromagnetic material, such as electrolessly plated low phosphorus nickel, on a nonferromagnetic substrate, such as molybdenum pads on a multilayer ceramic module substrate, can be quickly and nondestructively determined by measuring the magnetic moment in a vibrating sample magnetometer. Sensing coils pick up the distortion of the magnetic field caused by vibrating the magnetic material in the field. The voltage induced in the coils is directly related to the magnetic moment of the sample.