Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1987-01-13
1989-02-07
Strecker, Gerald R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324202, 324226, 324227, 427 8, 364563, G01B 710, G01R 3312, G01N 2772
Patent
active
048034282
ABSTRACT:
A method and apparatus for the determination of thickness of plastic materials, as well as of bonding and coating materials, by high frequency electric and magnetic alternating fields. The method enables a simple test of components, as well as of coatings and bondings, even if the plastic parts to be tested or the coatings or bondings to be tested are not yet completely cured and the surfaces to be tested are located, so as to be concealed or are accessible only with difficulty. The method and apparatus consists in that electrically conductive or ferromagnetic particles are added to the materials to be measured and subsequently the electrical conductivity or magnetic permeability is measured at the completed or coated test specimen by high-frequency electrical and magnetic alternating fields, whose progression in space and time is adapted to the measuring task.
REFERENCES:
patent: 4530851 (1985-07-01), Shannon et al.
Snow Walter E.
Strecker Gerald R.
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