Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1987-06-08
1989-09-26
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
264 401, 324231, 425169, 4251748R, G01B 710, B29C 4358
Patent
active
048703591
ABSTRACT:
A thickness measurement of non-metallic material molded bodies, particularly, walls of tubular ceramics or plastics, can be simply performed with a high precision, by interposing such a molded body between a metal and a measuring probe, such as a solenoid coil, generating an alternating magnetic field, and measuring an energy loss of the magnetic field which depends on the thickness of the molded body. The energy loss can be measured by detecting a variation of voltage of an A.C. bridge circuit including said coil as a component.
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"Ceramic Thickness Gage", Instruments, vol. 24, Jun. 1951, pp. 692 and 694.
NGK Insulators Ltd.
Strecker Gerard R.
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