Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1987-04-20
1989-01-10
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324 62, 324158R, 324224, 331 65, 331 67, 331 70, 336 55, 336 84R, G01R 2700, G01N 2772, H03B 100, H01F 1504
Patent
active
047976144
ABSTRACT:
A meter for sheet conductance measurements does not touch the conductive surface of a sample. A probe having a resonant tank coil is positioned against a parallel supporting surface of the sample, which may be flat or curved and of unrestricted area. An oscillator incorporating the tank coil is controlled to stabilize oscillator amplitude in response to eddy current loading by the sample. An electrostatic shield in a finger configuration prevents capacitive coupling between the tank coil and the sample without hindering magnetic coupling. A readout of sheet conductance is driven by the oscillator control. Direct current can be coupled to the tank coil for temperature control preventing undesired resistance changes in the tank coil. The oscillator can be controlled by an optically coupled variable gain element. Measurements can be made with the tank coil up to at least 0.75 inch from the conductive surface of the sample.
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Sierracin Corporation
Strecker Gerard R.
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